./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/pc_sfifo_2.cil-1+token_ring.05.cil-2.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_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/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_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/pc_sfifo_2.cil-1+token_ring.05.cil-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/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_b0e79882-9f5e-4478-ab91-3f9fc9b13704/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 8b411c6ac71505d2c5059a06fd3211eebca89561d9ac8be37f9ecc9ff82a7a16 --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-12-02 16:51:18,754 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-12-02 16:51:18,822 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-12-02 16:51:18,827 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-12-02 16:51:18,827 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-12-02 16:51:18,851 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-12-02 16:51:18,852 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-12-02 16:51:18,853 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-12-02 16:51:18,853 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-12-02 16:51:18,854 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-12-02 16:51:18,854 INFO L153 SettingsManager]: * User list type=DISABLED [2023-12-02 16:51:18,855 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-12-02 16:51:18,855 INFO L153 SettingsManager]: * Explicit value domain=true [2023-12-02 16:51:18,856 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-12-02 16:51:18,856 INFO L153 SettingsManager]: * Octagon Domain=false [2023-12-02 16:51:18,857 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-12-02 16:51:18,857 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-12-02 16:51:18,858 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-12-02 16:51:18,858 INFO L153 SettingsManager]: * Interval Domain=false [2023-12-02 16:51:18,859 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-12-02 16:51:18,859 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-12-02 16:51:18,860 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-12-02 16:51:18,860 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-12-02 16:51:18,861 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-12-02 16:51:18,861 INFO L153 SettingsManager]: * sizeof long=4 [2023-12-02 16:51:18,862 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-12-02 16:51:18,862 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-12-02 16:51:18,862 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-12-02 16:51:18,863 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-12-02 16:51:18,863 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-12-02 16:51:18,863 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-12-02 16:51:18,864 INFO L153 SettingsManager]: * sizeof long double=12 [2023-12-02 16:51:18,864 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-12-02 16:51:18,864 INFO L153 SettingsManager]: * Use constant arrays=true [2023-12-02 16:51:18,865 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-12-02 16:51:18,865 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-12-02 16:51:18,865 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-12-02 16:51:18,865 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 16:51:18,865 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-12-02 16:51:18,866 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-12-02 16:51:18,866 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-12-02 16:51:18,866 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-12-02 16:51:18,866 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-12-02 16:51:18,866 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-12-02 16:51:18,867 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-12-02 16:51:18,867 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-12-02 16:51:18,867 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-12-02 16:51:18,867 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_b0e79882-9f5e-4478-ab91-3f9fc9b13704/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 8b411c6ac71505d2c5059a06fd3211eebca89561d9ac8be37f9ecc9ff82a7a16 [2023-12-02 16:51:19,093 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-12-02 16:51:19,114 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-12-02 16:51:19,116 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-12-02 16:51:19,117 INFO L270 PluginConnector]: Initializing CDTParser... [2023-12-02 16:51:19,118 INFO L274 PluginConnector]: CDTParser initialized [2023-12-02 16:51:19,119 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/../../sv-benchmarks/c/combinations/pc_sfifo_2.cil-1+token_ring.05.cil-2.c [2023-12-02 16:51:21,920 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-12-02 16:51:22,137 INFO L384 CDTParser]: Found 1 translation units. [2023-12-02 16:51:22,138 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/sv-benchmarks/c/combinations/pc_sfifo_2.cil-1+token_ring.05.cil-2.c [2023-12-02 16:51:22,153 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/data/7a0d8140d/28a1deb56daa4148af6cecfd651d97fc/FLAGbe7eadfda [2023-12-02 16:51:22,164 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/data/7a0d8140d/28a1deb56daa4148af6cecfd651d97fc [2023-12-02 16:51:22,167 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-12-02 16:51:22,168 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-12-02 16:51:22,170 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-12-02 16:51:22,170 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-12-02 16:51:22,174 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-12-02 16:51:22,175 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 04:51:22" (1/1) ... [2023-12-02 16:51:22,176 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2d46cea9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:51:22, skipping insertion in model container [2023-12-02 16:51:22,176 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 04:51:22" (1/1) ... [2023-12-02 16:51:22,221 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-12-02 16:51:22,343 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_b0e79882-9f5e-4478-ab91-3f9fc9b13704/sv-benchmarks/c/combinations/pc_sfifo_2.cil-1+token_ring.05.cil-2.c[914,927] [2023-12-02 16:51:22,393 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_b0e79882-9f5e-4478-ab91-3f9fc9b13704/sv-benchmarks/c/combinations/pc_sfifo_2.cil-1+token_ring.05.cil-2.c[7115,7128] [2023-12-02 16:51:22,452 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 16:51:22,463 INFO L202 MainTranslator]: Completed pre-run [2023-12-02 16:51:22,472 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_b0e79882-9f5e-4478-ab91-3f9fc9b13704/sv-benchmarks/c/combinations/pc_sfifo_2.cil-1+token_ring.05.cil-2.c[914,927] [2023-12-02 16:51:22,490 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_b0e79882-9f5e-4478-ab91-3f9fc9b13704/sv-benchmarks/c/combinations/pc_sfifo_2.cil-1+token_ring.05.cil-2.c[7115,7128] [2023-12-02 16:51:22,522 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 16:51:22,540 INFO L206 MainTranslator]: Completed translation [2023-12-02 16:51:22,541 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:51:22 WrapperNode [2023-12-02 16:51:22,541 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-12-02 16:51:22,542 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-12-02 16:51:22,542 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-12-02 16:51:22,542 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-12-02 16:51:22,548 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:51:22" (1/1) ... [2023-12-02 16:51:22,560 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:51:22" (1/1) ... [2023-12-02 16:51:22,595 INFO L138 Inliner]: procedures = 63, calls = 73, calls flagged for inlining = 31, calls inlined = 31, statements flattened = 656 [2023-12-02 16:51:22,595 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-12-02 16:51:22,596 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-12-02 16:51:22,596 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-12-02 16:51:22,597 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-12-02 16:51:22,607 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:51:22" (1/1) ... [2023-12-02 16:51:22,607 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:51:22" (1/1) ... [2023-12-02 16:51:22,612 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:51:22" (1/1) ... [2023-12-02 16:51:22,613 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:51:22" (1/1) ... [2023-12-02 16:51:22,626 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:51:22" (1/1) ... [2023-12-02 16:51:22,638 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:51:22" (1/1) ... [2023-12-02 16:51:22,641 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:51:22" (1/1) ... [2023-12-02 16:51:22,645 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:51:22" (1/1) ... [2023-12-02 16:51:22,650 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-12-02 16:51:22,652 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-12-02 16:51:22,652 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-12-02 16:51:22,652 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-12-02 16:51:22,653 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:51:22" (1/1) ... [2023-12-02 16:51:22,659 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 16:51:22,672 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:51:22,686 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-12-02 16:51:22,697 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-12-02 16:51:22,725 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-12-02 16:51:22,725 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2023-12-02 16:51:22,725 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2023-12-02 16:51:22,726 INFO L130 BoogieDeclarations]: Found specification of procedure is_do_write_p_triggered [2023-12-02 16:51:22,726 INFO L138 BoogieDeclarations]: Found implementation of procedure is_do_write_p_triggered [2023-12-02 16:51:22,726 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread1 [2023-12-02 16:51:22,726 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread1 [2023-12-02 16:51:22,726 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread2 [2023-12-02 16:51:22,726 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread2 [2023-12-02 16:51:22,726 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events1 [2023-12-02 16:51:22,727 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events1 [2023-12-02 16:51:22,727 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events2 [2023-12-02 16:51:22,727 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events2 [2023-12-02 16:51:22,727 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads2 [2023-12-02 16:51:22,727 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads2 [2023-12-02 16:51:22,727 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads1 [2023-12-02 16:51:22,728 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads1 [2023-12-02 16:51:22,728 INFO L130 BoogieDeclarations]: Found specification of procedure is_do_read_c_triggered [2023-12-02 16:51:22,728 INFO L138 BoogieDeclarations]: Found implementation of procedure is_do_read_c_triggered [2023-12-02 16:51:22,728 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels1 [2023-12-02 16:51:22,728 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels1 [2023-12-02 16:51:22,728 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels2 [2023-12-02 16:51:22,729 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels2 [2023-12-02 16:51:22,729 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-12-02 16:51:22,729 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events2 [2023-12-02 16:51:22,729 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events2 [2023-12-02 16:51:22,729 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events1 [2023-12-02 16:51:22,729 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events1 [2023-12-02 16:51:22,729 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-12-02 16:51:22,729 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-12-02 16:51:22,730 INFO L130 BoogieDeclarations]: Found specification of procedure error1 [2023-12-02 16:51:22,730 INFO L138 BoogieDeclarations]: Found implementation of procedure error1 [2023-12-02 16:51:22,730 INFO L130 BoogieDeclarations]: Found specification of procedure error2 [2023-12-02 16:51:22,730 INFO L138 BoogieDeclarations]: Found implementation of procedure error2 [2023-12-02 16:51:22,824 INFO L241 CfgBuilder]: Building ICFG [2023-12-02 16:51:22,826 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-12-02 16:51:23,384 INFO L282 CfgBuilder]: Performing block encoding [2023-12-02 16:51:23,656 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-12-02 16:51:23,656 INFO L309 CfgBuilder]: Removed 12 assume(true) statements. [2023-12-02 16:51:23,658 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 04:51:23 BoogieIcfgContainer [2023-12-02 16:51:23,658 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-12-02 16:51:23,661 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-12-02 16:51:23,661 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-12-02 16:51:23,664 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-12-02 16:51:23,664 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.12 04:51:22" (1/3) ... [2023-12-02 16:51:23,665 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@bee6ba4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 04:51:23, skipping insertion in model container [2023-12-02 16:51:23,665 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:51:22" (2/3) ... [2023-12-02 16:51:23,665 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@bee6ba4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 04:51:23, skipping insertion in model container [2023-12-02 16:51:23,665 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 04:51:23" (3/3) ... [2023-12-02 16:51:23,667 INFO L112 eAbstractionObserver]: Analyzing ICFG pc_sfifo_2.cil-1+token_ring.05.cil-2.c [2023-12-02 16:51:23,685 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-12-02 16:51:23,685 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2023-12-02 16:51:23,739 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-12-02 16:51:23,746 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;@599da08f, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-12-02 16:51:23,746 INFO L358 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2023-12-02 16:51:23,751 INFO L276 IsEmpty]: Start isEmpty. Operand has 195 states, 142 states have (on average 1.5) internal successors, (213), 150 states have internal predecessors, (213), 35 states have call successors, (35), 15 states have call predecessors, (35), 15 states have return successors, (35), 33 states have call predecessors, (35), 35 states have call successors, (35) [2023-12-02 16:51:23,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2023-12-02 16:51:23,760 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:51:23,761 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:51:23,761 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:51:23,766 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:51:23,766 INFO L85 PathProgramCache]: Analyzing trace with hash 1718822381, now seen corresponding path program 1 times [2023-12-02 16:51:23,776 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:51:23,777 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1718136886] [2023-12-02 16:51:23,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:51:23,777 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:51:23,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:51:24,238 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 16:51:24,239 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:51:24,239 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1718136886] [2023-12-02 16:51:24,240 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1718136886] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:51:24,240 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 16:51:24,240 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2023-12-02 16:51:24,242 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1495761885] [2023-12-02 16:51:24,243 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:51:24,247 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-12-02 16:51:24,247 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:51:24,276 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-12-02 16:51:24,277 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2023-12-02 16:51:24,280 INFO L87 Difference]: Start difference. First operand has 195 states, 142 states have (on average 1.5) internal successors, (213), 150 states have internal predecessors, (213), 35 states have call successors, (35), 15 states have call predecessors, (35), 15 states have return successors, (35), 33 states have call predecessors, (35), 35 states have call successors, (35) Second operand has 8 states, 7 states have (on average 4.285714285714286) internal successors, (30), 7 states have internal predecessors, (30), 4 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 4 states have call predecessors, (7), 3 states have call successors, (7) [2023-12-02 16:51:25,250 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:51:25,250 INFO L93 Difference]: Finished difference Result 446 states and 634 transitions. [2023-12-02 16:51:25,252 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-12-02 16:51:25,253 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 4.285714285714286) internal successors, (30), 7 states have internal predecessors, (30), 4 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 4 states have call predecessors, (7), 3 states have call successors, (7) Word has length 45 [2023-12-02 16:51:25,254 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:51:25,266 INFO L225 Difference]: With dead ends: 446 [2023-12-02 16:51:25,266 INFO L226 Difference]: Without dead ends: 254 [2023-12-02 16:51:25,271 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=90, Invalid=216, Unknown=0, NotChecked=0, Total=306 [2023-12-02 16:51:25,275 INFO L413 NwaCegarLoop]: 160 mSDtfsCounter, 419 mSDsluCounter, 676 mSDsCounter, 0 mSdLazyCounter, 756 mSolverCounterSat, 105 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 443 SdHoareTripleChecker+Valid, 836 SdHoareTripleChecker+Invalid, 861 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 105 IncrementalHoareTripleChecker+Valid, 756 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-12-02 16:51:25,276 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [443 Valid, 836 Invalid, 861 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [105 Valid, 756 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-12-02 16:51:25,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 254 states. [2023-12-02 16:51:25,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 254 to 241. [2023-12-02 16:51:25,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 241 states, 176 states have (on average 1.4090909090909092) internal successors, (248), 181 states have internal predecessors, (248), 43 states have call successors, (43), 22 states have call predecessors, (43), 20 states have return successors, (39), 39 states have call predecessors, (39), 39 states have call successors, (39) [2023-12-02 16:51:25,349 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 241 states to 241 states and 330 transitions. [2023-12-02 16:51:25,351 INFO L78 Accepts]: Start accepts. Automaton has 241 states and 330 transitions. Word has length 45 [2023-12-02 16:51:25,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:51:25,351 INFO L495 AbstractCegarLoop]: Abstraction has 241 states and 330 transitions. [2023-12-02 16:51:25,352 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 4.285714285714286) internal successors, (30), 7 states have internal predecessors, (30), 4 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 4 states have call predecessors, (7), 3 states have call successors, (7) [2023-12-02 16:51:25,352 INFO L276 IsEmpty]: Start isEmpty. Operand 241 states and 330 transitions. [2023-12-02 16:51:25,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2023-12-02 16:51:25,355 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:51:25,356 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:51:25,356 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-12-02 16:51:25,356 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:51:25,357 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:51:25,357 INFO L85 PathProgramCache]: Analyzing trace with hash -1198480078, now seen corresponding path program 1 times [2023-12-02 16:51:25,357 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:51:25,358 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1047339135] [2023-12-02 16:51:25,358 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:51:25,358 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:51:25,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:51:25,422 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 16:51:25,423 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:51:25,423 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1047339135] [2023-12-02 16:51:25,423 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1047339135] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:51:25,423 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 16:51:25,423 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 16:51:25,424 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [506617786] [2023-12-02 16:51:25,424 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:51:25,425 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:51:25,426 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:51:25,426 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:51:25,427 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 16:51:25,427 INFO L87 Difference]: Start difference. First operand 241 states and 330 transitions. Second operand has 3 states, 3 states have (on average 10.333333333333334) internal successors, (31), 3 states have internal predecessors, (31), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-12-02 16:51:25,535 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:51:25,535 INFO L93 Difference]: Finished difference Result 466 states and 617 transitions. [2023-12-02 16:51:25,536 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:51:25,536 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 10.333333333333334) internal successors, (31), 3 states have internal predecessors, (31), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 46 [2023-12-02 16:51:25,536 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:51:25,540 INFO L225 Difference]: With dead ends: 466 [2023-12-02 16:51:25,540 INFO L226 Difference]: Without dead ends: 350 [2023-12-02 16:51:25,542 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 16:51:25,543 INFO L413 NwaCegarLoop]: 222 mSDtfsCounter, 241 mSDsluCounter, 63 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 241 SdHoareTripleChecker+Valid, 285 SdHoareTripleChecker+Invalid, 62 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:51:25,544 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [241 Valid, 285 Invalid, 62 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 59 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:51:25,545 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 350 states. [2023-12-02 16:51:25,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 350 to 336. [2023-12-02 16:51:25,582 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 336 states, 241 states have (on average 1.3609958506224067) internal successors, (328), 246 states have internal predecessors, (328), 59 states have call successors, (59), 36 states have call predecessors, (59), 34 states have return successors, (55), 55 states have call predecessors, (55), 55 states have call successors, (55) [2023-12-02 16:51:25,584 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 336 states to 336 states and 442 transitions. [2023-12-02 16:51:25,585 INFO L78 Accepts]: Start accepts. Automaton has 336 states and 442 transitions. Word has length 46 [2023-12-02 16:51:25,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:51:25,585 INFO L495 AbstractCegarLoop]: Abstraction has 336 states and 442 transitions. [2023-12-02 16:51:25,586 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 10.333333333333334) internal successors, (31), 3 states have internal predecessors, (31), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-12-02 16:51:25,586 INFO L276 IsEmpty]: Start isEmpty. Operand 336 states and 442 transitions. [2023-12-02 16:51:25,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2023-12-02 16:51:25,588 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:51:25,588 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:51:25,589 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-12-02 16:51:25,589 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:51:25,589 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:51:25,590 INFO L85 PathProgramCache]: Analyzing trace with hash -1704554619, now seen corresponding path program 1 times [2023-12-02 16:51:25,590 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:51:25,590 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [823631894] [2023-12-02 16:51:25,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:51:25,590 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:51:25,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:51:25,650 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 16:51:25,650 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:51:25,650 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [823631894] [2023-12-02 16:51:25,650 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [823631894] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:51:25,651 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 16:51:25,651 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 16:51:25,651 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1655551562] [2023-12-02 16:51:25,651 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:51:25,652 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:51:25,652 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:51:25,652 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:51:25,653 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 16:51:25,653 INFO L87 Difference]: Start difference. First operand 336 states and 442 transitions. Second operand has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-12-02 16:51:25,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:51:25,788 INFO L93 Difference]: Finished difference Result 700 states and 890 transitions. [2023-12-02 16:51:25,788 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:51:25,788 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 47 [2023-12-02 16:51:25,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:51:25,792 INFO L225 Difference]: With dead ends: 700 [2023-12-02 16:51:25,792 INFO L226 Difference]: Without dead ends: 490 [2023-12-02 16:51:25,794 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 16:51:25,796 INFO L413 NwaCegarLoop]: 224 mSDtfsCounter, 68 mSDsluCounter, 202 mSDsCounter, 0 mSdLazyCounter, 86 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 426 SdHoareTripleChecker+Invalid, 89 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 86 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:51:25,796 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [68 Valid, 426 Invalid, 89 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 86 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:51:25,798 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 490 states. [2023-12-02 16:51:25,836 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 490 to 486. [2023-12-02 16:51:25,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 486 states, 346 states have (on average 1.3381502890173411) internal successors, (463), 351 states have internal predecessors, (463), 83 states have call successors, (83), 57 states have call predecessors, (83), 55 states have return successors, (79), 79 states have call predecessors, (79), 79 states have call successors, (79) [2023-12-02 16:51:25,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 486 states to 486 states and 625 transitions. [2023-12-02 16:51:25,842 INFO L78 Accepts]: Start accepts. Automaton has 486 states and 625 transitions. Word has length 47 [2023-12-02 16:51:25,842 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:51:25,842 INFO L495 AbstractCegarLoop]: Abstraction has 486 states and 625 transitions. [2023-12-02 16:51:25,843 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-12-02 16:51:25,843 INFO L276 IsEmpty]: Start isEmpty. Operand 486 states and 625 transitions. [2023-12-02 16:51:25,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2023-12-02 16:51:25,845 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:51:25,845 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:51:25,845 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-12-02 16:51:25,846 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:51:25,846 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:51:25,846 INFO L85 PathProgramCache]: Analyzing trace with hash 236359772, now seen corresponding path program 1 times [2023-12-02 16:51:25,846 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:51:25,847 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [698235225] [2023-12-02 16:51:25,847 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:51:25,847 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:51:25,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:51:25,940 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 16:51:25,941 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:51:25,941 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [698235225] [2023-12-02 16:51:25,941 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [698235225] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:51:25,942 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 16:51:25,942 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-12-02 16:51:25,942 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [231281759] [2023-12-02 16:51:25,942 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:51:25,942 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 16:51:25,943 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:51:25,943 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 16:51:25,943 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-12-02 16:51:25,943 INFO L87 Difference]: Start difference. First operand 486 states and 625 transitions. Second operand has 5 states, 5 states have (on average 7.2) internal successors, (36), 5 states have internal predecessors, (36), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2023-12-02 16:51:26,599 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:51:26,600 INFO L93 Difference]: Finished difference Result 1019 states and 1451 transitions. [2023-12-02 16:51:26,600 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-12-02 16:51:26,600 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 7.2) internal successors, (36), 5 states have internal predecessors, (36), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 47 [2023-12-02 16:51:26,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:51:26,607 INFO L225 Difference]: With dead ends: 1019 [2023-12-02 16:51:26,607 INFO L226 Difference]: Without dead ends: 904 [2023-12-02 16:51:26,609 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2023-12-02 16:51:26,610 INFO L413 NwaCegarLoop]: 339 mSDtfsCounter, 835 mSDsluCounter, 496 mSDsCounter, 0 mSdLazyCounter, 392 mSolverCounterSat, 190 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 835 SdHoareTripleChecker+Valid, 835 SdHoareTripleChecker+Invalid, 582 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 190 IncrementalHoareTripleChecker+Valid, 392 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-12-02 16:51:26,611 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [835 Valid, 835 Invalid, 582 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [190 Valid, 392 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-12-02 16:51:26,613 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 904 states. [2023-12-02 16:51:26,679 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 904 to 891. [2023-12-02 16:51:26,681 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 891 states, 670 states have (on average 1.3835820895522388) internal successors, (927), 678 states have internal predecessors, (927), 140 states have call successors, (140), 81 states have call predecessors, (140), 79 states have return successors, (170), 133 states have call predecessors, (170), 136 states have call successors, (170) [2023-12-02 16:51:26,688 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 891 states to 891 states and 1237 transitions. [2023-12-02 16:51:26,688 INFO L78 Accepts]: Start accepts. Automaton has 891 states and 1237 transitions. Word has length 47 [2023-12-02 16:51:26,689 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:51:26,689 INFO L495 AbstractCegarLoop]: Abstraction has 891 states and 1237 transitions. [2023-12-02 16:51:26,689 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 7.2) internal successors, (36), 5 states have internal predecessors, (36), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2023-12-02 16:51:26,689 INFO L276 IsEmpty]: Start isEmpty. Operand 891 states and 1237 transitions. [2023-12-02 16:51:26,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2023-12-02 16:51:26,691 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:51:26,691 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:51:26,691 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-12-02 16:51:26,691 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:51:26,692 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:51:26,692 INFO L85 PathProgramCache]: Analyzing trace with hash 1897891108, now seen corresponding path program 1 times [2023-12-02 16:51:26,692 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:51:26,692 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [193335255] [2023-12-02 16:51:26,693 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:51:26,693 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:51:26,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:51:26,737 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 16:51:26,738 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:51:26,738 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [193335255] [2023-12-02 16:51:26,738 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [193335255] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:51:26,738 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 16:51:26,738 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 16:51:26,739 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [653022580] [2023-12-02 16:51:26,739 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:51:26,739 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:51:26,739 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:51:26,740 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:51:26,740 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 16:51:26,740 INFO L87 Difference]: Start difference. First operand 891 states and 1237 transitions. Second operand has 3 states, 3 states have (on average 12.666666666666666) internal successors, (38), 3 states have internal predecessors, (38), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-12-02 16:51:26,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:51:26,875 INFO L93 Difference]: Finished difference Result 1315 states and 1759 transitions. [2023-12-02 16:51:26,876 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:51:26,876 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 12.666666666666666) internal successors, (38), 3 states have internal predecessors, (38), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 53 [2023-12-02 16:51:26,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:51:26,883 INFO L225 Difference]: With dead ends: 1315 [2023-12-02 16:51:26,883 INFO L226 Difference]: Without dead ends: 954 [2023-12-02 16:51:26,884 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 16:51:26,885 INFO L413 NwaCegarLoop]: 230 mSDtfsCounter, 241 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 60 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 241 SdHoareTripleChecker+Valid, 292 SdHoareTripleChecker+Invalid, 63 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 60 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:51:26,886 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [241 Valid, 292 Invalid, 63 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 60 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:51:26,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 954 states. [2023-12-02 16:51:26,950 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 954 to 942. [2023-12-02 16:51:26,953 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 942 states, 706 states have (on average 1.3725212464589236) internal successors, (969), 714 states have internal predecessors, (969), 148 states have call successors, (148), 88 states have call predecessors, (148), 86 states have return successors, (178), 141 states have call predecessors, (178), 144 states have call successors, (178) [2023-12-02 16:51:26,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 942 states to 942 states and 1295 transitions. [2023-12-02 16:51:26,961 INFO L78 Accepts]: Start accepts. Automaton has 942 states and 1295 transitions. Word has length 53 [2023-12-02 16:51:26,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:51:26,961 INFO L495 AbstractCegarLoop]: Abstraction has 942 states and 1295 transitions. [2023-12-02 16:51:26,961 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 12.666666666666666) internal successors, (38), 3 states have internal predecessors, (38), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-12-02 16:51:26,962 INFO L276 IsEmpty]: Start isEmpty. Operand 942 states and 1295 transitions. [2023-12-02 16:51:26,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2023-12-02 16:51:26,963 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:51:26,963 INFO L195 NwaCegarLoop]: trace histogram [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] [2023-12-02 16:51:26,963 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-12-02 16:51:26,964 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:51:26,964 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:51:26,964 INFO L85 PathProgramCache]: Analyzing trace with hash -1811367480, now seen corresponding path program 1 times [2023-12-02 16:51:26,964 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:51:26,965 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1063799] [2023-12-02 16:51:26,965 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:51:26,965 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:51:26,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:51:27,067 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 16:51:27,067 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:51:27,068 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1063799] [2023-12-02 16:51:27,068 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1063799] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:51:27,068 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 16:51:27,068 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-12-02 16:51:27,068 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1868148164] [2023-12-02 16:51:27,069 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:51:27,069 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 16:51:27,069 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:51:27,070 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 16:51:27,070 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 16:51:27,070 INFO L87 Difference]: Start difference. First operand 942 states and 1295 transitions. Second operand has 4 states, 4 states have (on average 9.75) internal successors, (39), 4 states have internal predecessors, (39), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 1 states have call predecessors, (7), 1 states have call successors, (7) [2023-12-02 16:51:27,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:51:27,366 INFO L93 Difference]: Finished difference Result 1051 states and 1427 transitions. [2023-12-02 16:51:27,367 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 16:51:27,367 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 9.75) internal successors, (39), 4 states have internal predecessors, (39), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 1 states have call predecessors, (7), 1 states have call successors, (7) Word has length 54 [2023-12-02 16:51:27,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:51:27,374 INFO L225 Difference]: With dead ends: 1051 [2023-12-02 16:51:27,374 INFO L226 Difference]: Without dead ends: 1048 [2023-12-02 16:51:27,375 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-12-02 16:51:27,376 INFO L413 NwaCegarLoop]: 227 mSDtfsCounter, 436 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 132 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 436 SdHoareTripleChecker+Valid, 271 SdHoareTripleChecker+Invalid, 204 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 132 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 16:51:27,376 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [436 Valid, 271 Invalid, 204 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [132 Valid, 72 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 16:51:27,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1048 states. [2023-12-02 16:51:27,451 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1048 to 941. [2023-12-02 16:51:27,453 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 941 states, 706 states have (on average 1.368271954674221) internal successors, (966), 713 states have internal predecessors, (966), 147 states have call successors, (147), 88 states have call predecessors, (147), 86 states have return successors, (178), 141 states have call predecessors, (178), 144 states have call successors, (178) [2023-12-02 16:51:27,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 941 states to 941 states and 1291 transitions. [2023-12-02 16:51:27,461 INFO L78 Accepts]: Start accepts. Automaton has 941 states and 1291 transitions. Word has length 54 [2023-12-02 16:51:27,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:51:27,462 INFO L495 AbstractCegarLoop]: Abstraction has 941 states and 1291 transitions. [2023-12-02 16:51:27,462 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 9.75) internal successors, (39), 4 states have internal predecessors, (39), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 1 states have call predecessors, (7), 1 states have call successors, (7) [2023-12-02 16:51:27,462 INFO L276 IsEmpty]: Start isEmpty. Operand 941 states and 1291 transitions. [2023-12-02 16:51:27,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2023-12-02 16:51:27,464 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:51:27,464 INFO L195 NwaCegarLoop]: trace histogram [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] [2023-12-02 16:51:27,464 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-12-02 16:51:27,464 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:51:27,465 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:51:27,465 INFO L85 PathProgramCache]: Analyzing trace with hash -318770706, now seen corresponding path program 1 times [2023-12-02 16:51:27,465 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:51:27,465 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1177461133] [2023-12-02 16:51:27,465 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:51:27,465 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:51:27,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:51:27,590 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 16:51:27,591 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:51:27,591 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1177461133] [2023-12-02 16:51:27,591 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1177461133] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:51:27,591 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1623681355] [2023-12-02 16:51:27,592 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:51:27,592 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:51:27,592 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:51:27,596 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:51:27,612 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-12-02 16:51:27,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:51:27,728 INFO L262 TraceCheckSpWp]: Trace formula consists of 303 conjuncts, 9 conjunts are in the unsatisfiable core [2023-12-02 16:51:27,735 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:51:27,970 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 16:51:27,970 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:51:28,049 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 16:51:28,050 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1623681355] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:51:28,050 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1480671041] [2023-12-02 16:51:28,067 INFO L159 IcfgInterpreter]: Started Sifa with 54 locations of interest [2023-12-02 16:51:28,067 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:51:28,070 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:51:28,074 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:51:28,074 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:51:31,929 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events1 with input of size 141 for LOIs [2023-12-02 16:51:31,980 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread1 with input of size 137 for LOIs [2023-12-02 16:51:32,033 INFO L197 IcfgInterpreter]: Interpreting procedure activate_threads1 with input of size 145 for LOIs [2023-12-02 16:51:32,821 INFO L197 IcfgInterpreter]: Interpreting procedure is_do_write_p_triggered with input of size 141 for LOIs [2023-12-02 16:51:32,958 INFO L197 IcfgInterpreter]: Interpreting procedure is_do_read_c_triggered with input of size 141 for LOIs [2023-12-02 16:51:33,093 INFO L197 IcfgInterpreter]: Interpreting procedure fire_delta_events1 with input of size 141 for LOIs [2023-12-02 16:51:33,153 INFO L197 IcfgInterpreter]: Interpreting procedure update_channels1 with input of size 148 for LOIs [2023-12-02 16:51:33,203 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:51:45,691 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [1480671041] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:51:45,691 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:51:45,691 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [5, 5, 4] total 41 [2023-12-02 16:51:45,692 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1779940133] [2023-12-02 16:51:45,692 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:51:45,693 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2023-12-02 16:51:45,693 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:51:45,694 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2023-12-02 16:51:45,695 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=1447, Unknown=0, NotChecked=0, Total=1640 [2023-12-02 16:51:45,695 INFO L87 Difference]: Start difference. First operand 941 states and 1291 transitions. Second operand has 36 states, 26 states have (on average 1.5) internal successors, (39), 26 states have internal predecessors, (39), 8 states have call successors, (8), 7 states have call predecessors, (8), 7 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2023-12-02 16:52:04,443 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:52:04,443 INFO L93 Difference]: Finished difference Result 1400 states and 1838 transitions. [2023-12-02 16:52:04,444 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2023-12-02 16:52:04,444 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 26 states have (on average 1.5) internal successors, (39), 26 states have internal predecessors, (39), 8 states have call successors, (8), 7 states have call predecessors, (8), 7 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) Word has length 55 [2023-12-02 16:52:04,444 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:52:04,449 INFO L225 Difference]: With dead ends: 1400 [2023-12-02 16:52:04,449 INFO L226 Difference]: Without dead ends: 990 [2023-12-02 16:52:04,451 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 126 SyntacticMatches, 3 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1430 ImplicationChecksByTransitivity, 24.4s TimeCoverageRelationStatistics Valid=601, Invalid=4091, Unknown=0, NotChecked=0, Total=4692 [2023-12-02 16:52:04,452 INFO L413 NwaCegarLoop]: 197 mSDtfsCounter, 149 mSDsluCounter, 1970 mSDsCounter, 0 mSdLazyCounter, 4224 mSolverCounterSat, 123 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 151 SdHoareTripleChecker+Valid, 2167 SdHoareTripleChecker+Invalid, 4347 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 123 IncrementalHoareTripleChecker+Valid, 4224 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.6s IncrementalHoareTripleChecker+Time [2023-12-02 16:52:04,452 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [151 Valid, 2167 Invalid, 4347 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [123 Valid, 4224 Invalid, 0 Unknown, 0 Unchecked, 6.6s Time] [2023-12-02 16:52:04,454 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 990 states. [2023-12-02 16:52:04,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 990 to 975. [2023-12-02 16:52:04,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 975 states, 732 states have (on average 1.3579234972677596) internal successors, (994), 739 states have internal predecessors, (994), 149 states have call successors, (149), 94 states have call predecessors, (149), 92 states have return successors, (180), 143 states have call predecessors, (180), 146 states have call successors, (180) [2023-12-02 16:52:04,547 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 975 states to 975 states and 1323 transitions. [2023-12-02 16:52:04,548 INFO L78 Accepts]: Start accepts. Automaton has 975 states and 1323 transitions. Word has length 55 [2023-12-02 16:52:04,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:52:04,548 INFO L495 AbstractCegarLoop]: Abstraction has 975 states and 1323 transitions. [2023-12-02 16:52:04,548 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 26 states have (on average 1.5) internal successors, (39), 26 states have internal predecessors, (39), 8 states have call successors, (8), 7 states have call predecessors, (8), 7 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2023-12-02 16:52:04,548 INFO L276 IsEmpty]: Start isEmpty. Operand 975 states and 1323 transitions. [2023-12-02 16:52:04,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2023-12-02 16:52:04,549 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:52:04,550 INFO L195 NwaCegarLoop]: trace histogram [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] [2023-12-02 16:52:04,555 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-12-02 16:52:04,750 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-12-02 16:52:04,751 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:52:04,751 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:52:04,751 INFO L85 PathProgramCache]: Analyzing trace with hash 867341833, now seen corresponding path program 1 times [2023-12-02 16:52:04,752 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:52:04,752 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1817574381] [2023-12-02 16:52:04,752 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:52:04,752 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:52:04,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:52:04,798 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-12-02 16:52:04,798 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:52:04,798 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1817574381] [2023-12-02 16:52:04,799 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1817574381] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:52:04,799 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 16:52:04,799 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 16:52:04,799 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [682453201] [2023-12-02 16:52:04,799 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:52:04,800 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:52:04,800 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:52:04,800 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:52:04,800 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 16:52:04,801 INFO L87 Difference]: Start difference. First operand 975 states and 1323 transitions. Second operand has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2023-12-02 16:52:04,973 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:52:04,973 INFO L93 Difference]: Finished difference Result 1426 states and 1879 transitions. [2023-12-02 16:52:04,974 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:52:04,974 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 61 [2023-12-02 16:52:04,974 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:52:04,981 INFO L225 Difference]: With dead ends: 1426 [2023-12-02 16:52:04,981 INFO L226 Difference]: Without dead ends: 1158 [2023-12-02 16:52:04,982 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 16:52:04,983 INFO L413 NwaCegarLoop]: 263 mSDtfsCounter, 44 mSDsluCounter, 218 mSDsCounter, 0 mSdLazyCounter, 94 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 481 SdHoareTripleChecker+Invalid, 94 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 94 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:52:04,983 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [44 Valid, 481 Invalid, 94 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 94 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:52:04,985 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1158 states. [2023-12-02 16:52:05,062 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1158 to 1029. [2023-12-02 16:52:05,064 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1029 states, 776 states have (on average 1.356958762886598) internal successors, (1053), 783 states have internal predecessors, (1053), 154 states have call successors, (154), 99 states have call predecessors, (154), 97 states have return successors, (185), 148 states have call predecessors, (185), 151 states have call successors, (185) [2023-12-02 16:52:05,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1029 states to 1029 states and 1392 transitions. [2023-12-02 16:52:05,068 INFO L78 Accepts]: Start accepts. Automaton has 1029 states and 1392 transitions. Word has length 61 [2023-12-02 16:52:05,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:52:05,069 INFO L495 AbstractCegarLoop]: Abstraction has 1029 states and 1392 transitions. [2023-12-02 16:52:05,069 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2023-12-02 16:52:05,069 INFO L276 IsEmpty]: Start isEmpty. Operand 1029 states and 1392 transitions. [2023-12-02 16:52:05,070 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2023-12-02 16:52:05,070 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:52:05,070 INFO L195 NwaCegarLoop]: trace histogram [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 16:52:05,070 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2023-12-02 16:52:05,070 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:52:05,071 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:52:05,071 INFO L85 PathProgramCache]: Analyzing trace with hash 1039107657, now seen corresponding path program 1 times [2023-12-02 16:52:05,071 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:52:05,071 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [681473951] [2023-12-02 16:52:05,071 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:52:05,071 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:52:05,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:52:05,193 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-12-02 16:52:05,193 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:52:05,193 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [681473951] [2023-12-02 16:52:05,193 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [681473951] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:52:05,193 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 16:52:05,193 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2023-12-02 16:52:05,193 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [638063474] [2023-12-02 16:52:05,194 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:52:05,194 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-12-02 16:52:05,194 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:52:05,195 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-12-02 16:52:05,195 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2023-12-02 16:52:05,195 INFO L87 Difference]: Start difference. First operand 1029 states and 1392 transitions. Second operand has 8 states, 7 states have (on average 6.285714285714286) internal successors, (44), 7 states have internal predecessors, (44), 4 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 5 states have call predecessors, (8), 4 states have call successors, (8) [2023-12-02 16:52:05,805 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:52:05,805 INFO L93 Difference]: Finished difference Result 1709 states and 2209 transitions. [2023-12-02 16:52:05,805 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-12-02 16:52:05,805 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 6.285714285714286) internal successors, (44), 7 states have internal predecessors, (44), 4 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 5 states have call predecessors, (8), 4 states have call successors, (8) Word has length 63 [2023-12-02 16:52:05,806 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:52:05,814 INFO L225 Difference]: With dead ends: 1709 [2023-12-02 16:52:05,814 INFO L226 Difference]: Without dead ends: 1292 [2023-12-02 16:52:05,816 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=90, Invalid=216, Unknown=0, NotChecked=0, Total=306 [2023-12-02 16:52:05,816 INFO L413 NwaCegarLoop]: 144 mSDtfsCounter, 381 mSDsluCounter, 631 mSDsCounter, 0 mSdLazyCounter, 719 mSolverCounterSat, 98 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 405 SdHoareTripleChecker+Valid, 775 SdHoareTripleChecker+Invalid, 817 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 98 IncrementalHoareTripleChecker+Valid, 719 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 16:52:05,817 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [405 Valid, 775 Invalid, 817 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [98 Valid, 719 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 16:52:05,819 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1292 states. [2023-12-02 16:52:05,966 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1292 to 1257. [2023-12-02 16:52:05,968 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1257 states, 929 states have (on average 1.3304628632938644) internal successors, (1236), 936 states have internal predecessors, (1236), 194 states have call successors, (194), 134 states have call predecessors, (194), 132 states have return successors, (225), 188 states have call predecessors, (225), 191 states have call successors, (225) [2023-12-02 16:52:05,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1257 states to 1257 states and 1655 transitions. [2023-12-02 16:52:05,975 INFO L78 Accepts]: Start accepts. Automaton has 1257 states and 1655 transitions. Word has length 63 [2023-12-02 16:52:05,975 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:52:05,976 INFO L495 AbstractCegarLoop]: Abstraction has 1257 states and 1655 transitions. [2023-12-02 16:52:05,976 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 6.285714285714286) internal successors, (44), 7 states have internal predecessors, (44), 4 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 5 states have call predecessors, (8), 4 states have call successors, (8) [2023-12-02 16:52:05,976 INFO L276 IsEmpty]: Start isEmpty. Operand 1257 states and 1655 transitions. [2023-12-02 16:52:05,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2023-12-02 16:52:05,978 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:52:05,978 INFO L195 NwaCegarLoop]: trace histogram [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] [2023-12-02 16:52:05,978 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-12-02 16:52:05,978 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:52:05,978 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:52:05,979 INFO L85 PathProgramCache]: Analyzing trace with hash -1570285973, now seen corresponding path program 1 times [2023-12-02 16:52:05,979 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:52:05,979 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1164665854] [2023-12-02 16:52:05,979 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:52:05,979 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:52:05,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:52:06,092 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-12-02 16:52:06,092 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:52:06,092 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1164665854] [2023-12-02 16:52:06,092 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1164665854] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:52:06,092 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [682621435] [2023-12-02 16:52:06,093 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:52:06,093 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:52:06,093 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:52:06,095 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:52:06,097 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-12-02 16:52:06,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:52:06,197 INFO L262 TraceCheckSpWp]: Trace formula consists of 324 conjuncts, 9 conjunts are in the unsatisfiable core [2023-12-02 16:52:06,201 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:52:06,378 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-12-02 16:52:06,378 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:52:06,439 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-12-02 16:52:06,439 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [682621435] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:52:06,440 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1110812406] [2023-12-02 16:52:06,443 INFO L159 IcfgInterpreter]: Started Sifa with 54 locations of interest [2023-12-02 16:52:06,443 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:52:06,443 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:52:06,444 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:52:06,444 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:52:11,305 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events1 with input of size 141 for LOIs [2023-12-02 16:52:11,354 INFO L197 IcfgInterpreter]: Interpreting procedure error1 with input of size 59 for LOIs [2023-12-02 16:52:11,367 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread1 with input of size 7 for LOIs [2023-12-02 16:52:11,370 INFO L197 IcfgInterpreter]: Interpreting procedure activate_threads1 with input of size 145 for LOIs [2023-12-02 16:52:12,023 INFO L197 IcfgInterpreter]: Interpreting procedure is_do_write_p_triggered with input of size 141 for LOIs [2023-12-02 16:52:12,155 INFO L197 IcfgInterpreter]: Interpreting procedure is_do_read_c_triggered with input of size 141 for LOIs [2023-12-02 16:52:12,298 INFO L197 IcfgInterpreter]: Interpreting procedure fire_delta_events1 with input of size 141 for LOIs [2023-12-02 16:52:12,347 INFO L197 IcfgInterpreter]: Interpreting procedure update_channels1 with input of size 148 for LOIs [2023-12-02 16:52:12,398 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:52:20,785 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '23060#(and (= ~q_req_up~0 1) (= ~q_free~0 1) (exists ((v_~q_free~0_44 Int) (|v_ULTIMATE.start_eval1_~tmp___1~0#1_BEFORE_CALL_1| Int)) (and (<= v_~q_free~0_44 1) (not (= ~p_dw_st~0 0)) (<= 0 ~p_dw_pc~0) (= |v_ULTIMATE.start_eval1_~tmp___1~0#1_BEFORE_CALL_1| 1) (not (= v_~q_free~0_44 1)))) (not (= ~c_num_read~0 ~p_num_write~0)) (exists ((|v_ULTIMATE.start_eval1_~tmp___0~2#1_BEFORE_CALL_3| Int)) (and (<= |v_ULTIMATE.start_eval1_~tmp___0~2#1_BEFORE_CALL_3| 2147483647) (<= 0 (+ |v_ULTIMATE.start_eval1_~tmp___0~2#1_BEFORE_CALL_3| 2147483648)) (not (= |v_ULTIMATE.start_eval1_~tmp___0~2#1_BEFORE_CALL_3| 0)))) (= ~c_last_read~0 ~q_buf_0~0) (= ~c_dr_pc~0 0) (= ~c_last_read~0 ~p_last_write~0) (= ~c_dr_st~0 1))' at error location [2023-12-02 16:52:20,786 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:52:20,786 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:52:20,786 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 4] total 7 [2023-12-02 16:52:20,786 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1226357827] [2023-12-02 16:52:20,786 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:52:20,787 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-12-02 16:52:20,787 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:52:20,788 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-12-02 16:52:20,789 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=260, Invalid=1902, Unknown=0, NotChecked=0, Total=2162 [2023-12-02 16:52:20,789 INFO L87 Difference]: Start difference. First operand 1257 states and 1655 transitions. Second operand has 7 states, 7 states have (on average 12.857142857142858) internal successors, (90), 7 states have internal predecessors, (90), 6 states have call successors, (23), 4 states have call predecessors, (23), 3 states have return successors, (22), 5 states have call predecessors, (22), 5 states have call successors, (22) [2023-12-02 16:52:21,344 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:52:21,344 INFO L93 Difference]: Finished difference Result 2802 states and 3522 transitions. [2023-12-02 16:52:21,344 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-12-02 16:52:21,344 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 12.857142857142858) internal successors, (90), 7 states have internal predecessors, (90), 6 states have call successors, (23), 4 states have call predecessors, (23), 3 states have return successors, (22), 5 states have call predecessors, (22), 5 states have call successors, (22) Word has length 64 [2023-12-02 16:52:21,345 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:52:21,360 INFO L225 Difference]: With dead ends: 2802 [2023-12-02 16:52:21,360 INFO L226 Difference]: Without dead ends: 2799 [2023-12-02 16:52:21,363 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 150 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 835 ImplicationChecksByTransitivity, 8.4s TimeCoverageRelationStatistics Valid=260, Invalid=1902, Unknown=0, NotChecked=0, Total=2162 [2023-12-02 16:52:21,363 INFO L413 NwaCegarLoop]: 326 mSDtfsCounter, 529 mSDsluCounter, 523 mSDsCounter, 0 mSdLazyCounter, 440 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 529 SdHoareTripleChecker+Valid, 849 SdHoareTripleChecker+Invalid, 471 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 440 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 16:52:21,364 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [529 Valid, 849 Invalid, 471 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 440 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 16:52:21,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2799 states. [2023-12-02 16:52:21,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2799 to 1997. [2023-12-02 16:52:21,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1997 states, 1447 states have (on average 1.308914996544575) internal successors, (1894), 1454 states have internal predecessors, (1894), 312 states have call successors, (312), 238 states have call predecessors, (312), 236 states have return successors, (343), 306 states have call predecessors, (343), 309 states have call successors, (343) [2023-12-02 16:52:21,571 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1997 states to 1997 states and 2549 transitions. [2023-12-02 16:52:21,572 INFO L78 Accepts]: Start accepts. Automaton has 1997 states and 2549 transitions. Word has length 64 [2023-12-02 16:52:21,572 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:52:21,572 INFO L495 AbstractCegarLoop]: Abstraction has 1997 states and 2549 transitions. [2023-12-02 16:52:21,572 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 12.857142857142858) internal successors, (90), 7 states have internal predecessors, (90), 6 states have call successors, (23), 4 states have call predecessors, (23), 3 states have return successors, (22), 5 states have call predecessors, (22), 5 states have call successors, (22) [2023-12-02 16:52:21,573 INFO L276 IsEmpty]: Start isEmpty. Operand 1997 states and 2549 transitions. [2023-12-02 16:52:21,574 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2023-12-02 16:52:21,574 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:52:21,575 INFO L195 NwaCegarLoop]: trace histogram [3, 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] [2023-12-02 16:52:21,580 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-12-02 16:52:21,780 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-12-02 16:52:21,780 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:52:21,781 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:52:21,781 INFO L85 PathProgramCache]: Analyzing trace with hash 572600273, now seen corresponding path program 2 times [2023-12-02 16:52:21,781 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:52:21,781 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1466543498] [2023-12-02 16:52:21,781 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:52:21,781 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:52:21,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:52:21,814 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-12-02 16:52:21,814 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:52:21,814 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1466543498] [2023-12-02 16:52:21,814 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1466543498] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:52:21,814 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 16:52:21,814 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 16:52:21,815 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [292418813] [2023-12-02 16:52:21,815 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:52:21,815 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:52:21,815 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:52:21,816 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:52:21,816 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 16:52:21,816 INFO L87 Difference]: Start difference. First operand 1997 states and 2549 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, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2023-12-02 16:52:22,070 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:52:22,070 INFO L93 Difference]: Finished difference Result 2765 states and 3481 transitions. [2023-12-02 16:52:22,071 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:52:22,071 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, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 67 [2023-12-02 16:52:22,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:52:22,080 INFO L225 Difference]: With dead ends: 2765 [2023-12-02 16:52:22,081 INFO L226 Difference]: Without dead ends: 1575 [2023-12-02 16:52:22,083 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 16:52:22,084 INFO L413 NwaCegarLoop]: 268 mSDtfsCounter, 241 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 70 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 241 SdHoareTripleChecker+Valid, 336 SdHoareTripleChecker+Invalid, 72 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 70 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:52:22,084 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [241 Valid, 336 Invalid, 72 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 70 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:52:22,087 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1575 states. [2023-12-02 16:52:22,290 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1575 to 1565. [2023-12-02 16:52:22,293 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1565 states, 1143 states have (on average 1.3088363954505686) internal successors, (1496), 1150 states have internal predecessors, (1496), 244 states have call successors, (244), 178 states have call predecessors, (244), 176 states have return successors, (275), 238 states have call predecessors, (275), 241 states have call successors, (275) [2023-12-02 16:52:22,301 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1565 states to 1565 states and 2015 transitions. [2023-12-02 16:52:22,301 INFO L78 Accepts]: Start accepts. Automaton has 1565 states and 2015 transitions. Word has length 67 [2023-12-02 16:52:22,301 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:52:22,301 INFO L495 AbstractCegarLoop]: Abstraction has 1565 states and 2015 transitions. [2023-12-02 16:52:22,302 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, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2023-12-02 16:52:22,302 INFO L276 IsEmpty]: Start isEmpty. Operand 1565 states and 2015 transitions. [2023-12-02 16:52:22,303 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2023-12-02 16:52:22,304 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:52:22,304 INFO L195 NwaCegarLoop]: trace histogram [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] [2023-12-02 16:52:22,304 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2023-12-02 16:52:22,304 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:52:22,304 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:52:22,304 INFO L85 PathProgramCache]: Analyzing trace with hash 1596173459, now seen corresponding path program 1 times [2023-12-02 16:52:22,305 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:52:22,305 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1812196037] [2023-12-02 16:52:22,305 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:52:22,305 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:52:22,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:52:22,361 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 15 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-12-02 16:52:22,361 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:52:22,361 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1812196037] [2023-12-02 16:52:22,362 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1812196037] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:52:22,362 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 16:52:22,362 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 16:52:22,362 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [668416991] [2023-12-02 16:52:22,362 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:52:22,362 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:52:22,362 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:52:22,363 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:52:22,363 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 16:52:22,363 INFO L87 Difference]: Start difference. First operand 1565 states and 2015 transitions. Second operand has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2023-12-02 16:52:22,637 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:52:22,637 INFO L93 Difference]: Finished difference Result 2596 states and 3248 transitions. [2023-12-02 16:52:22,638 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:52:22,638 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 71 [2023-12-02 16:52:22,638 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:52:22,648 INFO L225 Difference]: With dead ends: 2596 [2023-12-02 16:52:22,648 INFO L226 Difference]: Without dead ends: 1739 [2023-12-02 16:52:22,650 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 16:52:22,651 INFO L413 NwaCegarLoop]: 254 mSDtfsCounter, 39 mSDsluCounter, 218 mSDsCounter, 0 mSdLazyCounter, 93 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 472 SdHoareTripleChecker+Invalid, 93 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 93 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:52:22,651 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [39 Valid, 472 Invalid, 93 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 93 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:52:22,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1739 states. [2023-12-02 16:52:22,853 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1739 to 1610. [2023-12-02 16:52:22,857 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1610 states, 1180 states have (on average 1.305084745762712) internal successors, (1540), 1187 states have internal predecessors, (1540), 248 states have call successors, (248), 182 states have call predecessors, (248), 180 states have return successors, (279), 242 states have call predecessors, (279), 245 states have call successors, (279) [2023-12-02 16:52:22,862 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1610 states to 1610 states and 2067 transitions. [2023-12-02 16:52:22,862 INFO L78 Accepts]: Start accepts. Automaton has 1610 states and 2067 transitions. Word has length 71 [2023-12-02 16:52:22,863 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:52:22,863 INFO L495 AbstractCegarLoop]: Abstraction has 1610 states and 2067 transitions. [2023-12-02 16:52:22,863 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2023-12-02 16:52:22,863 INFO L276 IsEmpty]: Start isEmpty. Operand 1610 states and 2067 transitions. [2023-12-02 16:52:22,866 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2023-12-02 16:52:22,866 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:52:22,866 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, 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 16:52:22,866 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2023-12-02 16:52:22,866 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:52:22,867 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:52:22,867 INFO L85 PathProgramCache]: Analyzing trace with hash 1053328773, now seen corresponding path program 1 times [2023-12-02 16:52:22,867 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:52:22,867 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [787350244] [2023-12-02 16:52:22,867 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:52:22,867 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:52:22,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:52:22,967 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-12-02 16:52:22,967 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:52:22,968 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [787350244] [2023-12-02 16:52:22,968 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [787350244] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:52:22,968 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [231812078] [2023-12-02 16:52:22,968 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:52:22,968 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:52:22,968 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:52:22,969 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:52:22,972 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-12-02 16:52:23,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:52:23,114 INFO L262 TraceCheckSpWp]: Trace formula consists of 562 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 16:52:23,118 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:52:23,142 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-12-02 16:52:23,142 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:52:23,142 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [231812078] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:52:23,142 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:52:23,142 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-12-02 16:52:23,142 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1899361432] [2023-12-02 16:52:23,142 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:52:23,143 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:52:23,143 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:52:23,143 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:52:23,143 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 16:52:23,143 INFO L87 Difference]: Start difference. First operand 1610 states and 2067 transitions. Second operand has 3 states, 3 states have (on average 19.333333333333332) internal successors, (58), 2 states have internal predecessors, (58), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-12-02 16:52:23,383 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:52:23,384 INFO L93 Difference]: Finished difference Result 2634 states and 3660 transitions. [2023-12-02 16:52:23,384 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:52:23,384 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 19.333333333333332) internal successors, (58), 2 states have internal predecessors, (58), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 89 [2023-12-02 16:52:23,384 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:52:23,392 INFO L225 Difference]: With dead ends: 2634 [2023-12-02 16:52:23,392 INFO L226 Difference]: Without dead ends: 2114 [2023-12-02 16:52:23,395 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 89 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 16:52:23,395 INFO L413 NwaCegarLoop]: 223 mSDtfsCounter, 235 mSDsluCounter, 134 mSDsCounter, 0 mSdLazyCounter, 74 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 235 SdHoareTripleChecker+Valid, 357 SdHoareTripleChecker+Invalid, 76 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 74 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:52:23,395 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [235 Valid, 357 Invalid, 76 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 74 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:52:23,398 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2114 states. [2023-12-02 16:52:23,557 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2114 to 2105. [2023-12-02 16:52:23,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2105 states, 1578 states have (on average 1.3339670468948035) internal successors, (2105), 1588 states have internal predecessors, (2105), 315 states have call successors, (315), 212 states have call predecessors, (315), 210 states have return successors, (376), 306 states have call predecessors, (376), 312 states have call successors, (376) [2023-12-02 16:52:23,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2105 states to 2105 states and 2796 transitions. [2023-12-02 16:52:23,565 INFO L78 Accepts]: Start accepts. Automaton has 2105 states and 2796 transitions. Word has length 89 [2023-12-02 16:52:23,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:52:23,566 INFO L495 AbstractCegarLoop]: Abstraction has 2105 states and 2796 transitions. [2023-12-02 16:52:23,566 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 19.333333333333332) internal successors, (58), 2 states have internal predecessors, (58), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-12-02 16:52:23,566 INFO L276 IsEmpty]: Start isEmpty. Operand 2105 states and 2796 transitions. [2023-12-02 16:52:23,568 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2023-12-02 16:52:23,568 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:52:23,568 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, 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 16:52:23,573 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-12-02 16:52:23,769 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2023-12-02 16:52:23,769 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:52:23,769 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:52:23,769 INFO L85 PathProgramCache]: Analyzing trace with hash 614399879, now seen corresponding path program 1 times [2023-12-02 16:52:23,770 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:52:23,770 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2098317844] [2023-12-02 16:52:23,770 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:52:23,770 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:52:23,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:52:23,843 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-12-02 16:52:23,843 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:52:23,843 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2098317844] [2023-12-02 16:52:23,843 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2098317844] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:52:23,843 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [568169064] [2023-12-02 16:52:23,843 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:52:23,843 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:52:23,844 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:52:23,844 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:52:23,846 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-12-02 16:52:23,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:52:23,985 INFO L262 TraceCheckSpWp]: Trace formula consists of 556 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 16:52:23,989 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:52:24,033 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-12-02 16:52:24,033 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:52:24,033 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [568169064] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:52:24,033 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:52:24,033 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-12-02 16:52:24,033 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1400582210] [2023-12-02 16:52:24,034 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:52:24,034 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:52:24,034 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:52:24,034 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:52:24,035 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 16:52:24,035 INFO L87 Difference]: Start difference. First operand 2105 states and 2796 transitions. Second operand has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 2 states have internal predecessors, (61), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-12-02 16:52:24,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:52:24,311 INFO L93 Difference]: Finished difference Result 4104 states and 5876 transitions. [2023-12-02 16:52:24,312 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:52:24,312 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 2 states have internal predecessors, (61), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 89 [2023-12-02 16:52:24,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:52:24,325 INFO L225 Difference]: With dead ends: 4104 [2023-12-02 16:52:24,325 INFO L226 Difference]: Without dead ends: 3089 [2023-12-02 16:52:24,330 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 89 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 16:52:24,331 INFO L413 NwaCegarLoop]: 218 mSDtfsCounter, 232 mSDsluCounter, 134 mSDsCounter, 0 mSdLazyCounter, 74 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 232 SdHoareTripleChecker+Valid, 352 SdHoareTripleChecker+Invalid, 76 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 74 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:52:24,331 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [232 Valid, 352 Invalid, 76 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 74 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:52:24,335 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3089 states. [2023-12-02 16:52:24,609 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3089 to 3075. [2023-12-02 16:52:24,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3075 states, 2359 states have (on average 1.3586265366680796) internal successors, (3205), 2375 states have internal predecessors, (3205), 444 states have call successors, (444), 272 states have call predecessors, (444), 270 states have return successors, (561), 429 states have call predecessors, (561), 441 states have call successors, (561) [2023-12-02 16:52:24,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3075 states to 3075 states and 4210 transitions. [2023-12-02 16:52:24,621 INFO L78 Accepts]: Start accepts. Automaton has 3075 states and 4210 transitions. Word has length 89 [2023-12-02 16:52:24,621 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:52:24,621 INFO L495 AbstractCegarLoop]: Abstraction has 3075 states and 4210 transitions. [2023-12-02 16:52:24,621 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 2 states have internal predecessors, (61), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-12-02 16:52:24,621 INFO L276 IsEmpty]: Start isEmpty. Operand 3075 states and 4210 transitions. [2023-12-02 16:52:24,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2023-12-02 16:52:24,624 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:52:24,625 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, 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 16:52:24,630 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-12-02 16:52:24,825 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2023-12-02 16:52:24,825 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:52:24,825 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:52:24,826 INFO L85 PathProgramCache]: Analyzing trace with hash -620718907, now seen corresponding path program 1 times [2023-12-02 16:52:24,826 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:52:24,826 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1647412184] [2023-12-02 16:52:24,826 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:52:24,826 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:52:24,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:52:24,883 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2023-12-02 16:52:24,884 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:52:24,884 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1647412184] [2023-12-02 16:52:24,884 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1647412184] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:52:24,884 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 16:52:24,884 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 16:52:24,884 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1001898086] [2023-12-02 16:52:24,884 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:52:24,885 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:52:24,885 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:52:24,885 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:52:24,885 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 16:52:24,886 INFO L87 Difference]: Start difference. First operand 3075 states and 4210 transitions. Second operand has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2023-12-02 16:52:25,213 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:52:25,213 INFO L93 Difference]: Finished difference Result 5143 states and 7373 transitions. [2023-12-02 16:52:25,213 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:52:25,213 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 89 [2023-12-02 16:52:25,214 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:52:25,229 INFO L225 Difference]: With dead ends: 5143 [2023-12-02 16:52:25,229 INFO L226 Difference]: Without dead ends: 3547 [2023-12-02 16:52:25,233 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 16:52:25,234 INFO L413 NwaCegarLoop]: 293 mSDtfsCounter, 70 mSDsluCounter, 224 mSDsCounter, 0 mSdLazyCounter, 100 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 517 SdHoareTripleChecker+Invalid, 100 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 100 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:52:25,234 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [70 Valid, 517 Invalid, 100 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 100 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:52:25,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3547 states. [2023-12-02 16:52:25,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3547 to 3367. [2023-12-02 16:52:25,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3367 states, 2635 states have (on average 1.3817836812144213) internal successors, (3641), 2651 states have internal predecessors, (3641), 452 states have call successors, (452), 280 states have call predecessors, (452), 278 states have return successors, (569), 437 states have call predecessors, (569), 449 states have call successors, (569) [2023-12-02 16:52:25,481 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3367 states to 3367 states and 4662 transitions. [2023-12-02 16:52:25,481 INFO L78 Accepts]: Start accepts. Automaton has 3367 states and 4662 transitions. Word has length 89 [2023-12-02 16:52:25,481 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:52:25,481 INFO L495 AbstractCegarLoop]: Abstraction has 3367 states and 4662 transitions. [2023-12-02 16:52:25,482 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2023-12-02 16:52:25,482 INFO L276 IsEmpty]: Start isEmpty. Operand 3367 states and 4662 transitions. [2023-12-02 16:52:25,486 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2023-12-02 16:52:25,486 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:52:25,486 INFO L195 NwaCegarLoop]: trace histogram [4, 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, 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] [2023-12-02 16:52:25,486 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2023-12-02 16:52:25,487 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:52:25,487 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:52:25,487 INFO L85 PathProgramCache]: Analyzing trace with hash -60587174, now seen corresponding path program 1 times [2023-12-02 16:52:25,487 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:52:25,488 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [167228313] [2023-12-02 16:52:25,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:52:25,488 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:52:25,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:52:25,757 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 15 proven. 13 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-12-02 16:52:25,757 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:52:25,757 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [167228313] [2023-12-02 16:52:25,758 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [167228313] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:52:25,769 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1430608367] [2023-12-02 16:52:25,769 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:52:25,769 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:52:25,769 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:52:25,770 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:52:25,773 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-12-02 16:52:25,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:52:25,892 INFO L262 TraceCheckSpWp]: Trace formula consists of 445 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 16:52:25,896 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:52:25,937 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 50 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-12-02 16:52:25,937 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:52:25,937 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1430608367] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:52:25,938 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:52:25,938 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [14] total 15 [2023-12-02 16:52:25,938 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [676267440] [2023-12-02 16:52:25,938 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:52:25,938 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:52:25,939 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:52:25,939 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:52:25,939 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=173, Unknown=0, NotChecked=0, Total=210 [2023-12-02 16:52:25,940 INFO L87 Difference]: Start difference. First operand 3367 states and 4662 transitions. Second operand has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 3 states have internal predecessors, (68), 3 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (16), 3 states have call predecessors, (16), 3 states have call successors, (16) [2023-12-02 16:52:26,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:52:26,241 INFO L93 Difference]: Finished difference Result 4196 states and 5680 transitions. [2023-12-02 16:52:26,241 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:52:26,241 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 3 states have internal predecessors, (68), 3 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (16), 3 states have call predecessors, (16), 3 states have call successors, (16) Word has length 102 [2023-12-02 16:52:26,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:52:26,259 INFO L225 Difference]: With dead ends: 4196 [2023-12-02 16:52:26,259 INFO L226 Difference]: Without dead ends: 3396 [2023-12-02 16:52:26,262 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 102 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=173, Unknown=0, NotChecked=0, Total=210 [2023-12-02 16:52:26,263 INFO L413 NwaCegarLoop]: 271 mSDtfsCounter, 47 mSDsluCounter, 212 mSDsCounter, 0 mSdLazyCounter, 94 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 483 SdHoareTripleChecker+Invalid, 96 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 94 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:52:26,264 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [47 Valid, 483 Invalid, 96 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 94 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:52:26,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3396 states. [2023-12-02 16:52:26,618 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3396 to 3363. [2023-12-02 16:52:26,623 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3363 states, 2631 states have (on average 1.37020144431775) internal successors, (3605), 2647 states have internal predecessors, (3605), 452 states have call successors, (452), 280 states have call predecessors, (452), 278 states have return successors, (569), 437 states have call predecessors, (569), 449 states have call successors, (569) [2023-12-02 16:52:26,633 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3363 states to 3363 states and 4626 transitions. [2023-12-02 16:52:26,633 INFO L78 Accepts]: Start accepts. Automaton has 3363 states and 4626 transitions. Word has length 102 [2023-12-02 16:52:26,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:52:26,633 INFO L495 AbstractCegarLoop]: Abstraction has 3363 states and 4626 transitions. [2023-12-02 16:52:26,634 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 3 states have internal predecessors, (68), 3 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (16), 3 states have call predecessors, (16), 3 states have call successors, (16) [2023-12-02 16:52:26,635 INFO L276 IsEmpty]: Start isEmpty. Operand 3363 states and 4626 transitions. [2023-12-02 16:52:26,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2023-12-02 16:52:26,640 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:52:26,641 INFO L195 NwaCegarLoop]: trace histogram [4, 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, 1, 1, 1, 1, 1] [2023-12-02 16:52:26,646 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-12-02 16:52:26,841 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2023-12-02 16:52:26,841 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:52:26,841 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:52:26,842 INFO L85 PathProgramCache]: Analyzing trace with hash 1515970585, now seen corresponding path program 1 times [2023-12-02 16:52:26,842 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:52:26,842 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1212357114] [2023-12-02 16:52:26,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:52:26,842 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:52:26,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:52:27,167 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 15 proven. 13 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2023-12-02 16:52:27,168 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:52:27,168 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1212357114] [2023-12-02 16:52:27,168 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1212357114] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:52:27,168 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [221111627] [2023-12-02 16:52:27,168 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:52:27,168 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:52:27,168 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:52:27,170 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:52:27,172 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-12-02 16:52:27,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:52:27,286 INFO L262 TraceCheckSpWp]: Trace formula consists of 448 conjuncts, 13 conjunts are in the unsatisfiable core [2023-12-02 16:52:27,289 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:52:27,328 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 49 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-12-02 16:52:27,328 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:52:27,328 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [221111627] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:52:27,328 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:52:27,328 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [14] total 17 [2023-12-02 16:52:27,328 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2121601093] [2023-12-02 16:52:27,329 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:52:27,329 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 16:52:27,329 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:52:27,329 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 16:52:27,329 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2023-12-02 16:52:27,330 INFO L87 Difference]: Start difference. First operand 3363 states and 4626 transitions. Second operand has 6 states, 5 states have (on average 13.6) internal successors, (68), 5 states have internal predecessors, (68), 3 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (16), 3 states have call predecessors, (16), 3 states have call successors, (16) [2023-12-02 16:52:27,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:52:27,738 INFO L93 Difference]: Finished difference Result 4247 states and 5696 transitions. [2023-12-02 16:52:27,738 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-12-02 16:52:27,738 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 13.6) internal successors, (68), 5 states have internal predecessors, (68), 3 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (16), 3 states have call predecessors, (16), 3 states have call successors, (16) Word has length 102 [2023-12-02 16:52:27,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:52:27,751 INFO L225 Difference]: With dead ends: 4247 [2023-12-02 16:52:27,751 INFO L226 Difference]: Without dead ends: 3194 [2023-12-02 16:52:27,754 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 101 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=64, Invalid=316, Unknown=0, NotChecked=0, Total=380 [2023-12-02 16:52:27,755 INFO L413 NwaCegarLoop]: 267 mSDtfsCounter, 232 mSDsluCounter, 802 mSDsCounter, 0 mSdLazyCounter, 267 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 234 SdHoareTripleChecker+Valid, 1069 SdHoareTripleChecker+Invalid, 268 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 267 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 16:52:27,755 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [234 Valid, 1069 Invalid, 268 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 267 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 16:52:27,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3194 states. [2023-12-02 16:52:27,947 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3194 to 2997. [2023-12-02 16:52:27,950 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2997 states, 2397 states have (on average 1.3892365456821025) internal successors, (3330), 2413 states have internal predecessors, (3330), 381 states have call successors, (381), 219 states have call predecessors, (381), 217 states have return successors, (498), 366 states have call predecessors, (498), 378 states have call successors, (498) [2023-12-02 16:52:27,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2997 states to 2997 states and 4209 transitions. [2023-12-02 16:52:27,956 INFO L78 Accepts]: Start accepts. Automaton has 2997 states and 4209 transitions. Word has length 102 [2023-12-02 16:52:27,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:52:27,957 INFO L495 AbstractCegarLoop]: Abstraction has 2997 states and 4209 transitions. [2023-12-02 16:52:27,957 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 13.6) internal successors, (68), 5 states have internal predecessors, (68), 3 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (16), 3 states have call predecessors, (16), 3 states have call successors, (16) [2023-12-02 16:52:27,957 INFO L276 IsEmpty]: Start isEmpty. Operand 2997 states and 4209 transitions. [2023-12-02 16:52:27,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2023-12-02 16:52:27,961 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:52:27,962 INFO L195 NwaCegarLoop]: trace histogram [4, 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, 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] [2023-12-02 16:52:27,966 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-12-02 16:52:28,162 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2023-12-02 16:52:28,162 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:52:28,163 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:52:28,163 INFO L85 PathProgramCache]: Analyzing trace with hash -620612586, now seen corresponding path program 1 times [2023-12-02 16:52:28,163 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:52:28,163 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1525092693] [2023-12-02 16:52:28,163 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:52:28,163 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:52:28,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:52:28,204 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 31 proven. 0 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2023-12-02 16:52:28,204 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:52:28,204 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1525092693] [2023-12-02 16:52:28,204 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1525092693] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:52:28,204 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 16:52:28,204 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-12-02 16:52:28,204 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1382749806] [2023-12-02 16:52:28,205 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:52:28,205 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 16:52:28,205 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:52:28,206 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 16:52:28,206 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 16:52:28,206 INFO L87 Difference]: Start difference. First operand 2997 states and 4209 transitions. Second operand has 4 states, 4 states have (on average 16.5) internal successors, (66), 4 states have internal predecessors, (66), 4 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) [2023-12-02 16:52:28,645 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:52:28,646 INFO L93 Difference]: Finished difference Result 3616 states and 4951 transitions. [2023-12-02 16:52:28,646 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 16:52:28,646 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 16.5) internal successors, (66), 4 states have internal predecessors, (66), 4 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) Word has length 112 [2023-12-02 16:52:28,646 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:52:28,658 INFO L225 Difference]: With dead ends: 3616 [2023-12-02 16:52:28,658 INFO L226 Difference]: Without dead ends: 2996 [2023-12-02 16:52:28,660 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 16:52:28,661 INFO L413 NwaCegarLoop]: 259 mSDtfsCounter, 293 mSDsluCounter, 176 mSDsCounter, 0 mSdLazyCounter, 195 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 293 SdHoareTripleChecker+Valid, 435 SdHoareTripleChecker+Invalid, 200 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 195 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 16:52:28,661 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [293 Valid, 435 Invalid, 200 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 195 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 16:52:28,665 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2996 states. [2023-12-02 16:52:28,997 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2996 to 2987. [2023-12-02 16:52:29,000 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2987 states, 2387 states have (on average 1.3799748638458316) internal successors, (3294), 2403 states have internal predecessors, (3294), 381 states have call successors, (381), 219 states have call predecessors, (381), 217 states have return successors, (498), 366 states have call predecessors, (498), 378 states have call successors, (498) [2023-12-02 16:52:29,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2987 states to 2987 states and 4173 transitions. [2023-12-02 16:52:29,009 INFO L78 Accepts]: Start accepts. Automaton has 2987 states and 4173 transitions. Word has length 112 [2023-12-02 16:52:29,009 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:52:29,010 INFO L495 AbstractCegarLoop]: Abstraction has 2987 states and 4173 transitions. [2023-12-02 16:52:29,010 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 16.5) internal successors, (66), 4 states have internal predecessors, (66), 4 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) [2023-12-02 16:52:29,010 INFO L276 IsEmpty]: Start isEmpty. Operand 2987 states and 4173 transitions. [2023-12-02 16:52:29,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2023-12-02 16:52:29,017 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:52:29,017 INFO L195 NwaCegarLoop]: trace histogram [4, 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, 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 16:52:29,017 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2023-12-02 16:52:29,017 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:52:29,018 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:52:29,018 INFO L85 PathProgramCache]: Analyzing trace with hash 1272829589, now seen corresponding path program 1 times [2023-12-02 16:52:29,018 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:52:29,018 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [891097175] [2023-12-02 16:52:29,018 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:52:29,018 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:52:29,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:52:29,189 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 25 proven. 8 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2023-12-02 16:52:29,189 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:52:29,189 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [891097175] [2023-12-02 16:52:29,190 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [891097175] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:52:29,190 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1514227215] [2023-12-02 16:52:29,190 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:52:29,190 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:52:29,190 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:52:29,191 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:52:29,193 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-12-02 16:52:29,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:52:29,323 INFO L262 TraceCheckSpWp]: Trace formula consists of 479 conjuncts, 14 conjunts are in the unsatisfiable core [2023-12-02 16:52:29,326 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:52:29,392 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 55 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-12-02 16:52:29,392 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:52:29,393 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1514227215] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:52:29,393 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:52:29,393 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [8] total 13 [2023-12-02 16:52:29,393 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [94938233] [2023-12-02 16:52:29,393 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:52:29,394 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-12-02 16:52:29,394 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:52:29,395 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-12-02 16:52:29,395 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2023-12-02 16:52:29,395 INFO L87 Difference]: Start difference. First operand 2987 states and 4173 transitions. Second operand has 7 states, 6 states have (on average 12.833333333333334) internal successors, (77), 6 states have internal predecessors, (77), 3 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (16), 3 states have call predecessors, (16), 3 states have call successors, (16) [2023-12-02 16:52:29,784 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:52:29,784 INFO L93 Difference]: Finished difference Result 3536 states and 4798 transitions. [2023-12-02 16:52:29,784 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-12-02 16:52:29,784 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 12.833333333333334) internal successors, (77), 6 states have internal predecessors, (77), 3 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (16), 3 states have call predecessors, (16), 3 states have call successors, (16) Word has length 112 [2023-12-02 16:52:29,784 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:52:29,793 INFO L225 Difference]: With dead ends: 3536 [2023-12-02 16:52:29,793 INFO L226 Difference]: Without dead ends: 2943 [2023-12-02 16:52:29,795 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 111 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=64, Invalid=208, Unknown=0, NotChecked=0, Total=272 [2023-12-02 16:52:29,796 INFO L413 NwaCegarLoop]: 263 mSDtfsCounter, 62 mSDsluCounter, 962 mSDsCounter, 0 mSdLazyCounter, 297 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 1225 SdHoareTripleChecker+Invalid, 299 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 297 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:52:29,796 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [63 Valid, 1225 Invalid, 299 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 297 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:52:29,799 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2943 states. [2023-12-02 16:52:30,011 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2943 to 2851. [2023-12-02 16:52:30,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2851 states, 2287 states have (on average 1.389156099693922) internal successors, (3177), 2303 states have internal predecessors, (3177), 362 states have call successors, (362), 202 states have call predecessors, (362), 200 states have return successors, (479), 347 states have call predecessors, (479), 359 states have call successors, (479) [2023-12-02 16:52:30,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2851 states to 2851 states and 4018 transitions. [2023-12-02 16:52:30,019 INFO L78 Accepts]: Start accepts. Automaton has 2851 states and 4018 transitions. Word has length 112 [2023-12-02 16:52:30,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:52:30,019 INFO L495 AbstractCegarLoop]: Abstraction has 2851 states and 4018 transitions. [2023-12-02 16:52:30,019 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 12.833333333333334) internal successors, (77), 6 states have internal predecessors, (77), 3 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (16), 3 states have call predecessors, (16), 3 states have call successors, (16) [2023-12-02 16:52:30,019 INFO L276 IsEmpty]: Start isEmpty. Operand 2851 states and 4018 transitions. [2023-12-02 16:52:30,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2023-12-02 16:52:30,024 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:52:30,024 INFO L195 NwaCegarLoop]: trace histogram [4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:52:30,029 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2023-12-02 16:52:30,224 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:52:30,225 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:52:30,225 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:52:30,225 INFO L85 PathProgramCache]: Analyzing trace with hash 554164972, now seen corresponding path program 1 times [2023-12-02 16:52:30,225 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:52:30,225 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1967555550] [2023-12-02 16:52:30,226 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:52:30,226 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:52:30,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:52:30,366 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 16 proven. 6 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2023-12-02 16:52:30,367 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:52:30,367 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1967555550] [2023-12-02 16:52:30,367 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1967555550] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:52:30,367 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1918221213] [2023-12-02 16:52:30,367 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:52:30,367 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:52:30,367 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:52:30,368 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:52:30,371 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-12-02 16:52:30,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:52:30,498 INFO L262 TraceCheckSpWp]: Trace formula consists of 485 conjuncts, 6 conjunts are in the unsatisfiable core [2023-12-02 16:52:30,501 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:52:30,557 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 36 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-12-02 16:52:30,557 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:52:30,557 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1918221213] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:52:30,557 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:52:30,558 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [8] total 11 [2023-12-02 16:52:30,558 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [840966006] [2023-12-02 16:52:30,558 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:52:30,558 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 16:52:30,558 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:52:30,559 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 16:52:30,559 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2023-12-02 16:52:30,559 INFO L87 Difference]: Start difference. First operand 2851 states and 4018 transitions. Second operand has 6 states, 5 states have (on average 14.0) internal successors, (70), 5 states have internal predecessors, (70), 3 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (15), 3 states have call predecessors, (15), 2 states have call successors, (15) [2023-12-02 16:52:31,001 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:52:31,001 INFO L93 Difference]: Finished difference Result 3600 states and 4863 transitions. [2023-12-02 16:52:31,004 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-12-02 16:52:31,005 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 14.0) internal successors, (70), 5 states have internal predecessors, (70), 3 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (15), 3 states have call predecessors, (15), 2 states have call successors, (15) Word has length 113 [2023-12-02 16:52:31,005 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:52:31,015 INFO L225 Difference]: With dead ends: 3600 [2023-12-02 16:52:31,015 INFO L226 Difference]: Without dead ends: 3143 [2023-12-02 16:52:31,017 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 113 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2023-12-02 16:52:31,018 INFO L413 NwaCegarLoop]: 255 mSDtfsCounter, 217 mSDsluCounter, 825 mSDsCounter, 0 mSdLazyCounter, 226 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 218 SdHoareTripleChecker+Valid, 1080 SdHoareTripleChecker+Invalid, 229 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 226 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:52:31,018 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [218 Valid, 1080 Invalid, 229 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 226 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:52:31,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3143 states. [2023-12-02 16:52:31,262 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3143 to 3109. [2023-12-02 16:52:31,265 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3109 states, 2449 states have (on average 1.370763576970192) internal successors, (3357), 2471 states have internal predecessors, (3357), 410 states have call successors, (410), 244 states have call predecessors, (410), 248 states have return successors, (539), 395 states have call predecessors, (539), 407 states have call successors, (539) [2023-12-02 16:52:31,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3109 states to 3109 states and 4306 transitions. [2023-12-02 16:52:31,271 INFO L78 Accepts]: Start accepts. Automaton has 3109 states and 4306 transitions. Word has length 113 [2023-12-02 16:52:31,272 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:52:31,272 INFO L495 AbstractCegarLoop]: Abstraction has 3109 states and 4306 transitions. [2023-12-02 16:52:31,272 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 14.0) internal successors, (70), 5 states have internal predecessors, (70), 3 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (15), 3 states have call predecessors, (15), 2 states have call successors, (15) [2023-12-02 16:52:31,272 INFO L276 IsEmpty]: Start isEmpty. Operand 3109 states and 4306 transitions. [2023-12-02 16:52:31,276 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2023-12-02 16:52:31,276 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:52:31,276 INFO L195 NwaCegarLoop]: trace histogram [4, 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, 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] [2023-12-02 16:52:31,282 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2023-12-02 16:52:31,476 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable19 [2023-12-02 16:52:31,477 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:52:31,477 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:52:31,477 INFO L85 PathProgramCache]: Analyzing trace with hash -991188063, now seen corresponding path program 1 times [2023-12-02 16:52:31,478 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:52:31,478 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [471217908] [2023-12-02 16:52:31,478 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:52:31,478 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:52:31,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:52:32,210 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 22 proven. 15 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-12-02 16:52:32,210 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:52:32,210 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [471217908] [2023-12-02 16:52:32,210 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [471217908] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:52:32,210 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1567062265] [2023-12-02 16:52:32,211 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:52:32,211 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:52:32,211 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:52:32,212 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:52:32,212 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-12-02 16:52:32,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:52:32,310 INFO L262 TraceCheckSpWp]: Trace formula consists of 490 conjuncts, 59 conjunts are in the unsatisfiable core [2023-12-02 16:52:32,314 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:52:33,082 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 31 proven. 24 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-12-02 16:52:33,083 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:52:34,536 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 22 proven. 13 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2023-12-02 16:52:34,536 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1567062265] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:52:34,536 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [252318424] [2023-12-02 16:52:34,539 INFO L159 IcfgInterpreter]: Started Sifa with 68 locations of interest [2023-12-02 16:52:34,539 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:52:34,539 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:52:34,539 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:52:34,540 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:52:59,157 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events1 with input of size 7 for LOIs [2023-12-02 16:52:59,159 INFO L197 IcfgInterpreter]: Interpreting procedure error1 with input of size 13 for LOIs [2023-12-02 16:52:59,160 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread1 with input of size 7 for LOIs [2023-12-02 16:52:59,164 INFO L197 IcfgInterpreter]: Interpreting procedure activate_threads1 with input of size 154 for LOIs [2023-12-02 16:52:59,981 INFO L197 IcfgInterpreter]: Interpreting procedure is_do_write_p_triggered with input of size 155 for LOIs [2023-12-02 16:53:00,774 INFO L197 IcfgInterpreter]: Interpreting procedure is_do_read_c_triggered with input of size 16 for LOIs [2023-12-02 16:53:00,793 INFO L197 IcfgInterpreter]: Interpreting procedure fire_delta_events1 with input of size 148 for LOIs [2023-12-02 16:53:00,930 INFO L197 IcfgInterpreter]: Interpreting procedure update_channels1 with input of size 159 for LOIs [2023-12-02 16:53:01,088 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:53:09,633 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '114101#(and (= ~q_req_up~0 1) (= ~q_free~0 1) (not (= ~c_num_read~0 ~p_num_write~0)) (= ~c_last_read~0 ~p_last_write~0))' at error location [2023-12-02 16:53:09,634 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:53:09,634 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:53:09,634 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 17, 16] total 51 [2023-12-02 16:53:09,634 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1939309460] [2023-12-02 16:53:09,634 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:53:09,635 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2023-12-02 16:53:09,635 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:53:09,636 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2023-12-02 16:53:09,639 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=829, Invalid=10091, Unknown=0, NotChecked=0, Total=10920 [2023-12-02 16:53:09,640 INFO L87 Difference]: Start difference. First operand 3109 states and 4306 transitions. Second operand has 51 states, 33 states have (on average 5.909090909090909) internal successors, (195), 38 states have internal predecessors, (195), 19 states have call successors, (44), 14 states have call predecessors, (44), 22 states have return successors, (46), 19 states have call predecessors, (46), 19 states have call successors, (46) [2023-12-02 16:53:24,754 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:53:24,754 INFO L93 Difference]: Finished difference Result 5978 states and 7795 transitions. [2023-12-02 16:53:24,754 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 255 states. [2023-12-02 16:53:24,754 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 33 states have (on average 5.909090909090909) internal successors, (195), 38 states have internal predecessors, (195), 19 states have call successors, (44), 14 states have call predecessors, (44), 22 states have return successors, (46), 19 states have call predecessors, (46), 19 states have call successors, (46) Word has length 114 [2023-12-02 16:53:24,755 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:53:24,764 INFO L225 Difference]: With dead ends: 5978 [2023-12-02 16:53:24,765 INFO L226 Difference]: Without dead ends: 5263 [2023-12-02 16:53:24,790 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 648 GetRequests, 292 SyntacticMatches, 3 SemanticMatches, 353 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 51514 ImplicationChecksByTransitivity, 19.6s TimeCoverageRelationStatistics Valid=11592, Invalid=114078, Unknown=0, NotChecked=0, Total=125670 [2023-12-02 16:53:24,791 INFO L413 NwaCegarLoop]: 232 mSDtfsCounter, 4774 mSDsluCounter, 3142 mSDsCounter, 0 mSdLazyCounter, 6127 mSolverCounterSat, 2181 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4774 SdHoareTripleChecker+Valid, 3374 SdHoareTripleChecker+Invalid, 8308 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2181 IncrementalHoareTripleChecker+Valid, 6127 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.7s IncrementalHoareTripleChecker+Time [2023-12-02 16:53:24,791 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4774 Valid, 3374 Invalid, 8308 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2181 Valid, 6127 Invalid, 0 Unknown, 0 Unchecked, 3.7s Time] [2023-12-02 16:53:24,795 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5263 states. [2023-12-02 16:53:25,153 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5263 to 3385. [2023-12-02 16:53:25,155 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3385 states, 2633 states have (on average 1.3551082415495632) internal successors, (3568), 2657 states have internal predecessors, (3568), 455 states have call successors, (455), 281 states have call predecessors, (455), 295 states have return successors, (596), 448 states have call predecessors, (596), 452 states have call successors, (596) [2023-12-02 16:53:25,162 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3385 states to 3385 states and 4619 transitions. [2023-12-02 16:53:25,162 INFO L78 Accepts]: Start accepts. Automaton has 3385 states and 4619 transitions. Word has length 114 [2023-12-02 16:53:25,162 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:53:25,163 INFO L495 AbstractCegarLoop]: Abstraction has 3385 states and 4619 transitions. [2023-12-02 16:53:25,163 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 33 states have (on average 5.909090909090909) internal successors, (195), 38 states have internal predecessors, (195), 19 states have call successors, (44), 14 states have call predecessors, (44), 22 states have return successors, (46), 19 states have call predecessors, (46), 19 states have call successors, (46) [2023-12-02 16:53:25,163 INFO L276 IsEmpty]: Start isEmpty. Operand 3385 states and 4619 transitions. [2023-12-02 16:53:25,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2023-12-02 16:53:25,169 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:53:25,169 INFO L195 NwaCegarLoop]: trace histogram [4, 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, 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] [2023-12-02 16:53:25,173 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2023-12-02 16:53:25,369 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:53:25,370 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:53:25,370 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:53:25,370 INFO L85 PathProgramCache]: Analyzing trace with hash -1840212783, now seen corresponding path program 1 times [2023-12-02 16:53:25,370 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:53:25,370 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [761521231] [2023-12-02 16:53:25,370 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:53:25,371 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:53:25,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:53:25,606 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 23 proven. 11 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-12-02 16:53:25,607 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:53:25,607 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [761521231] [2023-12-02 16:53:25,607 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [761521231] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:53:25,607 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [556163482] [2023-12-02 16:53:25,607 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:53:25,607 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:53:25,607 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:53:25,608 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:53:25,611 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-12-02 16:53:25,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:53:25,733 INFO L262 TraceCheckSpWp]: Trace formula consists of 489 conjuncts, 22 conjunts are in the unsatisfiable core [2023-12-02 16:53:25,735 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:53:25,798 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 35 proven. 2 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-12-02 16:53:25,798 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:53:25,970 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 25 proven. 0 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2023-12-02 16:53:25,970 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [556163482] provided 1 perfect and 1 imperfect interpolant sequences [2023-12-02 16:53:25,970 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-12-02 16:53:25,971 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [14, 8] total 20 [2023-12-02 16:53:25,971 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [150963000] [2023-12-02 16:53:25,971 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:53:25,971 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-12-02 16:53:25,971 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:53:25,972 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-12-02 16:53:25,972 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2023-12-02 16:53:25,972 INFO L87 Difference]: Start difference. First operand 3385 states and 4619 transitions. Second operand has 7 states, 6 states have (on average 11.5) internal successors, (69), 6 states have internal predecessors, (69), 4 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (15), 4 states have call predecessors, (15), 3 states have call successors, (15) [2023-12-02 16:53:26,945 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:53:26,945 INFO L93 Difference]: Finished difference Result 4709 states and 6167 transitions. [2023-12-02 16:53:26,946 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-12-02 16:53:26,946 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 11.5) internal successors, (69), 6 states have internal predecessors, (69), 4 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (15), 4 states have call predecessors, (15), 3 states have call successors, (15) Word has length 115 [2023-12-02 16:53:26,946 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:53:26,954 INFO L225 Difference]: With dead ends: 4709 [2023-12-02 16:53:26,954 INFO L226 Difference]: Without dead ends: 3718 [2023-12-02 16:53:26,956 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 252 GetRequests, 228 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=98, Invalid=552, Unknown=0, NotChecked=0, Total=650 [2023-12-02 16:53:26,957 INFO L413 NwaCegarLoop]: 214 mSDtfsCounter, 337 mSDsluCounter, 507 mSDsCounter, 0 mSdLazyCounter, 784 mSolverCounterSat, 82 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 340 SdHoareTripleChecker+Valid, 721 SdHoareTripleChecker+Invalid, 866 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 82 IncrementalHoareTripleChecker+Valid, 784 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-12-02 16:53:26,957 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [340 Valid, 721 Invalid, 866 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [82 Valid, 784 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-12-02 16:53:26,960 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3718 states. [2023-12-02 16:53:27,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3718 to 3465. [2023-12-02 16:53:27,335 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3465 states, 2678 states have (on average 1.3513816280806572) internal successors, (3619), 2705 states have internal predecessors, (3619), 474 states have call successors, (474), 290 states have call predecessors, (474), 311 states have return successors, (636), 471 states have call predecessors, (636), 471 states have call successors, (636) [2023-12-02 16:53:27,342 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3465 states to 3465 states and 4729 transitions. [2023-12-02 16:53:27,342 INFO L78 Accepts]: Start accepts. Automaton has 3465 states and 4729 transitions. Word has length 115 [2023-12-02 16:53:27,343 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:53:27,343 INFO L495 AbstractCegarLoop]: Abstraction has 3465 states and 4729 transitions. [2023-12-02 16:53:27,343 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 11.5) internal successors, (69), 6 states have internal predecessors, (69), 4 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (15), 4 states have call predecessors, (15), 3 states have call successors, (15) [2023-12-02 16:53:27,343 INFO L276 IsEmpty]: Start isEmpty. Operand 3465 states and 4729 transitions. [2023-12-02 16:53:27,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2023-12-02 16:53:27,348 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:53:27,349 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 16:53:27,354 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2023-12-02 16:53:27,549 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2023-12-02 16:53:27,549 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:53:27,550 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:53:27,550 INFO L85 PathProgramCache]: Analyzing trace with hash 430159195, now seen corresponding path program 1 times [2023-12-02 16:53:27,550 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:53:27,550 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1844766671] [2023-12-02 16:53:27,550 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:53:27,550 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:53:27,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:53:27,612 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2023-12-02 16:53:27,612 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:53:27,612 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1844766671] [2023-12-02 16:53:27,613 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1844766671] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:53:27,613 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 16:53:27,613 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 16:53:27,613 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [57974005] [2023-12-02 16:53:27,613 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:53:27,613 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:53:27,613 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:53:27,614 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:53:27,614 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 16:53:27,614 INFO L87 Difference]: Start difference. First operand 3465 states and 4729 transitions. Second operand has 3 states, 3 states have (on average 20.0) internal successors, (60), 3 states have internal predecessors, (60), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 16:53:28,272 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:53:28,272 INFO L93 Difference]: Finished difference Result 7930 states and 11534 transitions. [2023-12-02 16:53:28,273 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:53:28,273 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.0) internal successors, (60), 3 states have internal predecessors, (60), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 119 [2023-12-02 16:53:28,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:53:28,285 INFO L225 Difference]: With dead ends: 7930 [2023-12-02 16:53:28,285 INFO L226 Difference]: Without dead ends: 5653 [2023-12-02 16:53:28,291 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 16:53:28,292 INFO L413 NwaCegarLoop]: 218 mSDtfsCounter, 225 mSDsluCounter, 134 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 225 SdHoareTripleChecker+Valid, 352 SdHoareTripleChecker+Invalid, 74 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:53:28,292 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [225 Valid, 352 Invalid, 74 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 72 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:53:28,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5653 states. [2023-12-02 16:53:28,821 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5653 to 5621. [2023-12-02 16:53:28,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5621 states, 4450 states have (on average 1.3759550561797753) internal successors, (6123), 4489 states have internal predecessors, (6123), 730 states have call successors, (730), 418 states have call predecessors, (730), 439 states have return successors, (996), 715 states have call predecessors, (996), 727 states have call successors, (996) [2023-12-02 16:53:28,837 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5621 states to 5621 states and 7849 transitions. [2023-12-02 16:53:28,838 INFO L78 Accepts]: Start accepts. Automaton has 5621 states and 7849 transitions. Word has length 119 [2023-12-02 16:53:28,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:53:28,838 INFO L495 AbstractCegarLoop]: Abstraction has 5621 states and 7849 transitions. [2023-12-02 16:53:28,838 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.0) internal successors, (60), 3 states have internal predecessors, (60), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 16:53:28,838 INFO L276 IsEmpty]: Start isEmpty. Operand 5621 states and 7849 transitions. [2023-12-02 16:53:28,847 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2023-12-02 16:53:28,847 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:53:28,847 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:53:28,847 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2023-12-02 16:53:28,847 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:53:28,847 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:53:28,847 INFO L85 PathProgramCache]: Analyzing trace with hash -1461349508, now seen corresponding path program 1 times [2023-12-02 16:53:28,848 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:53:28,848 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2109206066] [2023-12-02 16:53:28,848 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:53:28,848 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:53:28,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:53:29,504 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 30 proven. 27 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2023-12-02 16:53:29,504 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:53:29,504 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2109206066] [2023-12-02 16:53:29,505 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2109206066] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:53:29,505 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1968751219] [2023-12-02 16:53:29,505 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:53:29,505 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:53:29,505 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:53:29,506 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:53:29,508 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-12-02 16:53:29,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:53:29,616 INFO L262 TraceCheckSpWp]: Trace formula consists of 517 conjuncts, 62 conjunts are in the unsatisfiable core [2023-12-02 16:53:29,620 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:53:30,357 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 60 proven. 23 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-12-02 16:53:30,357 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:53:31,875 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 13 proven. 44 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2023-12-02 16:53:31,875 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1968751219] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:53:31,875 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [306445743] [2023-12-02 16:53:31,878 INFO L159 IcfgInterpreter]: Started Sifa with 69 locations of interest [2023-12-02 16:53:31,878 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:53:31,879 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:53:31,879 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:53:31,879 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:53:42,987 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events1 with input of size 7 for LOIs [2023-12-02 16:53:42,990 INFO L197 IcfgInterpreter]: Interpreting procedure error1 with input of size 77 for LOIs [2023-12-02 16:53:43,028 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread1 with input of size 7 for LOIs [2023-12-02 16:53:43,031 INFO L197 IcfgInterpreter]: Interpreting procedure activate_threads1 with input of size 155 for LOIs [2023-12-02 16:53:43,882 INFO L197 IcfgInterpreter]: Interpreting procedure is_do_write_p_triggered with input of size 156 for LOIs [2023-12-02 16:53:44,738 INFO L197 IcfgInterpreter]: Interpreting procedure is_do_read_c_triggered with input of size 16 for LOIs [2023-12-02 16:53:44,766 INFO L197 IcfgInterpreter]: Interpreting procedure fire_delta_events1 with input of size 149 for LOIs [2023-12-02 16:53:44,917 INFO L197 IcfgInterpreter]: Interpreting procedure update_channels1 with input of size 160 for LOIs [2023-12-02 16:53:45,077 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:53:55,264 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '156077#(and (= ~q_req_up~0 1) (exists ((|v_ULTIMATE.start_eval1_~tmp___0~2#1_BEFORE_CALL_12| Int)) (and (not (= |v_ULTIMATE.start_eval1_~tmp___0~2#1_BEFORE_CALL_12| 0)) (<= |v_ULTIMATE.start_eval1_~tmp___0~2#1_BEFORE_CALL_12| 2147483647) (<= 0 (+ |v_ULTIMATE.start_eval1_~tmp___0~2#1_BEFORE_CALL_12| 2147483648)))) (exists ((|v_ULTIMATE.start_eval1_~tmp___1~0#1_BEFORE_CALL_10| Int) (v_~q_free~0_106 Int) (v_~q_req_up~0_103 Int) (|v_ULTIMATE.start_eval1_~tmp~2#1_BEFORE_CALL_10| Int)) (and (or (and (= v_~q_free~0_106 0) (= ~p_dw_pc~0 1) (= 2 ~p_dw_st~0)) (and (<= v_~q_free~0_106 1) (<= 0 ~p_dw_pc~0) (= |v_ULTIMATE.start_eval1_~tmp___1~0#1_BEFORE_CALL_10| 1) (= |v_ULTIMATE.start_eval1_~tmp~2#1_BEFORE_CALL_10| 0))) (or (exists ((v_~p_dw_pc~0_48 Int) (v_~p_dw_st~0_135 Int)) (and (not (= |v_ULTIMATE.start_eval1_~tmp~2#1_BEFORE_CALL_10| 0)) (or (and (<= |v_ULTIMATE.start_eval1_~tmp~2#1_BEFORE_CALL_10| 2147483647) (<= ~q_buf_0~0 2147483647) (= v_~p_dw_st~0_135 1) (<= 0 (+ ~p_last_write~0 2147483648)) (= |v_ULTIMATE.start_eval1_~tmp___1~0#1_BEFORE_CALL_10| 1) (<= 0 (+ |v_ULTIMATE.start_eval1_~tmp~2#1_BEFORE_CALL_10| 2147483648)) (= v_~p_dw_pc~0_48 1) (= v_~q_req_up~0_103 1)) (and (<= |v_ULTIMATE.start_eval1_~tmp~2#1_BEFORE_CALL_10| 2147483647) (= v_~p_dw_st~0_135 1) (= |v_ULTIMATE.start_eval1_~tmp___1~0#1_BEFORE_CALL_10| 1) (<= 0 (+ |v_ULTIMATE.start_eval1_~tmp~2#1_BEFORE_CALL_10| 2147483648)) (= v_~p_dw_pc~0_48 0))))) (= ~p_dw_st~0 0)))) (= ~q_free~0 1) (= ~c_dr_pc~0 1) (not (= ~c_num_read~0 ~p_num_write~0)) (= ~c_last_read~0 ~q_buf_0~0) (= ~c_last_read~0 ~p_last_write~0) (= ~c_dr_st~0 1))' at error location [2023-12-02 16:53:55,265 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:53:55,265 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:53:55,265 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 18, 18] total 55 [2023-12-02 16:53:55,265 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [160055396] [2023-12-02 16:53:55,265 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:53:55,266 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2023-12-02 16:53:55,266 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:53:55,267 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2023-12-02 16:53:55,267 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=999, Invalid=11433, Unknown=0, NotChecked=0, Total=12432 [2023-12-02 16:53:55,268 INFO L87 Difference]: Start difference. First operand 5621 states and 7849 transitions. Second operand has 55 states, 36 states have (on average 5.944444444444445) internal successors, (214), 40 states have internal predecessors, (214), 25 states have call successors, (49), 17 states have call predecessors, (49), 22 states have return successors, (51), 24 states have call predecessors, (51), 25 states have call successors, (51) [2023-12-02 16:54:05,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:54:05,774 INFO L93 Difference]: Finished difference Result 7905 states and 10551 transitions. [2023-12-02 16:54:05,774 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 153 states. [2023-12-02 16:54:05,774 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 36 states have (on average 5.944444444444445) internal successors, (214), 40 states have internal predecessors, (214), 25 states have call successors, (49), 17 states have call predecessors, (49), 22 states have return successors, (51), 24 states have call predecessors, (51), 25 states have call successors, (51) Word has length 124 [2023-12-02 16:54:05,774 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:54:05,788 INFO L225 Difference]: With dead ends: 7905 [2023-12-02 16:54:05,788 INFO L226 Difference]: Without dead ends: 6834 [2023-12-02 16:54:05,794 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 584 GetRequests, 322 SyntacticMatches, 1 SemanticMatches, 261 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 26934 ImplicationChecksByTransitivity, 16.9s TimeCoverageRelationStatistics Valid=6818, Invalid=62088, Unknown=0, NotChecked=0, Total=68906 [2023-12-02 16:54:05,795 INFO L413 NwaCegarLoop]: 202 mSDtfsCounter, 4243 mSDsluCounter, 2297 mSDsCounter, 0 mSdLazyCounter, 5444 mSolverCounterSat, 2226 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4243 SdHoareTripleChecker+Valid, 2499 SdHoareTripleChecker+Invalid, 7670 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2226 IncrementalHoareTripleChecker+Valid, 5444 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.4s IncrementalHoareTripleChecker+Time [2023-12-02 16:54:05,795 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4243 Valid, 2499 Invalid, 7670 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2226 Valid, 5444 Invalid, 0 Unknown, 0 Unchecked, 3.4s Time] [2023-12-02 16:54:05,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6834 states. [2023-12-02 16:54:06,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6834 to 5437. [2023-12-02 16:54:06,331 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5437 states, 4338 states have (on average 1.3819732595666205) internal successors, (5995), 4376 states have internal predecessors, (5995), 690 states have call successors, (690), 386 states have call predecessors, (690), 407 states have return successors, (946), 676 states have call predecessors, (946), 687 states have call successors, (946) [2023-12-02 16:54:06,343 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5437 states to 5437 states and 7631 transitions. [2023-12-02 16:54:06,343 INFO L78 Accepts]: Start accepts. Automaton has 5437 states and 7631 transitions. Word has length 124 [2023-12-02 16:54:06,343 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:54:06,343 INFO L495 AbstractCegarLoop]: Abstraction has 5437 states and 7631 transitions. [2023-12-02 16:54:06,343 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 36 states have (on average 5.944444444444445) internal successors, (214), 40 states have internal predecessors, (214), 25 states have call successors, (49), 17 states have call predecessors, (49), 22 states have return successors, (51), 24 states have call predecessors, (51), 25 states have call successors, (51) [2023-12-02 16:54:06,344 INFO L276 IsEmpty]: Start isEmpty. Operand 5437 states and 7631 transitions. [2023-12-02 16:54:06,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2023-12-02 16:54:06,352 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:54:06,352 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:54:06,357 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2023-12-02 16:54:06,553 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2023-12-02 16:54:06,553 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:54:06,553 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:54:06,553 INFO L85 PathProgramCache]: Analyzing trace with hash 1335613016, now seen corresponding path program 1 times [2023-12-02 16:54:06,553 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:54:06,553 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [387724502] [2023-12-02 16:54:06,554 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:54:06,554 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:54:06,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:54:06,742 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 38 proven. 9 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2023-12-02 16:54:06,743 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:54:06,743 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [387724502] [2023-12-02 16:54:06,743 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [387724502] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:54:06,743 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [615642007] [2023-12-02 16:54:06,743 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:54:06,743 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:54:06,743 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:54:06,744 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:54:06,747 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-12-02 16:54:06,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:54:06,883 INFO L262 TraceCheckSpWp]: Trace formula consists of 516 conjuncts, 23 conjunts are in the unsatisfiable core [2023-12-02 16:54:06,886 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:54:06,969 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 50 proven. 17 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2023-12-02 16:54:06,969 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:54:07,123 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 41 proven. 0 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2023-12-02 16:54:07,123 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [615642007] provided 1 perfect and 1 imperfect interpolant sequences [2023-12-02 16:54:07,123 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-12-02 16:54:07,124 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [9, 10] total 17 [2023-12-02 16:54:07,124 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1496147214] [2023-12-02 16:54:07,124 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:54:07,124 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-12-02 16:54:07,124 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:54:07,125 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-12-02 16:54:07,125 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2023-12-02 16:54:07,125 INFO L87 Difference]: Start difference. First operand 5437 states and 7631 transitions. Second operand has 8 states, 7 states have (on average 10.428571428571429) internal successors, (73), 7 states have internal predecessors, (73), 4 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (15), 4 states have call predecessors, (15), 3 states have call successors, (15) [2023-12-02 16:54:08,185 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:54:08,185 INFO L93 Difference]: Finished difference Result 6092 states and 8372 transitions. [2023-12-02 16:54:08,185 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-12-02 16:54:08,185 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 10.428571428571429) internal successors, (73), 7 states have internal predecessors, (73), 4 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (15), 4 states have call predecessors, (15), 3 states have call successors, (15) Word has length 125 [2023-12-02 16:54:08,185 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:54:08,199 INFO L225 Difference]: With dead ends: 6092 [2023-12-02 16:54:08,199 INFO L226 Difference]: Without dead ends: 5205 [2023-12-02 16:54:08,203 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 270 GetRequests, 247 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=109, Invalid=491, Unknown=0, NotChecked=0, Total=600 [2023-12-02 16:54:08,203 INFO L413 NwaCegarLoop]: 199 mSDtfsCounter, 534 mSDsluCounter, 369 mSDsCounter, 0 mSdLazyCounter, 757 mSolverCounterSat, 144 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 535 SdHoareTripleChecker+Valid, 568 SdHoareTripleChecker+Invalid, 901 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 144 IncrementalHoareTripleChecker+Valid, 757 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 16:54:08,203 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [535 Valid, 568 Invalid, 901 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [144 Valid, 757 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 16:54:08,208 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5205 states. [2023-12-02 16:54:08,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5205 to 5168. [2023-12-02 16:54:08,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5168 states, 4139 states have (on average 1.3892244503503262) internal successors, (5750), 4177 states have internal predecessors, (5750), 654 states have call successors, (654), 356 states have call predecessors, (654), 373 states have return successors, (905), 636 states have call predecessors, (905), 651 states have call successors, (905) [2023-12-02 16:54:08,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5168 states to 5168 states and 7309 transitions. [2023-12-02 16:54:08,861 INFO L78 Accepts]: Start accepts. Automaton has 5168 states and 7309 transitions. Word has length 125 [2023-12-02 16:54:08,862 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:54:08,862 INFO L495 AbstractCegarLoop]: Abstraction has 5168 states and 7309 transitions. [2023-12-02 16:54:08,862 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 10.428571428571429) internal successors, (73), 7 states have internal predecessors, (73), 4 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (15), 4 states have call predecessors, (15), 3 states have call successors, (15) [2023-12-02 16:54:08,862 INFO L276 IsEmpty]: Start isEmpty. Operand 5168 states and 7309 transitions. [2023-12-02 16:54:08,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2023-12-02 16:54:08,870 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:54:08,870 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 16:54:08,875 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2023-12-02 16:54:09,070 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2023-12-02 16:54:09,071 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:54:09,071 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:54:09,071 INFO L85 PathProgramCache]: Analyzing trace with hash -818801898, now seen corresponding path program 1 times [2023-12-02 16:54:09,071 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:54:09,071 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [578400049] [2023-12-02 16:54:09,071 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:54:09,071 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:54:09,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:54:09,125 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2023-12-02 16:54:09,125 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:54:09,126 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [578400049] [2023-12-02 16:54:09,126 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [578400049] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:54:09,126 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 16:54:09,126 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 16:54:09,126 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1297260297] [2023-12-02 16:54:09,126 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:54:09,126 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:54:09,127 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:54:09,127 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:54:09,127 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 16:54:09,127 INFO L87 Difference]: Start difference. First operand 5168 states and 7309 transitions. Second operand has 3 states, 3 states have (on average 20.0) internal successors, (60), 3 states have internal predecessors, (60), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 16:54:10,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:54:10,112 INFO L93 Difference]: Finished difference Result 13857 states and 20378 transitions. [2023-12-02 16:54:10,112 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:54:10,112 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.0) internal successors, (60), 3 states have internal predecessors, (60), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 119 [2023-12-02 16:54:10,113 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:54:10,128 INFO L225 Difference]: With dead ends: 13857 [2023-12-02 16:54:10,128 INFO L226 Difference]: Without dead ends: 9424 [2023-12-02 16:54:10,141 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 16:54:10,141 INFO L413 NwaCegarLoop]: 243 mSDtfsCounter, 228 mSDsluCounter, 134 mSDsCounter, 0 mSdLazyCounter, 73 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 228 SdHoareTripleChecker+Valid, 377 SdHoareTripleChecker+Invalid, 75 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 73 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:54:10,142 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [228 Valid, 377 Invalid, 75 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 73 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:54:10,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9424 states. [2023-12-02 16:54:11,016 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9424 to 9364. [2023-12-02 16:54:11,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9364 states, 7587 states have (on average 1.3926453143534994) internal successors, (10566), 7649 states have internal predecessors, (10566), 1146 states have call successors, (1146), 612 states have call predecessors, (1146), 629 states have return successors, (1589), 1104 states have call predecessors, (1589), 1143 states have call successors, (1589) [2023-12-02 16:54:11,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9364 states to 9364 states and 13301 transitions. [2023-12-02 16:54:11,041 INFO L78 Accepts]: Start accepts. Automaton has 9364 states and 13301 transitions. Word has length 119 [2023-12-02 16:54:11,041 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:54:11,041 INFO L495 AbstractCegarLoop]: Abstraction has 9364 states and 13301 transitions. [2023-12-02 16:54:11,041 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.0) internal successors, (60), 3 states have internal predecessors, (60), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 16:54:11,041 INFO L276 IsEmpty]: Start isEmpty. Operand 9364 states and 13301 transitions. [2023-12-02 16:54:11,059 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2023-12-02 16:54:11,059 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:54:11,059 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, 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] [2023-12-02 16:54:11,060 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2023-12-02 16:54:11,060 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:54:11,060 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:54:11,060 INFO L85 PathProgramCache]: Analyzing trace with hash -2141417988, now seen corresponding path program 1 times [2023-12-02 16:54:11,060 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:54:11,060 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2089291652] [2023-12-02 16:54:11,060 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:54:11,060 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:54:11,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:54:11,214 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 10 proven. 39 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2023-12-02 16:54:11,214 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:54:11,214 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2089291652] [2023-12-02 16:54:11,214 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2089291652] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:54:11,215 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [822829175] [2023-12-02 16:54:11,215 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:54:11,215 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:54:11,215 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:54:11,216 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:54:11,220 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-12-02 16:54:11,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:54:11,357 INFO L262 TraceCheckSpWp]: Trace formula consists of 720 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 16:54:11,360 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:54:11,389 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 79 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-12-02 16:54:11,389 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:54:11,389 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [822829175] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:54:11,389 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:54:11,389 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-12-02 16:54:11,389 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1302905772] [2023-12-02 16:54:11,389 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:54:11,390 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:54:11,390 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:54:11,390 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:54:11,390 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 16:54:11,390 INFO L87 Difference]: Start difference. First operand 9364 states and 13301 transitions. Second operand has 3 states, 3 states have (on average 33.333333333333336) internal successors, (100), 3 states have internal predecessors, (100), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 16:54:12,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:54:12,374 INFO L93 Difference]: Finished difference Result 13840 states and 20335 transitions. [2023-12-02 16:54:12,375 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:54:12,375 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 33.333333333333336) internal successors, (100), 3 states have internal predecessors, (100), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 135 [2023-12-02 16:54:12,375 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:54:12,391 INFO L225 Difference]: With dead ends: 13840 [2023-12-02 16:54:12,391 INFO L226 Difference]: Without dead ends: 9408 [2023-12-02 16:54:12,406 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 137 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 16:54:12,407 INFO L413 NwaCegarLoop]: 321 mSDtfsCounter, 137 mSDsluCounter, 210 mSDsCounter, 0 mSdLazyCounter, 107 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 137 SdHoareTripleChecker+Valid, 531 SdHoareTripleChecker+Invalid, 109 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 107 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:54:12,407 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [137 Valid, 531 Invalid, 109 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 107 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:54:12,415 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9408 states. [2023-12-02 16:54:13,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9408 to 9332. [2023-12-02 16:54:13,320 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9332 states, 7555 states have (on average 1.3741892786234282) internal successors, (10382), 7617 states have internal predecessors, (10382), 1146 states have call successors, (1146), 612 states have call predecessors, (1146), 629 states have return successors, (1589), 1104 states have call predecessors, (1589), 1143 states have call successors, (1589) [2023-12-02 16:54:13,340 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9332 states to 9332 states and 13117 transitions. [2023-12-02 16:54:13,341 INFO L78 Accepts]: Start accepts. Automaton has 9332 states and 13117 transitions. Word has length 135 [2023-12-02 16:54:13,341 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:54:13,341 INFO L495 AbstractCegarLoop]: Abstraction has 9332 states and 13117 transitions. [2023-12-02 16:54:13,341 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 33.333333333333336) internal successors, (100), 3 states have internal predecessors, (100), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 16:54:13,341 INFO L276 IsEmpty]: Start isEmpty. Operand 9332 states and 13117 transitions. [2023-12-02 16:54:13,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2023-12-02 16:54:13,357 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:54:13,357 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, 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] [2023-12-02 16:54:13,361 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2023-12-02 16:54:13,557 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2023-12-02 16:54:13,557 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:54:13,558 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:54:13,558 INFO L85 PathProgramCache]: Analyzing trace with hash 665206846, now seen corresponding path program 1 times [2023-12-02 16:54:13,558 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:54:13,558 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [955899121] [2023-12-02 16:54:13,558 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:54:13,558 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:54:13,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:54:13,714 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 10 proven. 37 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2023-12-02 16:54:13,714 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:54:13,715 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [955899121] [2023-12-02 16:54:13,715 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [955899121] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:54:13,715 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1339561105] [2023-12-02 16:54:13,715 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:54:13,715 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:54:13,715 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:54:13,717 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:54:13,724 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2023-12-02 16:54:13,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:54:13,874 INFO L262 TraceCheckSpWp]: Trace formula consists of 726 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 16:54:13,876 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:54:13,900 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 67 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-12-02 16:54:13,900 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:54:13,900 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1339561105] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:54:13,900 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:54:13,900 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-12-02 16:54:13,900 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1112628375] [2023-12-02 16:54:13,900 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:54:13,901 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:54:13,901 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:54:13,901 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:54:13,901 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 16:54:13,902 INFO L87 Difference]: Start difference. First operand 9332 states and 13117 transitions. Second operand has 3 states, 3 states have (on average 31.0) internal successors, (93), 3 states have internal predecessors, (93), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 16:54:15,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:54:15,226 INFO L93 Difference]: Finished difference Result 21909 states and 31488 transitions. [2023-12-02 16:54:15,226 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:54:15,227 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 31.0) internal successors, (93), 3 states have internal predecessors, (93), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 135 [2023-12-02 16:54:15,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:54:15,252 INFO L225 Difference]: With dead ends: 21909 [2023-12-02 16:54:15,252 INFO L226 Difference]: Without dead ends: 13313 [2023-12-02 16:54:15,271 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 137 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 16:54:15,272 INFO L413 NwaCegarLoop]: 232 mSDtfsCounter, 81 mSDsluCounter, 199 mSDsCounter, 0 mSdLazyCounter, 86 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 81 SdHoareTripleChecker+Valid, 431 SdHoareTripleChecker+Invalid, 88 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 86 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:54:15,272 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [81 Valid, 431 Invalid, 88 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 86 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:54:15,281 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13313 states. [2023-12-02 16:54:16,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13313 to 10860. [2023-12-02 16:54:16,342 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10860 states, 8983 states have (on average 1.4002003784927084) internal successors, (12578), 9046 states have internal predecessors, (12578), 1196 states have call successors, (1196), 662 states have call predecessors, (1196), 679 states have return successors, (1639), 1153 states have call predecessors, (1639), 1193 states have call successors, (1639) [2023-12-02 16:54:16,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10860 states to 10860 states and 15413 transitions. [2023-12-02 16:54:16,365 INFO L78 Accepts]: Start accepts. Automaton has 10860 states and 15413 transitions. Word has length 135 [2023-12-02 16:54:16,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:54:16,365 INFO L495 AbstractCegarLoop]: Abstraction has 10860 states and 15413 transitions. [2023-12-02 16:54:16,365 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 31.0) internal successors, (93), 3 states have internal predecessors, (93), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 16:54:16,366 INFO L276 IsEmpty]: Start isEmpty. Operand 10860 states and 15413 transitions. [2023-12-02 16:54:16,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2023-12-02 16:54:16,378 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:54:16,378 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, 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] [2023-12-02 16:54:16,383 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2023-12-02 16:54:16,578 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2023-12-02 16:54:16,579 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:54:16,579 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:54:16,579 INFO L85 PathProgramCache]: Analyzing trace with hash 216747421, now seen corresponding path program 2 times [2023-12-02 16:54:16,579 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:54:16,579 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1244799948] [2023-12-02 16:54:16,579 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:54:16,579 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:54:16,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:54:16,651 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 24 proven. 2 refuted. 0 times theorem prover too weak. 65 trivial. 0 not checked. [2023-12-02 16:54:16,651 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:54:16,651 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1244799948] [2023-12-02 16:54:16,651 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1244799948] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:54:16,651 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1749027289] [2023-12-02 16:54:16,651 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 16:54:16,651 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:54:16,652 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:54:16,652 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:54:16,655 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2023-12-02 16:54:16,808 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-12-02 16:54:16,808 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 16:54:16,811 INFO L262 TraceCheckSpWp]: Trace formula consists of 723 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 16:54:16,813 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:54:16,832 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 71 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-12-02 16:54:16,832 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:54:16,832 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1749027289] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:54:16,832 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:54:16,832 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2023-12-02 16:54:16,833 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1027960103] [2023-12-02 16:54:16,833 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:54:16,833 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:54:16,833 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:54:16,834 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:54:16,834 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-12-02 16:54:16,834 INFO L87 Difference]: Start difference. First operand 10860 states and 15413 transitions. Second operand has 3 states, 3 states have (on average 31.0) internal successors, (93), 3 states have internal predecessors, (93), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 16:54:18,242 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:54:18,242 INFO L93 Difference]: Finished difference Result 19636 states and 28387 transitions. [2023-12-02 16:54:18,242 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:54:18,243 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 31.0) internal successors, (93), 3 states have internal predecessors, (93), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 135 [2023-12-02 16:54:18,243 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:54:18,266 INFO L225 Difference]: With dead ends: 19636 [2023-12-02 16:54:18,266 INFO L226 Difference]: Without dead ends: 14516 [2023-12-02 16:54:18,277 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 135 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 16:54:18,277 INFO L413 NwaCegarLoop]: 309 mSDtfsCounter, 90 mSDsluCounter, 222 mSDsCounter, 0 mSdLazyCounter, 101 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 90 SdHoareTripleChecker+Valid, 531 SdHoareTripleChecker+Invalid, 101 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 101 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:54:18,278 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [90 Valid, 531 Invalid, 101 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 101 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:54:18,289 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14516 states. [2023-12-02 16:54:19,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14516 to 13340. [2023-12-02 16:54:19,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13340 states, 11303 states have (on average 1.427054764221888) internal successors, (16130), 11366 states have internal predecessors, (16130), 1276 states have call successors, (1276), 742 states have call predecessors, (1276), 759 states have return successors, (1719), 1233 states have call predecessors, (1719), 1273 states have call successors, (1719) [2023-12-02 16:54:19,518 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13340 states to 13340 states and 19125 transitions. [2023-12-02 16:54:19,519 INFO L78 Accepts]: Start accepts. Automaton has 13340 states and 19125 transitions. Word has length 135 [2023-12-02 16:54:19,520 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:54:19,520 INFO L495 AbstractCegarLoop]: Abstraction has 13340 states and 19125 transitions. [2023-12-02 16:54:19,520 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 31.0) internal successors, (93), 3 states have internal predecessors, (93), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 16:54:19,520 INFO L276 IsEmpty]: Start isEmpty. Operand 13340 states and 19125 transitions. [2023-12-02 16:54:19,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2023-12-02 16:54:19,534 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:54:19,535 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, 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] [2023-12-02 16:54:19,541 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2023-12-02 16:54:19,735 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2023-12-02 16:54:19,735 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:54:19,736 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:54:19,736 INFO L85 PathProgramCache]: Analyzing trace with hash 258905432, now seen corresponding path program 1 times [2023-12-02 16:54:19,736 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:54:19,736 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [303833859] [2023-12-02 16:54:19,736 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:54:19,736 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:54:19,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:54:19,805 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 23 proven. 3 refuted. 0 times theorem prover too weak. 65 trivial. 0 not checked. [2023-12-02 16:54:19,805 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:54:19,805 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [303833859] [2023-12-02 16:54:19,806 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [303833859] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:54:19,806 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [602951575] [2023-12-02 16:54:19,806 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:54:19,806 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:54:19,806 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:54:19,807 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:54:19,808 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2023-12-02 16:54:19,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:54:19,961 INFO L262 TraceCheckSpWp]: Trace formula consists of 723 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 16:54:19,963 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:54:19,980 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 71 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-12-02 16:54:19,980 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:54:19,980 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [602951575] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:54:19,980 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:54:19,981 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2023-12-02 16:54:19,981 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [837728031] [2023-12-02 16:54:19,981 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:54:19,981 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:54:19,981 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:54:19,982 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:54:19,982 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-12-02 16:54:19,982 INFO L87 Difference]: Start difference. First operand 13340 states and 19125 transitions. Second operand has 3 states, 3 states have (on average 31.0) internal successors, (93), 3 states have internal predecessors, (93), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 16:54:21,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:54:21,573 INFO L93 Difference]: Finished difference Result 24576 states and 35711 transitions. [2023-12-02 16:54:21,574 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:54:21,574 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 31.0) internal successors, (93), 3 states have internal predecessors, (93), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 135 [2023-12-02 16:54:21,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:54:21,603 INFO L225 Difference]: With dead ends: 24576 [2023-12-02 16:54:21,603 INFO L226 Difference]: Without dead ends: 18156 [2023-12-02 16:54:21,614 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 135 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 16:54:21,615 INFO L413 NwaCegarLoop]: 315 mSDtfsCounter, 96 mSDsluCounter, 223 mSDsCounter, 0 mSdLazyCounter, 102 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 96 SdHoareTripleChecker+Valid, 538 SdHoareTripleChecker+Invalid, 102 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 102 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:54:21,615 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [96 Valid, 538 Invalid, 102 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 102 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:54:21,628 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18156 states. [2023-12-02 16:54:23,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18156 to 16800. [2023-12-02 16:54:23,070 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16800 states, 14523 states have (on average 1.44171314466708) internal successors, (20938), 14586 states have internal predecessors, (20938), 1396 states have call successors, (1396), 862 states have call predecessors, (1396), 879 states have return successors, (1839), 1353 states have call predecessors, (1839), 1393 states have call successors, (1839) [2023-12-02 16:54:23,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16800 states to 16800 states and 24173 transitions. [2023-12-02 16:54:23,105 INFO L78 Accepts]: Start accepts. Automaton has 16800 states and 24173 transitions. Word has length 135 [2023-12-02 16:54:23,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:54:23,105 INFO L495 AbstractCegarLoop]: Abstraction has 16800 states and 24173 transitions. [2023-12-02 16:54:23,105 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 31.0) internal successors, (93), 3 states have internal predecessors, (93), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 16:54:23,105 INFO L276 IsEmpty]: Start isEmpty. Operand 16800 states and 24173 transitions. [2023-12-02 16:54:23,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2023-12-02 16:54:23,130 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:54:23,130 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, 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] [2023-12-02 16:54:23,135 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2023-12-02 16:54:23,330 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:54:23,331 INFO L420 AbstractCegarLoop]: === Iteration 31 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:54:23,331 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:54:23,331 INFO L85 PathProgramCache]: Analyzing trace with hash 987446217, now seen corresponding path program 1 times [2023-12-02 16:54:23,331 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:54:23,331 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [785505685] [2023-12-02 16:54:23,331 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:54:23,331 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:54:23,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:54:23,400 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 21 proven. 5 refuted. 0 times theorem prover too weak. 67 trivial. 0 not checked. [2023-12-02 16:54:23,400 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:54:23,400 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [785505685] [2023-12-02 16:54:23,400 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [785505685] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:54:23,400 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [607173358] [2023-12-02 16:54:23,400 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:54:23,400 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:54:23,401 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:54:23,401 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:54:23,404 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2023-12-02 16:54:23,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:54:23,596 INFO L262 TraceCheckSpWp]: Trace formula consists of 720 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 16:54:23,598 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:54:23,613 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 73 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-12-02 16:54:23,613 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:54:23,613 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [607173358] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:54:23,613 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:54:23,613 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2023-12-02 16:54:23,613 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1316707273] [2023-12-02 16:54:23,614 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:54:23,614 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:54:23,614 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:54:23,614 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:54:23,614 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-12-02 16:54:23,615 INFO L87 Difference]: Start difference. First operand 16800 states and 24173 transitions. Second operand has 3 states, 3 states have (on average 31.0) internal successors, (93), 3 states have internal predecessors, (93), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 16:54:25,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:54:25,533 INFO L93 Difference]: Finished difference Result 31776 states and 46227 transitions. [2023-12-02 16:54:25,533 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:54:25,533 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 31.0) internal successors, (93), 3 states have internal predecessors, (93), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 135 [2023-12-02 16:54:25,533 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:54:25,567 INFO L225 Difference]: With dead ends: 31776 [2023-12-02 16:54:25,567 INFO L226 Difference]: Without dead ends: 23506 [2023-12-02 16:54:25,578 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 135 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 16:54:25,578 INFO L413 NwaCegarLoop]: 314 mSDtfsCounter, 108 mSDsluCounter, 223 mSDsCounter, 0 mSdLazyCounter, 103 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 108 SdHoareTripleChecker+Valid, 537 SdHoareTripleChecker+Invalid, 103 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 103 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:54:25,578 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [108 Valid, 537 Invalid, 103 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 103 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:54:25,592 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23506 states. [2023-12-02 16:54:27,368 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23506 to 21870. [2023-12-02 16:54:27,381 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21870 states, 19233 states have (on average 1.4511516664066968) internal successors, (27910), 19296 states have internal predecessors, (27910), 1576 states have call successors, (1576), 1042 states have call predecessors, (1576), 1059 states have return successors, (2019), 1533 states have call predecessors, (2019), 1573 states have call successors, (2019) [2023-12-02 16:54:27,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21870 states to 21870 states and 31505 transitions. [2023-12-02 16:54:27,421 INFO L78 Accepts]: Start accepts. Automaton has 21870 states and 31505 transitions. Word has length 135 [2023-12-02 16:54:27,422 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:54:27,422 INFO L495 AbstractCegarLoop]: Abstraction has 21870 states and 31505 transitions. [2023-12-02 16:54:27,422 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 31.0) internal successors, (93), 3 states have internal predecessors, (93), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 16:54:27,422 INFO L276 IsEmpty]: Start isEmpty. Operand 21870 states and 31505 transitions. [2023-12-02 16:54:27,441 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2023-12-02 16:54:27,442 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:54:27,442 INFO L195 NwaCegarLoop]: trace histogram [5, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 16:54:27,447 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2023-12-02 16:54:27,642 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:54:27,642 INFO L420 AbstractCegarLoop]: === Iteration 32 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:54:27,643 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:54:27,643 INFO L85 PathProgramCache]: Analyzing trace with hash 1930064159, now seen corresponding path program 1 times [2023-12-02 16:54:27,643 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:54:27,643 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1748865041] [2023-12-02 16:54:27,643 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:54:27,643 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:54:27,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:54:28,012 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 12 proven. 38 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2023-12-02 16:54:28,012 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:54:28,012 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1748865041] [2023-12-02 16:54:28,012 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1748865041] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:54:28,012 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1320624886] [2023-12-02 16:54:28,012 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:54:28,012 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:54:28,013 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:54:28,013 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:54:28,014 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2023-12-02 16:54:28,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:54:28,162 INFO L262 TraceCheckSpWp]: Trace formula consists of 821 conjuncts, 24 conjunts are in the unsatisfiable core [2023-12-02 16:54:28,165 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:54:28,257 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 64 proven. 14 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2023-12-02 16:54:28,257 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:54:28,491 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 13 proven. 38 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2023-12-02 16:54:28,491 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1320624886] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:54:28,491 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1813617372] [2023-12-02 16:54:28,494 INFO L159 IcfgInterpreter]: Started Sifa with 75 locations of interest [2023-12-02 16:54:28,495 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:54:28,495 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:54:28,495 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:54:28,495 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:54:38,791 INFO L197 IcfgInterpreter]: Interpreting procedure error2 with input of size 30 for LOIs [2023-12-02 16:54:38,794 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events2 with input of size 1 for LOIs [2023-12-02 16:54:38,800 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread2 with input of size 1 for LOIs [2023-12-02 16:54:38,816 INFO L197 IcfgInterpreter]: Interpreting procedure update_channels2 with input of size 1 for LOIs [2023-12-02 16:54:38,816 INFO L197 IcfgInterpreter]: Interpreting procedure immediate_notify with input of size 49 for LOIs [2023-12-02 16:54:38,894 INFO L197 IcfgInterpreter]: Interpreting procedure activate_threads2 with input of size 1 for LOIs [2023-12-02 16:54:38,999 INFO L197 IcfgInterpreter]: Interpreting procedure fire_delta_events2 with input of size 168 for LOIs [2023-12-02 16:54:39,126 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:54:46,556 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '444891#(and (= ~m_pc~0 1) (exists ((|v_ULTIMATE.start_eval2_~tmp~5#1_BEFORE_CALL_17| Int)) (and (<= 0 |v_ULTIMATE.start_eval2_~tmp~5#1_BEFORE_CALL_17|) (<= |v_ULTIMATE.start_eval2_~tmp~5#1_BEFORE_CALL_17| 1) (not (= |v_ULTIMATE.start_eval2_~tmp~5#1_BEFORE_CALL_17| 0)))) (= ~m_st~0 1) (exists ((|v_ULTIMATE.start_eval2_~tmp_ndt_1~0#1_BEFORE_CALL_9| Int)) (and (<= |v_ULTIMATE.start_eval2_~tmp_ndt_1~0#1_BEFORE_CALL_9| 2147483647) (not (= |v_ULTIMATE.start_eval2_~tmp_ndt_1~0#1_BEFORE_CALL_9| 0)) (<= 0 (+ |v_ULTIMATE.start_eval2_~tmp_ndt_1~0#1_BEFORE_CALL_9| 2147483648)))) (not (= ~token~0 (+ 5 ~local~0))))' at error location [2023-12-02 16:54:46,556 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:54:46,556 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:54:46,556 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7, 6] total 9 [2023-12-02 16:54:46,556 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1401508439] [2023-12-02 16:54:46,556 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:54:46,557 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-12-02 16:54:46,557 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:54:46,558 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-12-02 16:54:46,558 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=343, Invalid=4213, Unknown=0, NotChecked=0, Total=4556 [2023-12-02 16:54:46,558 INFO L87 Difference]: Start difference. First operand 21870 states and 31505 transitions. Second operand has 9 states, 9 states have (on average 16.0) internal successors, (144), 9 states have internal predecessors, (144), 5 states have call successors, (29), 6 states have call predecessors, (29), 7 states have return successors, (30), 6 states have call predecessors, (30), 5 states have call successors, (30) [2023-12-02 16:54:49,909 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:54:49,910 INFO L93 Difference]: Finished difference Result 55158 states and 79799 transitions. [2023-12-02 16:54:49,910 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-12-02 16:54:49,910 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 16.0) internal successors, (144), 9 states have internal predecessors, (144), 5 states have call successors, (29), 6 states have call predecessors, (29), 7 states have return successors, (30), 6 states have call predecessors, (30), 5 states have call successors, (30) Word has length 139 [2023-12-02 16:54:49,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:54:49,967 INFO L225 Difference]: With dead ends: 55158 [2023-12-02 16:54:49,968 INFO L226 Difference]: Without dead ends: 34024 [2023-12-02 16:54:49,993 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 439 GetRequests, 366 SyntacticMatches, 0 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1883 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=413, Invalid=5137, Unknown=0, NotChecked=0, Total=5550 [2023-12-02 16:54:49,993 INFO L413 NwaCegarLoop]: 206 mSDtfsCounter, 648 mSDsluCounter, 574 mSDsCounter, 0 mSdLazyCounter, 454 mSolverCounterSat, 171 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 676 SdHoareTripleChecker+Valid, 780 SdHoareTripleChecker+Invalid, 625 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 171 IncrementalHoareTripleChecker+Valid, 454 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 16:54:49,994 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [676 Valid, 780 Invalid, 625 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [171 Valid, 454 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 16:54:50,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34024 states. [2023-12-02 16:54:52,862 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34024 to 33412. [2023-12-02 16:54:52,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33412 states, 29359 states have (on average 1.4269559589904288) internal successors, (41894), 29454 states have internal predecessors, (41894), 2428 states have call successors, (2428), 1606 states have call predecessors, (2428), 1623 states have return successors, (3159), 2353 states have call predecessors, (3159), 2425 states have call successors, (3159) [2023-12-02 16:54:52,945 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33412 states to 33412 states and 47481 transitions. [2023-12-02 16:54:52,946 INFO L78 Accepts]: Start accepts. Automaton has 33412 states and 47481 transitions. Word has length 139 [2023-12-02 16:54:52,946 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:54:52,946 INFO L495 AbstractCegarLoop]: Abstraction has 33412 states and 47481 transitions. [2023-12-02 16:54:52,946 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 16.0) internal successors, (144), 9 states have internal predecessors, (144), 5 states have call successors, (29), 6 states have call predecessors, (29), 7 states have return successors, (30), 6 states have call predecessors, (30), 5 states have call successors, (30) [2023-12-02 16:54:52,946 INFO L276 IsEmpty]: Start isEmpty. Operand 33412 states and 47481 transitions. [2023-12-02 16:54:52,976 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2023-12-02 16:54:52,976 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:54:52,976 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, 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] [2023-12-02 16:54:52,981 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2023-12-02 16:54:53,176 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2023-12-02 16:54:53,177 INFO L420 AbstractCegarLoop]: === Iteration 33 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:54:53,177 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:54:53,177 INFO L85 PathProgramCache]: Analyzing trace with hash 1272670822, now seen corresponding path program 1 times [2023-12-02 16:54:53,177 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:54:53,177 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [965001931] [2023-12-02 16:54:53,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:54:53,177 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:54:53,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:54:53,314 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 15 proven. 37 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2023-12-02 16:54:53,314 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:54:53,315 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [965001931] [2023-12-02 16:54:53,315 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [965001931] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:54:53,315 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1129706501] [2023-12-02 16:54:53,315 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:54:53,315 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:54:53,315 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:54:53,316 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:54:53,318 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2023-12-02 16:54:53,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:54:53,456 INFO L262 TraceCheckSpWp]: Trace formula consists of 745 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 16:54:53,458 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:54:53,484 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 67 proven. 0 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2023-12-02 16:54:53,484 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:54:53,485 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1129706501] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:54:53,485 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:54:53,485 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-12-02 16:54:53,485 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1657261407] [2023-12-02 16:54:53,485 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:54:53,485 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:54:53,485 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:54:53,486 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:54:53,486 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 16:54:53,486 INFO L87 Difference]: Start difference. First operand 33412 states and 47481 transitions. Second operand has 3 states, 3 states have (on average 32.0) internal successors, (96), 3 states have internal predecessors, (96), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 16:54:56,592 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:54:56,593 INFO L93 Difference]: Finished difference Result 60940 states and 86912 transitions. [2023-12-02 16:54:56,593 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:54:56,593 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 32.0) internal successors, (96), 3 states have internal predecessors, (96), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 141 [2023-12-02 16:54:56,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:54:56,645 INFO L225 Difference]: With dead ends: 60940 [2023-12-02 16:54:56,645 INFO L226 Difference]: Without dead ends: 36708 [2023-12-02 16:54:56,667 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 143 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 16:54:56,667 INFO L413 NwaCegarLoop]: 233 mSDtfsCounter, 234 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 234 SdHoareTripleChecker+Valid, 267 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:54:56,668 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [234 Valid, 267 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:54:56,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36708 states. [2023-12-02 16:54:59,635 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36708 to 36244. [2023-12-02 16:54:59,654 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36244 states, 31882 states have (on average 1.410984254438241) internal successors, (44985), 31961 states have internal predecessors, (44985), 2518 states have call successors, (2518), 1824 states have call predecessors, (2518), 1842 states have return successors, (3292), 2460 states have call predecessors, (3292), 2515 states have call successors, (3292) [2023-12-02 16:54:59,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36244 states to 36244 states and 50795 transitions. [2023-12-02 16:54:59,724 INFO L78 Accepts]: Start accepts. Automaton has 36244 states and 50795 transitions. Word has length 141 [2023-12-02 16:54:59,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:54:59,724 INFO L495 AbstractCegarLoop]: Abstraction has 36244 states and 50795 transitions. [2023-12-02 16:54:59,724 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 32.0) internal successors, (96), 3 states have internal predecessors, (96), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 16:54:59,725 INFO L276 IsEmpty]: Start isEmpty. Operand 36244 states and 50795 transitions. [2023-12-02 16:54:59,756 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2023-12-02 16:54:59,756 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:54:59,756 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, 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] [2023-12-02 16:54:59,761 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2023-12-02 16:54:59,956 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:54:59,957 INFO L420 AbstractCegarLoop]: === Iteration 34 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:54:59,957 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:54:59,957 INFO L85 PathProgramCache]: Analyzing trace with hash -355979451, now seen corresponding path program 2 times [2023-12-02 16:54:59,957 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:54:59,957 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [406048017] [2023-12-02 16:54:59,957 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:54:59,957 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:54:59,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:55:00,093 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 15 proven. 38 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2023-12-02 16:55:00,093 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:55:00,093 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [406048017] [2023-12-02 16:55:00,093 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [406048017] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:55:00,094 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [866736705] [2023-12-02 16:55:00,094 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 16:55:00,094 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:55:00,094 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:55:00,095 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:55:00,100 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2023-12-02 16:55:00,244 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-12-02 16:55:00,244 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 16:55:00,246 INFO L262 TraceCheckSpWp]: Trace formula consists of 483 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 16:55:00,250 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:55:00,292 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 81 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2023-12-02 16:55:00,292 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:55:00,292 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [866736705] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:55:00,293 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:55:00,293 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-12-02 16:55:00,293 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [487943934] [2023-12-02 16:55:00,293 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:55:00,293 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:55:00,293 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:55:00,294 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:55:00,294 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 16:55:00,294 INFO L87 Difference]: Start difference. First operand 36244 states and 50795 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, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 16:55:04,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:55:04,093 INFO L93 Difference]: Finished difference Result 68347 states and 97012 transitions. [2023-12-02 16:55:04,094 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:55:04,094 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, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 141 [2023-12-02 16:55:04,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:55:04,166 INFO L225 Difference]: With dead ends: 68347 [2023-12-02 16:55:04,166 INFO L226 Difference]: Without dead ends: 42093 [2023-12-02 16:55:04,194 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 143 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 16:55:04,195 INFO L413 NwaCegarLoop]: 316 mSDtfsCounter, 130 mSDsluCounter, 208 mSDsCounter, 0 mSdLazyCounter, 105 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 130 SdHoareTripleChecker+Valid, 524 SdHoareTripleChecker+Invalid, 109 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 105 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:55:04,195 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [130 Valid, 524 Invalid, 109 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 105 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:55:04,223 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42093 states. [2023-12-02 16:55:07,585 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42093 to 41465. [2023-12-02 16:55:07,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41465 states, 36522 states have (on average 1.402414982750123) internal successors, (51219), 36617 states have internal predecessors, (51219), 2849 states have call successors, (2849), 2075 states have call predecessors, (2849), 2092 states have return successors, (3892), 2774 states have call predecessors, (3892), 2846 states have call successors, (3892) [2023-12-02 16:55:07,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41465 states to 41465 states and 57960 transitions. [2023-12-02 16:55:07,848 INFO L78 Accepts]: Start accepts. Automaton has 41465 states and 57960 transitions. Word has length 141 [2023-12-02 16:55:07,848 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:55:07,848 INFO L495 AbstractCegarLoop]: Abstraction has 41465 states and 57960 transitions. [2023-12-02 16:55:07,848 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, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 16:55:07,848 INFO L276 IsEmpty]: Start isEmpty. Operand 41465 states and 57960 transitions. [2023-12-02 16:55:07,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2023-12-02 16:55:07,875 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:55:07,875 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, 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] [2023-12-02 16:55:07,879 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2023-12-02 16:55:08,075 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2023-12-02 16:55:08,076 INFO L420 AbstractCegarLoop]: === Iteration 35 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:55:08,076 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:55:08,076 INFO L85 PathProgramCache]: Analyzing trace with hash -1384164895, now seen corresponding path program 1 times [2023-12-02 16:55:08,076 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:55:08,076 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [263890529] [2023-12-02 16:55:08,076 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:55:08,076 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:55:08,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:55:08,287 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 15 proven. 38 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2023-12-02 16:55:08,287 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:55:08,287 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [263890529] [2023-12-02 16:55:08,287 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [263890529] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:55:08,287 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2048766356] [2023-12-02 16:55:08,288 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:55:08,288 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:55:08,288 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:55:08,288 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:55:08,289 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2023-12-02 16:55:08,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:55:08,430 INFO L262 TraceCheckSpWp]: Trace formula consists of 744 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 16:55:08,432 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:55:08,466 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 90 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-12-02 16:55:08,466 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:55:08,466 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2048766356] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:55:08,466 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:55:08,466 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-12-02 16:55:08,466 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [152663094] [2023-12-02 16:55:08,466 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:55:08,467 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:55:08,467 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:55:08,467 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:55:08,467 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 16:55:08,467 INFO L87 Difference]: Start difference. First operand 41465 states and 57960 transitions. Second operand has 3 states, 3 states have (on average 38.666666666666664) internal successors, (116), 3 states have internal predecessors, (116), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 16:55:12,087 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:55:12,087 INFO L93 Difference]: Finished difference Result 66765 states and 94886 transitions. [2023-12-02 16:55:12,088 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:55:12,088 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 38.666666666666664) internal successors, (116), 3 states have internal predecessors, (116), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 142 [2023-12-02 16:55:12,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:55:12,148 INFO L225 Difference]: With dead ends: 66765 [2023-12-02 16:55:12,148 INFO L226 Difference]: Without dead ends: 41541 [2023-12-02 16:55:12,170 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 16:55:12,171 INFO L413 NwaCegarLoop]: 333 mSDtfsCounter, 130 mSDsluCounter, 209 mSDsCounter, 0 mSdLazyCounter, 107 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 130 SdHoareTripleChecker+Valid, 542 SdHoareTripleChecker+Invalid, 109 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 107 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:55:12,171 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [130 Valid, 542 Invalid, 109 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 107 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:55:12,196 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41541 states. [2023-12-02 16:55:15,574 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41541 to 40961. [2023-12-02 16:55:15,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40961 states, 36018 states have (on average 1.3860569715142428) internal successors, (49923), 36113 states have internal predecessors, (49923), 2849 states have call successors, (2849), 2075 states have call predecessors, (2849), 2092 states have return successors, (3892), 2774 states have call predecessors, (3892), 2846 states have call successors, (3892) [2023-12-02 16:55:15,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40961 states to 40961 states and 56664 transitions. [2023-12-02 16:55:15,679 INFO L78 Accepts]: Start accepts. Automaton has 40961 states and 56664 transitions. Word has length 142 [2023-12-02 16:55:15,679 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:55:15,679 INFO L495 AbstractCegarLoop]: Abstraction has 40961 states and 56664 transitions. [2023-12-02 16:55:15,679 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 38.666666666666664) internal successors, (116), 3 states have internal predecessors, (116), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 16:55:15,679 INFO L276 IsEmpty]: Start isEmpty. Operand 40961 states and 56664 transitions. [2023-12-02 16:55:15,710 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2023-12-02 16:55:15,710 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:55:15,710 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 16:55:15,716 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Ended with exit code 0 [2023-12-02 16:55:15,910 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2023-12-02 16:55:15,911 INFO L420 AbstractCegarLoop]: === Iteration 36 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:55:15,911 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:55:15,911 INFO L85 PathProgramCache]: Analyzing trace with hash -129130845, now seen corresponding path program 1 times [2023-12-02 16:55:15,911 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:55:15,911 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [425206928] [2023-12-02 16:55:15,912 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:55:15,912 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:55:15,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:55:16,042 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 15 proven. 36 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2023-12-02 16:55:16,042 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:55:16,043 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [425206928] [2023-12-02 16:55:16,043 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [425206928] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:55:16,043 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [232093835] [2023-12-02 16:55:16,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:55:16,043 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:55:16,043 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:55:16,044 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:55:16,045 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2023-12-02 16:55:16,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:55:16,179 INFO L262 TraceCheckSpWp]: Trace formula consists of 750 conjuncts, 8 conjunts are in the unsatisfiable core [2023-12-02 16:55:16,181 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:55:16,206 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 80 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2023-12-02 16:55:16,206 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:55:16,206 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [232093835] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:55:16,206 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:55:16,206 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 8 [2023-12-02 16:55:16,206 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1576425194] [2023-12-02 16:55:16,206 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:55:16,207 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 16:55:16,207 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:55:16,207 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 16:55:16,207 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2023-12-02 16:55:16,207 INFO L87 Difference]: Start difference. First operand 40961 states and 56664 transitions. Second operand has 4 states, 4 states have (on average 27.5) internal successors, (110), 4 states have internal predecessors, (110), 2 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) [2023-12-02 16:55:19,652 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:55:19,652 INFO L93 Difference]: Finished difference Result 59023 states and 81299 transitions. [2023-12-02 16:55:19,653 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-12-02 16:55:19,654 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 27.5) internal successors, (110), 4 states have internal predecessors, (110), 2 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) Word has length 142 [2023-12-02 16:55:19,654 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:55:19,716 INFO L225 Difference]: With dead ends: 59023 [2023-12-02 16:55:19,716 INFO L226 Difference]: Without dead ends: 41721 [2023-12-02 16:55:19,732 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 143 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 16:55:19,733 INFO L413 NwaCegarLoop]: 288 mSDtfsCounter, 221 mSDsluCounter, 423 mSDsCounter, 0 mSdLazyCounter, 150 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 221 SdHoareTripleChecker+Valid, 711 SdHoareTripleChecker+Invalid, 153 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 150 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:55:19,733 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [221 Valid, 711 Invalid, 153 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 150 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:55:19,760 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41721 states. [2023-12-02 16:55:23,199 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41721 to 41581. [2023-12-02 16:55:23,221 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41581 states, 36563 states have (on average 1.3829827968164539) internal successors, (50566), 36690 states have internal predecessors, (50566), 2856 states have call successors, (2856), 2079 states have call predecessors, (2856), 2160 states have return successors, (3995), 2813 states have call predecessors, (3995), 2853 states have call successors, (3995) [2023-12-02 16:55:23,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41581 states to 41581 states and 57417 transitions. [2023-12-02 16:55:23,307 INFO L78 Accepts]: Start accepts. Automaton has 41581 states and 57417 transitions. Word has length 142 [2023-12-02 16:55:23,307 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:55:23,307 INFO L495 AbstractCegarLoop]: Abstraction has 41581 states and 57417 transitions. [2023-12-02 16:55:23,307 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 27.5) internal successors, (110), 4 states have internal predecessors, (110), 2 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) [2023-12-02 16:55:23,307 INFO L276 IsEmpty]: Start isEmpty. Operand 41581 states and 57417 transitions. [2023-12-02 16:55:23,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2023-12-02 16:55:23,339 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:55:23,339 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, 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 16:55:23,345 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2023-12-02 16:55:23,540 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:55:23,540 INFO L420 AbstractCegarLoop]: === Iteration 37 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:55:23,540 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:55:23,540 INFO L85 PathProgramCache]: Analyzing trace with hash -1369829286, now seen corresponding path program 1 times [2023-12-02 16:55:23,541 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:55:23,541 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1191965634] [2023-12-02 16:55:23,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:55:23,541 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:55:23,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:55:23,670 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 15 proven. 37 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2023-12-02 16:55:23,670 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:55:23,670 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1191965634] [2023-12-02 16:55:23,670 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1191965634] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:55:23,670 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [334822064] [2023-12-02 16:55:23,670 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:55:23,670 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:55:23,671 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:55:23,671 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:55:23,672 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2023-12-02 16:55:23,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:55:23,819 INFO L262 TraceCheckSpWp]: Trace formula consists of 749 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 16:55:23,822 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:55:23,835 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 70 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-12-02 16:55:23,835 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:55:23,836 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [334822064] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:55:23,836 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:55:23,836 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-12-02 16:55:23,836 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [506361548] [2023-12-02 16:55:23,836 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:55:23,836 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:55:23,836 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:55:23,837 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:55:23,837 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 16:55:23,837 INFO L87 Difference]: Start difference. First operand 41581 states and 57417 transitions. Second operand has 3 states, 3 states have (on average 33.333333333333336) internal successors, (100), 3 states have internal predecessors, (100), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 16:55:27,175 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:55:27,175 INFO L93 Difference]: Finished difference Result 58771 states and 81381 transitions. [2023-12-02 16:55:27,175 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:55:27,175 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 33.333333333333336) internal successors, (100), 3 states have internal predecessors, (100), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 143 [2023-12-02 16:55:27,176 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:55:27,248 INFO L225 Difference]: With dead ends: 58771 [2023-12-02 16:55:27,248 INFO L226 Difference]: Without dead ends: 40893 [2023-12-02 16:55:27,368 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 145 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 16:55:27,368 INFO L413 NwaCegarLoop]: 234 mSDtfsCounter, 34 mSDsluCounter, 213 mSDsCounter, 0 mSdLazyCounter, 90 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 447 SdHoareTripleChecker+Invalid, 90 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 90 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:55:27,369 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 447 Invalid, 90 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 90 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:55:27,388 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40893 states. [2023-12-02 16:55:31,084 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40893 to 40893. [2023-12-02 16:55:31,105 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40893 states, 35939 states have (on average 1.3851804446423106) internal successors, (49782), 36050 states have internal predecessors, (49782), 2856 states have call successors, (2856), 2079 states have call predecessors, (2856), 2096 states have return successors, (3899), 2765 states have call predecessors, (3899), 2853 states have call successors, (3899) [2023-12-02 16:55:31,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40893 states to 40893 states and 56537 transitions. [2023-12-02 16:55:31,190 INFO L78 Accepts]: Start accepts. Automaton has 40893 states and 56537 transitions. Word has length 143 [2023-12-02 16:55:31,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:55:31,191 INFO L495 AbstractCegarLoop]: Abstraction has 40893 states and 56537 transitions. [2023-12-02 16:55:31,191 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 33.333333333333336) internal successors, (100), 3 states have internal predecessors, (100), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 16:55:31,191 INFO L276 IsEmpty]: Start isEmpty. Operand 40893 states and 56537 transitions. [2023-12-02 16:55:31,222 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2023-12-02 16:55:31,222 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:55:31,222 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, 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 16:55:31,228 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2023-12-02 16:55:31,422 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2023-12-02 16:55:31,423 INFO L420 AbstractCegarLoop]: === Iteration 38 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:55:31,423 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:55:31,423 INFO L85 PathProgramCache]: Analyzing trace with hash 1942340477, now seen corresponding path program 1 times [2023-12-02 16:55:31,423 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:55:31,423 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1421070660] [2023-12-02 16:55:31,423 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:55:31,423 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:55:31,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:55:31,587 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 17 proven. 37 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2023-12-02 16:55:31,587 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:55:31,587 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1421070660] [2023-12-02 16:55:31,587 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1421070660] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:55:31,587 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [351791540] [2023-12-02 16:55:31,587 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:55:31,587 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:55:31,588 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:55:31,588 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:55:31,589 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2023-12-02 16:55:31,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:55:31,730 INFO L262 TraceCheckSpWp]: Trace formula consists of 753 conjuncts, 9 conjunts are in the unsatisfiable core [2023-12-02 16:55:31,733 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:55:31,807 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 60 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-12-02 16:55:31,808 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:55:31,808 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [351791540] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:55:31,808 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:55:31,808 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 10 [2023-12-02 16:55:31,808 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [763459270] [2023-12-02 16:55:31,808 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:55:31,809 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 16:55:31,809 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:55:31,809 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 16:55:31,809 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2023-12-02 16:55:31,809 INFO L87 Difference]: Start difference. First operand 40893 states and 56537 transitions. Second operand has 6 states, 6 states have (on average 15.666666666666666) internal successors, (94), 6 states have internal predecessors, (94), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 16:55:37,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:55:37,245 INFO L93 Difference]: Finished difference Result 99345 states and 137177 transitions. [2023-12-02 16:55:37,246 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-12-02 16:55:37,246 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 15.666666666666666) internal successors, (94), 6 states have internal predecessors, (94), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 144 [2023-12-02 16:55:37,246 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:55:37,354 INFO L225 Difference]: With dead ends: 99345 [2023-12-02 16:55:37,354 INFO L226 Difference]: Without dead ends: 59236 [2023-12-02 16:55:37,395 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 143 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=51, Invalid=159, Unknown=0, NotChecked=0, Total=210 [2023-12-02 16:55:37,395 INFO L413 NwaCegarLoop]: 184 mSDtfsCounter, 519 mSDsluCounter, 331 mSDsCounter, 0 mSdLazyCounter, 265 mSolverCounterSat, 141 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 543 SdHoareTripleChecker+Valid, 515 SdHoareTripleChecker+Invalid, 406 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 141 IncrementalHoareTripleChecker+Valid, 265 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 16:55:37,395 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [543 Valid, 515 Invalid, 406 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [141 Valid, 265 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 16:55:37,438 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59236 states. [2023-12-02 16:55:42,957 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59236 to 59232. [2023-12-02 16:55:42,992 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59232 states, 51972 states have (on average 1.3597129223428) internal successors, (70667), 52131 states have internal predecessors, (70667), 4179 states have call successors, (4179), 3062 states have call predecessors, (4179), 3079 states have return successors, (5690), 4040 states have call predecessors, (5690), 4176 states have call successors, (5690) [2023-12-02 16:55:43,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59232 states to 59232 states and 80536 transitions. [2023-12-02 16:55:43,128 INFO L78 Accepts]: Start accepts. Automaton has 59232 states and 80536 transitions. Word has length 144 [2023-12-02 16:55:43,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:55:43,128 INFO L495 AbstractCegarLoop]: Abstraction has 59232 states and 80536 transitions. [2023-12-02 16:55:43,128 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 15.666666666666666) internal successors, (94), 6 states have internal predecessors, (94), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 16:55:43,128 INFO L276 IsEmpty]: Start isEmpty. Operand 59232 states and 80536 transitions. [2023-12-02 16:55:43,175 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2023-12-02 16:55:43,175 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:55:43,175 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 16:55:43,180 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Ended with exit code 0 [2023-12-02 16:55:43,375 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:55:43,376 INFO L420 AbstractCegarLoop]: === Iteration 39 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:55:43,376 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:55:43,376 INFO L85 PathProgramCache]: Analyzing trace with hash -1550340030, now seen corresponding path program 1 times [2023-12-02 16:55:43,376 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:55:43,376 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1798440393] [2023-12-02 16:55:43,376 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:55:43,376 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:55:43,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:55:43,538 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 22 proven. 4 refuted. 0 times theorem prover too weak. 65 trivial. 0 not checked. [2023-12-02 16:55:43,538 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:55:43,538 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1798440393] [2023-12-02 16:55:43,538 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1798440393] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:55:43,538 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2038914908] [2023-12-02 16:55:43,539 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:55:43,539 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:55:43,539 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:55:43,540 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:55:43,541 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2023-12-02 16:55:43,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:55:43,672 INFO L262 TraceCheckSpWp]: Trace formula consists of 738 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 16:55:43,675 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:55:43,694 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 71 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-12-02 16:55:43,694 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:55:43,694 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2038914908] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:55:43,695 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:55:43,695 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2023-12-02 16:55:43,695 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1412770657] [2023-12-02 16:55:43,695 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:55:43,695 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:55:43,696 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:55:43,696 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:55:43,696 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-12-02 16:55:43,696 INFO L87 Difference]: Start difference. First operand 59232 states and 80536 transitions. Second operand has 3 states, 3 states have (on average 32.666666666666664) internal successors, (98), 3 states have internal predecessors, (98), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 16:55:50,414 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:55:50,414 INFO L93 Difference]: Finished difference Result 113826 states and 155997 transitions. [2023-12-02 16:55:50,415 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:55:50,415 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 32.666666666666664) internal successors, (98), 3 states have internal predecessors, (98), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 140 [2023-12-02 16:55:50,415 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:55:50,546 INFO L225 Difference]: With dead ends: 113826 [2023-12-02 16:55:50,546 INFO L226 Difference]: Without dead ends: 75035 [2023-12-02 16:55:50,583 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 140 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 16:55:50,584 INFO L413 NwaCegarLoop]: 317 mSDtfsCounter, 101 mSDsluCounter, 222 mSDsCounter, 0 mSdLazyCounter, 103 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 101 SdHoareTripleChecker+Valid, 539 SdHoareTripleChecker+Invalid, 103 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 103 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:55:50,584 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [101 Valid, 539 Invalid, 103 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 103 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:55:50,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75035 states. [2023-12-02 16:55:57,708 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75035 to 70842. [2023-12-02 16:55:57,741 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70842 states, 62610 states have (on average 1.3667305542245647) internal successors, (85571), 62769 states have internal predecessors, (85571), 4665 states have call successors, (4665), 3548 states have call predecessors, (4665), 3565 states have return successors, (6176), 4526 states have call predecessors, (6176), 4662 states have call successors, (6176) [2023-12-02 16:55:57,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70842 states to 70842 states and 96412 transitions. [2023-12-02 16:55:57,885 INFO L78 Accepts]: Start accepts. Automaton has 70842 states and 96412 transitions. Word has length 140 [2023-12-02 16:55:57,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:55:57,885 INFO L495 AbstractCegarLoop]: Abstraction has 70842 states and 96412 transitions. [2023-12-02 16:55:57,885 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 32.666666666666664) internal successors, (98), 3 states have internal predecessors, (98), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 16:55:57,885 INFO L276 IsEmpty]: Start isEmpty. Operand 70842 states and 96412 transitions. [2023-12-02 16:55:57,935 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2023-12-02 16:55:57,936 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:55:57,936 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, 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 16:55:57,942 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Ended with exit code 0 [2023-12-02 16:55:58,136 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2023-12-02 16:55:58,137 INFO L420 AbstractCegarLoop]: === Iteration 40 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:55:58,137 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:55:58,137 INFO L85 PathProgramCache]: Analyzing trace with hash -1559737691, now seen corresponding path program 1 times [2023-12-02 16:55:58,137 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:55:58,137 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1615321842] [2023-12-02 16:55:58,137 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:55:58,137 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:55:58,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:55:58,260 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 17 proven. 37 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2023-12-02 16:55:58,261 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:55:58,261 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1615321842] [2023-12-02 16:55:58,261 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1615321842] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:55:58,261 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [143669864] [2023-12-02 16:55:58,261 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:55:58,261 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:55:58,261 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:55:58,262 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:55:58,263 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2023-12-02 16:55:58,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:55:58,416 INFO L262 TraceCheckSpWp]: Trace formula consists of 753 conjuncts, 9 conjunts are in the unsatisfiable core [2023-12-02 16:55:58,419 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:55:58,489 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 65 proven. 0 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2023-12-02 16:55:58,489 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:55:58,489 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [143669864] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:55:58,489 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:55:58,489 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 10 [2023-12-02 16:55:58,489 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [282746615] [2023-12-02 16:55:58,489 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:55:58,490 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 16:55:58,490 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:55:58,490 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 16:55:58,490 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2023-12-02 16:55:58,491 INFO L87 Difference]: Start difference. First operand 70842 states and 96412 transitions. Second operand has 6 states, 5 states have (on average 19.6) internal successors, (98), 6 states have internal predecessors, (98), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 16:56:08,168 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:56:08,168 INFO L93 Difference]: Finished difference Result 165738 states and 225978 transitions. [2023-12-02 16:56:08,168 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-12-02 16:56:08,168 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 19.6) internal successors, (98), 6 states have internal predecessors, (98), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 144 [2023-12-02 16:56:08,168 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:56:08,325 INFO L225 Difference]: With dead ends: 165738 [2023-12-02 16:56:08,325 INFO L226 Difference]: Without dead ends: 95680 [2023-12-02 16:56:08,376 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 143 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=51, Invalid=159, Unknown=0, NotChecked=0, Total=210 [2023-12-02 16:56:08,377 INFO L413 NwaCegarLoop]: 182 mSDtfsCounter, 517 mSDsluCounter, 326 mSDsCounter, 0 mSdLazyCounter, 263 mSolverCounterSat, 143 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 541 SdHoareTripleChecker+Valid, 508 SdHoareTripleChecker+Invalid, 406 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 143 IncrementalHoareTripleChecker+Valid, 263 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 16:56:08,377 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [541 Valid, 508 Invalid, 406 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [143 Valid, 263 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 16:56:08,438 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95680 states. [2023-12-02 16:56:17,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95680 to 95676. [2023-12-02 16:56:17,302 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95676 states, 84172 states have (on average 1.3526232001140521) internal successors, (113853), 84403 states have internal predecessors, (113853), 6547 states have call successors, (6547), 4938 states have call predecessors, (6547), 4955 states have return successors, (8738), 6336 states have call predecessors, (8738), 6544 states have call successors, (8738) [2023-12-02 16:56:17,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95676 states to 95676 states and 129138 transitions. [2023-12-02 16:56:17,509 INFO L78 Accepts]: Start accepts. Automaton has 95676 states and 129138 transitions. Word has length 144 [2023-12-02 16:56:17,509 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:56:17,509 INFO L495 AbstractCegarLoop]: Abstraction has 95676 states and 129138 transitions. [2023-12-02 16:56:17,509 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 19.6) internal successors, (98), 6 states have internal predecessors, (98), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 16:56:17,509 INFO L276 IsEmpty]: Start isEmpty. Operand 95676 states and 129138 transitions. [2023-12-02 16:56:17,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2023-12-02 16:56:17,573 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:56:17,574 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, 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 16:56:17,579 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2023-12-02 16:56:17,774 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2023-12-02 16:56:17,774 INFO L420 AbstractCegarLoop]: === Iteration 41 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:56:17,775 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:56:17,775 INFO L85 PathProgramCache]: Analyzing trace with hash -2042794489, now seen corresponding path program 1 times [2023-12-02 16:56:17,775 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:56:17,775 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2054790718] [2023-12-02 16:56:17,775 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:56:17,775 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:56:17,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:56:17,903 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 17 proven. 37 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2023-12-02 16:56:17,903 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:56:17,903 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2054790718] [2023-12-02 16:56:17,903 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2054790718] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:56:17,903 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [679519474] [2023-12-02 16:56:17,903 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:56:17,904 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:56:17,904 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:56:17,904 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:56:17,905 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2023-12-02 16:56:18,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:56:18,038 INFO L262 TraceCheckSpWp]: Trace formula consists of 765 conjuncts, 9 conjunts are in the unsatisfiable core [2023-12-02 16:56:18,040 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:56:18,096 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 58 proven. 0 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2023-12-02 16:56:18,097 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:56:18,097 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [679519474] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:56:18,097 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:56:18,097 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 7 [2023-12-02 16:56:18,097 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [956440231] [2023-12-02 16:56:18,097 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:56:18,097 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 16:56:18,098 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:56:18,098 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 16:56:18,098 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2023-12-02 16:56:18,098 INFO L87 Difference]: Start difference. First operand 95676 states and 129138 transitions. Second operand has 6 states, 6 states have (on average 15.666666666666666) internal successors, (94), 6 states have internal predecessors, (94), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 16:56:31,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:56:31,045 INFO L93 Difference]: Finished difference Result 224646 states and 303678 transitions. [2023-12-02 16:56:31,045 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-12-02 16:56:31,045 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 15.666666666666666) internal successors, (94), 6 states have internal predecessors, (94), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 148 [2023-12-02 16:56:31,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:56:31,299 INFO L225 Difference]: With dead ends: 224646 [2023-12-02 16:56:31,299 INFO L226 Difference]: Without dead ends: 129754 [2023-12-02 16:56:31,383 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 150 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2023-12-02 16:56:31,384 INFO L413 NwaCegarLoop]: 186 mSDtfsCounter, 523 mSDsluCounter, 341 mSDsCounter, 0 mSdLazyCounter, 269 mSolverCounterSat, 135 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 547 SdHoareTripleChecker+Valid, 527 SdHoareTripleChecker+Invalid, 404 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 135 IncrementalHoareTripleChecker+Valid, 269 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 16:56:31,384 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [547 Valid, 527 Invalid, 404 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [135 Valid, 269 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 16:56:31,480 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129754 states. [2023-12-02 16:56:45,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129754 to 129750. [2023-12-02 16:56:45,154 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 129750 states, 113595 states have (on average 1.3385096175007702) internal successors, (152048), 113934 states have internal predecessors, (152048), 9228 states have call successors, (9228), 6908 states have call predecessors, (9228), 6925 states have return successors, (12404), 8909 states have call predecessors, (12404), 9225 states have call successors, (12404) [2023-12-02 16:56:45,439 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129750 states to 129750 states and 173680 transitions. [2023-12-02 16:56:45,444 INFO L78 Accepts]: Start accepts. Automaton has 129750 states and 173680 transitions. Word has length 148 [2023-12-02 16:56:45,444 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:56:45,444 INFO L495 AbstractCegarLoop]: Abstraction has 129750 states and 173680 transitions. [2023-12-02 16:56:45,444 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 15.666666666666666) internal successors, (94), 6 states have internal predecessors, (94), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 16:56:45,444 INFO L276 IsEmpty]: Start isEmpty. Operand 129750 states and 173680 transitions. [2023-12-02 16:56:45,532 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2023-12-02 16:56:45,532 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:56:45,532 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, 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 16:56:45,537 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Ended with exit code 0 [2023-12-02 16:56:45,732 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:56:45,733 INFO L420 AbstractCegarLoop]: === Iteration 42 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:56:45,733 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:56:45,733 INFO L85 PathProgramCache]: Analyzing trace with hash 374591761, now seen corresponding path program 1 times [2023-12-02 16:56:45,733 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:56:45,733 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [353994799] [2023-12-02 16:56:45,733 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:56:45,733 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:56:45,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:56:45,875 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 20 proven. 37 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2023-12-02 16:56:45,875 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:56:45,875 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [353994799] [2023-12-02 16:56:45,875 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [353994799] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:56:45,875 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1379961877] [2023-12-02 16:56:45,875 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:56:45,875 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:56:45,876 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:56:45,876 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:56:45,877 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2023-12-02 16:56:46,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:56:46,015 INFO L262 TraceCheckSpWp]: Trace formula consists of 777 conjuncts, 9 conjunts are in the unsatisfiable core [2023-12-02 16:56:46,018 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:56:46,074 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 61 proven. 0 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2023-12-02 16:56:46,074 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:56:46,074 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1379961877] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:56:46,074 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:56:46,075 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 7 [2023-12-02 16:56:46,075 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1502768006] [2023-12-02 16:56:46,075 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:56:46,075 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 16:56:46,075 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:56:46,076 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 16:56:46,076 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2023-12-02 16:56:46,076 INFO L87 Difference]: Start difference. First operand 129750 states and 173680 transitions. Second operand has 6 states, 6 states have (on average 16.5) internal successors, (99), 6 states have internal predecessors, (99), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 16:57:04,407 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:57:04,407 INFO L93 Difference]: Finished difference Result 304747 states and 407868 transitions. [2023-12-02 16:57:04,407 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-12-02 16:57:04,408 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 16.5) internal successors, (99), 6 states have internal predecessors, (99), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 152 [2023-12-02 16:57:04,408 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:57:04,765 INFO L225 Difference]: With dead ends: 304747 [2023-12-02 16:57:04,766 INFO L226 Difference]: Without dead ends: 175781 [2023-12-02 16:57:05,033 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 154 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2023-12-02 16:57:05,034 INFO L413 NwaCegarLoop]: 177 mSDtfsCounter, 615 mSDsluCounter, 276 mSDsCounter, 0 mSdLazyCounter, 240 mSolverCounterSat, 151 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 639 SdHoareTripleChecker+Valid, 453 SdHoareTripleChecker+Invalid, 391 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 151 IncrementalHoareTripleChecker+Valid, 240 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 16:57:05,034 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [639 Valid, 453 Invalid, 391 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [151 Valid, 240 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 16:57:05,131 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175781 states. [2023-12-02 16:57:22,979 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175781 to 175777. [2023-12-02 16:57:23,061 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 175777 states, 153002 states have (on average 1.3205905805152873) internal successors, (202053), 153503 states have internal predecessors, (202053), 13051 states have call successors, (13051), 9705 states have call predecessors, (13051), 9722 states have return successors, (17648), 12570 states have call predecessors, (17648), 13048 states have call successors, (17648) [2023-12-02 16:57:23,682 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175777 states to 175777 states and 232752 transitions. [2023-12-02 16:57:23,690 INFO L78 Accepts]: Start accepts. Automaton has 175777 states and 232752 transitions. Word has length 152 [2023-12-02 16:57:23,690 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:57:23,690 INFO L495 AbstractCegarLoop]: Abstraction has 175777 states and 232752 transitions. [2023-12-02 16:57:23,690 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 16.5) internal successors, (99), 6 states have internal predecessors, (99), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 16:57:23,691 INFO L276 IsEmpty]: Start isEmpty. Operand 175777 states and 232752 transitions. [2023-12-02 16:57:23,815 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2023-12-02 16:57:23,816 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:57:23,816 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, 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 16:57:23,822 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2023-12-02 16:57:24,016 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:57:24,017 INFO L420 AbstractCegarLoop]: === Iteration 43 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:57:24,017 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:57:24,017 INFO L85 PathProgramCache]: Analyzing trace with hash -1231812601, now seen corresponding path program 1 times [2023-12-02 16:57:24,017 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:57:24,017 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1287382421] [2023-12-02 16:57:24,017 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:57:24,017 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:57:24,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:57:24,288 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 44 proven. 20 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2023-12-02 16:57:24,288 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:57:24,288 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1287382421] [2023-12-02 16:57:24,289 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1287382421] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:57:24,289 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [665108934] [2023-12-02 16:57:24,289 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:57:24,289 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:57:24,289 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:57:24,290 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:57:24,291 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2023-12-02 16:57:24,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:57:24,421 INFO L262 TraceCheckSpWp]: Trace formula consists of 789 conjuncts, 6 conjunts are in the unsatisfiable core [2023-12-02 16:57:24,423 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:57:24,468 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 90 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-12-02 16:57:24,468 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:57:24,468 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [665108934] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:57:24,468 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:57:24,469 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 6 [2023-12-02 16:57:24,469 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [345218856] [2023-12-02 16:57:24,469 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:57:24,469 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:57:24,469 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:57:24,470 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:57:24,470 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 16:57:24,470 INFO L87 Difference]: Start difference. First operand 175777 states and 232752 transitions. Second operand has 3 states, 3 states have (on average 42.0) internal successors, (126), 3 states have internal predecessors, (126), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 16:57:44,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:57:44,058 INFO L93 Difference]: Finished difference Result 317706 states and 426423 transitions. [2023-12-02 16:57:44,058 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:57:44,059 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 42.0) internal successors, (126), 3 states have internal predecessors, (126), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 156 [2023-12-02 16:57:44,059 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:57:44,613 INFO L225 Difference]: With dead ends: 317706 [2023-12-02 16:57:44,613 INFO L226 Difference]: Without dead ends: 194234 [2023-12-02 16:57:44,769 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 158 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 16:57:44,769 INFO L413 NwaCegarLoop]: 235 mSDtfsCounter, 196 mSDsluCounter, 41 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 196 SdHoareTripleChecker+Valid, 276 SdHoareTripleChecker+Invalid, 62 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:57:44,769 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [196 Valid, 276 Invalid, 62 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 58 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:57:44,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194234 states. [2023-12-02 16:58:05,082 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194234 to 193044. [2023-12-02 16:58:05,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 193044 states, 169165 states have (on average 1.3071971152425148) internal successors, (221132), 169666 states have internal predecessors, (221132), 13238 states have call successors, (13238), 10622 states have call predecessors, (13238), 10639 states have return successors, (19574), 12757 states have call predecessors, (19574), 13235 states have call successors, (19574) [2023-12-02 16:58:05,816 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193044 states to 193044 states and 253944 transitions. [2023-12-02 16:58:05,825 INFO L78 Accepts]: Start accepts. Automaton has 193044 states and 253944 transitions. Word has length 156 [2023-12-02 16:58:05,825 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:58:05,825 INFO L495 AbstractCegarLoop]: Abstraction has 193044 states and 253944 transitions. [2023-12-02 16:58:05,825 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 42.0) internal successors, (126), 3 states have internal predecessors, (126), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 16:58:05,826 INFO L276 IsEmpty]: Start isEmpty. Operand 193044 states and 253944 transitions. [2023-12-02 16:58:06,194 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2023-12-02 16:58:06,194 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:58:06,195 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, 3, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:58:06,200 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2023-12-02 16:58:06,395 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable42 [2023-12-02 16:58:06,395 INFO L420 AbstractCegarLoop]: === Iteration 44 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:58:06,396 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:58:06,396 INFO L85 PathProgramCache]: Analyzing trace with hash 1632161493, now seen corresponding path program 1 times [2023-12-02 16:58:06,396 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:58:06,396 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [135289151] [2023-12-02 16:58:06,396 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:58:06,396 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:58:06,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:58:06,540 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 57 proven. 23 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-12-02 16:58:06,540 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:58:06,540 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [135289151] [2023-12-02 16:58:06,540 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [135289151] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:58:06,541 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [618998242] [2023-12-02 16:58:06,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:58:06,541 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:58:06,541 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:58:06,542 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:58:06,542 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2023-12-02 16:58:06,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:58:06,685 INFO L262 TraceCheckSpWp]: Trace formula consists of 787 conjuncts, 22 conjunts are in the unsatisfiable core [2023-12-02 16:58:06,688 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:58:06,744 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 105 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 16:58:06,744 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:58:06,745 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [618998242] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:58:06,745 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:58:06,745 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [5] total 6 [2023-12-02 16:58:06,745 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1578170907] [2023-12-02 16:58:06,745 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:58:06,745 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 16:58:06,745 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:58:06,746 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 16:58:06,746 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-12-02 16:58:06,746 INFO L87 Difference]: Start difference. First operand 193044 states and 253944 transitions. Second operand has 6 states, 6 states have (on average 22.5) internal successors, (135), 6 states have internal predecessors, (135), 5 states have call successors, (12), 5 states have call predecessors, (12), 5 states have return successors, (11), 5 states have call predecessors, (11), 5 states have call successors, (11) [2023-12-02 16:58:32,111 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:58:32,111 INFO L93 Difference]: Finished difference Result 380203 states and 503297 transitions. [2023-12-02 16:58:32,112 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-12-02 16:58:32,112 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 22.5) internal successors, (135), 6 states have internal predecessors, (135), 5 states have call successors, (12), 5 states have call predecessors, (12), 5 states have return successors, (11), 5 states have call predecessors, (11), 5 states have call successors, (11) Word has length 158 [2023-12-02 16:58:32,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:58:32,807 INFO L225 Difference]: With dead ends: 380203 [2023-12-02 16:58:32,807 INFO L226 Difference]: Without dead ends: 245205 [2023-12-02 16:58:32,945 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 165 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2023-12-02 16:58:32,945 INFO L413 NwaCegarLoop]: 304 mSDtfsCounter, 303 mSDsluCounter, 600 mSDsCounter, 0 mSdLazyCounter, 514 mSolverCounterSat, 61 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 322 SdHoareTripleChecker+Valid, 904 SdHoareTripleChecker+Invalid, 575 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 61 IncrementalHoareTripleChecker+Valid, 514 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 16:58:32,945 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [322 Valid, 904 Invalid, 575 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [61 Valid, 514 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 16:58:33,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 245205 states. [2023-12-02 16:58:56,963 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 245205 to 223898. [2023-12-02 16:58:57,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 223898 states, 195164 states have (on average 1.2998913734090303) internal successors, (253692), 195584 states have internal predecessors, (253692), 16205 states have call successors, (16205), 12806 states have call predecessors, (16205), 12527 states have return successors, (24821), 15509 states have call predecessors, (24821), 16202 states have call successors, (24821) [2023-12-02 16:58:57,855 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 223898 states to 223898 states and 294718 transitions. [2023-12-02 16:58:57,862 INFO L78 Accepts]: Start accepts. Automaton has 223898 states and 294718 transitions. Word has length 158 [2023-12-02 16:58:57,863 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:58:57,863 INFO L495 AbstractCegarLoop]: Abstraction has 223898 states and 294718 transitions. [2023-12-02 16:58:57,863 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 22.5) internal successors, (135), 6 states have internal predecessors, (135), 5 states have call successors, (12), 5 states have call predecessors, (12), 5 states have return successors, (11), 5 states have call predecessors, (11), 5 states have call successors, (11) [2023-12-02 16:58:57,863 INFO L276 IsEmpty]: Start isEmpty. Operand 223898 states and 294718 transitions. [2023-12-02 16:58:57,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2023-12-02 16:58:57,987 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:58:57,988 INFO L195 NwaCegarLoop]: trace histogram [5, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 16:58:57,993 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Ended with exit code 0 [2023-12-02 16:58:58,188 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable43 [2023-12-02 16:58:58,188 INFO L420 AbstractCegarLoop]: === Iteration 45 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:58:58,188 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:58:58,188 INFO L85 PathProgramCache]: Analyzing trace with hash 470985860, now seen corresponding path program 1 times [2023-12-02 16:58:58,188 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:58:58,189 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1995792762] [2023-12-02 16:58:58,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:58:58,189 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:58:58,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:58:58,336 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 17 proven. 38 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2023-12-02 16:58:58,336 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:58:58,336 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1995792762] [2023-12-02 16:58:58,336 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1995792762] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:58:58,336 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1375469333] [2023-12-02 16:58:58,336 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:58:58,336 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:58:58,336 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:58:58,337 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:58:58,338 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2023-12-02 16:58:58,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:58:58,492 INFO L262 TraceCheckSpWp]: Trace formula consists of 851 conjuncts, 16 conjunts are in the unsatisfiable core [2023-12-02 16:58:58,494 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:58:58,769 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 74 proven. 0 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2023-12-02 16:58:58,769 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:58:58,769 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1375469333] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:58:58,769 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:58:58,769 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [8] total 13 [2023-12-02 16:58:58,769 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [571383593] [2023-12-02 16:58:58,769 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:58:58,770 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-12-02 16:58:58,770 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:58:58,770 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-12-02 16:58:58,770 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2023-12-02 16:58:58,770 INFO L87 Difference]: Start difference. First operand 223898 states and 294718 transitions. Second operand has 7 states, 6 states have (on average 16.166666666666668) internal successors, (97), 6 states have internal predecessors, (97), 3 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) [2023-12-02 16:59:30,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:59:30,438 INFO L93 Difference]: Finished difference Result 490031 states and 653124 transitions. [2023-12-02 16:59:30,438 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-12-02 16:59:30,438 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 16.166666666666668) internal successors, (97), 6 states have internal predecessors, (97), 3 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) Word has length 149 [2023-12-02 16:59:30,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:59:31,254 INFO L225 Difference]: With dead ends: 490031 [2023-12-02 16:59:31,254 INFO L226 Difference]: Without dead ends: 291993 [2023-12-02 16:59:31,449 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 148 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=64, Invalid=208, Unknown=0, NotChecked=0, Total=272 [2023-12-02 16:59:31,450 INFO L413 NwaCegarLoop]: 345 mSDtfsCounter, 276 mSDsluCounter, 1301 mSDsCounter, 0 mSdLazyCounter, 415 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 282 SdHoareTripleChecker+Valid, 1646 SdHoareTripleChecker+Invalid, 427 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 415 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 16:59:31,450 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [282 Valid, 1646 Invalid, 427 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 415 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 16:59:31,667 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 291993 states. [2023-12-02 16:59:58,917 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 291993 to 247205. [2023-12-02 16:59:59,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 247205 states, 216515 states have (on average 1.3015403089855206) internal successors, (281803), 216930 states have internal predecessors, (281803), 17179 states have call successors, (17179), 13788 states have call predecessors, (17179), 13509 states have return successors, (25765), 16488 states have call predecessors, (25765), 17176 states have call successors, (25765) [2023-12-02 16:59:59,878 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 247205 states to 247205 states and 324747 transitions. [2023-12-02 16:59:59,885 INFO L78 Accepts]: Start accepts. Automaton has 247205 states and 324747 transitions. Word has length 149 [2023-12-02 16:59:59,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:59:59,885 INFO L495 AbstractCegarLoop]: Abstraction has 247205 states and 324747 transitions. [2023-12-02 16:59:59,885 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 16.166666666666668) internal successors, (97), 6 states have internal predecessors, (97), 3 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) [2023-12-02 16:59:59,885 INFO L276 IsEmpty]: Start isEmpty. Operand 247205 states and 324747 transitions. [2023-12-02 17:00:00,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2023-12-02 17:00:00,295 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:00:00,295 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, 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] [2023-12-02 17:00:00,300 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Ended with exit code 0 [2023-12-02 17:00:00,496 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable44 [2023-12-02 17:00:00,496 INFO L420 AbstractCegarLoop]: === Iteration 46 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:00:00,496 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:00:00,496 INFO L85 PathProgramCache]: Analyzing trace with hash 725441249, now seen corresponding path program 1 times [2023-12-02 17:00:00,496 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:00:00,496 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [236258879] [2023-12-02 17:00:00,496 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:00:00,496 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:00:00,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:00:00,614 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 31 proven. 0 refuted. 0 times theorem prover too weak. 67 trivial. 0 not checked. [2023-12-02 17:00:00,615 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:00:00,615 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [236258879] [2023-12-02 17:00:00,615 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [236258879] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 17:00:00,615 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 17:00:00,615 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-12-02 17:00:00,615 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [985665746] [2023-12-02 17:00:00,615 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 17:00:00,616 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 17:00:00,616 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:00:00,616 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 17:00:00,616 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 17:00:00,616 INFO L87 Difference]: Start difference. First operand 247205 states and 324747 transitions. Second operand has 4 states, 4 states have (on average 23.25) internal successors, (93), 4 states have internal predecessors, (93), 2 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) [2023-12-02 17:00:31,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:00:31,354 INFO L93 Difference]: Finished difference Result 477689 states and 635543 transitions. [2023-12-02 17:00:31,354 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-12-02 17:00:31,354 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 23.25) internal successors, (93), 4 states have internal predecessors, (93), 2 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) Word has length 156 [2023-12-02 17:00:31,355 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:00:32,188 INFO L225 Difference]: With dead ends: 477689 [2023-12-02 17:00:32,188 INFO L226 Difference]: Without dead ends: 302561 [2023-12-02 17:00:32,369 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-12-02 17:00:32,370 INFO L413 NwaCegarLoop]: 294 mSDtfsCounter, 237 mSDsluCounter, 429 mSDsCounter, 0 mSdLazyCounter, 153 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 237 SdHoareTripleChecker+Valid, 723 SdHoareTripleChecker+Invalid, 156 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 153 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 17:00:32,370 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [237 Valid, 723 Invalid, 156 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 153 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 17:00:32,609 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 302561 states. [2023-12-02 17:01:03,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 302561 to 292911. [2023-12-02 17:01:04,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 292911 states, 255560 states have (on average 1.3015808420723118) internal successors, (332632), 256182 states have internal predecessors, (332632), 21004 states have call successors, (21004), 16677 states have call predecessors, (21004), 16345 states have return successors, (37568), 20053 states have call predecessors, (37568), 21001 states have call successors, (37568) [2023-12-02 17:01:04,924 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 292911 states to 292911 states and 391204 transitions. [2023-12-02 17:01:04,930 INFO L78 Accepts]: Start accepts. Automaton has 292911 states and 391204 transitions. Word has length 156 [2023-12-02 17:01:04,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:01:04,930 INFO L495 AbstractCegarLoop]: Abstraction has 292911 states and 391204 transitions. [2023-12-02 17:01:04,930 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 23.25) internal successors, (93), 4 states have internal predecessors, (93), 2 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) [2023-12-02 17:01:04,930 INFO L276 IsEmpty]: Start isEmpty. Operand 292911 states and 391204 transitions. [2023-12-02 17:01:05,369 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2023-12-02 17:01:05,369 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:01:05,369 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, 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 17:01:05,369 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2023-12-02 17:01:05,369 INFO L420 AbstractCegarLoop]: === Iteration 47 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:01:05,369 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:01:05,369 INFO L85 PathProgramCache]: Analyzing trace with hash 891395427, now seen corresponding path program 1 times [2023-12-02 17:01:05,370 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:01:05,370 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [506162584] [2023-12-02 17:01:05,370 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:01:05,370 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:01:05,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:01:05,417 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 41 proven. 8 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2023-12-02 17:01:05,417 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:01:05,417 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [506162584] [2023-12-02 17:01:05,417 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [506162584] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 17:01:05,417 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1505069099] [2023-12-02 17:01:05,417 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:01:05,417 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:01:05,417 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:01:05,418 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:01:05,419 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2023-12-02 17:01:05,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:01:05,590 INFO L262 TraceCheckSpWp]: Trace formula consists of 790 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 17:01:05,592 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:01:05,618 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 92 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-12-02 17:01:05,618 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 17:01:05,619 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1505069099] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 17:01:05,619 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 17:01:05,619 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 4 [2023-12-02 17:01:05,619 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [325089801] [2023-12-02 17:01:05,619 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 17:01:05,619 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 17:01:05,619 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:01:05,620 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 17:01:05,620 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 17:01:05,620 INFO L87 Difference]: Start difference. First operand 292911 states and 391204 transitions. Second operand has 3 states, 3 states have (on average 42.333333333333336) internal successors, (127), 3 states have internal predecessors, (127), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 17:01:37,465 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:01:37,465 INFO L93 Difference]: Finished difference Result 513941 states and 704451 transitions. [2023-12-02 17:01:37,466 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 17:01:37,466 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 42.333333333333336) internal successors, (127), 3 states have internal predecessors, (127), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 156 [2023-12-02 17:01:37,466 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:01:38,279 INFO L225 Difference]: With dead ends: 513941 [2023-12-02 17:01:38,279 INFO L226 Difference]: Without dead ends: 293168 [2023-12-02 17:01:38,539 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 157 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 17:01:38,540 INFO L413 NwaCegarLoop]: 338 mSDtfsCounter, 129 mSDsluCounter, 207 mSDsCounter, 0 mSdLazyCounter, 109 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 129 SdHoareTripleChecker+Valid, 545 SdHoareTripleChecker+Invalid, 111 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 109 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 17:01:38,540 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [129 Valid, 545 Invalid, 111 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 109 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 17:01:38,762 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 293168 states. [2023-12-02 17:02:10,546 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 293168 to 290676. [2023-12-02 17:02:10,880 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 290676 states, 253329 states have (on average 1.2815587635051653) internal successors, (324656), 253951 states have internal predecessors, (324656), 21002 states have call successors, (21002), 16675 states have call predecessors, (21002), 16343 states have return successors, (37566), 20051 states have call predecessors, (37566), 20999 states have call successors, (37566) [2023-12-02 17:02:11,675 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 290676 states to 290676 states and 383224 transitions. [2023-12-02 17:02:11,687 INFO L78 Accepts]: Start accepts. Automaton has 290676 states and 383224 transitions. Word has length 156 [2023-12-02 17:02:11,687 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:02:11,687 INFO L495 AbstractCegarLoop]: Abstraction has 290676 states and 383224 transitions. [2023-12-02 17:02:11,687 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 42.333333333333336) internal successors, (127), 3 states have internal predecessors, (127), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 17:02:11,687 INFO L276 IsEmpty]: Start isEmpty. Operand 290676 states and 383224 transitions. [2023-12-02 17:02:12,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2023-12-02 17:02:12,174 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:02:12,174 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, 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 17:02:12,179 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Ended with exit code 0 [2023-12-02 17:02:12,374 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:02:12,375 INFO L420 AbstractCegarLoop]: === Iteration 48 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:02:12,375 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:02:12,375 INFO L85 PathProgramCache]: Analyzing trace with hash -219435573, now seen corresponding path program 1 times [2023-12-02 17:02:12,375 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:02:12,375 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [625877129] [2023-12-02 17:02:12,375 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:02:12,375 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:02:12,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:02:12,478 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 50 proven. 20 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2023-12-02 17:02:12,478 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:02:12,479 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [625877129] [2023-12-02 17:02:12,479 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [625877129] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 17:02:12,479 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [772968719] [2023-12-02 17:02:12,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:02:12,479 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:02:12,479 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:02:12,480 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:02:12,481 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2023-12-02 17:02:12,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:02:12,621 INFO L262 TraceCheckSpWp]: Trace formula consists of 789 conjuncts, 6 conjunts are in the unsatisfiable core [2023-12-02 17:02:12,623 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:02:12,664 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 84 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-12-02 17:02:12,664 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 17:02:12,664 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [772968719] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 17:02:12,664 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 17:02:12,664 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 6 [2023-12-02 17:02:12,664 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [156277621] [2023-12-02 17:02:12,665 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 17:02:12,665 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 17:02:12,665 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:02:12,665 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 17:02:12,665 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 17:02:12,665 INFO L87 Difference]: Start difference. First operand 290676 states and 383224 transitions. Second operand has 3 states, 3 states have (on average 40.0) internal successors, (120), 3 states have internal predecessors, (120), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 17:02:46,473 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:02:46,473 INFO L93 Difference]: Finished difference Result 525007 states and 706200 transitions. [2023-12-02 17:02:46,474 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 17:02:46,474 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 40.0) internal successors, (120), 3 states have internal predecessors, (120), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 156 [2023-12-02 17:02:46,474 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:02:47,289 INFO L225 Difference]: With dead ends: 525007 [2023-12-02 17:02:47,290 INFO L226 Difference]: Without dead ends: 319818 [2023-12-02 17:02:47,550 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 158 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 17:02:47,551 INFO L413 NwaCegarLoop]: 236 mSDtfsCounter, 202 mSDsluCounter, 41 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 202 SdHoareTripleChecker+Valid, 277 SdHoareTripleChecker+Invalid, 62 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 17:02:47,551 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [202 Valid, 277 Invalid, 62 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 58 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 17:02:47,808 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 319818 states. [2023-12-02 17:03:21,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 319818 to 315515. [2023-12-02 17:03:21,829 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 315515 states, 276350 states have (on average 1.2673529943911706) internal successors, (350233), 277485 states have internal predecessors, (350233), 21252 states have call successors, (21252), 17681 states have call predecessors, (21252), 17911 states have return successors, (41586), 20350 states have call predecessors, (41586), 21249 states have call successors, (41586) [2023-12-02 17:03:23,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 315515 states to 315515 states and 413071 transitions. [2023-12-02 17:03:23,068 INFO L78 Accepts]: Start accepts. Automaton has 315515 states and 413071 transitions. Word has length 156 [2023-12-02 17:03:23,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:03:23,068 INFO L495 AbstractCegarLoop]: Abstraction has 315515 states and 413071 transitions. [2023-12-02 17:03:23,068 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 40.0) internal successors, (120), 3 states have internal predecessors, (120), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 17:03:23,068 INFO L276 IsEmpty]: Start isEmpty. Operand 315515 states and 413071 transitions. [2023-12-02 17:03:23,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2023-12-02 17:03:23,236 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:03:23,237 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, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:03:23,244 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Ended with exit code 0 [2023-12-02 17:03:23,437 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:03:23,437 INFO L420 AbstractCegarLoop]: === Iteration 49 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:03:23,438 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:03:23,438 INFO L85 PathProgramCache]: Analyzing trace with hash -180966263, now seen corresponding path program 1 times [2023-12-02 17:03:23,438 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:03:23,438 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1119564189] [2023-12-02 17:03:23,438 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:03:23,438 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:03:23,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:03:23,482 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 46 proven. 11 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2023-12-02 17:03:23,482 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:03:23,482 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1119564189] [2023-12-02 17:03:23,482 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1119564189] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 17:03:23,482 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [104867019] [2023-12-02 17:03:23,482 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:03:23,482 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:03:23,482 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:03:23,483 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:03:23,484 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0e79882-9f5e-4478-ab91-3f9fc9b13704/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2023-12-02 17:03:23,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:03:23,623 INFO L262 TraceCheckSpWp]: Trace formula consists of 783 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 17:03:23,625 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:03:23,650 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 93 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-12-02 17:03:23,650 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 17:03:23,650 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [104867019] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 17:03:23,650 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 17:03:23,650 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 4 [2023-12-02 17:03:23,651 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1164966065] [2023-12-02 17:03:23,651 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 17:03:23,651 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 17:03:23,651 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:03:23,651 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 17:03:23,652 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 17:03:23,652 INFO L87 Difference]: Start difference. First operand 315515 states and 413071 transitions. Second operand has 3 states, 3 states have (on average 41.333333333333336) internal successors, (124), 3 states have internal predecessors, (124), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11)