./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/Problem05_label45+token_ring.04.cil-1.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_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/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_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/Problem05_label45+token_ring.04.cil-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/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_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/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 c77578a373441dc4befdd6b2c62472e20adb967aa702c242a875876828ccf992 --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-12-02 14:13:18,938 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-12-02 14:13:19,001 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-12-02 14:13:19,006 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-12-02 14:13:19,007 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-12-02 14:13:19,030 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-12-02 14:13:19,030 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-12-02 14:13:19,031 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-12-02 14:13:19,031 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-12-02 14:13:19,032 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-12-02 14:13:19,032 INFO L153 SettingsManager]: * User list type=DISABLED [2023-12-02 14:13:19,033 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-12-02 14:13:19,033 INFO L153 SettingsManager]: * Explicit value domain=true [2023-12-02 14:13:19,034 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-12-02 14:13:19,034 INFO L153 SettingsManager]: * Octagon Domain=false [2023-12-02 14:13:19,035 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-12-02 14:13:19,035 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-12-02 14:13:19,036 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-12-02 14:13:19,036 INFO L153 SettingsManager]: * Interval Domain=false [2023-12-02 14:13:19,037 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-12-02 14:13:19,037 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-12-02 14:13:19,040 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-12-02 14:13:19,041 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-12-02 14:13:19,042 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-12-02 14:13:19,042 INFO L153 SettingsManager]: * sizeof long=4 [2023-12-02 14:13:19,042 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-12-02 14:13:19,043 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-12-02 14:13:19,043 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-12-02 14:13:19,043 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-12-02 14:13:19,044 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-12-02 14:13:19,044 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-12-02 14:13:19,044 INFO L153 SettingsManager]: * sizeof long double=12 [2023-12-02 14:13:19,045 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-12-02 14:13:19,045 INFO L153 SettingsManager]: * Use constant arrays=true [2023-12-02 14:13:19,045 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-12-02 14:13:19,045 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-12-02 14:13:19,046 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-12-02 14:13:19,046 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 14:13:19,046 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-12-02 14:13:19,046 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-12-02 14:13:19,046 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-12-02 14:13:19,047 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-12-02 14:13:19,047 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-12-02 14:13:19,047 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-12-02 14:13:19,047 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-12-02 14:13:19,048 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-12-02 14:13:19,048 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-12-02 14:13:19,048 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_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> c77578a373441dc4befdd6b2c62472e20adb967aa702c242a875876828ccf992 [2023-12-02 14:13:19,258 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-12-02 14:13:19,280 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-12-02 14:13:19,283 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-12-02 14:13:19,284 INFO L270 PluginConnector]: Initializing CDTParser... [2023-12-02 14:13:19,285 INFO L274 PluginConnector]: CDTParser initialized [2023-12-02 14:13:19,286 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/../../sv-benchmarks/c/combinations/Problem05_label45+token_ring.04.cil-1.c [2023-12-02 14:13:22,029 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-12-02 14:13:22,577 INFO L384 CDTParser]: Found 1 translation units. [2023-12-02 14:13:22,578 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/sv-benchmarks/c/combinations/Problem05_label45+token_ring.04.cil-1.c [2023-12-02 14:13:22,650 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/data/5bdbfac71/6044366a96ba4aba8115a8cc854bfff1/FLAG80b749940 [2023-12-02 14:13:22,664 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/data/5bdbfac71/6044366a96ba4aba8115a8cc854bfff1 [2023-12-02 14:13:22,667 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-12-02 14:13:22,668 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-12-02 14:13:22,669 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-12-02 14:13:22,670 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-12-02 14:13:22,674 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-12-02 14:13:22,675 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 02:13:22" (1/1) ... [2023-12-02 14:13:22,676 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@29c3b90a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:13:22, skipping insertion in model container [2023-12-02 14:13:22,676 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 02:13:22" (1/1) ... [2023-12-02 14:13:22,947 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-12-02 14:13:24,788 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_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/sv-benchmarks/c/combinations/Problem05_label45+token_ring.04.cil-1.c[380323,380336] [2023-12-02 14:13:24,812 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_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/sv-benchmarks/c/combinations/Problem05_label45+token_ring.04.cil-1.c[383339,383352] [2023-12-02 14:13:24,987 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 14:13:24,996 INFO L202 MainTranslator]: Completed pre-run [2023-12-02 14:13:25,937 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_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/sv-benchmarks/c/combinations/Problem05_label45+token_ring.04.cil-1.c[380323,380336] [2023-12-02 14:13:25,942 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_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/sv-benchmarks/c/combinations/Problem05_label45+token_ring.04.cil-1.c[383339,383352] [2023-12-02 14:13:25,957 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 14:13:26,015 INFO L206 MainTranslator]: Completed translation [2023-12-02 14:13:26,016 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:13:26 WrapperNode [2023-12-02 14:13:26,016 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-12-02 14:13:26,017 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-12-02 14:13:26,017 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-12-02 14:13:26,017 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-12-02 14:13:26,023 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:13:26" (1/1) ... [2023-12-02 14:13:26,101 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:13:26" (1/1) ... [2023-12-02 14:13:26,432 INFO L138 Inliner]: procedures = 52, calls = 53, calls flagged for inlining = 30, calls inlined = 30, statements flattened = 12748 [2023-12-02 14:13:26,432 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-12-02 14:13:26,433 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-12-02 14:13:26,433 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-12-02 14:13:26,433 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-12-02 14:13:26,443 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:13:26" (1/1) ... [2023-12-02 14:13:26,443 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:13:26" (1/1) ... [2023-12-02 14:13:26,486 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:13:26" (1/1) ... [2023-12-02 14:13:26,487 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:13:26" (1/1) ... [2023-12-02 14:13:26,678 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:13:26" (1/1) ... [2023-12-02 14:13:26,738 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:13:26" (1/1) ... [2023-12-02 14:13:26,764 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:13:26" (1/1) ... [2023-12-02 14:13:26,791 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:13:26" (1/1) ... [2023-12-02 14:13:26,870 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-12-02 14:13:26,871 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-12-02 14:13:26,872 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-12-02 14:13:26,872 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-12-02 14:13:26,873 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:13:26" (1/1) ... [2023-12-02 14:13:26,879 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 14:13:26,891 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:13:26,918 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-12-02 14:13:26,949 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-12-02 14:13:26,978 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-12-02 14:13:26,980 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2023-12-02 14:13:26,981 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2023-12-02 14:13:26,981 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2023-12-02 14:13:26,981 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2023-12-02 14:13:26,981 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2023-12-02 14:13:26,981 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2023-12-02 14:13:26,982 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2023-12-02 14:13:26,982 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2023-12-02 14:13:26,982 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2023-12-02 14:13:26,982 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2023-12-02 14:13:26,983 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2023-12-02 14:13:26,983 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2023-12-02 14:13:26,983 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-12-02 14:13:26,984 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-12-02 14:13:26,984 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-12-02 14:13:27,130 INFO L241 CfgBuilder]: Building ICFG [2023-12-02 14:13:27,133 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-12-02 14:13:34,939 INFO L282 CfgBuilder]: Performing block encoding [2023-12-02 14:13:36,636 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-12-02 14:13:36,636 INFO L309 CfgBuilder]: Removed 8 assume(true) statements. [2023-12-02 14:13:36,639 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 02:13:36 BoogieIcfgContainer [2023-12-02 14:13:36,639 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-12-02 14:13:36,642 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-12-02 14:13:36,642 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-12-02 14:13:36,645 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-12-02 14:13:36,646 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.12 02:13:22" (1/3) ... [2023-12-02 14:13:36,647 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@41f11cfa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 02:13:36, skipping insertion in model container [2023-12-02 14:13:36,647 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:13:26" (2/3) ... [2023-12-02 14:13:36,647 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@41f11cfa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 02:13:36, skipping insertion in model container [2023-12-02 14:13:36,647 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 02:13:36" (3/3) ... [2023-12-02 14:13:36,649 INFO L112 eAbstractionObserver]: Analyzing ICFG Problem05_label45+token_ring.04.cil-1.c [2023-12-02 14:13:36,665 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-12-02 14:13:36,665 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2023-12-02 14:13:36,749 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-12-02 14:13:36,756 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;@29100d1e, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-12-02 14:13:36,756 INFO L358 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2023-12-02 14:13:36,768 INFO L276 IsEmpty]: Start isEmpty. Operand has 1748 states, 1721 states have (on average 1.9697850087158628) internal successors, (3390), 1724 states have internal predecessors, (3390), 18 states have call successors, (18), 6 states have call predecessors, (18), 6 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) [2023-12-02 14:13:36,777 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2023-12-02 14:13:36,778 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:13:36,778 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 14:13:36,779 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:13:36,782 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:13:36,782 INFO L85 PathProgramCache]: Analyzing trace with hash -266854268, now seen corresponding path program 1 times [2023-12-02 14:13:36,792 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:13:36,792 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [294633018] [2023-12-02 14:13:36,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:13:36,793 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:13:36,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:13:37,184 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 14:13:37,185 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:13:37,185 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [294633018] [2023-12-02 14:13:37,186 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [294633018] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:13:37,186 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 14:13:37,187 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-12-02 14:13:37,188 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1292115012] [2023-12-02 14:13:37,189 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:13:37,193 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 14:13:37,194 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:13:37,224 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 14:13:37,225 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 14:13:37,232 INFO L87 Difference]: Start difference. First operand has 1748 states, 1721 states have (on average 1.9697850087158628) internal successors, (3390), 1724 states have internal predecessors, (3390), 18 states have call successors, (18), 6 states have call predecessors, (18), 6 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) Second operand has 4 states, 4 states have (on average 8.25) internal successors, (33), 4 states have internal predecessors, (33), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2023-12-02 14:13:38,101 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:13:38,101 INFO L93 Difference]: Finished difference Result 3584 states and 6994 transitions. [2023-12-02 14:13:38,102 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 14:13:38,104 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 8.25) internal successors, (33), 4 states have internal predecessors, (33), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 43 [2023-12-02 14:13:38,104 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:13:38,130 INFO L225 Difference]: With dead ends: 3584 [2023-12-02 14:13:38,131 INFO L226 Difference]: Without dead ends: 1835 [2023-12-02 14:13:38,139 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 14:13:38,143 INFO L413 NwaCegarLoop]: 3281 mSDtfsCounter, 3525 mSDsluCounter, 3215 mSDsCounter, 0 mSdLazyCounter, 598 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3525 SdHoareTripleChecker+Valid, 6496 SdHoareTripleChecker+Invalid, 612 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 598 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-12-02 14:13:38,144 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3525 Valid, 6496 Invalid, 612 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [14 Valid, 598 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-12-02 14:13:38,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1835 states. [2023-12-02 14:13:38,268 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1835 to 1834. [2023-12-02 14:13:38,274 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1834 states, 1788 states have (on average 1.9429530201342282) internal successors, (3474), 1791 states have internal predecessors, (3474), 32 states have call successors, (32), 12 states have call predecessors, (32), 12 states have return successors, (32), 31 states have call predecessors, (32), 32 states have call successors, (32) [2023-12-02 14:13:38,288 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1834 states to 1834 states and 3538 transitions. [2023-12-02 14:13:38,290 INFO L78 Accepts]: Start accepts. Automaton has 1834 states and 3538 transitions. Word has length 43 [2023-12-02 14:13:38,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:13:38,291 INFO L495 AbstractCegarLoop]: Abstraction has 1834 states and 3538 transitions. [2023-12-02 14:13:38,291 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 8.25) internal successors, (33), 4 states have internal predecessors, (33), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2023-12-02 14:13:38,291 INFO L276 IsEmpty]: Start isEmpty. Operand 1834 states and 3538 transitions. [2023-12-02 14:13:38,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2023-12-02 14:13:38,297 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:13:38,298 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:13:38,298 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-12-02 14:13:38,298 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:13:38,299 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:13:38,299 INFO L85 PathProgramCache]: Analyzing trace with hash -1720318814, now seen corresponding path program 1 times [2023-12-02 14:13:38,300 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:13:38,300 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1414415527] [2023-12-02 14:13:38,300 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:13:38,301 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:13:38,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:13:38,524 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-12-02 14:13:38,525 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:13:38,525 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1414415527] [2023-12-02 14:13:38,525 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1414415527] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:13:38,526 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1110004796] [2023-12-02 14:13:38,526 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:13:38,526 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:13:38,526 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:13:38,528 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:13:38,538 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-12-02 14:13:38,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:13:38,691 INFO L262 TraceCheckSpWp]: Trace formula consists of 483 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 14:13:38,700 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:13:38,759 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-12-02 14:13:38,760 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 14:13:38,760 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1110004796] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:13:38,760 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 14:13:38,761 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-12-02 14:13:38,761 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2039585747] [2023-12-02 14:13:38,762 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:13:38,763 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 14:13:38,763 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:13:38,764 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 14:13:38,764 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 14:13:38,764 INFO L87 Difference]: Start difference. First operand 1834 states and 3538 transitions. Second operand has 3 states, 3 states have (on average 18.0) internal successors, (54), 2 states have internal predecessors, (54), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-12-02 14:13:39,244 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:13:39,245 INFO L93 Difference]: Finished difference Result 2203 states and 4065 transitions. [2023-12-02 14:13:39,245 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 14:13:39,246 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 2 states have internal predecessors, (54), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 81 [2023-12-02 14:13:39,246 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:13:39,259 INFO L225 Difference]: With dead ends: 2203 [2023-12-02 14:13:39,260 INFO L226 Difference]: Without dead ends: 2015 [2023-12-02 14:13:39,261 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 81 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 14:13:39,263 INFO L413 NwaCegarLoop]: 3211 mSDtfsCounter, 3386 mSDsluCounter, 110 mSDsCounter, 0 mSdLazyCounter, 268 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3386 SdHoareTripleChecker+Valid, 3321 SdHoareTripleChecker+Invalid, 270 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 268 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 14:13:39,263 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3386 Valid, 3321 Invalid, 270 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 268 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 14:13:39,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2015 states. [2023-12-02 14:13:39,319 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2015 to 2011. [2023-12-02 14:13:39,323 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2011 states, 1927 states have (on average 1.9019200830306175) internal successors, (3665), 1931 states have internal predecessors, (3665), 58 states have call successors, (58), 24 states have call predecessors, (58), 24 states have return successors, (58), 56 states have call predecessors, (58), 58 states have call successors, (58) [2023-12-02 14:13:39,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2011 states to 2011 states and 3781 transitions. [2023-12-02 14:13:39,334 INFO L78 Accepts]: Start accepts. Automaton has 2011 states and 3781 transitions. Word has length 81 [2023-12-02 14:13:39,334 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:13:39,334 INFO L495 AbstractCegarLoop]: Abstraction has 2011 states and 3781 transitions. [2023-12-02 14:13:39,334 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 2 states have internal predecessors, (54), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-12-02 14:13:39,335 INFO L276 IsEmpty]: Start isEmpty. Operand 2011 states and 3781 transitions. [2023-12-02 14:13:39,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2023-12-02 14:13:39,339 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:13:39,339 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:13:39,346 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-12-02 14:13:39,540 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2023-12-02 14:13:39,541 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:13:39,541 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:13:39,542 INFO L85 PathProgramCache]: Analyzing trace with hash -1000225662, now seen corresponding path program 1 times [2023-12-02 14:13:39,542 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:13:39,542 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1343664825] [2023-12-02 14:13:39,542 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:13:39,542 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:13:39,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:13:39,711 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-12-02 14:13:39,711 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:13:39,712 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1343664825] [2023-12-02 14:13:39,712 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1343664825] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:13:39,712 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [857928823] [2023-12-02 14:13:39,712 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:13:39,713 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:13:39,713 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:13:39,715 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:13:39,721 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-12-02 14:13:39,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:13:39,865 INFO L262 TraceCheckSpWp]: Trace formula consists of 477 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 14:13:39,869 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:13:39,910 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-12-02 14:13:39,910 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 14:13:39,910 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [857928823] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:13:39,910 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 14:13:39,911 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-12-02 14:13:39,911 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [953173008] [2023-12-02 14:13:39,911 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:13:39,912 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 14:13:39,912 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:13:39,913 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 14:13:39,913 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 14:13:39,913 INFO L87 Difference]: Start difference. First operand 2011 states and 3781 transitions. Second operand has 3 states, 3 states have (on average 17.0) internal successors, (51), 2 states have internal predecessors, (51), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-12-02 14:13:40,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:13:40,355 INFO L93 Difference]: Finished difference Result 2728 states and 4796 transitions. [2023-12-02 14:13:40,355 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 14:13:40,355 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.0) internal successors, (51), 2 states have internal predecessors, (51), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 81 [2023-12-02 14:13:40,355 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:13:40,368 INFO L225 Difference]: With dead ends: 2728 [2023-12-02 14:13:40,368 INFO L226 Difference]: Without dead ends: 2363 [2023-12-02 14:13:40,370 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 81 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 14:13:40,371 INFO L413 NwaCegarLoop]: 3209 mSDtfsCounter, 3389 mSDsluCounter, 110 mSDsCounter, 0 mSdLazyCounter, 268 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3389 SdHoareTripleChecker+Valid, 3319 SdHoareTripleChecker+Invalid, 270 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 268 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 14:13:40,372 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3389 Valid, 3319 Invalid, 270 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 268 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 14:13:40,376 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2363 states. [2023-12-02 14:13:40,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2363 to 2357. [2023-12-02 14:13:40,430 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2357 states, 2199 states have (on average 1.834924965893588) internal successors, (4035), 2205 states have internal predecessors, (4035), 108 states have call successors, (108), 48 states have call predecessors, (108), 48 states have return successors, (108), 104 states have call predecessors, (108), 108 states have call successors, (108) [2023-12-02 14:13:40,438 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2357 states to 2357 states and 4251 transitions. [2023-12-02 14:13:40,438 INFO L78 Accepts]: Start accepts. Automaton has 2357 states and 4251 transitions. Word has length 81 [2023-12-02 14:13:40,439 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:13:40,439 INFO L495 AbstractCegarLoop]: Abstraction has 2357 states and 4251 transitions. [2023-12-02 14:13:40,439 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.0) internal successors, (51), 2 states have internal predecessors, (51), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-12-02 14:13:40,439 INFO L276 IsEmpty]: Start isEmpty. Operand 2357 states and 4251 transitions. [2023-12-02 14:13:40,442 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2023-12-02 14:13:40,442 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:13:40,442 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:13:40,447 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-12-02 14:13:40,643 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:13:40,643 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:13:40,644 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:13:40,644 INFO L85 PathProgramCache]: Analyzing trace with hash -2066777950, now seen corresponding path program 1 times [2023-12-02 14:13:40,644 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:13:40,644 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2085843538] [2023-12-02 14:13:40,644 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:13:40,644 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:13:40,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:13:40,738 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2023-12-02 14:13:40,738 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:13:40,738 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2085843538] [2023-12-02 14:13:40,738 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2085843538] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:13:40,738 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 14:13:40,739 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 14:13:40,739 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1833665406] [2023-12-02 14:13:40,739 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:13:40,739 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 14:13:40,740 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:13:40,740 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 14:13:40,740 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 14:13:40,741 INFO L87 Difference]: Start difference. First operand 2357 states and 4251 transitions. Second operand has 3 states, 3 states have (on average 16.0) internal successors, (48), 3 states have internal predecessors, (48), 2 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2023-12-02 14:13:41,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:13:41,228 INFO L93 Difference]: Finished difference Result 2919 states and 5040 transitions. [2023-12-02 14:13:41,229 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 14:13:41,229 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 16.0) internal successors, (48), 3 states have internal predecessors, (48), 2 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 81 [2023-12-02 14:13:41,230 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:13:41,246 INFO L225 Difference]: With dead ends: 2919 [2023-12-02 14:13:41,246 INFO L226 Difference]: Without dead ends: 2553 [2023-12-02 14:13:41,249 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 14:13:41,250 INFO L413 NwaCegarLoop]: 3238 mSDtfsCounter, 59 mSDsluCounter, 3179 mSDsCounter, 0 mSdLazyCounter, 488 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 6417 SdHoareTripleChecker+Invalid, 488 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 488 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 14:13:41,250 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [59 Valid, 6417 Invalid, 488 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 488 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 14:13:41,255 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2553 states. [2023-12-02 14:13:41,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2553 to 2481. [2023-12-02 14:13:41,335 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2481 states, 2315 states have (on average 1.8207343412526997) internal successors, (4215), 2321 states have internal predecessors, (4215), 112 states have call successors, (112), 52 states have call predecessors, (112), 52 states have return successors, (112), 108 states have call predecessors, (112), 112 states have call successors, (112) [2023-12-02 14:13:41,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2481 states to 2481 states and 4439 transitions. [2023-12-02 14:13:41,346 INFO L78 Accepts]: Start accepts. Automaton has 2481 states and 4439 transitions. Word has length 81 [2023-12-02 14:13:41,347 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:13:41,347 INFO L495 AbstractCegarLoop]: Abstraction has 2481 states and 4439 transitions. [2023-12-02 14:13:41,347 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 16.0) internal successors, (48), 3 states have internal predecessors, (48), 2 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2023-12-02 14:13:41,347 INFO L276 IsEmpty]: Start isEmpty. Operand 2481 states and 4439 transitions. [2023-12-02 14:13:41,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2023-12-02 14:13:41,352 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:13:41,352 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 14:13:41,352 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-12-02 14:13:41,353 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:13:41,353 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:13:41,353 INFO L85 PathProgramCache]: Analyzing trace with hash -93550009, now seen corresponding path program 1 times [2023-12-02 14:13:41,353 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:13:41,353 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [723042457] [2023-12-02 14:13:41,354 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:13:41,354 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:13:41,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:13:41,436 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2023-12-02 14:13:41,436 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:13:41,437 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [723042457] [2023-12-02 14:13:41,437 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [723042457] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:13:41,437 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 14:13:41,437 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 14:13:41,437 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1037213576] [2023-12-02 14:13:41,437 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:13:41,438 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 14:13:41,438 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:13:41,439 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 14:13:41,439 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 14:13:41,439 INFO L87 Difference]: Start difference. First operand 2481 states and 4439 transitions. Second operand has 3 states, 3 states have (on average 18.666666666666668) internal successors, (56), 3 states have internal predecessors, (56), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 14:13:41,878 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:13:41,878 INFO L93 Difference]: Finished difference Result 4114 states and 6748 transitions. [2023-12-02 14:13:41,879 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 14:13:41,879 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.666666666666668) internal successors, (56), 3 states have internal predecessors, (56), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 108 [2023-12-02 14:13:41,879 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:13:41,900 INFO L225 Difference]: With dead ends: 4114 [2023-12-02 14:13:41,900 INFO L226 Difference]: Without dead ends: 3279 [2023-12-02 14:13:41,904 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 14:13:41,905 INFO L413 NwaCegarLoop]: 3181 mSDtfsCounter, 3379 mSDsluCounter, 110 mSDsCounter, 0 mSdLazyCounter, 263 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3379 SdHoareTripleChecker+Valid, 3291 SdHoareTripleChecker+Invalid, 265 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 263 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 14:13:41,906 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3379 Valid, 3291 Invalid, 265 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 263 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 14:13:41,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3279 states. [2023-12-02 14:13:42,062 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3279 to 3265. [2023-12-02 14:13:42,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3265 states, 2947 states have (on average 1.7234475738038684) internal successors, (5079), 2957 states have internal predecessors, (5079), 212 states have call successors, (212), 104 states have call predecessors, (212), 104 states have return successors, (212), 204 states have call predecessors, (212), 212 states have call successors, (212) [2023-12-02 14:13:42,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3265 states to 3265 states and 5503 transitions. [2023-12-02 14:13:42,079 INFO L78 Accepts]: Start accepts. Automaton has 3265 states and 5503 transitions. Word has length 108 [2023-12-02 14:13:42,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:13:42,079 INFO L495 AbstractCegarLoop]: Abstraction has 3265 states and 5503 transitions. [2023-12-02 14:13:42,080 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.666666666666668) internal successors, (56), 3 states have internal predecessors, (56), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 14:13:42,080 INFO L276 IsEmpty]: Start isEmpty. Operand 3265 states and 5503 transitions. [2023-12-02 14:13:42,086 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2023-12-02 14:13:42,086 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:13:42,086 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 14:13:42,087 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-12-02 14:13:42,087 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:13:42,087 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:13:42,087 INFO L85 PathProgramCache]: Analyzing trace with hash 1615666304, now seen corresponding path program 1 times [2023-12-02 14:13:42,087 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:13:42,087 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [908862676] [2023-12-02 14:13:42,087 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:13:42,088 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:13:42,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:13:42,143 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2023-12-02 14:13:42,143 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:13:42,143 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [908862676] [2023-12-02 14:13:42,143 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [908862676] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:13:42,144 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 14:13:42,144 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 14:13:42,144 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1734437550] [2023-12-02 14:13:42,144 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:13:42,144 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 14:13:42,144 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:13:42,145 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 14:13:42,145 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 14:13:42,145 INFO L87 Difference]: Start difference. First operand 3265 states and 5503 transitions. Second operand has 3 states, 3 states have (on average 18.666666666666668) internal successors, (56), 3 states have internal predecessors, (56), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 14:13:42,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:13:42,602 INFO L93 Difference]: Finished difference Result 6430 states and 9916 transitions. [2023-12-02 14:13:42,603 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 14:13:42,603 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.666666666666668) internal successors, (56), 3 states have internal predecessors, (56), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 108 [2023-12-02 14:13:42,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:13:42,628 INFO L225 Difference]: With dead ends: 6430 [2023-12-02 14:13:42,628 INFO L226 Difference]: Without dead ends: 4811 [2023-12-02 14:13:42,633 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 14:13:42,634 INFO L413 NwaCegarLoop]: 3179 mSDtfsCounter, 3382 mSDsluCounter, 110 mSDsCounter, 0 mSdLazyCounter, 263 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3382 SdHoareTripleChecker+Valid, 3289 SdHoareTripleChecker+Invalid, 265 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 263 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 14:13:42,635 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3382 Valid, 3289 Invalid, 265 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 263 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 14:13:42,641 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4811 states. [2023-12-02 14:13:42,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4811 to 4785. [2023-12-02 14:13:42,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4785 states, 4171 states have (on average 1.6128026852073842) internal successors, (6727), 4189 states have internal predecessors, (6727), 404 states have call successors, (404), 208 states have call predecessors, (404), 208 states have return successors, (404), 388 states have call predecessors, (404), 404 states have call successors, (404) [2023-12-02 14:13:42,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4785 states to 4785 states and 7535 transitions. [2023-12-02 14:13:42,771 INFO L78 Accepts]: Start accepts. Automaton has 4785 states and 7535 transitions. Word has length 108 [2023-12-02 14:13:42,771 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:13:42,771 INFO L495 AbstractCegarLoop]: Abstraction has 4785 states and 7535 transitions. [2023-12-02 14:13:42,772 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.666666666666668) internal successors, (56), 3 states have internal predecessors, (56), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 14:13:42,772 INFO L276 IsEmpty]: Start isEmpty. Operand 4785 states and 7535 transitions. [2023-12-02 14:13:42,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2023-12-02 14:13:42,780 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:13:42,780 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:13:42,781 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-12-02 14:13:42,781 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:13:42,781 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:13:42,781 INFO L85 PathProgramCache]: Analyzing trace with hash 1057334691, now seen corresponding path program 1 times [2023-12-02 14:13:42,782 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:13:42,782 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [432077046] [2023-12-02 14:13:42,782 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:13:42,782 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:13:42,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:13:42,880 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 23 proven. 2 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2023-12-02 14:13:42,880 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:13:42,881 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [432077046] [2023-12-02 14:13:42,881 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [432077046] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:13:42,881 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [357973189] [2023-12-02 14:13:42,881 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:13:42,881 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:13:42,881 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:13:42,884 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:13:42,888 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-12-02 14:13:43,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:13:43,041 INFO L262 TraceCheckSpWp]: Trace formula consists of 625 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 14:13:43,046 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:13:43,074 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 64 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2023-12-02 14:13:43,074 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 14:13:43,074 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [357973189] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:13:43,074 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 14:13:43,075 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2023-12-02 14:13:43,075 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1091242654] [2023-12-02 14:13:43,075 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:13:43,076 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 14:13:43,076 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:13:43,076 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 14:13:43,076 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-12-02 14:13:43,077 INFO L87 Difference]: Start difference. First operand 4785 states and 7535 transitions. Second operand has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 3 states have internal predecessors, (85), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 14:13:43,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:13:43,607 INFO L93 Difference]: Finished difference Result 7453 states and 11241 transitions. [2023-12-02 14:13:43,607 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 14:13:43,607 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 3 states have internal predecessors, (85), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 123 [2023-12-02 14:13:43,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:13:43,644 INFO L225 Difference]: With dead ends: 7453 [2023-12-02 14:13:43,644 INFO L226 Difference]: Without dead ends: 5847 [2023-12-02 14:13:43,651 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-12-02 14:13:43,652 INFO L413 NwaCegarLoop]: 3239 mSDtfsCounter, 72 mSDsluCounter, 3178 mSDsCounter, 0 mSdLazyCounter, 488 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 6417 SdHoareTripleChecker+Invalid, 488 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 488 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 14:13:43,652 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [72 Valid, 6417 Invalid, 488 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 488 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 14:13:43,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5847 states. [2023-12-02 14:13:43,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5847 to 5405. [2023-12-02 14:13:43,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5405 states, 4743 states have (on average 1.5987771452667088) internal successors, (7583), 4761 states have internal predecessors, (7583), 428 states have call successors, (428), 232 states have call predecessors, (428), 232 states have return successors, (428), 412 states have call predecessors, (428), 428 states have call successors, (428) [2023-12-02 14:13:43,877 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5405 states to 5405 states and 8439 transitions. [2023-12-02 14:13:43,878 INFO L78 Accepts]: Start accepts. Automaton has 5405 states and 8439 transitions. Word has length 123 [2023-12-02 14:13:43,878 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:13:43,878 INFO L495 AbstractCegarLoop]: Abstraction has 5405 states and 8439 transitions. [2023-12-02 14:13:43,879 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 3 states have internal predecessors, (85), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 14:13:43,879 INFO L276 IsEmpty]: Start isEmpty. Operand 5405 states and 8439 transitions. [2023-12-02 14:13:43,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2023-12-02 14:13:43,892 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:13:43,892 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:13:43,900 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-12-02 14:13:44,096 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-12-02 14:13:44,096 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:13:44,097 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:13:44,097 INFO L85 PathProgramCache]: Analyzing trace with hash 1109329450, now seen corresponding path program 1 times [2023-12-02 14:13:44,097 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:13:44,097 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1524585828] [2023-12-02 14:13:44,097 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:13:44,097 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:13:44,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:13:44,234 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 22 proven. 3 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2023-12-02 14:13:44,234 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:13:44,235 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1524585828] [2023-12-02 14:13:44,235 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1524585828] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:13:44,235 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2116805579] [2023-12-02 14:13:44,235 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:13:44,235 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:13:44,235 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:13:44,239 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:13:44,241 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-12-02 14:13:44,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:13:44,394 INFO L262 TraceCheckSpWp]: Trace formula consists of 625 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 14:13:44,472 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:13:44,501 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 64 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2023-12-02 14:13:44,501 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 14:13:44,501 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2116805579] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:13:44,502 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 14:13:44,502 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2023-12-02 14:13:44,502 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [891795965] [2023-12-02 14:13:44,502 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:13:44,503 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 14:13:44,503 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:13:44,503 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 14:13:44,503 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-12-02 14:13:44,504 INFO L87 Difference]: Start difference. First operand 5405 states and 8439 transitions. Second operand has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 3 states have internal predecessors, (85), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 14:13:45,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:13:45,092 INFO L93 Difference]: Finished difference Result 8713 states and 13061 transitions. [2023-12-02 14:13:45,092 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 14:13:45,093 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 3 states have internal predecessors, (85), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 123 [2023-12-02 14:13:45,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:13:45,125 INFO L225 Difference]: With dead ends: 8713 [2023-12-02 14:13:45,125 INFO L226 Difference]: Without dead ends: 6791 [2023-12-02 14:13:45,132 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-12-02 14:13:45,133 INFO L413 NwaCegarLoop]: 3256 mSDtfsCounter, 78 mSDsluCounter, 3180 mSDsCounter, 0 mSdLazyCounter, 489 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 78 SdHoareTripleChecker+Valid, 6436 SdHoareTripleChecker+Invalid, 489 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 489 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 14:13:45,133 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [78 Valid, 6436 Invalid, 489 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 489 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 14:13:45,144 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6791 states. [2023-12-02 14:13:45,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6791 to 6293. [2023-12-02 14:13:45,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6293 states, 5559 states have (on average 1.579960424536787) internal successors, (8783), 5577 states have internal predecessors, (8783), 464 states have call successors, (464), 268 states have call predecessors, (464), 268 states have return successors, (464), 448 states have call predecessors, (464), 464 states have call successors, (464) [2023-12-02 14:13:45,373 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6293 states to 6293 states and 9711 transitions. [2023-12-02 14:13:45,374 INFO L78 Accepts]: Start accepts. Automaton has 6293 states and 9711 transitions. Word has length 123 [2023-12-02 14:13:45,374 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:13:45,374 INFO L495 AbstractCegarLoop]: Abstraction has 6293 states and 9711 transitions. [2023-12-02 14:13:45,375 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 3 states have internal predecessors, (85), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 14:13:45,375 INFO L276 IsEmpty]: Start isEmpty. Operand 6293 states and 9711 transitions. [2023-12-02 14:13:45,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2023-12-02 14:13:45,390 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:13:45,390 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:13:45,397 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-12-02 14:13:45,591 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:13:45,591 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:13:45,591 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:13:45,591 INFO L85 PathProgramCache]: Analyzing trace with hash 1401274724, now seen corresponding path program 1 times [2023-12-02 14:13:45,592 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:13:45,592 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1249648527] [2023-12-02 14:13:45,592 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:13:45,592 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:13:45,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:13:45,689 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 21 proven. 4 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2023-12-02 14:13:45,689 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:13:45,689 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1249648527] [2023-12-02 14:13:45,689 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1249648527] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:13:45,689 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [24125162] [2023-12-02 14:13:45,690 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:13:45,690 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:13:45,690 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:13:45,691 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:13:45,697 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-12-02 14:13:45,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:13:45,842 INFO L262 TraceCheckSpWp]: Trace formula consists of 622 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 14:13:45,845 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:13:45,871 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 66 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2023-12-02 14:13:45,871 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 14:13:45,871 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [24125162] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:13:45,871 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 14:13:45,871 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2023-12-02 14:13:45,872 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [510106490] [2023-12-02 14:13:45,872 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:13:45,872 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 14:13:45,872 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:13:45,873 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 14:13:45,873 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-12-02 14:13:45,873 INFO L87 Difference]: Start difference. First operand 6293 states and 9711 transitions. Second operand has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 3 states have internal predecessors, (85), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 14:13:46,432 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:13:46,433 INFO L93 Difference]: Finished difference Result 10545 states and 15695 transitions. [2023-12-02 14:13:46,433 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 14:13:46,433 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 3 states have internal predecessors, (85), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 123 [2023-12-02 14:13:46,434 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:13:46,458 INFO L225 Difference]: With dead ends: 10545 [2023-12-02 14:13:46,458 INFO L226 Difference]: Without dead ends: 8143 [2023-12-02 14:13:46,465 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-12-02 14:13:46,466 INFO L413 NwaCegarLoop]: 3261 mSDtfsCounter, 84 mSDsluCounter, 3180 mSDsCounter, 0 mSdLazyCounter, 490 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 84 SdHoareTripleChecker+Valid, 6441 SdHoareTripleChecker+Invalid, 490 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 490 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 14:13:46,467 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [84 Valid, 6441 Invalid, 490 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 490 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 14:13:46,478 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8143 states. [2023-12-02 14:13:46,753 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8143 to 7589. [2023-12-02 14:13:46,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7589 states, 6747 states have (on average 1.5578775752186156) internal successors, (10511), 6765 states have internal predecessors, (10511), 518 states have call successors, (518), 322 states have call predecessors, (518), 322 states have return successors, (518), 502 states have call predecessors, (518), 518 states have call successors, (518) [2023-12-02 14:13:46,778 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7589 states to 7589 states and 11547 transitions. [2023-12-02 14:13:46,778 INFO L78 Accepts]: Start accepts. Automaton has 7589 states and 11547 transitions. Word has length 123 [2023-12-02 14:13:46,779 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:13:46,779 INFO L495 AbstractCegarLoop]: Abstraction has 7589 states and 11547 transitions. [2023-12-02 14:13:46,779 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 3 states have internal predecessors, (85), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 14:13:46,779 INFO L276 IsEmpty]: Start isEmpty. Operand 7589 states and 11547 transitions. [2023-12-02 14:13:46,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2023-12-02 14:13:46,796 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:13:46,796 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:13:46,807 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-12-02 14:13:46,996 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2023-12-02 14:13:46,997 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:13:46,997 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:13:46,997 INFO L85 PathProgramCache]: Analyzing trace with hash 296184149, now seen corresponding path program 1 times [2023-12-02 14:13:46,997 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:13:46,998 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [412301539] [2023-12-02 14:13:46,998 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:13:46,998 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:13:47,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:13:47,111 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 24 proven. 1 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2023-12-02 14:13:47,111 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:13:47,111 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [412301539] [2023-12-02 14:13:47,111 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [412301539] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:13:47,111 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2143550630] [2023-12-02 14:13:47,111 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:13:47,111 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:13:47,112 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:13:47,112 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:13:47,115 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-12-02 14:13:47,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:13:47,260 INFO L262 TraceCheckSpWp]: Trace formula consists of 622 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 14:13:47,263 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:13:47,287 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 66 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2023-12-02 14:13:47,287 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 14:13:47,287 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2143550630] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:13:47,287 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 14:13:47,287 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2023-12-02 14:13:47,287 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1954309216] [2023-12-02 14:13:47,288 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:13:47,288 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 14:13:47,288 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:13:47,289 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 14:13:47,289 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-12-02 14:13:47,289 INFO L87 Difference]: Start difference. First operand 7589 states and 11547 transitions. Second operand has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 3 states have internal predecessors, (85), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 14:13:47,863 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:13:47,863 INFO L93 Difference]: Finished difference Result 12915 states and 19070 transitions. [2023-12-02 14:13:47,863 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 14:13:47,864 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 3 states have internal predecessors, (85), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 123 [2023-12-02 14:13:47,864 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:13:47,891 INFO L225 Difference]: With dead ends: 12915 [2023-12-02 14:13:47,891 INFO L226 Difference]: Without dead ends: 9838 [2023-12-02 14:13:47,900 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-12-02 14:13:47,901 INFO L413 NwaCegarLoop]: 3246 mSDtfsCounter, 66 mSDsluCounter, 3180 mSDsCounter, 0 mSdLazyCounter, 487 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 6426 SdHoareTripleChecker+Invalid, 487 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 487 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 14:13:47,901 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [66 Valid, 6426 Invalid, 487 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 487 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 14:13:47,914 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9838 states. [2023-12-02 14:13:48,180 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9838 to 9452. [2023-12-02 14:13:48,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9452 states, 8448 states have (on average 1.531841856060606) internal successors, (12941), 8466 states have internal predecessors, (12941), 599 states have call successors, (599), 403 states have call predecessors, (599), 403 states have return successors, (599), 583 states have call predecessors, (599), 599 states have call successors, (599) [2023-12-02 14:13:48,210 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9452 states to 9452 states and 14139 transitions. [2023-12-02 14:13:48,210 INFO L78 Accepts]: Start accepts. Automaton has 9452 states and 14139 transitions. Word has length 123 [2023-12-02 14:13:48,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:13:48,211 INFO L495 AbstractCegarLoop]: Abstraction has 9452 states and 14139 transitions. [2023-12-02 14:13:48,211 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 3 states have internal predecessors, (85), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 14:13:48,211 INFO L276 IsEmpty]: Start isEmpty. Operand 9452 states and 14139 transitions. [2023-12-02 14:13:48,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2023-12-02 14:13:48,229 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:13:48,230 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:13:48,235 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-12-02 14:13:48,430 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-12-02 14:13:48,430 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:13:48,431 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:13:48,431 INFO L85 PathProgramCache]: Analyzing trace with hash -1171903288, now seen corresponding path program 2 times [2023-12-02 14:13:48,431 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:13:48,431 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [931069960] [2023-12-02 14:13:48,431 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:13:48,432 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:13:48,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:13:48,693 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 10 proven. 31 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2023-12-02 14:13:48,694 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:13:48,694 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [931069960] [2023-12-02 14:13:48,694 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [931069960] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:13:48,694 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1435199158] [2023-12-02 14:13:48,694 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 14:13:48,694 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:13:48,695 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:13:48,695 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:13:48,698 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-12-02 14:13:48,942 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-12-02 14:13:48,942 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 14:13:48,945 INFO L262 TraceCheckSpWp]: Trace formula consists of 596 conjuncts, 24 conjunts are in the unsatisfiable core [2023-12-02 14:13:48,950 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:13:49,168 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 57 proven. 10 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-12-02 14:13:49,168 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:13:49,555 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 20 proven. 34 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2023-12-02 14:13:49,556 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1435199158] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:13:49,556 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1494996584] [2023-12-02 14:13:49,580 INFO L159 IcfgInterpreter]: Started Sifa with 65 locations of interest [2023-12-02 14:13:49,580 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:13:49,584 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:13:49,589 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:13:49,590 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:13:55,766 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events with input of size 158 for LOIs [2023-12-02 14:13:55,933 WARN L137 XnfTransformerHelper]: expecting exponential blowup for input size 11 [2023-12-02 14:13:56,973 WARN L137 XnfTransformerHelper]: expecting exponential blowup for input size 11 [2023-12-02 14:15:12,600 WARN L293 SmtUtils]: Spent 1.23m on a formula simplification that was a NOOP. DAG size: 1128 (called from [L 212] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.BasicPredicateFactory.xJunctTerm) [2023-12-02 14:16:26,306 WARN L293 SmtUtils]: Spent 1.23m on a formula simplification that was a NOOP. DAG size: 1128 (called from [L 212] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.BasicPredicateFactory.xJunctTerm) [2023-12-02 14:16:26,320 INFO L197 IcfgInterpreter]: Interpreting procedure fire_delta_events with input of size 139 for LOIs [2023-12-02 14:16:26,379 INFO L197 IcfgInterpreter]: Interpreting procedure update_channels with input of size 119 for LOIs [2023-12-02 14:16:26,403 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread with input of size 72 for LOIs [2023-12-02 14:16:26,451 INFO L197 IcfgInterpreter]: Interpreting procedure immediate_notify with input of size 101 for LOIs [2023-12-02 14:16:26,708 INFO L197 IcfgInterpreter]: Interpreting procedure activate_threads with input of size 176 for LOIs [2023-12-02 14:16:29,204 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 14:23:13,816 WARN L293 SmtUtils]: Spent 6.49m on a formula simplification. DAG size of input: 1128 DAG size of output: 64 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 14:23:21,569 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [1494996584] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:23:21,569 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:23:21,570 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [41] imperfect sequences [6, 7, 6] total 53 [2023-12-02 14:23:21,570 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1872137831] [2023-12-02 14:23:21,570 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:23:21,571 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2023-12-02 14:23:21,571 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:23:21,571 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2023-12-02 14:23:21,572 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=410, Invalid=2346, Unknown=0, NotChecked=0, Total=2756 [2023-12-02 14:23:21,572 INFO L87 Difference]: Start difference. First operand 9452 states and 14139 transitions. Second operand has 42 states, 35 states have (on average 1.5714285714285714) internal successors, (55), 33 states have internal predecessors, (55), 7 states have call successors, (8), 6 states have call predecessors, (8), 6 states have return successors, (8), 8 states have call predecessors, (8), 7 states have call successors, (8) [2023-12-02 14:25:01,377 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:25:01,377 INFO L93 Difference]: Finished difference Result 17907 states and 25888 transitions. [2023-12-02 14:25:01,378 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2023-12-02 14:25:01,378 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 35 states have (on average 1.5714285714285714) internal successors, (55), 33 states have internal predecessors, (55), 7 states have call successors, (8), 6 states have call predecessors, (8), 6 states have return successors, (8), 8 states have call predecessors, (8), 7 states have call successors, (8) Word has length 123 [2023-12-02 14:25:01,378 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:25:01,394 INFO L225 Difference]: With dead ends: 17907 [2023-12-02 14:25:01,395 INFO L226 Difference]: Without dead ends: 10078 [2023-12-02 14:25:01,408 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 419 GetRequests, 310 SyntacticMatches, 14 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3316 ImplicationChecksByTransitivity, 425.0s TimeCoverageRelationStatistics Valid=1177, Invalid=8135, Unknown=0, NotChecked=0, Total=9312 [2023-12-02 14:25:01,408 INFO L413 NwaCegarLoop]: 3240 mSDtfsCounter, 545 mSDsluCounter, 2015 mSDsCounter, 0 mSdLazyCounter, 56244 mSolverCounterSat, 104 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 80.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 558 SdHoareTripleChecker+Valid, 5255 SdHoareTripleChecker+Invalid, 56348 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.2s SdHoareTripleChecker+Time, 104 IncrementalHoareTripleChecker+Valid, 56244 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 86.2s IncrementalHoareTripleChecker+Time [2023-12-02 14:25:01,409 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [558 Valid, 5255 Invalid, 56348 Unknown, 0 Unchecked, 0.2s Time], IncrementalHoareTripleChecker [104 Valid, 56244 Invalid, 0 Unknown, 0 Unchecked, 86.2s Time] [2023-12-02 14:25:01,417 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10078 states. [2023-12-02 14:25:01,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10078 to 9635. [2023-12-02 14:25:01,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9635 states, 8598 states have (on average 1.5243079785996743) internal successors, (13106), 8614 states have internal predecessors, (13106), 615 states have call successors, (615), 420 states have call predecessors, (615), 420 states have return successors, (615), 601 states have call predecessors, (615), 615 states have call successors, (615) [2023-12-02 14:25:01,741 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9635 states to 9635 states and 14336 transitions. [2023-12-02 14:25:01,742 INFO L78 Accepts]: Start accepts. Automaton has 9635 states and 14336 transitions. Word has length 123 [2023-12-02 14:25:01,742 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:25:01,742 INFO L495 AbstractCegarLoop]: Abstraction has 9635 states and 14336 transitions. [2023-12-02 14:25:01,742 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 35 states have (on average 1.5714285714285714) internal successors, (55), 33 states have internal predecessors, (55), 7 states have call successors, (8), 6 states have call predecessors, (8), 6 states have return successors, (8), 8 states have call predecessors, (8), 7 states have call successors, (8) [2023-12-02 14:25:01,742 INFO L276 IsEmpty]: Start isEmpty. Operand 9635 states and 14336 transitions. [2023-12-02 14:25:01,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2023-12-02 14:25:01,754 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:25:01,754 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:25:01,759 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-12-02 14:25:01,955 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2023-12-02 14:25:01,955 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:25:01,956 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:25:01,956 INFO L85 PathProgramCache]: Analyzing trace with hash -1338096922, now seen corresponding path program 1 times [2023-12-02 14:25:01,956 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:25:01,956 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [832317007] [2023-12-02 14:25:01,956 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:25:01,956 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:25:01,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:25:02,122 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 19 proven. 33 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2023-12-02 14:25:02,122 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:25:02,123 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [832317007] [2023-12-02 14:25:02,123 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [832317007] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:25:02,123 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1932269936] [2023-12-02 14:25:02,123 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:25:02,123 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:25:02,123 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:25:02,124 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:25:02,126 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-12-02 14:25:02,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:25:02,273 INFO L262 TraceCheckSpWp]: Trace formula consists of 628 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 14:25:02,276 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:25:02,307 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 72 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-12-02 14:25:02,307 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 14:25:02,307 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1932269936] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:25:02,308 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 14:25:02,308 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-12-02 14:25:02,308 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2007052218] [2023-12-02 14:25:02,308 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:25:02,309 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 14:25:02,309 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:25:02,309 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 14:25:02,309 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 14:25:02,309 INFO L87 Difference]: Start difference. First operand 9635 states and 14336 transitions. Second operand has 3 states, 3 states have (on average 30.333333333333332) internal successors, (91), 3 states have internal predecessors, (91), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 14:25:03,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:25:03,004 INFO L93 Difference]: Finished difference Result 14593 states and 21394 transitions. [2023-12-02 14:25:03,004 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 14:25:03,005 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 30.333333333333332) internal successors, (91), 3 states have internal predecessors, (91), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 125 [2023-12-02 14:25:03,005 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:25:03,019 INFO L225 Difference]: With dead ends: 14593 [2023-12-02 14:25:03,019 INFO L226 Difference]: Without dead ends: 9653 [2023-12-02 14:25:03,027 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 127 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 14:25:03,028 INFO L413 NwaCegarLoop]: 3230 mSDtfsCounter, 112 mSDsluCounter, 3168 mSDsCounter, 0 mSdLazyCounter, 488 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 112 SdHoareTripleChecker+Valid, 6398 SdHoareTripleChecker+Invalid, 490 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 488 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 14:25:03,028 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [112 Valid, 6398 Invalid, 490 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 488 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 14:25:03,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9653 states. [2023-12-02 14:25:03,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9653 to 9505. [2023-12-02 14:25:03,296 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9505 states, 8468 states have (on average 1.5113367973547474) internal successors, (12798), 8484 states have internal predecessors, (12798), 615 states have call successors, (615), 420 states have call predecessors, (615), 420 states have return successors, (615), 601 states have call predecessors, (615), 615 states have call successors, (615) [2023-12-02 14:25:03,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9505 states to 9505 states and 14028 transitions. [2023-12-02 14:25:03,311 INFO L78 Accepts]: Start accepts. Automaton has 9505 states and 14028 transitions. Word has length 125 [2023-12-02 14:25:03,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:25:03,311 INFO L495 AbstractCegarLoop]: Abstraction has 9505 states and 14028 transitions. [2023-12-02 14:25:03,311 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 30.333333333333332) internal successors, (91), 3 states have internal predecessors, (91), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 14:25:03,311 INFO L276 IsEmpty]: Start isEmpty. Operand 9505 states and 14028 transitions. [2023-12-02 14:25:03,323 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2023-12-02 14:25:03,323 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:25:03,323 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:25:03,328 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2023-12-02 14:25:03,524 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2023-12-02 14:25:03,525 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:25:03,525 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:25:03,525 INFO L85 PathProgramCache]: Analyzing trace with hash -790071324, now seen corresponding path program 1 times [2023-12-02 14:25:03,525 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:25:03,525 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [492414350] [2023-12-02 14:25:03,525 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:25:03,525 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:25:03,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:25:03,690 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 19 proven. 31 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2023-12-02 14:25:03,690 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:25:03,690 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [492414350] [2023-12-02 14:25:03,690 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [492414350] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:25:03,691 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1995857877] [2023-12-02 14:25:03,691 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:25:03,691 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:25:03,691 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:25:03,692 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:25:03,694 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-12-02 14:25:03,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:25:03,841 INFO L262 TraceCheckSpWp]: Trace formula consists of 634 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 14:25:03,844 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:25:03,868 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 60 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-12-02 14:25:03,868 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 14:25:03,868 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1995857877] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:25:03,868 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 14:25:03,869 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-12-02 14:25:03,869 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1712698181] [2023-12-02 14:25:03,869 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:25:03,869 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 14:25:03,869 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:25:03,870 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 14:25:03,870 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 14:25:03,870 INFO L87 Difference]: Start difference. First operand 9505 states and 14028 transitions. Second operand has 3 states, 3 states have (on average 28.0) internal successors, (84), 3 states have internal predecessors, (84), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 14:25:04,432 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:25:04,432 INFO L93 Difference]: Finished difference Result 14263 states and 20580 transitions. [2023-12-02 14:25:04,432 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 14:25:04,433 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 28.0) internal successors, (84), 3 states have internal predecessors, (84), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 125 [2023-12-02 14:25:04,433 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:25:04,446 INFO L225 Difference]: With dead ends: 14263 [2023-12-02 14:25:04,446 INFO L226 Difference]: Without dead ends: 10141 [2023-12-02 14:25:04,453 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 127 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 14:25:04,454 INFO L413 NwaCegarLoop]: 3190 mSDtfsCounter, 3391 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 245 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3391 SdHoareTripleChecker+Valid, 3219 SdHoareTripleChecker+Invalid, 249 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 245 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 14:25:04,454 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3391 Valid, 3219 Invalid, 249 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 245 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 14:25:04,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10141 states. [2023-12-02 14:25:04,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10141 to 10141. [2023-12-02 14:25:04,774 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10141 states, 9020 states have (on average 1.4917960088691795) internal successors, (13456), 9036 states have internal predecessors, (13456), 643 states have call successors, (643), 476 states have call predecessors, (643), 476 states have return successors, (643), 629 states have call predecessors, (643), 643 states have call successors, (643) [2023-12-02 14:25:04,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10141 states to 10141 states and 14742 transitions. [2023-12-02 14:25:04,788 INFO L78 Accepts]: Start accepts. Automaton has 10141 states and 14742 transitions. Word has length 125 [2023-12-02 14:25:04,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:25:04,788 INFO L495 AbstractCegarLoop]: Abstraction has 10141 states and 14742 transitions. [2023-12-02 14:25:04,788 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 28.0) internal successors, (84), 3 states have internal predecessors, (84), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 14:25:04,788 INFO L276 IsEmpty]: Start isEmpty. Operand 10141 states and 14742 transitions. [2023-12-02 14:25:04,800 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2023-12-02 14:25:04,800 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:25:04,800 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:25:04,805 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2023-12-02 14:25:05,000 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2023-12-02 14:25:05,001 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:25:05,001 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:25:05,001 INFO L85 PathProgramCache]: Analyzing trace with hash -395308771, now seen corresponding path program 1 times [2023-12-02 14:25:05,001 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:25:05,001 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [131866367] [2023-12-02 14:25:05,001 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:25:05,002 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:25:05,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:25:05,159 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 19 proven. 32 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2023-12-02 14:25:05,159 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:25:05,160 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [131866367] [2023-12-02 14:25:05,160 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [131866367] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:25:05,160 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [796336488] [2023-12-02 14:25:05,160 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:25:05,160 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:25:05,160 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:25:05,161 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:25:05,164 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-12-02 14:25:05,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:25:05,321 INFO L262 TraceCheckSpWp]: Trace formula consists of 633 conjuncts, 9 conjunts are in the unsatisfiable core [2023-12-02 14:25:05,324 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:25:05,413 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 57 proven. 0 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2023-12-02 14:25:05,413 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 14:25:05,414 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [796336488] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:25:05,414 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 14:25:05,414 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 10 [2023-12-02 14:25:05,414 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [28046449] [2023-12-02 14:25:05,414 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:25:05,414 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 14:25:05,415 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:25:05,415 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 14:25:05,415 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2023-12-02 14:25:05,415 INFO L87 Difference]: Start difference. First operand 10141 states and 14742 transitions. Second operand has 6 states, 5 states have (on average 16.8) internal successors, (84), 6 states have internal predecessors, (84), 3 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 14:25:06,444 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:25:06,445 INFO L93 Difference]: Finished difference Result 21541 states and 30106 transitions. [2023-12-02 14:25:06,445 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-12-02 14:25:06,445 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 16.8) internal successors, (84), 6 states have internal predecessors, (84), 3 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 126 [2023-12-02 14:25:06,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:25:06,464 INFO L225 Difference]: With dead ends: 21541 [2023-12-02 14:25:06,465 INFO L226 Difference]: Without dead ends: 13105 [2023-12-02 14:25:06,479 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 125 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2023-12-02 14:25:06,480 INFO L413 NwaCegarLoop]: 3166 mSDtfsCounter, 3614 mSDsluCounter, 6310 mSDsCounter, 0 mSdLazyCounter, 780 mSolverCounterSat, 111 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3627 SdHoareTripleChecker+Valid, 9476 SdHoareTripleChecker+Invalid, 891 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 111 IncrementalHoareTripleChecker+Valid, 780 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-12-02 14:25:06,480 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3627 Valid, 9476 Invalid, 891 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [111 Valid, 780 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-12-02 14:25:06,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13105 states. [2023-12-02 14:25:06,867 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13105 to 13103. [2023-12-02 14:25:06,876 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13103 states, 11528 states have (on average 1.4511623872310895) internal successors, (16729), 11552 states have internal predecessors, (16729), 906 states have call successors, (906), 667 states have call predecessors, (906), 667 states have return successors, (906), 884 states have call predecessors, (906), 906 states have call successors, (906) [2023-12-02 14:25:06,895 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13103 states to 13103 states and 18541 transitions. [2023-12-02 14:25:06,896 INFO L78 Accepts]: Start accepts. Automaton has 13103 states and 18541 transitions. Word has length 126 [2023-12-02 14:25:06,896 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:25:06,896 INFO L495 AbstractCegarLoop]: Abstraction has 13103 states and 18541 transitions. [2023-12-02 14:25:06,897 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 16.8) internal successors, (84), 6 states have internal predecessors, (84), 3 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 14:25:06,897 INFO L276 IsEmpty]: Start isEmpty. Operand 13103 states and 18541 transitions. [2023-12-02 14:25:06,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2023-12-02 14:25:06,908 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:25:06,908 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 14:25:06,914 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2023-12-02 14:25:07,108 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2023-12-02 14:25:07,109 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:25:07,109 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:25:07,109 INFO L85 PathProgramCache]: Analyzing trace with hash -836310956, now seen corresponding path program 1 times [2023-12-02 14:25:07,109 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:25:07,109 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2079289895] [2023-12-02 14:25:07,109 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:25:07,109 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:25:07,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:25:07,327 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 15 proven. 32 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2023-12-02 14:25:07,327 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:25:07,327 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2079289895] [2023-12-02 14:25:07,327 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2079289895] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:25:07,328 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1510779802] [2023-12-02 14:25:07,328 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:25:07,328 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:25:07,328 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:25:07,329 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:25:07,332 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-12-02 14:25:07,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:25:07,488 INFO L262 TraceCheckSpWp]: Trace formula consists of 646 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 14:25:07,491 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:25:07,529 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 80 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-12-02 14:25:07,529 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 14:25:07,529 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1510779802] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:25:07,530 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 14:25:07,530 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-12-02 14:25:07,530 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1383079930] [2023-12-02 14:25:07,530 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:25:07,530 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 14:25:07,531 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:25:07,531 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 14:25:07,531 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 14:25:07,531 INFO L87 Difference]: Start difference. First operand 13103 states and 18541 transitions. Second operand has 3 states, 3 states have (on average 35.0) internal successors, (105), 3 states have internal predecessors, (105), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 14:25:08,413 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:25:08,413 INFO L93 Difference]: Finished difference Result 21299 states and 29818 transitions. [2023-12-02 14:25:08,413 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 14:25:08,414 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 35.0) internal successors, (105), 3 states have internal predecessors, (105), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 130 [2023-12-02 14:25:08,414 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:25:08,431 INFO L225 Difference]: With dead ends: 21299 [2023-12-02 14:25:08,431 INFO L226 Difference]: Without dead ends: 13121 [2023-12-02 14:25:08,443 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 132 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 14:25:08,443 INFO L413 NwaCegarLoop]: 3272 mSDtfsCounter, 105 mSDsluCounter, 3166 mSDsCounter, 0 mSdLazyCounter, 494 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 105 SdHoareTripleChecker+Valid, 6438 SdHoareTripleChecker+Invalid, 496 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 494 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 14:25:08,444 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [105 Valid, 6438 Invalid, 496 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 494 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 14:25:08,453 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13121 states. [2023-12-02 14:25:08,855 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13121 to 12973. [2023-12-02 14:25:08,864 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12973 states, 11398 states have (on average 1.4364800842253027) internal successors, (16373), 11422 states have internal predecessors, (16373), 906 states have call successors, (906), 667 states have call predecessors, (906), 667 states have return successors, (906), 884 states have call predecessors, (906), 906 states have call successors, (906) [2023-12-02 14:25:08,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12973 states to 12973 states and 18185 transitions. [2023-12-02 14:25:08,883 INFO L78 Accepts]: Start accepts. Automaton has 12973 states and 18185 transitions. Word has length 130 [2023-12-02 14:25:08,884 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:25:08,884 INFO L495 AbstractCegarLoop]: Abstraction has 12973 states and 18185 transitions. [2023-12-02 14:25:08,884 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 35.0) internal successors, (105), 3 states have internal predecessors, (105), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 14:25:08,884 INFO L276 IsEmpty]: Start isEmpty. Operand 12973 states and 18185 transitions. [2023-12-02 14:25:08,893 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2023-12-02 14:25:08,894 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:25:08,894 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 14:25:08,899 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2023-12-02 14:25:09,094 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2023-12-02 14:25:09,095 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:25:09,095 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:25:09,095 INFO L85 PathProgramCache]: Analyzing trace with hash 410956498, now seen corresponding path program 1 times [2023-12-02 14:25:09,095 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:25:09,095 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [702883916] [2023-12-02 14:25:09,095 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:25:09,095 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:25:09,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:25:09,313 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 15 proven. 30 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2023-12-02 14:25:09,313 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:25:09,313 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [702883916] [2023-12-02 14:25:09,313 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [702883916] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:25:09,314 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2030194511] [2023-12-02 14:25:09,314 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:25:09,314 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:25:09,314 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:25:09,315 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:25:09,320 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-12-02 14:25:09,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:25:09,463 INFO L262 TraceCheckSpWp]: Trace formula consists of 652 conjuncts, 5 conjunts are in the unsatisfiable core [2023-12-02 14:25:09,465 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:25:09,494 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 70 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2023-12-02 14:25:09,495 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 14:25:09,495 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2030194511] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:25:09,495 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 14:25:09,495 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 8 [2023-12-02 14:25:09,495 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1582328973] [2023-12-02 14:25:09,495 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:25:09,496 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 14:25:09,496 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:25:09,496 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 14:25:09,496 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2023-12-02 14:25:09,496 INFO L87 Difference]: Start difference. First operand 12973 states and 18185 transitions. Second operand has 4 states, 4 states have (on average 24.75) internal successors, (99), 4 states have internal predecessors, (99), 2 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) [2023-12-02 14:25:10,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:25:10,593 INFO L93 Difference]: Finished difference Result 32495 states and 43825 transitions. [2023-12-02 14:25:10,594 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-12-02 14:25:10,594 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 24.75) internal successors, (99), 4 states have internal predecessors, (99), 2 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) Word has length 130 [2023-12-02 14:25:10,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:25:10,624 INFO L225 Difference]: With dead ends: 32495 [2023-12-02 14:25:10,624 INFO L226 Difference]: Without dead ends: 21227 [2023-12-02 14:25:10,635 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 131 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2023-12-02 14:25:10,636 INFO L413 NwaCegarLoop]: 3265 mSDtfsCounter, 3378 mSDsluCounter, 3376 mSDsCounter, 0 mSdLazyCounter, 538 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3378 SdHoareTripleChecker+Valid, 6641 SdHoareTripleChecker+Invalid, 541 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 538 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 14:25:10,636 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3378 Valid, 6641 Invalid, 541 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 538 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 14:25:10,649 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21227 states. [2023-12-02 14:25:11,324 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21227 to 21175. [2023-12-02 14:25:11,339 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21175 states, 18279 states have (on average 1.3854149570545435) internal successors, (25324), 18325 states have internal predecessors, (25324), 1672 states have call successors, (1672), 1222 states have call predecessors, (1672), 1222 states have return successors, (1720), 1628 states have call predecessors, (1720), 1672 states have call successors, (1720) [2023-12-02 14:25:11,374 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21175 states to 21175 states and 28716 transitions. [2023-12-02 14:25:11,375 INFO L78 Accepts]: Start accepts. Automaton has 21175 states and 28716 transitions. Word has length 130 [2023-12-02 14:25:11,376 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:25:11,376 INFO L495 AbstractCegarLoop]: Abstraction has 21175 states and 28716 transitions. [2023-12-02 14:25:11,376 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 24.75) internal successors, (99), 4 states have internal predecessors, (99), 2 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) [2023-12-02 14:25:11,376 INFO L276 IsEmpty]: Start isEmpty. Operand 21175 states and 28716 transitions. [2023-12-02 14:25:11,388 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2023-12-02 14:25:11,388 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:25:11,388 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 14:25:11,393 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2023-12-02 14:25:11,589 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:25:11,589 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:25:11,589 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:25:11,589 INFO L85 PathProgramCache]: Analyzing trace with hash -2003574467, now seen corresponding path program 1 times [2023-12-02 14:25:11,589 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:25:11,589 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1499203536] [2023-12-02 14:25:11,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:25:11,590 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:25:11,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:25:11,787 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 15 proven. 31 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2023-12-02 14:25:11,787 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:25:11,788 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1499203536] [2023-12-02 14:25:11,788 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1499203536] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:25:11,788 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [674902509] [2023-12-02 14:25:11,788 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:25:11,788 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:25:11,788 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:25:11,789 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:25:11,792 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-12-02 14:25:11,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:25:11,934 INFO L262 TraceCheckSpWp]: Trace formula consists of 651 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 14:25:11,936 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:25:11,952 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 63 proven. 0 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2023-12-02 14:25:11,952 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 14:25:11,952 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [674902509] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:25:11,952 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 14:25:11,952 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-12-02 14:25:11,953 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1044985228] [2023-12-02 14:25:11,953 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:25:11,953 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 14:25:11,953 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:25:11,954 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 14:25:11,954 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 14:25:11,954 INFO L87 Difference]: Start difference. First operand 21175 states and 28716 transitions. Second operand has 3 states, 3 states have (on average 30.666666666666668) internal successors, (92), 3 states have internal predecessors, (92), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 14:25:12,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:25:12,921 INFO L93 Difference]: Finished difference Result 26275 states and 35499 transitions. [2023-12-02 14:25:12,921 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 14:25:12,922 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 30.666666666666668) internal successors, (92), 3 states have internal predecessors, (92), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 131 [2023-12-02 14:25:12,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:25:12,951 INFO L225 Difference]: With dead ends: 26275 [2023-12-02 14:25:12,951 INFO L226 Difference]: Without dead ends: 20040 [2023-12-02 14:25:12,961 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 133 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 14:25:12,962 INFO L413 NwaCegarLoop]: 3189 mSDtfsCounter, 28 mSDsluCounter, 3171 mSDsCounter, 0 mSdLazyCounter, 479 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 6360 SdHoareTripleChecker+Invalid, 479 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 479 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 14:25:12,962 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 6360 Invalid, 479 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 479 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 14:25:12,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20040 states. [2023-12-02 14:25:13,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20040 to 19764. [2023-12-02 14:25:13,764 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19764 states, 17036 states have (on average 1.3898802535806527) internal successors, (23678), 17070 states have internal predecessors, (23678), 1588 states have call successors, (1588), 1138 states have call predecessors, (1588), 1138 states have return successors, (1588), 1556 states have call predecessors, (1588), 1588 states have call successors, (1588) [2023-12-02 14:25:13,791 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19764 states to 19764 states and 26854 transitions. [2023-12-02 14:25:13,791 INFO L78 Accepts]: Start accepts. Automaton has 19764 states and 26854 transitions. Word has length 131 [2023-12-02 14:25:13,791 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:25:13,792 INFO L495 AbstractCegarLoop]: Abstraction has 19764 states and 26854 transitions. [2023-12-02 14:25:13,792 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 30.666666666666668) internal successors, (92), 3 states have internal predecessors, (92), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 14:25:13,792 INFO L276 IsEmpty]: Start isEmpty. Operand 19764 states and 26854 transitions. [2023-12-02 14:25:13,803 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2023-12-02 14:25:13,804 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:25:13,804 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 14:25:13,808 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2023-12-02 14:25:14,004 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:25:14,004 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:25:14,005 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:25:14,005 INFO L85 PathProgramCache]: Analyzing trace with hash 1323087798, now seen corresponding path program 1 times [2023-12-02 14:25:14,005 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:25:14,005 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [867163101] [2023-12-02 14:25:14,005 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:25:14,005 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:25:14,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:25:14,224 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 19 proven. 34 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2023-12-02 14:25:14,224 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:25:14,224 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [867163101] [2023-12-02 14:25:14,224 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [867163101] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:25:14,224 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [683702173] [2023-12-02 14:25:14,225 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:25:14,225 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:25:14,225 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:25:14,226 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:25:14,228 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2023-12-02 14:25:14,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:25:14,374 INFO L262 TraceCheckSpWp]: Trace formula consists of 667 conjuncts, 6 conjunts are in the unsatisfiable core [2023-12-02 14:25:14,377 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:25:14,427 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 74 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-12-02 14:25:14,428 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 14:25:14,428 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [683702173] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:25:14,428 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 14:25:14,428 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-12-02 14:25:14,428 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1678654057] [2023-12-02 14:25:14,428 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:25:14,429 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 14:25:14,429 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:25:14,429 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 14:25:14,429 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 14:25:14,430 INFO L87 Difference]: Start difference. First operand 19764 states and 26854 transitions. Second operand has 3 states, 3 states have (on average 35.666666666666664) internal successors, (107), 3 states have internal predecessors, (107), 3 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 14:25:15,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:25:15,368 INFO L93 Difference]: Finished difference Result 33832 states and 45389 transitions. [2023-12-02 14:25:15,369 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 14:25:15,369 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 35.666666666666664) internal successors, (107), 3 states have internal predecessors, (107), 3 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 136 [2023-12-02 14:25:15,369 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:25:15,408 INFO L225 Difference]: With dead ends: 33832 [2023-12-02 14:25:15,408 INFO L226 Difference]: Without dead ends: 21902 [2023-12-02 14:25:15,423 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 144 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 14:25:15,423 INFO L413 NwaCegarLoop]: 3195 mSDtfsCounter, 3355 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 251 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3355 SdHoareTripleChecker+Valid, 3231 SdHoareTripleChecker+Invalid, 255 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 251 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 14:25:15,424 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3355 Valid, 3231 Invalid, 255 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 251 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 14:25:15,438 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21902 states. [2023-12-02 14:25:16,223 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21902 to 21730. [2023-12-02 14:25:16,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21730 states, 18832 states have (on average 1.362892948173322) internal successors, (25666), 18866 states have internal predecessors, (25666), 1624 states have call successors, (1624), 1272 states have call predecessors, (1624), 1272 states have return successors, (1746), 1592 states have call predecessors, (1746), 1624 states have call successors, (1746) [2023-12-02 14:25:16,268 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21730 states to 21730 states and 29036 transitions. [2023-12-02 14:25:16,269 INFO L78 Accepts]: Start accepts. Automaton has 21730 states and 29036 transitions. Word has length 136 [2023-12-02 14:25:16,269 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:25:16,269 INFO L495 AbstractCegarLoop]: Abstraction has 21730 states and 29036 transitions. [2023-12-02 14:25:16,269 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 35.666666666666664) internal successors, (107), 3 states have internal predecessors, (107), 3 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 14:25:16,269 INFO L276 IsEmpty]: Start isEmpty. Operand 21730 states and 29036 transitions. [2023-12-02 14:25:16,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2023-12-02 14:25:16,283 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:25:16,284 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 14:25:16,288 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2023-12-02 14:25:16,484 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2023-12-02 14:25:16,484 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:25:16,485 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:25:16,485 INFO L85 PathProgramCache]: Analyzing trace with hash 2123436528, now seen corresponding path program 1 times [2023-12-02 14:25:16,485 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:25:16,485 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [198655844] [2023-12-02 14:25:16,485 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:25:16,485 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:25:16,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:25:16,826 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 12 proven. 30 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2023-12-02 14:25:16,827 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:25:16,827 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [198655844] [2023-12-02 14:25:16,827 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [198655844] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:25:16,827 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1465734115] [2023-12-02 14:25:16,827 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:25:16,827 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:25:16,827 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:25:16,828 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:25:16,829 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2023-12-02 14:25:16,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:25:16,951 INFO L262 TraceCheckSpWp]: Trace formula consists of 724 conjuncts, 24 conjunts are in the unsatisfiable core [2023-12-02 14:25:16,956 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:25:17,051 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 56 proven. 11 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2023-12-02 14:25:17,052 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:25:17,326 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 13 proven. 30 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2023-12-02 14:25:17,326 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1465734115] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:25:17,326 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [97323831] [2023-12-02 14:25:17,330 INFO L159 IcfgInterpreter]: Started Sifa with 75 locations of interest [2023-12-02 14:25:17,331 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:25:17,331 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:25:17,331 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:25:17,331 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:25:33,346 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events with input of size 1 for LOIs [2023-12-02 14:25:33,354 INFO L197 IcfgInterpreter]: Interpreting procedure fire_delta_events with input of size 151 for LOIs [2023-12-02 14:25:33,441 INFO L197 IcfgInterpreter]: Interpreting procedure update_channels with input of size 1 for LOIs [2023-12-02 14:25:33,442 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread with input of size 1 for LOIs [2023-12-02 14:25:33,451 INFO L197 IcfgInterpreter]: Interpreting procedure immediate_notify with input of size 94 for LOIs [2023-12-02 14:25:33,666 INFO L197 IcfgInterpreter]: Interpreting procedure activate_threads with input of size 1 for LOIs [2023-12-02 14:25:33,806 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 14:25:40,702 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '488692#(and (= ~a15~0 1) (= 5 ~a20~0) (= |ULTIMATE.start_stop_simulation_#res#1| 0) (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_eval_~tmp_ndt_1~0#1| 2147483647) (= ~t1_pc~0 0) (= ~t1_i~0 1) (= |ULTIMATE.start_start_simulation_~tmp___0~1#1| 0) (= ~a25~0 1) (not (= ~token~0 (+ ~local~0 4))) (= ~a~0 1) (= |ULTIMATE.start_start_simulation_~kernel_st~0#1| 1) (<= |ULTIMATE.start_eval_~tmp~0#1| 1) (= ~d~0 4) (= 0 ~t3_pc~0) (= ~a16~0 1) (<= 0 (+ |ULTIMATE.start_eval_~tmp_ndt_1~0#1| 2147483648)) (= 5 ~e~0) (= ~m_pc~0 1) (= ~m_i~0 1) (= ~a12~0 4) (= ~a9~0 18) (= 6 ~f~0) (= 3 ~c~0) (= ~t2_i~0 1) (= 2 ~b~0) (= 0 ~t2_pc~0) (not (= |ULTIMATE.start_eval_~tmp_ndt_1~0#1| 0)) (= ~m_st~0 1) (= 1 ~t4_pc~0) (= ~a27~0 1) (= ~t3_i~0 1) (= ~t4_i~0 1) (<= 0 |ULTIMATE.start_eval_~tmp~0#1|) (= ~a2~0 10))' at error location [2023-12-02 14:25:40,703 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 14:25:40,703 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:25:40,703 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7, 6] total 9 [2023-12-02 14:25:40,703 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [387483836] [2023-12-02 14:25:40,703 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:25:40,704 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-12-02 14:25:40,704 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:25:40,704 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-12-02 14:25:40,706 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=321, Invalid=3711, Unknown=0, NotChecked=0, Total=4032 [2023-12-02 14:25:40,706 INFO L87 Difference]: Start difference. First operand 21730 states and 29036 transitions. Second operand has 9 states, 9 states have (on average 14.666666666666666) internal successors, (132), 9 states have internal predecessors, (132), 5 states have call successors, (28), 6 states have call predecessors, (28), 7 states have return successors, (30), 6 states have call predecessors, (30), 5 states have call successors, (30) [2023-12-02 14:25:42,120 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:25:42,120 INFO L93 Difference]: Finished difference Result 37920 states and 49684 transitions. [2023-12-02 14:25:42,121 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-12-02 14:25:42,121 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 14.666666666666666) internal successors, (132), 9 states have internal predecessors, (132), 5 states have call successors, (28), 6 states have call predecessors, (28), 7 states have return successors, (30), 6 states have call predecessors, (30), 5 states have call successors, (30) Word has length 132 [2023-12-02 14:25:42,121 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:25:42,148 INFO L225 Difference]: With dead ends: 37920 [2023-12-02 14:25:42,148 INFO L226 Difference]: Without dead ends: 17940 [2023-12-02 14:25:42,166 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 417 GetRequests, 348 SyntacticMatches, 1 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1797 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=384, Invalid=4446, Unknown=0, NotChecked=0, Total=4830 [2023-12-02 14:25:42,166 INFO L413 NwaCegarLoop]: 3211 mSDtfsCounter, 6898 mSDsluCounter, 6417 mSDsCounter, 0 mSdLazyCounter, 856 mSolverCounterSat, 106 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6911 SdHoareTripleChecker+Valid, 9628 SdHoareTripleChecker+Invalid, 962 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 106 IncrementalHoareTripleChecker+Valid, 856 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-12-02 14:25:42,166 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6911 Valid, 9628 Invalid, 962 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [106 Valid, 856 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-12-02 14:25:42,177 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17940 states. [2023-12-02 14:25:42,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17940 to 17167. [2023-12-02 14:25:42,776 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17167 states, 14971 states have (on average 1.3781310533698483) internal successors, (20632), 14995 states have internal predecessors, (20632), 1233 states have call successors, (1233), 961 states have call predecessors, (1233), 961 states have return successors, (1325), 1211 states have call predecessors, (1325), 1233 states have call successors, (1325) [2023-12-02 14:25:42,800 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17167 states to 17167 states and 23190 transitions. [2023-12-02 14:25:42,801 INFO L78 Accepts]: Start accepts. Automaton has 17167 states and 23190 transitions. Word has length 132 [2023-12-02 14:25:42,801 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:25:42,801 INFO L495 AbstractCegarLoop]: Abstraction has 17167 states and 23190 transitions. [2023-12-02 14:25:42,802 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 14.666666666666666) internal successors, (132), 9 states have internal predecessors, (132), 5 states have call successors, (28), 6 states have call predecessors, (28), 7 states have return successors, (30), 6 states have call predecessors, (30), 5 states have call successors, (30) [2023-12-02 14:25:42,802 INFO L276 IsEmpty]: Start isEmpty. Operand 17167 states and 23190 transitions. [2023-12-02 14:25:42,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2023-12-02 14:25:42,813 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:25:42,813 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 14:25:42,818 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2023-12-02 14:25:43,013 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:25:43,013 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:25:43,014 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:25:43,014 INFO L85 PathProgramCache]: Analyzing trace with hash -820774498, now seen corresponding path program 1 times [2023-12-02 14:25:43,014 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:25:43,014 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1945098788] [2023-12-02 14:25:43,014 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:25:43,014 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:25:43,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:25:43,289 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 19 proven. 36 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2023-12-02 14:25:43,289 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:25:43,289 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1945098788] [2023-12-02 14:25:43,289 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1945098788] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:25:43,289 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1600541496] [2023-12-02 14:25:43,289 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:25:43,289 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:25:43,289 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:25:43,290 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:25:43,291 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2023-12-02 14:25:43,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:25:43,425 INFO L262 TraceCheckSpWp]: Trace formula consists of 665 conjuncts, 22 conjunts are in the unsatisfiable core [2023-12-02 14:25:43,428 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:25:43,504 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 89 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:25:43,504 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 14:25:43,504 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1600541496] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:25:43,504 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 14:25:43,504 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 9 [2023-12-02 14:25:43,504 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [914439914] [2023-12-02 14:25:43,505 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:25:43,505 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 14:25:43,505 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:25:43,506 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 14:25:43,506 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2023-12-02 14:25:43,506 INFO L87 Difference]: Start difference. First operand 17167 states and 23190 transitions. Second operand has 6 states, 6 states have (on average 19.333333333333332) internal successors, (116), 6 states have internal predecessors, (116), 5 states have call successors, (11), 5 states have call predecessors, (11), 5 states have return successors, (11), 5 states have call predecessors, (11), 5 states have call successors, (11) [2023-12-02 14:25:45,116 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:25:45,116 INFO L93 Difference]: Finished difference Result 31545 states and 41884 transitions. [2023-12-02 14:25:45,116 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-12-02 14:25:45,116 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 19.333333333333332) internal successors, (116), 6 states have internal predecessors, (116), 5 states have call successors, (11), 5 states have call predecessors, (11), 5 states have return successors, (11), 5 states have call predecessors, (11), 5 states have call successors, (11) Word has length 138 [2023-12-02 14:25:45,117 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:25:45,157 INFO L225 Difference]: With dead ends: 31545 [2023-12-02 14:25:45,157 INFO L226 Difference]: Without dead ends: 21303 [2023-12-02 14:25:45,169 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 147 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=48, Invalid=134, Unknown=0, NotChecked=0, Total=182 [2023-12-02 14:25:45,170 INFO L413 NwaCegarLoop]: 3259 mSDtfsCounter, 231 mSDsluCounter, 9415 mSDsCounter, 0 mSdLazyCounter, 1076 mSolverCounterSat, 43 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 247 SdHoareTripleChecker+Valid, 12674 SdHoareTripleChecker+Invalid, 1119 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 43 IncrementalHoareTripleChecker+Valid, 1076 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-12-02 14:25:45,170 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [247 Valid, 12674 Invalid, 1119 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [43 Valid, 1076 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-12-02 14:25:45,184 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21303 states. [2023-12-02 14:25:45,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21303 to 19627. [2023-12-02 14:25:45,939 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19627 states, 16975 states have (on average 1.3575257731958763) internal successors, (23044), 16983 states have internal predecessors, (23044), 1517 states have call successors, (1517), 1165 states have call predecessors, (1517), 1133 states have return successors, (1657), 1479 states have call predecessors, (1657), 1517 states have call successors, (1657) [2023-12-02 14:25:45,967 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19627 states to 19627 states and 26218 transitions. [2023-12-02 14:25:45,968 INFO L78 Accepts]: Start accepts. Automaton has 19627 states and 26218 transitions. Word has length 138 [2023-12-02 14:25:45,968 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:25:45,969 INFO L495 AbstractCegarLoop]: Abstraction has 19627 states and 26218 transitions. [2023-12-02 14:25:45,969 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 19.333333333333332) internal successors, (116), 6 states have internal predecessors, (116), 5 states have call successors, (11), 5 states have call predecessors, (11), 5 states have return successors, (11), 5 states have call predecessors, (11), 5 states have call successors, (11) [2023-12-02 14:25:45,969 INFO L276 IsEmpty]: Start isEmpty. Operand 19627 states and 26218 transitions. [2023-12-02 14:25:45,980 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2023-12-02 14:25:45,981 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:25:45,981 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:25:45,986 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2023-12-02 14:25:46,181 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:25:46,182 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:25:46,182 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:25:46,182 INFO L85 PathProgramCache]: Analyzing trace with hash -522316909, now seen corresponding path program 1 times [2023-12-02 14:25:46,182 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:25:46,182 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1906623581] [2023-12-02 14:25:46,182 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:25:46,182 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:25:46,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:25:46,338 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 19 proven. 32 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-12-02 14:25:46,338 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:25:46,338 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1906623581] [2023-12-02 14:25:46,338 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1906623581] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:25:46,339 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [55548739] [2023-12-02 14:25:46,339 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:25:46,339 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:25:46,339 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:25:46,340 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:25:46,341 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2023-12-02 14:25:46,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:25:46,475 INFO L262 TraceCheckSpWp]: Trace formula consists of 645 conjuncts, 9 conjunts are in the unsatisfiable core [2023-12-02 14:25:46,478 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:25:46,535 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 55 proven. 0 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2023-12-02 14:25:46,536 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 14:25:46,536 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [55548739] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:25:46,536 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 14:25:46,536 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 7 [2023-12-02 14:25:46,536 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [719609666] [2023-12-02 14:25:46,536 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:25:46,537 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 14:25:46,537 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:25:46,537 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 14:25:46,537 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2023-12-02 14:25:46,537 INFO L87 Difference]: Start difference. First operand 19627 states and 26218 transitions. Second operand has 6 states, 6 states have (on average 14.0) internal successors, (84), 6 states have internal predecessors, (84), 3 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 14:25:48,377 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:25:48,377 INFO L93 Difference]: Finished difference Result 44428 states and 57777 transitions. [2023-12-02 14:25:48,378 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-12-02 14:25:48,378 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 14.0) internal successors, (84), 6 states have internal predecessors, (84), 3 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 130 [2023-12-02 14:25:48,378 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:25:48,418 INFO L225 Difference]: With dead ends: 44428 [2023-12-02 14:25:48,418 INFO L226 Difference]: Without dead ends: 26549 [2023-12-02 14:25:48,433 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 132 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2023-12-02 14:25:48,434 INFO L413 NwaCegarLoop]: 3181 mSDtfsCounter, 3590 mSDsluCounter, 6331 mSDsCounter, 0 mSdLazyCounter, 800 mSolverCounterSat, 82 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3603 SdHoareTripleChecker+Valid, 9512 SdHoareTripleChecker+Invalid, 882 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 82 IncrementalHoareTripleChecker+Valid, 800 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-12-02 14:25:48,434 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3603 Valid, 9512 Invalid, 882 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [82 Valid, 800 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-12-02 14:25:48,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26549 states. [2023-12-02 14:25:49,510 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26549 to 26539. [2023-12-02 14:25:49,528 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26539 states, 22761 states have (on average 1.3234040683625499) internal successors, (30122), 22772 states have internal predecessors, (30122), 2161 states have call successors, (2161), 1661 states have call predecessors, (2161), 1615 states have return successors, (2369), 2106 states have call predecessors, (2369), 2161 states have call successors, (2369) [2023-12-02 14:25:49,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26539 states to 26539 states and 34652 transitions. [2023-12-02 14:25:49,570 INFO L78 Accepts]: Start accepts. Automaton has 26539 states and 34652 transitions. Word has length 130 [2023-12-02 14:25:49,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:25:49,570 INFO L495 AbstractCegarLoop]: Abstraction has 26539 states and 34652 transitions. [2023-12-02 14:25:49,570 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 14.0) internal successors, (84), 6 states have internal predecessors, (84), 3 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 14:25:49,570 INFO L276 IsEmpty]: Start isEmpty. Operand 26539 states and 34652 transitions. [2023-12-02 14:25:49,585 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2023-12-02 14:25:49,585 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:25:49,585 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 14:25:49,590 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2023-12-02 14:25:49,786 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2023-12-02 14:25:49,786 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:25:49,786 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:25:49,786 INFO L85 PathProgramCache]: Analyzing trace with hash -2118855120, now seen corresponding path program 1 times [2023-12-02 14:25:49,786 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:25:49,787 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1666354528] [2023-12-02 14:25:49,787 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:25:49,787 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:25:49,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:25:50,000 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 12 proven. 30 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2023-12-02 14:25:50,001 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:25:50,001 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1666354528] [2023-12-02 14:25:50,001 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1666354528] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:25:50,001 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [900983457] [2023-12-02 14:25:50,001 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:25:50,001 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:25:50,001 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:25:50,002 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:25:50,003 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2023-12-02 14:25:50,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:25:50,136 INFO L262 TraceCheckSpWp]: Trace formula consists of 736 conjuncts, 16 conjunts are in the unsatisfiable core [2023-12-02 14:25:50,140 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:25:50,220 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 66 proven. 0 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2023-12-02 14:25:50,220 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 14:25:50,220 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [900983457] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:25:50,221 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 14:25:50,221 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [6] total 11 [2023-12-02 14:25:50,221 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1196974634] [2023-12-02 14:25:50,221 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:25:50,221 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-12-02 14:25:50,221 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:25:50,222 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-12-02 14:25:50,222 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2023-12-02 14:25:50,222 INFO L87 Difference]: Start difference. First operand 26539 states and 34652 transitions. Second operand has 7 states, 6 states have (on average 14.666666666666666) internal successors, (88), 6 states have internal predecessors, (88), 3 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) [2023-12-02 14:25:52,357 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:25:52,358 INFO L93 Difference]: Finished difference Result 44702 states and 58297 transitions. [2023-12-02 14:25:52,358 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-12-02 14:25:52,358 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 14.666666666666666) internal successors, (88), 6 states have internal predecessors, (88), 3 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) Word has length 136 [2023-12-02 14:25:52,358 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:25:52,412 INFO L225 Difference]: With dead ends: 44702 [2023-12-02 14:25:52,413 INFO L226 Difference]: Without dead ends: 30881 [2023-12-02 14:25:52,433 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 142 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=47, Invalid=163, Unknown=0, NotChecked=0, Total=210 [2023-12-02 14:25:52,434 INFO L413 NwaCegarLoop]: 3275 mSDtfsCounter, 204 mSDsluCounter, 13019 mSDsCounter, 0 mSdLazyCounter, 1338 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 209 SdHoareTripleChecker+Valid, 16294 SdHoareTripleChecker+Invalid, 1343 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 1338 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-12-02 14:25:52,434 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [209 Valid, 16294 Invalid, 1343 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 1338 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-12-02 14:25:52,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30881 states. [2023-12-02 14:25:53,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30881 to 26168. [2023-12-02 14:25:53,666 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26168 states, 22450 states have (on average 1.3207126948775056) internal successors, (29650), 22461 states have internal predecessors, (29650), 2128 states have call successors, (2128), 1634 states have call predecessors, (2128), 1588 states have return successors, (2336), 2073 states have call predecessors, (2336), 2128 states have call successors, (2336) [2023-12-02 14:25:53,706 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26168 states to 26168 states and 34114 transitions. [2023-12-02 14:25:53,707 INFO L78 Accepts]: Start accepts. Automaton has 26168 states and 34114 transitions. Word has length 136 [2023-12-02 14:25:53,707 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:25:53,707 INFO L495 AbstractCegarLoop]: Abstraction has 26168 states and 34114 transitions. [2023-12-02 14:25:53,707 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 14.666666666666666) internal successors, (88), 6 states have internal predecessors, (88), 3 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) [2023-12-02 14:25:53,708 INFO L276 IsEmpty]: Start isEmpty. Operand 26168 states and 34114 transitions. [2023-12-02 14:25:53,721 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2023-12-02 14:25:53,721 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:25:53,721 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 14:25:53,726 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2023-12-02 14:25:53,922 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:25:53,922 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:25:53,922 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:25:53,922 INFO L85 PathProgramCache]: Analyzing trace with hash -471094245, now seen corresponding path program 1 times [2023-12-02 14:25:53,923 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:25:53,923 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1743299612] [2023-12-02 14:25:53,923 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:25:53,923 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:25:53,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:25:54,042 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 22 proven. 32 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2023-12-02 14:25:54,042 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:25:54,042 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1743299612] [2023-12-02 14:25:54,042 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1743299612] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:25:54,042 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [800492841] [2023-12-02 14:25:54,042 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:25:54,043 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:25:54,043 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:25:54,043 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:25:54,045 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2023-12-02 14:25:54,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:25:54,173 INFO L262 TraceCheckSpWp]: Trace formula consists of 664 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 14:25:54,175 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:25:54,202 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 78 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-12-02 14:25:54,203 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 14:25:54,203 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [800492841] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:25:54,203 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 14:25:54,203 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-12-02 14:25:54,203 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2132500388] [2023-12-02 14:25:54,203 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:25:54,204 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 14:25:54,204 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:25:54,204 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 14:25:54,204 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 14:25:54,204 INFO L87 Difference]: Start difference. First operand 26168 states and 34114 transitions. Second operand has 3 states, 3 states have (on average 35.333333333333336) internal successors, (106), 3 states have internal predecessors, (106), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 14:25:55,917 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:25:55,917 INFO L93 Difference]: Finished difference Result 43207 states and 56492 transitions. [2023-12-02 14:25:55,918 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 14:25:55,918 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 35.333333333333336) internal successors, (106), 3 states have internal predecessors, (106), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 136 [2023-12-02 14:25:55,918 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:25:55,965 INFO L225 Difference]: With dead ends: 43207 [2023-12-02 14:25:55,965 INFO L226 Difference]: Without dead ends: 25958 [2023-12-02 14:25:55,985 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 138 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 14:25:55,985 INFO L413 NwaCegarLoop]: 3250 mSDtfsCounter, 106 mSDsluCounter, 3165 mSDsCounter, 0 mSdLazyCounter, 491 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 106 SdHoareTripleChecker+Valid, 6415 SdHoareTripleChecker+Invalid, 493 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 491 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 14:25:55,985 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [106 Valid, 6415 Invalid, 493 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 491 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 14:25:56,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25958 states. [2023-12-02 14:25:57,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25958 to 25746. [2023-12-02 14:25:57,220 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25746 states, 22068 states have (on average 1.302021025919884) internal successors, (28733), 22079 states have internal predecessors, (28733), 2106 states have call successors, (2106), 1616 states have call predecessors, (2106), 1570 states have return successors, (2314), 2051 states have call predecessors, (2314), 2106 states have call successors, (2314) [2023-12-02 14:25:57,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25746 states to 25746 states and 33153 transitions. [2023-12-02 14:25:57,261 INFO L78 Accepts]: Start accepts. Automaton has 25746 states and 33153 transitions. Word has length 136 [2023-12-02 14:25:57,262 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:25:57,262 INFO L495 AbstractCegarLoop]: Abstraction has 25746 states and 33153 transitions. [2023-12-02 14:25:57,262 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 35.333333333333336) internal successors, (106), 3 states have internal predecessors, (106), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 14:25:57,262 INFO L276 IsEmpty]: Start isEmpty. Operand 25746 states and 33153 transitions. [2023-12-02 14:25:57,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2023-12-02 14:25:57,275 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:25:57,275 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 14:25:57,280 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2023-12-02 14:25:57,476 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:25:57,476 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:25:57,476 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:25:57,476 INFO L85 PathProgramCache]: Analyzing trace with hash -337344779, now seen corresponding path program 1 times [2023-12-02 14:25:57,477 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:25:57,477 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1549281879] [2023-12-02 14:25:57,477 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:25:57,477 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:25:57,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:25:57,748 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 12 proven. 32 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2023-12-02 14:25:57,748 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:25:57,749 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1549281879] [2023-12-02 14:25:57,749 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1549281879] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:25:57,749 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [86468221] [2023-12-02 14:25:57,749 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:25:57,749 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:25:57,749 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:25:57,750 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:25:57,754 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2023-12-02 14:25:57,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:25:57,886 INFO L262 TraceCheckSpWp]: Trace formula consists of 735 conjuncts, 17 conjunts are in the unsatisfiable core [2023-12-02 14:25:57,889 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:25:57,974 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 68 proven. 0 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2023-12-02 14:25:57,974 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 14:25:57,975 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [86468221] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:25:57,975 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 14:25:57,975 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [6] total 12 [2023-12-02 14:25:57,975 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1965299350] [2023-12-02 14:25:57,975 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:25:57,975 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-12-02 14:25:57,975 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:25:57,976 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-12-02 14:25:57,976 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2023-12-02 14:25:57,976 INFO L87 Difference]: Start difference. First operand 25746 states and 33153 transitions. Second operand has 8 states, 7 states have (on average 12.714285714285714) internal successors, (89), 7 states have internal predecessors, (89), 3 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) [2023-12-02 14:26:00,036 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:26:00,036 INFO L93 Difference]: Finished difference Result 35812 states and 45997 transitions. [2023-12-02 14:26:00,036 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-12-02 14:26:00,036 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 12.714285714285714) internal successors, (89), 7 states have internal predecessors, (89), 3 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) Word has length 137 [2023-12-02 14:26:00,036 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:26:00,080 INFO L225 Difference]: With dead ends: 35812 [2023-12-02 14:26:00,081 INFO L226 Difference]: Without dead ends: 27428 [2023-12-02 14:26:00,093 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 142 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=56, Invalid=184, Unknown=0, NotChecked=0, Total=240 [2023-12-02 14:26:00,094 INFO L413 NwaCegarLoop]: 3307 mSDtfsCounter, 218 mSDsluCounter, 13114 mSDsCounter, 0 mSdLazyCounter, 1408 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 222 SdHoareTripleChecker+Valid, 16421 SdHoareTripleChecker+Invalid, 1416 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 1408 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-12-02 14:26:00,094 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [222 Valid, 16421 Invalid, 1416 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 1408 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-12-02 14:26:00,112 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27428 states. [2023-12-02 14:26:01,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27428 to 25746. [2023-12-02 14:26:01,221 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25746 states, 22068 states have (on average 1.3009787928221859) internal successors, (28710), 22079 states have internal predecessors, (28710), 2106 states have call successors, (2106), 1616 states have call predecessors, (2106), 1570 states have return successors, (2314), 2051 states have call predecessors, (2314), 2106 states have call successors, (2314) [2023-12-02 14:26:01,260 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25746 states to 25746 states and 33130 transitions. [2023-12-02 14:26:01,261 INFO L78 Accepts]: Start accepts. Automaton has 25746 states and 33130 transitions. Word has length 137 [2023-12-02 14:26:01,261 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:26:01,261 INFO L495 AbstractCegarLoop]: Abstraction has 25746 states and 33130 transitions. [2023-12-02 14:26:01,261 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 12.714285714285714) internal successors, (89), 7 states have internal predecessors, (89), 3 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) [2023-12-02 14:26:01,261 INFO L276 IsEmpty]: Start isEmpty. Operand 25746 states and 33130 transitions. [2023-12-02 14:26:01,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2023-12-02 14:26:01,275 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:26:01,275 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 14:26:01,280 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2023-12-02 14:26:01,475 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:26:01,475 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:26:01,476 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:26:01,476 INFO L85 PathProgramCache]: Analyzing trace with hash 1254443826, now seen corresponding path program 1 times [2023-12-02 14:26:01,476 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:26:01,476 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1006573787] [2023-12-02 14:26:01,476 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:26:01,476 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:26:01,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:26:01,647 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 20 proven. 30 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2023-12-02 14:26:01,647 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:26:01,647 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1006573787] [2023-12-02 14:26:01,647 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1006573787] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:26:01,647 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [758093043] [2023-12-02 14:26:01,647 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:26:01,647 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:26:01,648 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:26:01,648 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:26:01,649 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2023-12-02 14:26:01,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:26:01,794 INFO L262 TraceCheckSpWp]: Trace formula consists of 664 conjuncts, 8 conjunts are in the unsatisfiable core [2023-12-02 14:26:01,796 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:26:01,826 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 42 proven. 0 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2023-12-02 14:26:01,826 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 14:26:01,827 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [758093043] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:26:01,827 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 14:26:01,827 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 8 [2023-12-02 14:26:01,827 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [228061360] [2023-12-02 14:26:01,827 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:26:01,827 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 14:26:01,828 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:26:01,828 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 14:26:01,828 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2023-12-02 14:26:01,828 INFO L87 Difference]: Start difference. First operand 25746 states and 33130 transitions. Second operand has 4 states, 4 states have (on average 21.5) internal successors, (86), 4 states have internal predecessors, (86), 2 states have call successors, (9), 2 states have call predecessors, (9), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) [2023-12-02 14:26:03,530 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:26:03,530 INFO L93 Difference]: Finished difference Result 47468 states and 60204 transitions. [2023-12-02 14:26:03,530 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-12-02 14:26:03,531 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 21.5) internal successors, (86), 4 states have internal predecessors, (86), 2 states have call successors, (9), 2 states have call predecessors, (9), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) Word has length 134 [2023-12-02 14:26:03,531 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:26:03,584 INFO L225 Difference]: With dead ends: 47468 [2023-12-02 14:26:03,584 INFO L226 Difference]: Without dead ends: 31680 [2023-12-02 14:26:03,606 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 135 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2023-12-02 14:26:03,606 INFO L413 NwaCegarLoop]: 3220 mSDtfsCounter, 3386 mSDsluCounter, 3331 mSDsCounter, 0 mSdLazyCounter, 529 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3386 SdHoareTripleChecker+Valid, 6551 SdHoareTripleChecker+Invalid, 532 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 529 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 14:26:03,607 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3386 Valid, 6551 Invalid, 532 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 529 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 14:26:03,629 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31680 states. [2023-12-02 14:26:05,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31680 to 30649. [2023-12-02 14:26:05,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30649 states, 26041 states have (on average 1.283476056987059) internal successors, (33423), 26048 states have internal predecessors, (33423), 2620 states have call successors, (2620), 2014 states have call predecessors, (2620), 1986 states have return successors, (3244), 2587 states have call predecessors, (3244), 2620 states have call successors, (3244) [2023-12-02 14:26:05,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30649 states to 30649 states and 39287 transitions. [2023-12-02 14:26:05,102 INFO L78 Accepts]: Start accepts. Automaton has 30649 states and 39287 transitions. Word has length 134 [2023-12-02 14:26:05,102 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:26:05,102 INFO L495 AbstractCegarLoop]: Abstraction has 30649 states and 39287 transitions. [2023-12-02 14:26:05,102 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 21.5) internal successors, (86), 4 states have internal predecessors, (86), 2 states have call successors, (9), 2 states have call predecessors, (9), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) [2023-12-02 14:26:05,102 INFO L276 IsEmpty]: Start isEmpty. Operand 30649 states and 39287 transitions. [2023-12-02 14:26:05,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2023-12-02 14:26:05,118 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:26:05,118 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:26:05,123 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Ended with exit code 0 [2023-12-02 14:26:05,319 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:26:05,319 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:26:05,319 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:26:05,319 INFO L85 PathProgramCache]: Analyzing trace with hash -1965822583, now seen corresponding path program 1 times [2023-12-02 14:26:05,319 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:26:05,320 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1999386313] [2023-12-02 14:26:05,320 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:26:05,320 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:26:05,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:26:05,435 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 22 proven. 32 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2023-12-02 14:26:05,435 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:26:05,435 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1999386313] [2023-12-02 14:26:05,435 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1999386313] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:26:05,435 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [387671530] [2023-12-02 14:26:05,436 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:26:05,436 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:26:05,436 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:26:05,437 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:26:05,437 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2023-12-02 14:26:05,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:26:05,554 INFO L262 TraceCheckSpWp]: Trace formula consists of 657 conjuncts, 9 conjunts are in the unsatisfiable core [2023-12-02 14:26:05,558 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:26:05,616 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 58 proven. 0 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2023-12-02 14:26:05,616 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 14:26:05,616 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [387671530] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:26:05,616 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 14:26:05,617 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 7 [2023-12-02 14:26:05,617 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1944713469] [2023-12-02 14:26:05,617 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:26:05,617 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 14:26:05,617 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:26:05,618 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 14:26:05,618 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2023-12-02 14:26:05,618 INFO L87 Difference]: Start difference. First operand 30649 states and 39287 transitions. Second operand has 6 states, 6 states have (on average 14.833333333333334) internal successors, (89), 6 states have internal predecessors, (89), 3 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 14:26:08,230 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:26:08,230 INFO L93 Difference]: Finished difference Result 71590 states and 89985 transitions. [2023-12-02 14:26:08,231 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-12-02 14:26:08,231 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 14.833333333333334) internal successors, (89), 6 states have internal predecessors, (89), 3 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 134 [2023-12-02 14:26:08,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:26:08,299 INFO L225 Difference]: With dead ends: 71590 [2023-12-02 14:26:08,299 INFO L226 Difference]: Without dead ends: 42689 [2023-12-02 14:26:08,326 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 136 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2023-12-02 14:26:08,327 INFO L413 NwaCegarLoop]: 3172 mSDtfsCounter, 6934 mSDsluCounter, 6259 mSDsCounter, 0 mSdLazyCounter, 754 mSolverCounterSat, 134 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6947 SdHoareTripleChecker+Valid, 9431 SdHoareTripleChecker+Invalid, 888 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 134 IncrementalHoareTripleChecker+Valid, 754 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-12-02 14:26:08,327 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6947 Valid, 9431 Invalid, 888 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [134 Valid, 754 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-12-02 14:26:08,355 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42689 states. [2023-12-02 14:26:10,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42689 to 42671. [2023-12-02 14:26:10,487 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42671 states, 36041 states have (on average 1.2569018617685415) internal successors, (45300), 36062 states have internal predecessors, (45300), 3774 states have call successors, (3774), 2902 states have call predecessors, (3774), 2854 states have return successors, (4618), 3707 states have call predecessors, (4618), 3774 states have call successors, (4618) [2023-12-02 14:26:10,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42671 states to 42671 states and 53692 transitions. [2023-12-02 14:26:10,555 INFO L78 Accepts]: Start accepts. Automaton has 42671 states and 53692 transitions. Word has length 134 [2023-12-02 14:26:10,555 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:26:10,555 INFO L495 AbstractCegarLoop]: Abstraction has 42671 states and 53692 transitions. [2023-12-02 14:26:10,555 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 14.833333333333334) internal successors, (89), 6 states have internal predecessors, (89), 3 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 14:26:10,555 INFO L276 IsEmpty]: Start isEmpty. Operand 42671 states and 53692 transitions. [2023-12-02 14:26:10,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2023-12-02 14:26:10,576 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:26:10,576 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 14:26:10,581 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2023-12-02 14:26:10,776 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:26:10,777 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:26:10,777 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:26:10,777 INFO L85 PathProgramCache]: Analyzing trace with hash 1718850935, now seen corresponding path program 1 times [2023-12-02 14:26:10,777 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:26:10,777 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [309761845] [2023-12-02 14:26:10,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:26:10,778 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:26:10,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:26:10,868 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 26 proven. 25 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2023-12-02 14:26:10,868 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:26:10,868 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [309761845] [2023-12-02 14:26:10,868 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [309761845] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:26:10,868 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1894069599] [2023-12-02 14:26:10,868 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:26:10,868 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:26:10,869 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:26:10,869 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:26:10,870 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2023-12-02 14:26:10,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:26:10,992 INFO L262 TraceCheckSpWp]: Trace formula consists of 677 conjuncts, 5 conjunts are in the unsatisfiable core [2023-12-02 14:26:10,994 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:26:11,015 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 35 proven. 0 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2023-12-02 14:26:11,016 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 14:26:11,016 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1894069599] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:26:11,016 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 14:26:11,016 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 7 [2023-12-02 14:26:11,016 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1601018475] [2023-12-02 14:26:11,016 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:26:11,017 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 14:26:11,017 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:26:11,017 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 14:26:11,017 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2023-12-02 14:26:11,017 INFO L87 Difference]: Start difference. First operand 42671 states and 53692 transitions. Second operand has 4 states, 4 states have (on average 20.75) internal successors, (83), 4 states have internal predecessors, (83), 2 states have call successors, (9), 2 states have call predecessors, (9), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) [2023-12-02 14:26:13,881 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:26:13,881 INFO L93 Difference]: Finished difference Result 83512 states and 104948 transitions. [2023-12-02 14:26:13,881 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-12-02 14:26:13,881 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 20.75) internal successors, (83), 4 states have internal predecessors, (83), 2 states have call successors, (9), 2 states have call predecessors, (9), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) Word has length 137 [2023-12-02 14:26:13,882 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:26:13,985 INFO L225 Difference]: With dead ends: 83512 [2023-12-02 14:26:13,985 INFO L226 Difference]: Without dead ends: 54402 [2023-12-02 14:26:14,023 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 139 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2023-12-02 14:26:14,023 INFO L413 NwaCegarLoop]: 3234 mSDtfsCounter, 3389 mSDsluCounter, 3345 mSDsCounter, 0 mSdLazyCounter, 533 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3389 SdHoareTripleChecker+Valid, 6579 SdHoareTripleChecker+Invalid, 536 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 533 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 14:26:14,024 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3389 Valid, 6579 Invalid, 536 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 533 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 14:26:14,061 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54402 states. [2023-12-02 14:26:16,924 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54402 to 52417. [2023-12-02 14:26:16,949 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52417 states, 43991 states have (on average 1.2472096565206519) internal successors, (54866), 44044 states have internal predecessors, (54866), 4798 states have call successors, (4798), 3678 states have call predecessors, (4798), 3626 states have return successors, (6776), 4695 states have call predecessors, (6776), 4798 states have call successors, (6776) [2023-12-02 14:26:17,041 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52417 states to 52417 states and 66440 transitions. [2023-12-02 14:26:17,043 INFO L78 Accepts]: Start accepts. Automaton has 52417 states and 66440 transitions. Word has length 137 [2023-12-02 14:26:17,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:26:17,044 INFO L495 AbstractCegarLoop]: Abstraction has 52417 states and 66440 transitions. [2023-12-02 14:26:17,044 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 20.75) internal successors, (83), 4 states have internal predecessors, (83), 2 states have call successors, (9), 2 states have call predecessors, (9), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) [2023-12-02 14:26:17,044 INFO L276 IsEmpty]: Start isEmpty. Operand 52417 states and 66440 transitions. [2023-12-02 14:26:17,069 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2023-12-02 14:26:17,069 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:26:17,069 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 14:26:17,074 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2023-12-02 14:26:17,269 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2023-12-02 14:26:17,270 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:26:17,270 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:26:17,270 INFO L85 PathProgramCache]: Analyzing trace with hash 379081111, now seen corresponding path program 1 times [2023-12-02 14:26:17,270 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:26:17,270 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1284297046] [2023-12-02 14:26:17,270 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:26:17,271 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:26:17,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:26:17,310 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 38 proven. 8 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2023-12-02 14:26:17,310 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:26:17,310 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1284297046] [2023-12-02 14:26:17,310 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1284297046] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:26:17,310 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2029568802] [2023-12-02 14:26:17,311 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:26:17,311 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:26:17,311 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:26:17,312 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:26:17,312 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2023-12-02 14:26:17,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:26:17,501 INFO L262 TraceCheckSpWp]: Trace formula consists of 671 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 14:26:17,503 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:26:17,529 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 80 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-12-02 14:26:17,529 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 14:26:17,529 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2029568802] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:26:17,529 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 14:26:17,529 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 4 [2023-12-02 14:26:17,529 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1122752101] [2023-12-02 14:26:17,530 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:26:17,530 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 14:26:17,530 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:26:17,530 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 14:26:17,530 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 14:26:17,531 INFO L87 Difference]: Start difference. First operand 52417 states and 66440 transitions. Second operand has 3 states, 3 states have (on average 36.333333333333336) internal successors, (109), 3 states have internal predecessors, (109), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 14:26:20,726 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:26:20,726 INFO L93 Difference]: Finished difference Result 91256 states and 117672 transitions. [2023-12-02 14:26:20,727 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 14:26:20,727 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 36.333333333333336) internal successors, (109), 3 states have internal predecessors, (109), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 137 [2023-12-02 14:26:20,727 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:26:20,823 INFO L225 Difference]: With dead ends: 91256 [2023-12-02 14:26:20,824 INFO L226 Difference]: Without dead ends: 52400 [2023-12-02 14:26:20,867 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 138 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 14:26:20,867 INFO L413 NwaCegarLoop]: 3265 mSDtfsCounter, 104 mSDsluCounter, 3165 mSDsCounter, 0 mSdLazyCounter, 495 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 104 SdHoareTripleChecker+Valid, 6430 SdHoareTripleChecker+Invalid, 497 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 495 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 14:26:20,868 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [104 Valid, 6430 Invalid, 497 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 495 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 14:26:20,900 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52400 states. [2023-12-02 14:26:24,303 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52400 to 52121. [2023-12-02 14:26:24,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52121 states, 43703 states have (on average 1.2229595222295953) internal successors, (53447), 43756 states have internal predecessors, (53447), 4794 states have call successors, (4794), 3674 states have call predecessors, (4794), 3622 states have return successors, (6772), 4691 states have call predecessors, (6772), 4794 states have call successors, (6772) [2023-12-02 14:26:24,409 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52121 states to 52121 states and 65013 transitions. [2023-12-02 14:26:24,411 INFO L78 Accepts]: Start accepts. Automaton has 52121 states and 65013 transitions. Word has length 137 [2023-12-02 14:26:24,411 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:26:24,411 INFO L495 AbstractCegarLoop]: Abstraction has 52121 states and 65013 transitions. [2023-12-02 14:26:24,412 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 36.333333333333336) internal successors, (109), 3 states have internal predecessors, (109), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 14:26:24,412 INFO L276 IsEmpty]: Start isEmpty. Operand 52121 states and 65013 transitions. [2023-12-02 14:26:24,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2023-12-02 14:26:24,436 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:26:24,436 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:26:24,440 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Ended with exit code 0 [2023-12-02 14:26:24,636 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2023-12-02 14:26:24,636 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:26:24,637 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:26:24,637 INFO L85 PathProgramCache]: Analyzing trace with hash -770101074, now seen corresponding path program 1 times [2023-12-02 14:26:24,637 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:26:24,637 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [317270677] [2023-12-02 14:26:24,637 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:26:24,637 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:26:24,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:26:25,025 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 33 proven. 7 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2023-12-02 14:26:25,025 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:26:25,025 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [317270677] [2023-12-02 14:26:25,025 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [317270677] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:26:25,025 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [109023220] [2023-12-02 14:26:25,025 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:26:25,025 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:26:25,026 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:26:25,026 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:26:25,027 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2023-12-02 14:26:25,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:26:25,137 INFO L262 TraceCheckSpWp]: Trace formula consists of 670 conjuncts, 9 conjunts are in the unsatisfiable core [2023-12-02 14:26:25,139 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:26:25,261 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 64 proven. 0 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2023-12-02 14:26:25,261 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 14:26:25,261 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [109023220] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:26:25,262 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 14:26:25,262 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [11] total 15 [2023-12-02 14:26:25,262 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [439228783] [2023-12-02 14:26:25,262 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:26:25,262 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 14:26:25,262 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:26:25,263 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 14:26:25,263 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=162, Unknown=0, NotChecked=0, Total=210 [2023-12-02 14:26:25,263 INFO L87 Difference]: Start difference. First operand 52121 states and 65013 transitions. Second operand has 6 states, 4 states have (on average 23.75) internal successors, (95), 4 states have internal predecessors, (95), 2 states have call successors, (10), 3 states have call predecessors, (10), 4 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2023-12-02 14:26:28,785 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:26:28,785 INFO L93 Difference]: Finished difference Result 83026 states and 103604 transitions. [2023-12-02 14:26:28,786 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-12-02 14:26:28,786 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 4 states have (on average 23.75) internal successors, (95), 4 states have internal predecessors, (95), 2 states have call successors, (10), 3 states have call predecessors, (10), 4 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) Word has length 137 [2023-12-02 14:26:28,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:26:28,876 INFO L225 Difference]: With dead ends: 83026 [2023-12-02 14:26:28,877 INFO L226 Difference]: Without dead ends: 45406 [2023-12-02 14:26:28,922 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 136 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=55, Invalid=185, Unknown=0, NotChecked=0, Total=240 [2023-12-02 14:26:28,923 INFO L413 NwaCegarLoop]: 3132 mSDtfsCounter, 3445 mSDsluCounter, 9334 mSDsCounter, 0 mSdLazyCounter, 1157 mSolverCounterSat, 50 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3455 SdHoareTripleChecker+Valid, 12466 SdHoareTripleChecker+Invalid, 1207 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 50 IncrementalHoareTripleChecker+Valid, 1157 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-12-02 14:26:28,923 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3455 Valid, 12466 Invalid, 1207 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [50 Valid, 1157 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-12-02 14:26:28,954 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45406 states. [2023-12-02 14:26:31,766 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45406 to 44114. [2023-12-02 14:26:31,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44114 states, 37302 states have (on average 1.2151359176451664) internal successors, (45327), 37347 states have internal predecessors, (45327), 3806 states have call successors, (3806), 3004 states have call predecessors, (3806), 3004 states have return successors, (4612), 3763 states have call predecessors, (4612), 3806 states have call successors, (4612) [2023-12-02 14:26:31,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44114 states to 44114 states and 53745 transitions. [2023-12-02 14:26:31,850 INFO L78 Accepts]: Start accepts. Automaton has 44114 states and 53745 transitions. Word has length 137 [2023-12-02 14:26:31,851 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:26:31,851 INFO L495 AbstractCegarLoop]: Abstraction has 44114 states and 53745 transitions. [2023-12-02 14:26:31,851 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 4 states have (on average 23.75) internal successors, (95), 4 states have internal predecessors, (95), 2 states have call successors, (10), 3 states have call predecessors, (10), 4 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2023-12-02 14:26:31,851 INFO L276 IsEmpty]: Start isEmpty. Operand 44114 states and 53745 transitions. [2023-12-02 14:26:31,870 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2023-12-02 14:26:31,870 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:26:31,871 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 14:26:31,875 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Ended with exit code 0 [2023-12-02 14:26:32,071 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2023-12-02 14:26:32,071 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:26:32,072 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:26:32,072 INFO L85 PathProgramCache]: Analyzing trace with hash 695869245, now seen corresponding path program 1 times [2023-12-02 14:26:32,072 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:26:32,072 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [791202511] [2023-12-02 14:26:32,072 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:26:32,072 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:26:32,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:26:32,277 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 17 proven. 31 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2023-12-02 14:26:32,277 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:26:32,277 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [791202511] [2023-12-02 14:26:32,277 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [791202511] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:26:32,277 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1332068350] [2023-12-02 14:26:32,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:26:32,278 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:26:32,278 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:26:32,279 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:26:32,288 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2023-12-02 14:26:32,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:26:32,459 INFO L262 TraceCheckSpWp]: Trace formula consists of 751 conjuncts, 18 conjunts are in the unsatisfiable core [2023-12-02 14:26:32,462 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:26:32,638 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 66 proven. 0 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2023-12-02 14:26:32,638 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 14:26:32,638 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1332068350] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:26:32,639 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 14:26:32,639 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [8] total 15 [2023-12-02 14:26:32,639 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1698201575] [2023-12-02 14:26:32,639 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:26:32,639 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-12-02 14:26:32,640 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:26:32,640 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-12-02 14:26:32,640 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2023-12-02 14:26:32,641 INFO L87 Difference]: Start difference. First operand 44114 states and 53745 transitions. Second operand has 9 states, 8 states have (on average 11.625) internal successors, (93), 8 states have internal predecessors, (93), 3 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) [2023-12-02 14:26:36,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:26:36,050 INFO L93 Difference]: Finished difference Result 56723 states and 69368 transitions. [2023-12-02 14:26:36,050 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-12-02 14:26:36,050 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 11.625) internal successors, (93), 8 states have internal predecessors, (93), 3 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) Word has length 141 [2023-12-02 14:26:36,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:26:36,142 INFO L225 Difference]: With dead ends: 56723 [2023-12-02 14:26:36,143 INFO L226 Difference]: Without dead ends: 46144 [2023-12-02 14:26:36,161 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 138 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=83, Invalid=259, Unknown=0, NotChecked=0, Total=342 [2023-12-02 14:26:36,162 INFO L413 NwaCegarLoop]: 3313 mSDtfsCounter, 235 mSDsluCounter, 13114 mSDsCounter, 0 mSdLazyCounter, 1414 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 238 SdHoareTripleChecker+Valid, 16427 SdHoareTripleChecker+Invalid, 1424 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1414 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-12-02 14:26:36,162 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [238 Valid, 16427 Invalid, 1424 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1414 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-12-02 14:26:36,189 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46144 states. [2023-12-02 14:26:38,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46144 to 44283. [2023-12-02 14:26:38,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44283 states, 37447 states have (on average 1.2149704916281678) internal successors, (45497), 37492 states have internal predecessors, (45497), 3818 states have call successors, (3818), 3016 states have call predecessors, (3818), 3016 states have return successors, (4624), 3775 states have call predecessors, (4624), 3818 states have call successors, (4624) [2023-12-02 14:26:38,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44283 states to 44283 states and 53939 transitions. [2023-12-02 14:26:38,858 INFO L78 Accepts]: Start accepts. Automaton has 44283 states and 53939 transitions. Word has length 141 [2023-12-02 14:26:38,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:26:38,859 INFO L495 AbstractCegarLoop]: Abstraction has 44283 states and 53939 transitions. [2023-12-02 14:26:38,859 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 11.625) internal successors, (93), 8 states have internal predecessors, (93), 3 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) [2023-12-02 14:26:38,859 INFO L276 IsEmpty]: Start isEmpty. Operand 44283 states and 53939 transitions. [2023-12-02 14:26:38,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2023-12-02 14:26:38,884 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:26:38,885 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:26:38,890 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Ended with exit code 0 [2023-12-02 14:26:39,085 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:26:39,085 INFO L420 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:26:39,086 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:26:39,086 INFO L85 PathProgramCache]: Analyzing trace with hash -1301126637, now seen corresponding path program 1 times [2023-12-02 14:26:39,086 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:26:39,086 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [226375329] [2023-12-02 14:26:39,086 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:26:39,086 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:26:39,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:26:39,189 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 54 proven. 4 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2023-12-02 14:26:39,189 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:26:39,189 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [226375329] [2023-12-02 14:26:39,189 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [226375329] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:26:39,189 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [110980355] [2023-12-02 14:26:39,190 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:26:39,190 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:26:39,190 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:26:39,191 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:26:39,192 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2023-12-02 14:26:39,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:26:39,332 INFO L262 TraceCheckSpWp]: Trace formula consists of 669 conjuncts, 6 conjunts are in the unsatisfiable core [2023-12-02 14:26:39,334 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:26:39,407 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 83 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-12-02 14:26:39,408 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 14:26:39,408 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [110980355] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:26:39,408 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 14:26:39,408 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 7 [2023-12-02 14:26:39,408 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1954944982] [2023-12-02 14:26:39,408 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:26:39,408 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 14:26:39,408 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:26:39,409 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 14:26:39,409 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2023-12-02 14:26:39,409 INFO L87 Difference]: Start difference. First operand 44283 states and 53939 transitions. Second operand has 4 states, 4 states have (on average 27.75) internal successors, (111), 4 states have internal predecessors, (111), 4 states have call successors, (10), 4 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 4 states have call successors, (10) [2023-12-02 14:26:42,882 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:26:42,882 INFO L93 Difference]: Finished difference Result 80417 states and 97704 transitions. [2023-12-02 14:26:42,882 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 14:26:42,883 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 27.75) internal successors, (111), 4 states have internal predecessors, (111), 4 states have call successors, (10), 4 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 4 states have call successors, (10) Word has length 138 [2023-12-02 14:26:42,883 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:26:42,997 INFO L225 Difference]: With dead ends: 80417 [2023-12-02 14:26:42,997 INFO L226 Difference]: Without dead ends: 57267 [2023-12-02 14:26:43,031 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 138 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2023-12-02 14:26:43,032 INFO L413 NwaCegarLoop]: 3259 mSDtfsCounter, 6722 mSDsluCounter, 114 mSDsCounter, 0 mSdLazyCounter, 317 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6722 SdHoareTripleChecker+Valid, 3373 SdHoareTripleChecker+Invalid, 331 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 317 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 14:26:43,032 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6722 Valid, 3373 Invalid, 331 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 317 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 14:26:43,075 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57267 states. [2023-12-02 14:26:46,147 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57267 to 54717. [2023-12-02 14:26:46,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54717 states, 46820 states have (on average 1.1925672789406236) internal successors, (55836), 46985 states have internal predecessors, (55836), 4202 states have call successors, (4202), 3533 states have call predecessors, (4202), 3693 states have return successors, (5309), 4199 states have call predecessors, (5309), 4202 states have call successors, (5309) [2023-12-02 14:26:46,258 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54717 states to 54717 states and 65347 transitions. [2023-12-02 14:26:46,259 INFO L78 Accepts]: Start accepts. Automaton has 54717 states and 65347 transitions. Word has length 138 [2023-12-02 14:26:46,259 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:26:46,259 INFO L495 AbstractCegarLoop]: Abstraction has 54717 states and 65347 transitions. [2023-12-02 14:26:46,259 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 27.75) internal successors, (111), 4 states have internal predecessors, (111), 4 states have call successors, (10), 4 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 4 states have call successors, (10) [2023-12-02 14:26:46,260 INFO L276 IsEmpty]: Start isEmpty. Operand 54717 states and 65347 transitions. [2023-12-02 14:26:46,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2023-12-02 14:26:46,282 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:26:46,282 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:26:46,287 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Ended with exit code 0 [2023-12-02 14:26:46,482 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:26:46,483 INFO L420 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:26:46,484 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:26:46,484 INFO L85 PathProgramCache]: Analyzing trace with hash -225730637, now seen corresponding path program 1 times [2023-12-02 14:26:46,484 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:26:46,484 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [799763682] [2023-12-02 14:26:46,485 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:26:46,485 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:26:46,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:26:46,644 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 65 proven. 0 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2023-12-02 14:26:46,644 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:26:46,645 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [799763682] [2023-12-02 14:26:46,645 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [799763682] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:26:46,645 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 14:26:46,645 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-12-02 14:26:46,645 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [802975790] [2023-12-02 14:26:46,645 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:26:46,646 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 14:26:46,646 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:26:46,646 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 14:26:46,646 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-12-02 14:26:46,646 INFO L87 Difference]: Start difference. First operand 54717 states and 65347 transitions. Second operand has 5 states, 5 states have (on average 19.4) internal successors, (97), 5 states have internal predecessors, (97), 3 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 14:26:51,285 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:26:51,285 INFO L93 Difference]: Finished difference Result 103428 states and 123061 transitions. [2023-12-02 14:26:51,285 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-12-02 14:26:51,285 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 19.4) internal successors, (97), 5 states have internal predecessors, (97), 3 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 139 [2023-12-02 14:26:51,286 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:26:51,408 INFO L225 Difference]: With dead ends: 103428 [2023-12-02 14:26:51,408 INFO L226 Difference]: Without dead ends: 71479 [2023-12-02 14:26:51,441 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2023-12-02 14:26:51,442 INFO L413 NwaCegarLoop]: 3242 mSDtfsCounter, 102 mSDsluCounter, 6366 mSDsCounter, 0 mSdLazyCounter, 851 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 107 SdHoareTripleChecker+Valid, 9608 SdHoareTripleChecker+Invalid, 879 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 851 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-12-02 14:26:51,442 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [107 Valid, 9608 Invalid, 879 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 851 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-12-02 14:26:51,488 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71479 states. [2023-12-02 14:26:55,804 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71479 to 70990. [2023-12-02 14:26:55,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70990 states, 60219 states have (on average 1.178432056327737) internal successors, (70964), 60356 states have internal predecessors, (70964), 5799 states have call successors, (5799), 4802 states have call predecessors, (5799), 4970 states have return successors, (7739), 5832 states have call predecessors, (7739), 5799 states have call successors, (7739) [2023-12-02 14:26:56,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70990 states to 70990 states and 84502 transitions. [2023-12-02 14:26:56,048 INFO L78 Accepts]: Start accepts. Automaton has 70990 states and 84502 transitions. Word has length 139 [2023-12-02 14:26:56,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:26:56,048 INFO L495 AbstractCegarLoop]: Abstraction has 70990 states and 84502 transitions. [2023-12-02 14:26:56,048 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 19.4) internal successors, (97), 5 states have internal predecessors, (97), 3 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 14:26:56,049 INFO L276 IsEmpty]: Start isEmpty. Operand 70990 states and 84502 transitions. [2023-12-02 14:26:56,072 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2023-12-02 14:26:56,072 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:26:56,072 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 14:26:56,072 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2023-12-02 14:26:56,072 INFO L420 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:26:56,073 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:26:56,073 INFO L85 PathProgramCache]: Analyzing trace with hash 435407080, now seen corresponding path program 1 times [2023-12-02 14:26:56,073 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:26:56,073 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [845721878] [2023-12-02 14:26:56,073 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:26:56,073 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:26:56,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:26:56,266 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 17 proven. 31 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2023-12-02 14:26:56,266 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:26:56,266 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [845721878] [2023-12-02 14:26:56,266 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [845721878] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:26:56,266 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [852092191] [2023-12-02 14:26:56,266 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:26:56,267 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:26:56,267 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:26:56,267 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:26:56,268 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2023-12-02 14:26:56,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:26:56,393 INFO L262 TraceCheckSpWp]: Trace formula consists of 760 conjuncts, 19 conjunts are in the unsatisfiable core [2023-12-02 14:26:56,396 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:26:56,573 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 66 proven. 0 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2023-12-02 14:26:56,573 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 14:26:56,573 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [852092191] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:26:56,573 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 14:26:56,573 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [8] total 16 [2023-12-02 14:26:56,573 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1029592969] [2023-12-02 14:26:56,573 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:26:56,574 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-12-02 14:26:56,574 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:26:56,574 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-12-02 14:26:56,575 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=190, Unknown=0, NotChecked=0, Total=240 [2023-12-02 14:26:56,575 INFO L87 Difference]: Start difference. First operand 70990 states and 84502 transitions. Second operand has 10 states, 9 states have (on average 10.666666666666666) internal successors, (96), 9 states have internal predecessors, (96), 3 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) [2023-12-02 14:27:01,460 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:27:01,460 INFO L93 Difference]: Finished difference Result 89155 states and 106346 transitions. [2023-12-02 14:27:01,461 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-12-02 14:27:01,461 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 10.666666666666666) internal successors, (96), 9 states have internal predecessors, (96), 3 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) Word has length 144 [2023-12-02 14:27:01,461 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:27:01,609 INFO L225 Difference]: With dead ends: 89155 [2023-12-02 14:27:01,610 INFO L226 Difference]: Without dead ends: 72660 [2023-12-02 14:27:01,643 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 140 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=94, Invalid=286, Unknown=0, NotChecked=0, Total=380 [2023-12-02 14:27:01,644 INFO L413 NwaCegarLoop]: 3306 mSDtfsCounter, 239 mSDsluCounter, 9975 mSDsCounter, 0 mSdLazyCounter, 1256 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 241 SdHoareTripleChecker+Valid, 13281 SdHoareTripleChecker+Invalid, 1275 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 1256 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-12-02 14:27:01,644 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [241 Valid, 13281 Invalid, 1275 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 1256 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-12-02 14:27:01,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72660 states. [2023-12-02 14:27:05,950 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72660 to 71039. [2023-12-02 14:27:05,978 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71039 states, 60262 states have (on average 1.1784208954233182) internal successors, (71014), 60399 states have internal predecessors, (71014), 5802 states have call successors, (5802), 4805 states have call predecessors, (5802), 4973 states have return successors, (7742), 5835 states have call predecessors, (7742), 5802 states have call successors, (7742) [2023-12-02 14:27:06,090 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71039 states to 71039 states and 84558 transitions. [2023-12-02 14:27:06,091 INFO L78 Accepts]: Start accepts. Automaton has 71039 states and 84558 transitions. Word has length 144 [2023-12-02 14:27:06,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:27:06,092 INFO L495 AbstractCegarLoop]: Abstraction has 71039 states and 84558 transitions. [2023-12-02 14:27:06,092 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 10.666666666666666) internal successors, (96), 9 states have internal predecessors, (96), 3 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) [2023-12-02 14:27:06,092 INFO L276 IsEmpty]: Start isEmpty. Operand 71039 states and 84558 transitions. [2023-12-02 14:27:06,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2023-12-02 14:27:06,116 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:27:06,116 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 14:27:06,121 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Ended with exit code 0 [2023-12-02 14:27:06,316 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:27:06,316 INFO L420 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:27:06,317 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:27:06,317 INFO L85 PathProgramCache]: Analyzing trace with hash 393178138, now seen corresponding path program 1 times [2023-12-02 14:27:06,317 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:27:06,317 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [43670191] [2023-12-02 14:27:06,317 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:27:06,317 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:27:06,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:27:06,833 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 24 proven. 37 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2023-12-02 14:27:06,833 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:27:06,833 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [43670191] [2023-12-02 14:27:06,833 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [43670191] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:27:06,833 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1383681052] [2023-12-02 14:27:06,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:27:06,834 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:27:06,834 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:27:06,834 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:27:06,835 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02ec86ab-3981-47a1-9f01-4fcd7d1b1288/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2023-12-02 14:27:06,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:27:06,973 INFO L262 TraceCheckSpWp]: Trace formula consists of 770 conjuncts, 32 conjunts are in the unsatisfiable core [2023-12-02 14:27:06,976 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:27:07,318 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 62 proven. 2 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2023-12-02 14:27:07,318 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:27:07,946 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 33 proven. 7 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2023-12-02 14:27:07,946 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1383681052] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:27:07,946 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1527287596] [2023-12-02 14:27:07,950 INFO L159 IcfgInterpreter]: Started Sifa with 90 locations of interest [2023-12-02 14:27:07,950 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:27:07,951 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:27:07,951 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:27:07,951 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:27:24,530 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events with input of size 1 for LOIs [2023-12-02 14:27:24,536 INFO L197 IcfgInterpreter]: Interpreting procedure fire_delta_events with input of size 151 for LOIs [2023-12-02 14:27:24,623 INFO L197 IcfgInterpreter]: Interpreting procedure update_channels with input of size 1 for LOIs [2023-12-02 14:27:24,624 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread with input of size 1 for LOIs [2023-12-02 14:27:24,636 INFO L197 IcfgInterpreter]: Interpreting procedure immediate_notify with input of size 94 for LOIs [2023-12-02 14:27:24,804 INFO L197 IcfgInterpreter]: Interpreting procedure activate_threads with input of size 1 for LOIs [2023-12-02 14:27:24,926 INFO L180 IcfgInterpreter]: Interpretation finished