./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/pc_sfifo_2.cil-1+token_ring.15.cil.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_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/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_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/pc_sfifo_2.cil-1+token_ring.15.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/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_8af9e930-3f4c-4289-bae2-25038bb02c18/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 dc8dc9bdb034e5a733c81076f9e42c36caa1eb5cb68a77287d3420bd964c5f5a --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-12-02 13:13:54,324 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-12-02 13:13:54,389 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-12-02 13:13:54,395 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-12-02 13:13:54,395 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-12-02 13:13:54,422 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-12-02 13:13:54,423 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-12-02 13:13:54,423 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-12-02 13:13:54,424 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-12-02 13:13:54,424 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-12-02 13:13:54,425 INFO L153 SettingsManager]: * User list type=DISABLED [2023-12-02 13:13:54,425 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-12-02 13:13:54,426 INFO L153 SettingsManager]: * Explicit value domain=true [2023-12-02 13:13:54,426 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-12-02 13:13:54,427 INFO L153 SettingsManager]: * Octagon Domain=false [2023-12-02 13:13:54,427 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-12-02 13:13:54,428 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-12-02 13:13:54,428 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-12-02 13:13:54,429 INFO L153 SettingsManager]: * Interval Domain=false [2023-12-02 13:13:54,429 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-12-02 13:13:54,430 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-12-02 13:13:54,431 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-12-02 13:13:54,431 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-12-02 13:13:54,432 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-12-02 13:13:54,432 INFO L153 SettingsManager]: * sizeof long=4 [2023-12-02 13:13:54,433 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-12-02 13:13:54,433 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-12-02 13:13:54,433 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-12-02 13:13:54,434 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-12-02 13:13:54,434 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-12-02 13:13:54,435 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-12-02 13:13:54,435 INFO L153 SettingsManager]: * sizeof long double=12 [2023-12-02 13:13:54,435 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-12-02 13:13:54,436 INFO L153 SettingsManager]: * Use constant arrays=true [2023-12-02 13:13:54,436 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-12-02 13:13:54,436 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-12-02 13:13:54,436 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-12-02 13:13:54,436 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 13:13:54,437 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-12-02 13:13:54,437 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-12-02 13:13:54,437 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-12-02 13:13:54,437 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-12-02 13:13:54,438 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-12-02 13:13:54,438 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-12-02 13:13:54,438 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-12-02 13:13:54,438 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-12-02 13:13:54,438 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-12-02 13:13:54,439 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_8af9e930-3f4c-4289-bae2-25038bb02c18/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> dc8dc9bdb034e5a733c81076f9e42c36caa1eb5cb68a77287d3420bd964c5f5a [2023-12-02 13:13:54,664 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-12-02 13:13:54,684 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-12-02 13:13:54,687 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-12-02 13:13:54,688 INFO L270 PluginConnector]: Initializing CDTParser... [2023-12-02 13:13:54,688 INFO L274 PluginConnector]: CDTParser initialized [2023-12-02 13:13:54,690 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/../../sv-benchmarks/c/combinations/pc_sfifo_2.cil-1+token_ring.15.cil.c [2023-12-02 13:13:57,643 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-12-02 13:13:57,882 INFO L384 CDTParser]: Found 1 translation units. [2023-12-02 13:13:57,882 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/sv-benchmarks/c/combinations/pc_sfifo_2.cil-1+token_ring.15.cil.c [2023-12-02 13:13:57,903 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/data/c8d5d7a01/e74653ebe06f48e58dc31bc7ec35922f/FLAGa482ee409 [2023-12-02 13:13:57,918 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/data/c8d5d7a01/e74653ebe06f48e58dc31bc7ec35922f [2023-12-02 13:13:57,920 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-12-02 13:13:57,922 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-12-02 13:13:57,923 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-12-02 13:13:57,923 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-12-02 13:13:57,928 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-12-02 13:13:57,929 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 01:13:57" (1/1) ... [2023-12-02 13:13:57,930 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6f8e3eb9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 01:13:57, skipping insertion in model container [2023-12-02 13:13:57,930 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 01:13:57" (1/1) ... [2023-12-02 13:13:57,997 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-12-02 13:13:58,143 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_8af9e930-3f4c-4289-bae2-25038bb02c18/sv-benchmarks/c/combinations/pc_sfifo_2.cil-1+token_ring.15.cil.c[914,927] [2023-12-02 13:13:58,204 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_8af9e930-3f4c-4289-bae2-25038bb02c18/sv-benchmarks/c/combinations/pc_sfifo_2.cil-1+token_ring.15.cil.c[7115,7128] [2023-12-02 13:13:58,316 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 13:13:58,329 INFO L202 MainTranslator]: Completed pre-run [2023-12-02 13:13:58,342 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_8af9e930-3f4c-4289-bae2-25038bb02c18/sv-benchmarks/c/combinations/pc_sfifo_2.cil-1+token_ring.15.cil.c[914,927] [2023-12-02 13:13:58,360 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_8af9e930-3f4c-4289-bae2-25038bb02c18/sv-benchmarks/c/combinations/pc_sfifo_2.cil-1+token_ring.15.cil.c[7115,7128] [2023-12-02 13:13:58,413 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 13:13:58,438 INFO L206 MainTranslator]: Completed translation [2023-12-02 13:13:58,439 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 01:13:58 WrapperNode [2023-12-02 13:13:58,439 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-12-02 13:13:58,440 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-12-02 13:13:58,440 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-12-02 13:13:58,440 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-12-02 13:13:58,446 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 01:13:58" (1/1) ... [2023-12-02 13:13:58,466 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 01:13:58" (1/1) ... [2023-12-02 13:13:58,541 INFO L138 Inliner]: procedures = 79, calls = 97, calls flagged for inlining = 47, calls inlined = 47, statements flattened = 1134 [2023-12-02 13:13:58,542 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-12-02 13:13:58,542 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-12-02 13:13:58,542 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-12-02 13:13:58,542 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-12-02 13:13:58,550 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 01:13:58" (1/1) ... [2023-12-02 13:13:58,550 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 01:13:58" (1/1) ... [2023-12-02 13:13:58,557 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 01:13:58" (1/1) ... [2023-12-02 13:13:58,557 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 01:13:58" (1/1) ... [2023-12-02 13:13:58,578 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 01:13:58" (1/1) ... [2023-12-02 13:13:58,595 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 01:13:58" (1/1) ... [2023-12-02 13:13:58,600 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 01:13:58" (1/1) ... [2023-12-02 13:13:58,605 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 01:13:58" (1/1) ... [2023-12-02 13:13:58,614 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-12-02 13:13:58,615 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-12-02 13:13:58,615 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-12-02 13:13:58,615 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-12-02 13:13:58,616 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 01:13:58" (1/1) ... [2023-12-02 13:13:58,623 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 13:13:58,636 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 13:13:58,651 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-12-02 13:13:58,659 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-12-02 13:13:58,692 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-12-02 13:13:58,692 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2023-12-02 13:13:58,692 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2023-12-02 13:13:58,693 INFO L130 BoogieDeclarations]: Found specification of procedure is_do_write_p_triggered [2023-12-02 13:13:58,693 INFO L138 BoogieDeclarations]: Found implementation of procedure is_do_write_p_triggered [2023-12-02 13:13:58,693 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread1 [2023-12-02 13:13:58,693 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread1 [2023-12-02 13:13:58,693 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread2 [2023-12-02 13:13:58,694 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread2 [2023-12-02 13:13:58,694 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events1 [2023-12-02 13:13:58,694 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events1 [2023-12-02 13:13:58,694 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events2 [2023-12-02 13:13:58,695 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events2 [2023-12-02 13:13:58,695 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads2 [2023-12-02 13:13:58,695 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads2 [2023-12-02 13:13:58,695 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads1 [2023-12-02 13:13:58,695 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads1 [2023-12-02 13:13:58,696 INFO L130 BoogieDeclarations]: Found specification of procedure is_do_read_c_triggered [2023-12-02 13:13:58,696 INFO L138 BoogieDeclarations]: Found implementation of procedure is_do_read_c_triggered [2023-12-02 13:13:58,696 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels1 [2023-12-02 13:13:58,696 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels1 [2023-12-02 13:13:58,696 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels2 [2023-12-02 13:13:58,697 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels2 [2023-12-02 13:13:58,697 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-12-02 13:13:58,697 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events2 [2023-12-02 13:13:58,697 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events2 [2023-12-02 13:13:58,697 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events1 [2023-12-02 13:13:58,698 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events1 [2023-12-02 13:13:58,698 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-12-02 13:13:58,698 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-12-02 13:13:58,698 INFO L130 BoogieDeclarations]: Found specification of procedure error1 [2023-12-02 13:13:58,698 INFO L138 BoogieDeclarations]: Found implementation of procedure error1 [2023-12-02 13:13:58,698 INFO L130 BoogieDeclarations]: Found specification of procedure error2 [2023-12-02 13:13:58,699 INFO L138 BoogieDeclarations]: Found implementation of procedure error2 [2023-12-02 13:13:58,840 INFO L241 CfgBuilder]: Building ICFG [2023-12-02 13:13:58,842 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-12-02 13:13:59,647 INFO L282 CfgBuilder]: Performing block encoding [2023-12-02 13:14:00,107 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-12-02 13:14:00,107 INFO L309 CfgBuilder]: Removed 20 assume(true) statements. [2023-12-02 13:14:00,109 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 01:14:00 BoogieIcfgContainer [2023-12-02 13:14:00,109 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-12-02 13:14:00,113 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-12-02 13:14:00,113 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-12-02 13:14:00,116 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-12-02 13:14:00,116 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.12 01:13:57" (1/3) ... [2023-12-02 13:14:00,117 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@19a6a10f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 01:14:00, skipping insertion in model container [2023-12-02 13:14:00,117 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 01:13:58" (2/3) ... [2023-12-02 13:14:00,117 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@19a6a10f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 01:14:00, skipping insertion in model container [2023-12-02 13:14:00,118 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 01:14:00" (3/3) ... [2023-12-02 13:14:00,119 INFO L112 eAbstractionObserver]: Analyzing ICFG pc_sfifo_2.cil-1+token_ring.15.cil.c [2023-12-02 13:14:00,139 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-12-02 13:14:00,139 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2023-12-02 13:14:00,196 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-12-02 13:14:00,203 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;@1c9dcfd0, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-12-02 13:14:00,203 INFO L358 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2023-12-02 13:14:00,209 INFO L276 IsEmpty]: Start isEmpty. Operand has 291 states, 230 states have (on average 1.517391304347826) internal successors, (349), 238 states have internal predecessors, (349), 43 states have call successors, (43), 15 states have call predecessors, (43), 15 states have return successors, (43), 41 states have call predecessors, (43), 43 states have call successors, (43) [2023-12-02 13:14:00,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2023-12-02 13:14:00,220 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 13:14:00,221 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 13:14:00,221 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 13:14:00,226 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 13:14:00,227 INFO L85 PathProgramCache]: Analyzing trace with hash 1581838793, now seen corresponding path program 1 times [2023-12-02 13:14:00,236 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 13:14:00,236 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [193452216] [2023-12-02 13:14:00,237 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:14:00,237 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 13:14:00,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:14:00,561 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 13:14:00,561 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 13:14:00,561 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [193452216] [2023-12-02 13:14:00,562 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [193452216] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 13:14:00,562 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 13:14:00,562 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-12-02 13:14:00,564 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1814712498] [2023-12-02 13:14:00,564 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 13:14:00,568 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 13:14:00,569 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 13:14:00,595 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 13:14:00,596 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 13:14:00,599 INFO L87 Difference]: Start difference. First operand has 291 states, 230 states have (on average 1.517391304347826) internal successors, (349), 238 states have internal predecessors, (349), 43 states have call successors, (43), 15 states have call predecessors, (43), 15 states have return successors, (43), 41 states have call predecessors, (43), 43 states have call successors, (43) Second operand has 4 states, 4 states have (on average 7.5) internal successors, (30), 4 states have internal predecessors, (30), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 3 states have call predecessors, (7), 4 states have call successors, (7) [2023-12-02 13:14:01,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 13:14:01,050 INFO L93 Difference]: Finished difference Result 632 states and 941 transitions. [2023-12-02 13:14:01,051 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 13:14:01,053 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 7.5) internal successors, (30), 4 states have internal predecessors, (30), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 3 states have call predecessors, (7), 4 states have call successors, (7) Word has length 45 [2023-12-02 13:14:01,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 13:14:01,091 INFO L225 Difference]: With dead ends: 632 [2023-12-02 13:14:01,091 INFO L226 Difference]: Without dead ends: 345 [2023-12-02 13:14:01,097 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 13:14:01,100 INFO L413 NwaCegarLoop]: 410 mSDtfsCounter, 481 mSDsluCounter, 308 mSDsCounter, 0 mSdLazyCounter, 272 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 481 SdHoareTripleChecker+Valid, 718 SdHoareTripleChecker+Invalid, 291 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 272 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 13:14:01,101 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [481 Valid, 718 Invalid, 291 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 272 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 13:14:01,121 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 345 states. [2023-12-02 13:14:01,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 345 to 338. [2023-12-02 13:14:01,172 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 338 states, 265 states have (on average 1.441509433962264) internal successors, (382), 270 states have internal predecessors, (382), 51 states have call successors, (51), 22 states have call predecessors, (51), 20 states have return successors, (47), 47 states have call predecessors, (47), 47 states have call successors, (47) [2023-12-02 13:14:01,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 338 states to 338 states and 480 transitions. [2023-12-02 13:14:01,178 INFO L78 Accepts]: Start accepts. Automaton has 338 states and 480 transitions. Word has length 45 [2023-12-02 13:14:01,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 13:14:01,179 INFO L495 AbstractCegarLoop]: Abstraction has 338 states and 480 transitions. [2023-12-02 13:14:01,179 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 7.5) internal successors, (30), 4 states have internal predecessors, (30), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 3 states have call predecessors, (7), 4 states have call successors, (7) [2023-12-02 13:14:01,179 INFO L276 IsEmpty]: Start isEmpty. Operand 338 states and 480 transitions. [2023-12-02 13:14:01,182 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2023-12-02 13:14:01,182 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 13:14:01,183 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 13:14:01,183 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-12-02 13:14:01,183 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 13:14:01,184 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 13:14:01,184 INFO L85 PathProgramCache]: Analyzing trace with hash -1794153880, now seen corresponding path program 1 times [2023-12-02 13:14:01,184 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 13:14:01,185 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [843043939] [2023-12-02 13:14:01,185 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:14:01,185 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 13:14:01,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:14:01,315 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 13:14:01,315 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 13:14:01,315 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [843043939] [2023-12-02 13:14:01,316 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [843043939] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 13:14:01,316 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 13:14:01,316 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-12-02 13:14:01,317 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1427265285] [2023-12-02 13:14:01,317 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 13:14:01,318 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 13:14:01,318 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 13:14:01,319 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 13:14:01,319 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 13:14:01,320 INFO L87 Difference]: Start difference. First operand 338 states and 480 transitions. Second operand has 6 states, 6 states have (on average 5.0) internal successors, (30), 6 states have internal predecessors, (30), 4 states have call successors, (8), 2 states have call predecessors, (8), 4 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2023-12-02 13:14:02,174 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 13:14:02,174 INFO L93 Difference]: Finished difference Result 740 states and 983 transitions. [2023-12-02 13:14:02,175 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-12-02 13:14:02,175 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 5.0) internal successors, (30), 6 states have internal predecessors, (30), 4 states have call successors, (8), 2 states have call predecessors, (8), 4 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) Word has length 45 [2023-12-02 13:14:02,176 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 13:14:02,183 INFO L225 Difference]: With dead ends: 740 [2023-12-02 13:14:02,183 INFO L226 Difference]: Without dead ends: 608 [2023-12-02 13:14:02,184 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2023-12-02 13:14:02,186 INFO L413 NwaCegarLoop]: 466 mSDtfsCounter, 980 mSDsluCounter, 734 mSDsCounter, 0 mSdLazyCounter, 628 mSolverCounterSat, 273 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 984 SdHoareTripleChecker+Valid, 1200 SdHoareTripleChecker+Invalid, 901 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 273 IncrementalHoareTripleChecker+Valid, 628 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-12-02 13:14:02,187 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [984 Valid, 1200 Invalid, 901 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [273 Valid, 628 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-12-02 13:14:02,189 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 608 states. [2023-12-02 13:14:02,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 608 to 524. [2023-12-02 13:14:02,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 524 states, 397 states have (on average 1.3652392947103276) internal successors, (542), 403 states have internal predecessors, (542), 78 states have call successors, (78), 45 states have call predecessors, (78), 47 states have return successors, (78), 77 states have call predecessors, (78), 74 states have call successors, (78) [2023-12-02 13:14:02,245 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 524 states to 524 states and 698 transitions. [2023-12-02 13:14:02,246 INFO L78 Accepts]: Start accepts. Automaton has 524 states and 698 transitions. Word has length 45 [2023-12-02 13:14:02,246 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 13:14:02,246 INFO L495 AbstractCegarLoop]: Abstraction has 524 states and 698 transitions. [2023-12-02 13:14:02,247 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 5.0) internal successors, (30), 6 states have internal predecessors, (30), 4 states have call successors, (8), 2 states have call predecessors, (8), 4 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2023-12-02 13:14:02,247 INFO L276 IsEmpty]: Start isEmpty. Operand 524 states and 698 transitions. [2023-12-02 13:14:02,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2023-12-02 13:14:02,249 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 13:14:02,250 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 13:14:02,250 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-12-02 13:14:02,250 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 13:14:02,251 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 13:14:02,251 INFO L85 PathProgramCache]: Analyzing trace with hash 398999748, now seen corresponding path program 1 times [2023-12-02 13:14:02,251 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 13:14:02,252 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1659083506] [2023-12-02 13:14:02,252 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:14:02,252 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 13:14:02,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:14:02,465 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 13:14:02,466 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 13:14:02,466 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1659083506] [2023-12-02 13:14:02,466 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1659083506] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 13:14:02,466 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 13:14:02,467 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2023-12-02 13:14:02,467 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1071248527] [2023-12-02 13:14:02,467 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 13:14:02,468 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-12-02 13:14:02,468 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 13:14:02,469 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-12-02 13:14:02,469 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2023-12-02 13:14:02,469 INFO L87 Difference]: Start difference. First operand 524 states and 698 transitions. Second operand has 8 states, 7 states have (on average 4.428571428571429) internal successors, (31), 7 states have internal predecessors, (31), 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 13:14:03,533 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 13:14:03,533 INFO L93 Difference]: Finished difference Result 1040 states and 1314 transitions. [2023-12-02 13:14:03,533 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-12-02 13:14:03,534 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 4.428571428571429) internal successors, (31), 7 states have internal predecessors, (31), 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 46 [2023-12-02 13:14:03,534 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 13:14:03,540 INFO L225 Difference]: With dead ends: 1040 [2023-12-02 13:14:03,540 INFO L226 Difference]: Without dead ends: 738 [2023-12-02 13:14:03,542 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=90, Invalid=216, Unknown=0, NotChecked=0, Total=306 [2023-12-02 13:14:03,543 INFO L413 NwaCegarLoop]: 236 mSDtfsCounter, 580 mSDsluCounter, 1045 mSDsCounter, 0 mSdLazyCounter, 1145 mSolverCounterSat, 98 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 612 SdHoareTripleChecker+Valid, 1281 SdHoareTripleChecker+Invalid, 1243 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 98 IncrementalHoareTripleChecker+Valid, 1145 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2023-12-02 13:14:03,544 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [612 Valid, 1281 Invalid, 1243 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [98 Valid, 1145 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2023-12-02 13:14:03,546 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 738 states. [2023-12-02 13:14:03,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 738 to 703. [2023-12-02 13:14:03,596 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 703 states, 522 states have (on average 1.3295019157088122) internal successors, (694), 529 states have internal predecessors, (694), 105 states have call successors, (105), 68 states have call predecessors, (105), 74 states have return successors, (109), 107 states have call predecessors, (109), 101 states have call successors, (109) [2023-12-02 13:14:03,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 703 states to 703 states and 908 transitions. [2023-12-02 13:14:03,602 INFO L78 Accepts]: Start accepts. Automaton has 703 states and 908 transitions. Word has length 46 [2023-12-02 13:14:03,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 13:14:03,603 INFO L495 AbstractCegarLoop]: Abstraction has 703 states and 908 transitions. [2023-12-02 13:14:03,603 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 4.428571428571429) internal successors, (31), 7 states have internal predecessors, (31), 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 13:14:03,603 INFO L276 IsEmpty]: Start isEmpty. Operand 703 states and 908 transitions. [2023-12-02 13:14:03,605 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2023-12-02 13:14:03,606 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 13:14:03,606 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 13:14:03,606 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-12-02 13:14:03,607 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 13:14:03,607 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 13:14:03,607 INFO L85 PathProgramCache]: Analyzing trace with hash 166519347, now seen corresponding path program 1 times [2023-12-02 13:14:03,608 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 13:14:03,608 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1006882131] [2023-12-02 13:14:03,608 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:14:03,608 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 13:14:03,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:14:03,680 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 13:14:03,680 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 13:14:03,680 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1006882131] [2023-12-02 13:14:03,681 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1006882131] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 13:14:03,681 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 13:14:03,681 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 13:14:03,681 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1101912933] [2023-12-02 13:14:03,681 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 13:14:03,682 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 13:14:03,682 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 13:14:03,683 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 13:14:03,683 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 13:14:03,683 INFO L87 Difference]: Start difference. First operand 703 states and 908 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 13:14:03,881 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 13:14:03,881 INFO L93 Difference]: Finished difference Result 1267 states and 1578 transitions. [2023-12-02 13:14:03,881 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 13:14:03,882 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 13:14:03,882 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 13:14:03,889 INFO L225 Difference]: With dead ends: 1267 [2023-12-02 13:14:03,889 INFO L226 Difference]: Without dead ends: 835 [2023-12-02 13:14:03,890 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 13:14:03,894 INFO L413 NwaCegarLoop]: 359 mSDtfsCounter, 67 mSDsluCounter, 328 mSDsCounter, 0 mSdLazyCounter, 134 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 687 SdHoareTripleChecker+Invalid, 137 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 134 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 13:14:03,895 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [67 Valid, 687 Invalid, 137 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 134 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 13:14:03,897 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 835 states. [2023-12-02 13:14:03,967 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 835 to 730. [2023-12-02 13:14:03,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 730 states, 545 states have (on average 1.3192660550458715) internal successors, (719), 552 states have internal predecessors, (719), 107 states have call successors, (107), 70 states have call predecessors, (107), 76 states have return successors, (111), 109 states have call predecessors, (111), 103 states have call successors, (111) [2023-12-02 13:14:03,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 730 states to 730 states and 937 transitions. [2023-12-02 13:14:03,977 INFO L78 Accepts]: Start accepts. Automaton has 730 states and 937 transitions. Word has length 47 [2023-12-02 13:14:03,980 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 13:14:03,980 INFO L495 AbstractCegarLoop]: Abstraction has 730 states and 937 transitions. [2023-12-02 13:14:03,981 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 13:14:03,981 INFO L276 IsEmpty]: Start isEmpty. Operand 730 states and 937 transitions. [2023-12-02 13:14:03,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2023-12-02 13:14:03,992 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 13:14:03,992 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] [2023-12-02 13:14:03,993 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-12-02 13:14:03,994 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 13:14:03,994 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 13:14:03,995 INFO L85 PathProgramCache]: Analyzing trace with hash 1216400715, now seen corresponding path program 1 times [2023-12-02 13:14:03,995 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 13:14:03,995 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1871190098] [2023-12-02 13:14:03,995 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:14:03,995 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 13:14:04,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:14:04,050 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-12-02 13:14:04,050 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 13:14:04,050 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1871190098] [2023-12-02 13:14:04,050 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1871190098] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 13:14:04,051 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 13:14:04,051 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 13:14:04,051 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [182519868] [2023-12-02 13:14:04,051 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 13:14:04,052 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 13:14:04,052 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 13:14:04,052 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 13:14:04,052 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 13:14:04,053 INFO L87 Difference]: Start difference. First operand 730 states and 937 transitions. Second operand has 3 states, 3 states have (on average 12.333333333333334) internal successors, (37), 3 states have internal predecessors, (37), 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 13:14:04,219 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 13:14:04,219 INFO L93 Difference]: Finished difference Result 920 states and 1158 transitions. [2023-12-02 13:14:04,220 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 13:14:04,221 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 12.333333333333334) internal successors, (37), 3 states have internal predecessors, (37), 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 13:14:04,221 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 13:14:04,226 INFO L225 Difference]: With dead ends: 920 [2023-12-02 13:14:04,226 INFO L226 Difference]: Without dead ends: 647 [2023-12-02 13:14:04,227 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 13:14:04,228 INFO L413 NwaCegarLoop]: 361 mSDtfsCounter, 386 mSDsluCounter, 61 mSDsCounter, 0 mSdLazyCounter, 81 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 386 SdHoareTripleChecker+Valid, 422 SdHoareTripleChecker+Invalid, 83 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 81 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 13:14:04,228 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [386 Valid, 422 Invalid, 83 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 81 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 13:14:04,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 647 states. [2023-12-02 13:14:04,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 647 to 538. [2023-12-02 13:14:04,274 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 538 states, 405 states have (on average 1.325925925925926) internal successors, (537), 410 states have internal predecessors, (537), 83 states have call successors, (83), 50 states have call predecessors, (83), 48 states have return successors, (79), 79 states have call predecessors, (79), 79 states have call successors, (79) [2023-12-02 13:14:04,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 538 states to 538 states and 699 transitions. [2023-12-02 13:14:04,279 INFO L78 Accepts]: Start accepts. Automaton has 538 states and 699 transitions. Word has length 53 [2023-12-02 13:14:04,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 13:14:04,290 INFO L495 AbstractCegarLoop]: Abstraction has 538 states and 699 transitions. [2023-12-02 13:14:04,290 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 12.333333333333334) internal successors, (37), 3 states have internal predecessors, (37), 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 13:14:04,291 INFO L276 IsEmpty]: Start isEmpty. Operand 538 states and 699 transitions. [2023-12-02 13:14:04,292 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2023-12-02 13:14:04,292 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 13:14:04,292 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 13:14:04,292 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-12-02 13:14:04,293 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 13:14:04,293 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 13:14:04,293 INFO L85 PathProgramCache]: Analyzing trace with hash -1401872798, now seen corresponding path program 1 times [2023-12-02 13:14:04,294 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 13:14:04,294 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2079827235] [2023-12-02 13:14:04,294 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:14:04,294 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 13:14:04,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:14:04,383 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 13:14:04,383 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 13:14:04,384 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2079827235] [2023-12-02 13:14:04,384 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2079827235] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 13:14:04,384 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 13:14:04,384 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-12-02 13:14:04,384 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [703608526] [2023-12-02 13:14:04,384 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 13:14:04,385 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 13:14:04,385 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 13:14:04,386 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 13:14:04,386 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 13:14:04,386 INFO L87 Difference]: Start difference. First operand 538 states and 699 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 13:14:04,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 13:14:04,729 INFO L93 Difference]: Finished difference Result 641 states and 815 transitions. [2023-12-02 13:14:04,729 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 13:14:04,730 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 13:14:04,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 13:14:04,734 INFO L225 Difference]: With dead ends: 641 [2023-12-02 13:14:04,734 INFO L226 Difference]: Without dead ends: 638 [2023-12-02 13:14:04,735 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 13:14:04,736 INFO L413 NwaCegarLoop]: 353 mSDtfsCounter, 701 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 95 mSolverCounterSat, 164 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 701 SdHoareTripleChecker+Valid, 393 SdHoareTripleChecker+Invalid, 259 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 164 IncrementalHoareTripleChecker+Valid, 95 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 13:14:04,736 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [701 Valid, 393 Invalid, 259 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [164 Valid, 95 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 13:14:04,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 638 states. [2023-12-02 13:14:04,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 638 to 537. [2023-12-02 13:14:04,784 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 537 states, 405 states have (on average 1.3185185185185184) internal successors, (534), 409 states have internal predecessors, (534), 82 states have call successors, (82), 50 states have call predecessors, (82), 48 states have return successors, (79), 79 states have call predecessors, (79), 79 states have call successors, (79) [2023-12-02 13:14:04,788 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 537 states to 537 states and 695 transitions. [2023-12-02 13:14:04,788 INFO L78 Accepts]: Start accepts. Automaton has 537 states and 695 transitions. Word has length 54 [2023-12-02 13:14:04,789 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 13:14:04,789 INFO L495 AbstractCegarLoop]: Abstraction has 537 states and 695 transitions. [2023-12-02 13:14:04,789 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 13:14:04,789 INFO L276 IsEmpty]: Start isEmpty. Operand 537 states and 695 transitions. [2023-12-02 13:14:04,790 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2023-12-02 13:14:04,791 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 13:14:04,791 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 13:14:04,791 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-12-02 13:14:04,791 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 13:14:04,792 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 13:14:04,792 INFO L85 PathProgramCache]: Analyzing trace with hash -509920612, now seen corresponding path program 1 times [2023-12-02 13:14:04,792 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 13:14:04,792 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [755207790] [2023-12-02 13:14:04,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:14:04,793 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 13:14:04,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:14:04,923 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 13:14:04,923 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 13:14:04,923 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [755207790] [2023-12-02 13:14:04,923 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [755207790] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 13:14:04,924 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [345299733] [2023-12-02 13:14:04,924 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:14:04,924 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:14:04,924 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 13:14:04,928 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 13:14:04,931 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-12-02 13:14:05,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:14:05,073 INFO L262 TraceCheckSpWp]: Trace formula consists of 383 conjuncts, 9 conjunts are in the unsatisfiable core [2023-12-02 13:14:05,079 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 13:14:05,298 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 13:14:05,298 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 13:14:05,390 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 13:14:05,390 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [345299733] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 13:14:05,391 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1516175384] [2023-12-02 13:14:05,412 INFO L159 IcfgInterpreter]: Started Sifa with 54 locations of interest [2023-12-02 13:14:05,413 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 13:14:05,416 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 13:14:05,420 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 13:14:05,420 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 13:14:13,629 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events1 with input of size 221 for LOIs [2023-12-02 13:14:13,761 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread1 with input of size 217 for LOIs [2023-12-02 13:14:13,908 INFO L197 IcfgInterpreter]: Interpreting procedure activate_threads1 with input of size 225 for LOIs [2023-12-02 13:14:15,703 INFO L197 IcfgInterpreter]: Interpreting procedure is_do_write_p_triggered with input of size 221 for LOIs [2023-12-02 13:14:16,131 INFO L197 IcfgInterpreter]: Interpreting procedure is_do_read_c_triggered with input of size 221 for LOIs [2023-12-02 13:14:16,487 INFO L197 IcfgInterpreter]: Interpreting procedure fire_delta_events1 with input of size 221 for LOIs [2023-12-02 13:14:16,599 INFO L197 IcfgInterpreter]: Interpreting procedure update_channels1 with input of size 228 for LOIs [2023-12-02 13:14:16,721 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 13:14:45,105 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [1516175384] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 13:14:45,105 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2023-12-02 13:14:45,105 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [5, 5, 4] total 41 [2023-12-02 13:14:45,106 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1514552628] [2023-12-02 13:14:45,106 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 13:14:45,106 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2023-12-02 13:14:45,106 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 13:14:45,107 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2023-12-02 13:14:45,108 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=1447, Unknown=0, NotChecked=0, Total=1640 [2023-12-02 13:14:45,108 INFO L87 Difference]: Start difference. First operand 537 states and 695 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 13:15:22,474 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 13:15:22,474 INFO L93 Difference]: Finished difference Result 901 states and 1106 transitions. [2023-12-02 13:15:22,475 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2023-12-02 13:15:22,475 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 13:15:22,475 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 13:15:22,479 INFO L225 Difference]: With dead ends: 901 [2023-12-02 13:15:22,479 INFO L226 Difference]: Without dead ends: 586 [2023-12-02 13:15:22,482 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 126 SyntacticMatches, 3 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1430 ImplicationChecksByTransitivity, 54.0s TimeCoverageRelationStatistics Valid=601, Invalid=4091, Unknown=0, NotChecked=0, Total=4692 [2023-12-02 13:15:22,483 INFO L413 NwaCegarLoop]: 324 mSDtfsCounter, 201 mSDsluCounter, 2269 mSDsCounter, 0 mSdLazyCounter, 5464 mSolverCounterSat, 174 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 203 SdHoareTripleChecker+Valid, 2593 SdHoareTripleChecker+Invalid, 5638 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 174 IncrementalHoareTripleChecker+Valid, 5464 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 11.5s IncrementalHoareTripleChecker+Time [2023-12-02 13:15:22,483 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [203 Valid, 2593 Invalid, 5638 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [174 Valid, 5464 Invalid, 0 Unknown, 0 Unchecked, 11.5s Time] [2023-12-02 13:15:22,485 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 586 states. [2023-12-02 13:15:22,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 586 to 571. [2023-12-02 13:15:22,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 571 states, 431 states have (on average 1.3039443155452437) internal successors, (562), 435 states have internal predecessors, (562), 84 states have call successors, (84), 56 states have call predecessors, (84), 54 states have return successors, (81), 81 states have call predecessors, (81), 81 states have call successors, (81) [2023-12-02 13:15:22,598 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 571 states to 571 states and 727 transitions. [2023-12-02 13:15:22,598 INFO L78 Accepts]: Start accepts. Automaton has 571 states and 727 transitions. Word has length 55 [2023-12-02 13:15:22,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 13:15:22,598 INFO L495 AbstractCegarLoop]: Abstraction has 571 states and 727 transitions. [2023-12-02 13:15:22,599 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 13:15:22,599 INFO L276 IsEmpty]: Start isEmpty. Operand 571 states and 727 transitions. [2023-12-02 13:15:22,600 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2023-12-02 13:15:22,600 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 13:15:22,601 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 13:15:22,607 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-12-02 13:15:22,801 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-12-02 13:15:22,801 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 13:15:22,802 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 13:15:22,802 INFO L85 PathProgramCache]: Analyzing trace with hash -1433372077, now seen corresponding path program 1 times [2023-12-02 13:15:22,802 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 13:15:22,802 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1941488744] [2023-12-02 13:15:22,802 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:15:22,802 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 13:15:22,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:15:22,859 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 13:15:22,859 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 13:15:22,859 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1941488744] [2023-12-02 13:15:22,860 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1941488744] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 13:15:22,860 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 13:15:22,860 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 13:15:22,860 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1067681309] [2023-12-02 13:15:22,860 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 13:15:22,861 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 13:15:22,861 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 13:15:22,861 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 13:15:22,862 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 13:15:22,862 INFO L87 Difference]: Start difference. First operand 571 states and 727 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 13:15:23,055 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 13:15:23,055 INFO L93 Difference]: Finished difference Result 852 states and 1049 transitions. [2023-12-02 13:15:23,056 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 13:15:23,056 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 13:15:23,056 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 13:15:23,060 INFO L225 Difference]: With dead ends: 852 [2023-12-02 13:15:23,060 INFO L226 Difference]: Without dead ends: 683 [2023-12-02 13:15:23,061 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 13:15:23,062 INFO L413 NwaCegarLoop]: 388 mSDtfsCounter, 42 mSDsluCounter, 345 mSDsCounter, 0 mSdLazyCounter, 140 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 733 SdHoareTripleChecker+Invalid, 140 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 140 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 13:15:23,062 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [42 Valid, 733 Invalid, 140 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 140 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 13:15:23,064 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 683 states. [2023-12-02 13:15:23,137 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 683 to 606. [2023-12-02 13:15:23,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 606 states, 460 states have (on average 1.3) internal successors, (598), 464 states have internal predecessors, (598), 87 states have call successors, (87), 59 states have call predecessors, (87), 57 states have return successors, (84), 84 states have call predecessors, (84), 84 states have call successors, (84) [2023-12-02 13:15:23,141 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 606 states to 606 states and 769 transitions. [2023-12-02 13:15:23,141 INFO L78 Accepts]: Start accepts. Automaton has 606 states and 769 transitions. Word has length 61 [2023-12-02 13:15:23,141 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 13:15:23,141 INFO L495 AbstractCegarLoop]: Abstraction has 606 states and 769 transitions. [2023-12-02 13:15:23,141 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 13:15:23,141 INFO L276 IsEmpty]: Start isEmpty. Operand 606 states and 769 transitions. [2023-12-02 13:15:23,142 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2023-12-02 13:15:23,142 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 13:15:23,142 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 13:15:23,142 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2023-12-02 13:15:23,143 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 13:15:23,143 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 13:15:23,143 INFO L85 PathProgramCache]: Analyzing trace with hash 2085597665, now seen corresponding path program 1 times [2023-12-02 13:15:23,143 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 13:15:23,143 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1413541858] [2023-12-02 13:15:23,143 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:15:23,143 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 13:15:23,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:15:23,278 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 13:15:23,279 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 13:15:23,279 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1413541858] [2023-12-02 13:15:23,279 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1413541858] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 13:15:23,279 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 13:15:23,279 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2023-12-02 13:15:23,279 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [768081495] [2023-12-02 13:15:23,279 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 13:15:23,280 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-12-02 13:15:23,280 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 13:15:23,280 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-12-02 13:15:23,280 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2023-12-02 13:15:23,281 INFO L87 Difference]: Start difference. First operand 606 states and 769 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 13:15:24,094 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 13:15:24,094 INFO L93 Difference]: Finished difference Result 1069 states and 1295 transitions. [2023-12-02 13:15:24,095 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-12-02 13:15:24,095 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 13:15:24,095 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 13:15:24,099 INFO L225 Difference]: With dead ends: 1069 [2023-12-02 13:15:24,099 INFO L226 Difference]: Without dead ends: 766 [2023-12-02 13:15:24,101 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=90, Invalid=216, Unknown=0, NotChecked=0, Total=306 [2023-12-02 13:15:24,101 INFO L413 NwaCegarLoop]: 223 mSDtfsCounter, 564 mSDsluCounter, 834 mSDsCounter, 0 mSdLazyCounter, 1026 mSolverCounterSat, 105 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 595 SdHoareTripleChecker+Valid, 1057 SdHoareTripleChecker+Invalid, 1131 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 105 IncrementalHoareTripleChecker+Valid, 1026 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-12-02 13:15:24,102 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [595 Valid, 1057 Invalid, 1131 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [105 Valid, 1026 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-12-02 13:15:24,103 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 766 states. [2023-12-02 13:15:24,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 766 to 745. [2023-12-02 13:15:24,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 745 states, 554 states have (on average 1.2653429602888087) internal successors, (701), 558 states have internal predecessors, (701), 111 states have call successors, (111), 80 states have call predecessors, (111), 78 states have return successors, (108), 108 states have call predecessors, (108), 108 states have call successors, (108) [2023-12-02 13:15:24,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 745 states to 745 states and 920 transitions. [2023-12-02 13:15:24,240 INFO L78 Accepts]: Start accepts. Automaton has 745 states and 920 transitions. Word has length 63 [2023-12-02 13:15:24,240 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 13:15:24,240 INFO L495 AbstractCegarLoop]: Abstraction has 745 states and 920 transitions. [2023-12-02 13:15:24,241 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 13:15:24,241 INFO L276 IsEmpty]: Start isEmpty. Operand 745 states and 920 transitions. [2023-12-02 13:15:24,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2023-12-02 13:15:24,242 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 13:15:24,242 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 13:15:24,242 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-12-02 13:15:24,243 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 13:15:24,243 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 13:15:24,243 INFO L85 PathProgramCache]: Analyzing trace with hash 458355823, now seen corresponding path program 1 times [2023-12-02 13:15:24,243 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 13:15:24,243 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [260984009] [2023-12-02 13:15:24,244 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:15:24,244 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 13:15:24,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:15:24,366 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 13:15:24,366 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 13:15:24,367 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [260984009] [2023-12-02 13:15:24,367 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [260984009] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 13:15:24,367 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [214588635] [2023-12-02 13:15:24,367 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:15:24,367 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:15:24,367 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 13:15:24,368 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 13:15:24,371 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-12-02 13:15:24,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:15:24,502 INFO L262 TraceCheckSpWp]: Trace formula consists of 404 conjuncts, 9 conjunts are in the unsatisfiable core [2023-12-02 13:15:24,506 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 13:15:24,681 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 13:15:24,681 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 13:15:24,753 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 13:15:24,753 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [214588635] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 13:15:24,753 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [95415722] [2023-12-02 13:15:24,757 INFO L159 IcfgInterpreter]: Started Sifa with 54 locations of interest [2023-12-02 13:15:24,757 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 13:15:24,757 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 13:15:24,758 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 13:15:24,758 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 13:15:48,899 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events1 with input of size 221 for LOIs [2023-12-02 13:15:49,010 INFO L197 IcfgInterpreter]: Interpreting procedure error1 with input of size 220 for LOIs [2023-12-02 13:15:49,785 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread1 with input of size 188 for LOIs [2023-12-02 13:15:50,588 INFO L197 IcfgInterpreter]: Interpreting procedure activate_threads1 with input of size 225 for LOIs [2023-12-02 13:15:52,319 INFO L197 IcfgInterpreter]: Interpreting procedure is_do_write_p_triggered with input of size 221 for LOIs [2023-12-02 13:15:52,670 INFO L197 IcfgInterpreter]: Interpreting procedure is_do_read_c_triggered with input of size 221 for LOIs [2023-12-02 13:15:53,029 INFO L197 IcfgInterpreter]: Interpreting procedure fire_delta_events1 with input of size 221 for LOIs [2023-12-02 13:15:53,142 INFO L197 IcfgInterpreter]: Interpreting procedure update_channels1 with input of size 228 for LOIs [2023-12-02 13:15:53,260 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 13:16:30,449 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '18746#(and (= ~q_req_up~0 1) (exists ((|v_ULTIMATE.start_eval1_~tmp___0~2#1_BEFORE_CALL_5| Int)) (and (not (= |v_ULTIMATE.start_eval1_~tmp___0~2#1_BEFORE_CALL_5| 0)) (<= 0 (+ |v_ULTIMATE.start_eval1_~tmp___0~2#1_BEFORE_CALL_5| 2147483648)) (<= |v_ULTIMATE.start_eval1_~tmp___0~2#1_BEFORE_CALL_5| 2147483647))) (= ~q_free~0 1) (exists ((|v_ULTIMATE.start_start_simulation1_~kernel_st~0#1_BEFORE_CALL_30| Int) (v_~c_last_read~0_10 Int) (|v_ULTIMATE.start_eval1_~tmp___1~0#1_BEFORE_CALL_1| Int) (v_~q_free~0_42 Int)) (and (= ~E_12~0 2) (= ~T6_E~0 2) (= ~t6_i~0 0) (= ~t5_i~0 0) (not (= ~p_dw_st~0 0)) (<= 1 |#StackHeapBarrier|) (= 0 ~t5_pc~0) (= ~E_4~0 2) (= v_~c_last_read~0_10 0) (= ~T11_E~0 2) (= ~t10_i~0 0) (= ~t7_i~0 0) (= ~t1_pc~0 0) (<= 0 |v_ULTIMATE.start_eval1_~tmp___1~0#1_BEFORE_CALL_1|) (= |v_ULTIMATE.start_start_simulation1_~kernel_st~0#1_BEFORE_CALL_30| 1) (= 0 ~t8_pc~0) (= 0 ~t7_pc~0) (= ~T4_E~0 2) (= ~E_13~0 2) (= ~E_7~0 2) (= ~E_8~0 2) (= 0 ~t4_st~0) (= ~T1_E~0 2) (= ~T5_E~0 2) (= ~t13_st~0 0) (<= 0 ~p_dw_pc~0) (= ~m_st~0 0) (= ~E_5~0 2) (<= 0 ~p_num_write~0) (= ~E_10~0 2) (= ~T2_E~0 2) (= 1 ~c_dr_i~0) (= ~T9_E~0 2) (= 0 ~t6_pc~0) (= 0 ~t5_st~0) (= ~E_3~0 2) (= 0 ~t3_pc~0) (= 0 ~t6_st~0) (= ~t9_i~0 0) (= ~t2_i~0 0) (= 0 ~t8_st~0) (= ~E_6~0 2) (= ~t4_i~0 0) (= ~E_11~0 2) (= ~t1_st~0 0) (= ~c_num_read~0 1) (= ~T7_E~0 2) (= ~m_i~0 0) (= ~t10_st~0 0) (= ~t10_pc~0 0) (= 0 ~t9_pc~0) (= ~t11_pc~0 0) (= ~T12_E~0 2) (= ~t11_i~0 0) (= ~T13_E~0 2) (= ~t12_pc~0 0) (= ~E_2~0 2) (not (= v_~q_free~0_42 1)) (= ~T3_E~0 2) (= ~t12_i~0 0) (= ~local~0 0) (= ~t3_i~0 0) (= 0 ~t7_st~0) (= ~t8_i~0 0) (= ~t13_i~0 0) (not (= |v_ULTIMATE.start_eval1_~tmp___1~0#1_BEFORE_CALL_1| 0)) (= ~token~0 0) (= ~m_pc~0 0) (= 0 ~t9_st~0) (= ~T10_E~0 2) (= ~p_dw_i~0 1) (= 0 ~t2_pc~0) (= ~E_M~0 2) (= ~a_t~0 0) (= 0 ~t2_st~0) (<= |v_ULTIMATE.start_eval1_~tmp___1~0#1_BEFORE_CALL_1| 1) (= ~t12_st~0 0) (= 0 ~t4_pc~0) (= ~t13_pc~0 0) (= ~t11_st~0 0) (<= v_~q_free~0_42 1) (= ~E_1~0 2) (= 0 ~t3_st~0) (= ~T8_E~0 2) (= ~M_E~0 2) (= ~E_9~0 2) (= ~t1_i~0 0))) (not (= ~c_num_read~0 ~p_num_write~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 13:16:30,449 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 13:16:30,450 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 13:16:30,450 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 4] total 7 [2023-12-02 13:16:30,450 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [557698086] [2023-12-02 13:16:30,450 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 13:16:30,450 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-12-02 13:16:30,450 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 13:16:30,451 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-12-02 13:16:30,452 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=247, Invalid=1915, Unknown=0, NotChecked=0, Total=2162 [2023-12-02 13:16:30,452 INFO L87 Difference]: Start difference. First operand 745 states and 920 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 13:16:31,082 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 13:16:31,082 INFO L93 Difference]: Finished difference Result 1839 states and 2161 transitions. [2023-12-02 13:16:31,083 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-12-02 13:16:31,083 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 13:16:31,083 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 13:16:31,090 INFO L225 Difference]: With dead ends: 1839 [2023-12-02 13:16:31,090 INFO L226 Difference]: Without dead ends: 1836 [2023-12-02 13:16:31,092 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 148 SyntacticMatches, 2 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 951 ImplicationChecksByTransitivity, 37.2s TimeCoverageRelationStatistics Valid=247, Invalid=1915, Unknown=0, NotChecked=0, Total=2162 [2023-12-02 13:16:31,092 INFO L413 NwaCegarLoop]: 442 mSDtfsCounter, 938 mSDsluCounter, 673 mSDsCounter, 0 mSdLazyCounter, 508 mSolverCounterSat, 98 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 938 SdHoareTripleChecker+Valid, 1115 SdHoareTripleChecker+Invalid, 606 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 98 IncrementalHoareTripleChecker+Valid, 508 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 13:16:31,092 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [938 Valid, 1115 Invalid, 606 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [98 Valid, 508 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 13:16:31,094 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1836 states. [2023-12-02 13:16:31,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1836 to 1259. [2023-12-02 13:16:31,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1259 states, 910 states have (on average 1.2307692307692308) internal successors, (1120), 914 states have internal predecessors, (1120), 195 states have call successors, (195), 154 states have call predecessors, (195), 152 states have return successors, (192), 192 states have call predecessors, (192), 192 states have call successors, (192) [2023-12-02 13:16:31,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1259 states to 1259 states and 1507 transitions. [2023-12-02 13:16:31,323 INFO L78 Accepts]: Start accepts. Automaton has 1259 states and 1507 transitions. Word has length 64 [2023-12-02 13:16:31,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 13:16:31,323 INFO L495 AbstractCegarLoop]: Abstraction has 1259 states and 1507 transitions. [2023-12-02 13:16:31,324 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 13:16:31,324 INFO L276 IsEmpty]: Start isEmpty. Operand 1259 states and 1507 transitions. [2023-12-02 13:16:31,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2023-12-02 13:16:31,326 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 13:16:31,326 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 13:16:31,332 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-12-02 13:16:31,526 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:16:31,527 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 13:16:31,527 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 13:16:31,527 INFO L85 PathProgramCache]: Analyzing trace with hash -390031767, now seen corresponding path program 2 times [2023-12-02 13:16:31,527 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 13:16:31,527 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [777977233] [2023-12-02 13:16:31,527 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:16:31,528 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 13:16:31,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:16:31,576 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 13:16:31,576 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 13:16:31,576 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [777977233] [2023-12-02 13:16:31,576 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [777977233] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 13:16:31,576 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 13:16:31,577 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 13:16:31,577 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1584937109] [2023-12-02 13:16:31,577 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 13:16:31,577 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 13:16:31,577 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 13:16:31,578 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 13:16:31,578 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 13:16:31,578 INFO L87 Difference]: Start difference. First operand 1259 states and 1507 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 13:16:31,872 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 13:16:31,872 INFO L93 Difference]: Finished difference Result 2011 states and 2363 transitions. [2023-12-02 13:16:31,872 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 13:16:31,873 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 13:16:31,873 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 13:16:31,878 INFO L225 Difference]: With dead ends: 2011 [2023-12-02 13:16:31,878 INFO L226 Difference]: Without dead ends: 1255 [2023-12-02 13:16:31,880 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 13:16:31,881 INFO L413 NwaCegarLoop]: 392 mSDtfsCounter, 389 mSDsluCounter, 66 mSDsCounter, 0 mSdLazyCounter, 93 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 389 SdHoareTripleChecker+Valid, 458 SdHoareTripleChecker+Invalid, 95 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 93 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 13:16:31,881 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [389 Valid, 458 Invalid, 95 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 93 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 13:16:31,882 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1255 states. [2023-12-02 13:16:32,020 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1255 to 1244. [2023-12-02 13:16:32,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1244 states, 895 states have (on average 1.217877094972067) internal successors, (1090), 899 states have internal predecessors, (1090), 195 states have call successors, (195), 154 states have call predecessors, (195), 152 states have return successors, (192), 192 states have call predecessors, (192), 192 states have call successors, (192) [2023-12-02 13:16:32,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1244 states to 1244 states and 1477 transitions. [2023-12-02 13:16:32,026 INFO L78 Accepts]: Start accepts. Automaton has 1244 states and 1477 transitions. Word has length 67 [2023-12-02 13:16:32,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 13:16:32,026 INFO L495 AbstractCegarLoop]: Abstraction has 1244 states and 1477 transitions. [2023-12-02 13:16:32,026 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 13:16:32,026 INFO L276 IsEmpty]: Start isEmpty. Operand 1244 states and 1477 transitions. [2023-12-02 13:16:32,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2023-12-02 13:16:32,028 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 13:16:32,028 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 13:16:32,028 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2023-12-02 13:16:32,028 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 13:16:32,029 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 13:16:32,029 INFO L85 PathProgramCache]: Analyzing trace with hash -1284343529, now seen corresponding path program 1 times [2023-12-02 13:16:32,029 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 13:16:32,029 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [26139888] [2023-12-02 13:16:32,029 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:16:32,029 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 13:16:32,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:16:32,067 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 13:16:32,067 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 13:16:32,067 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [26139888] [2023-12-02 13:16:32,068 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [26139888] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 13:16:32,068 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 13:16:32,068 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 13:16:32,068 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1481774294] [2023-12-02 13:16:32,068 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 13:16:32,068 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 13:16:32,068 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 13:16:32,069 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 13:16:32,069 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 13:16:32,069 INFO L87 Difference]: Start difference. First operand 1244 states and 1477 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 13:16:32,349 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 13:16:32,349 INFO L93 Difference]: Finished difference Result 2210 states and 2571 transitions. [2023-12-02 13:16:32,349 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 13:16:32,349 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 13:16:32,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 13:16:32,355 INFO L225 Difference]: With dead ends: 2210 [2023-12-02 13:16:32,355 INFO L226 Difference]: Without dead ends: 1420 [2023-12-02 13:16:32,357 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 13:16:32,357 INFO L413 NwaCegarLoop]: 379 mSDtfsCounter, 37 mSDsluCounter, 345 mSDsCounter, 0 mSdLazyCounter, 139 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 724 SdHoareTripleChecker+Invalid, 139 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 139 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 13:16:32,357 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [37 Valid, 724 Invalid, 139 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 139 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 13:16:32,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1420 states. [2023-12-02 13:16:32,514 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1420 to 1291. [2023-12-02 13:16:32,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1291 states, 934 states have (on average 1.2162740899357602) internal successors, (1136), 938 states have internal predecessors, (1136), 199 states have call successors, (199), 158 states have call predecessors, (199), 156 states have return successors, (196), 196 states have call predecessors, (196), 196 states have call successors, (196) [2023-12-02 13:16:32,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1291 states to 1291 states and 1531 transitions. [2023-12-02 13:16:32,520 INFO L78 Accepts]: Start accepts. Automaton has 1291 states and 1531 transitions. Word has length 71 [2023-12-02 13:16:32,520 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 13:16:32,520 INFO L495 AbstractCegarLoop]: Abstraction has 1291 states and 1531 transitions. [2023-12-02 13:16:32,521 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 13:16:32,521 INFO L276 IsEmpty]: Start isEmpty. Operand 1291 states and 1531 transitions. [2023-12-02 13:16:32,522 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2023-12-02 13:16:32,522 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 13:16:32,522 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 13:16:32,522 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2023-12-02 13:16:32,523 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 13:16:32,523 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 13:16:32,523 INFO L85 PathProgramCache]: Analyzing trace with hash 983625774, now seen corresponding path program 1 times [2023-12-02 13:16:32,523 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 13:16:32,523 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1862958566] [2023-12-02 13:16:32,523 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:16:32,523 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 13:16:32,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:16:32,607 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 13:16:32,607 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 13:16:32,607 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1862958566] [2023-12-02 13:16:32,608 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1862958566] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 13:16:32,608 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 13:16:32,608 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-12-02 13:16:32,608 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [572780461] [2023-12-02 13:16:32,608 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 13:16:32,608 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 13:16:32,608 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 13:16:32,609 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 13:16:32,609 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-12-02 13:16:32,609 INFO L87 Difference]: Start difference. First operand 1291 states and 1531 transitions. Second operand has 5 states, 5 states have (on average 12.0) internal successors, (60), 5 states have internal predecessors, (60), 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 13:16:33,559 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 13:16:33,559 INFO L93 Difference]: Finished difference Result 2304 states and 3173 transitions. [2023-12-02 13:16:33,560 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-12-02 13:16:33,560 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 12.0) internal successors, (60), 5 states have internal predecessors, (60), 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 71 [2023-12-02 13:16:33,560 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 13:16:33,569 INFO L225 Difference]: With dead ends: 2304 [2023-12-02 13:16:33,569 INFO L226 Difference]: Without dead ends: 2093 [2023-12-02 13:16:33,571 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 13:16:33,571 INFO L413 NwaCegarLoop]: 593 mSDtfsCounter, 1622 mSDsluCounter, 970 mSDsCounter, 0 mSdLazyCounter, 583 mSolverCounterSat, 253 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1623 SdHoareTripleChecker+Valid, 1563 SdHoareTripleChecker+Invalid, 836 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 253 IncrementalHoareTripleChecker+Valid, 583 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-12-02 13:16:33,572 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1623 Valid, 1563 Invalid, 836 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [253 Valid, 583 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-12-02 13:16:33,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2093 states. [2023-12-02 13:16:33,861 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2093 to 2080. [2023-12-02 13:16:33,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2080 states, 1610 states have (on average 1.3316770186335403) internal successors, (2144), 1617 states have internal predecessors, (2144), 288 states have call successors, (288), 182 states have call predecessors, (288), 180 states have return successors, (351), 282 states have call predecessors, (351), 285 states have call successors, (351) [2023-12-02 13:16:33,876 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2080 states to 2080 states and 2783 transitions. [2023-12-02 13:16:33,876 INFO L78 Accepts]: Start accepts. Automaton has 2080 states and 2783 transitions. Word has length 71 [2023-12-02 13:16:33,876 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 13:16:33,877 INFO L495 AbstractCegarLoop]: Abstraction has 2080 states and 2783 transitions. [2023-12-02 13:16:33,877 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 12.0) internal successors, (60), 5 states have internal predecessors, (60), 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 13:16:33,877 INFO L276 IsEmpty]: Start isEmpty. Operand 2080 states and 2783 transitions. [2023-12-02 13:16:33,880 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2023-12-02 13:16:33,880 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 13:16:33,880 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 13:16:33,880 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2023-12-02 13:16:33,881 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 13:16:33,881 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 13:16:33,881 INFO L85 PathProgramCache]: Analyzing trace with hash -602490777, now seen corresponding path program 1 times [2023-12-02 13:16:33,881 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 13:16:33,881 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2122512991] [2023-12-02 13:16:33,881 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:16:33,881 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 13:16:33,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:16:34,218 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 13:16:34,219 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 13:16:34,219 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2122512991] [2023-12-02 13:16:34,219 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2122512991] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 13:16:34,219 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1605118963] [2023-12-02 13:16:34,219 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:16:34,219 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:16:34,219 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 13:16:34,221 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 13:16:34,223 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-12-02 13:16:34,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:16:34,369 INFO L262 TraceCheckSpWp]: Trace formula consists of 528 conjuncts, 13 conjunts are in the unsatisfiable core [2023-12-02 13:16:34,373 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 13:16:34,416 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 13:16:34,416 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 13:16:34,416 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1605118963] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 13:16:34,416 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 13:16:34,416 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [14] total 17 [2023-12-02 13:16:34,416 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [621197593] [2023-12-02 13:16:34,416 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 13:16:34,417 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 13:16:34,417 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 13:16:34,417 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 13:16:34,417 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2023-12-02 13:16:34,418 INFO L87 Difference]: Start difference. First operand 2080 states and 2783 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 13:16:34,903 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 13:16:34,903 INFO L93 Difference]: Finished difference Result 2942 states and 3787 transitions. [2023-12-02 13:16:34,904 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-12-02 13:16:34,904 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 13:16:34,904 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 13:16:34,913 INFO L225 Difference]: With dead ends: 2942 [2023-12-02 13:16:34,914 INFO L226 Difference]: Without dead ends: 1895 [2023-12-02 13:16:34,916 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 13:16:34,916 INFO L413 NwaCegarLoop]: 394 mSDtfsCounter, 383 mSDsluCounter, 1093 mSDsCounter, 0 mSdLazyCounter, 359 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 385 SdHoareTripleChecker+Valid, 1487 SdHoareTripleChecker+Invalid, 360 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 359 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 13:16:34,917 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [385 Valid, 1487 Invalid, 360 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 359 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 13:16:34,918 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1895 states. [2023-12-02 13:16:35,152 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1895 to 1710. [2023-12-02 13:16:35,155 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1710 states, 1372 states have (on average 1.3651603498542273) internal successors, (1873), 1379 states have internal predecessors, (1873), 217 states have call successors, (217), 121 states have call predecessors, (217), 119 states have return successors, (280), 211 states have call predecessors, (280), 214 states have call successors, (280) [2023-12-02 13:16:35,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1710 states to 1710 states and 2370 transitions. [2023-12-02 13:16:35,161 INFO L78 Accepts]: Start accepts. Automaton has 1710 states and 2370 transitions. Word has length 102 [2023-12-02 13:16:35,162 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 13:16:35,162 INFO L495 AbstractCegarLoop]: Abstraction has 1710 states and 2370 transitions. [2023-12-02 13:16:35,162 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 13:16:35,162 INFO L276 IsEmpty]: Start isEmpty. Operand 1710 states and 2370 transitions. [2023-12-02 13:16:35,165 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2023-12-02 13:16:35,165 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 13:16:35,165 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 13:16:35,171 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-12-02 13:16:35,368 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2023-12-02 13:16:35,368 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 13:16:35,368 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 13:16:35,368 INFO L85 PathProgramCache]: Analyzing trace with hash -864969747, now seen corresponding path program 1 times [2023-12-02 13:16:35,368 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 13:16:35,368 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [241006660] [2023-12-02 13:16:35,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:16:35,369 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 13:16:35,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:16:35,547 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 13:16:35,547 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 13:16:35,547 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [241006660] [2023-12-02 13:16:35,547 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [241006660] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 13:16:35,547 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1054849030] [2023-12-02 13:16:35,548 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:16:35,548 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:16:35,548 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 13:16:35,549 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 13:16:35,551 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-12-02 13:16:35,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:16:35,699 INFO L262 TraceCheckSpWp]: Trace formula consists of 559 conjuncts, 14 conjunts are in the unsatisfiable core [2023-12-02 13:16:35,704 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 13:16:35,785 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 13:16:35,785 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 13:16:35,785 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1054849030] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 13:16:35,786 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 13:16:35,786 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [8] total 13 [2023-12-02 13:16:35,786 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [84520630] [2023-12-02 13:16:35,786 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 13:16:35,786 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-12-02 13:16:35,787 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 13:16:35,787 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-12-02 13:16:35,787 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2023-12-02 13:16:35,788 INFO L87 Difference]: Start difference. First operand 1710 states and 2370 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 13:16:36,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 13:16:36,295 INFO L93 Difference]: Finished difference Result 2259 states and 2995 transitions. [2023-12-02 13:16:36,295 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-12-02 13:16:36,295 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 13:16:36,296 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 13:16:36,303 INFO L225 Difference]: With dead ends: 2259 [2023-12-02 13:16:36,303 INFO L226 Difference]: Without dead ends: 1666 [2023-12-02 13:16:36,305 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 13:16:36,305 INFO L413 NwaCegarLoop]: 392 mSDtfsCounter, 65 mSDsluCounter, 1507 mSDsCounter, 0 mSdLazyCounter, 433 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 1899 SdHoareTripleChecker+Invalid, 436 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 433 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 13:16:36,306 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [66 Valid, 1899 Invalid, 436 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 433 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 13:16:36,308 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1666 states. [2023-12-02 13:16:36,480 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1666 to 1574. [2023-12-02 13:16:36,482 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1574 states, 1272 states have (on average 1.380503144654088) internal successors, (1756), 1279 states have internal predecessors, (1756), 198 states have call successors, (198), 104 states have call predecessors, (198), 102 states have return successors, (261), 192 states have call predecessors, (261), 195 states have call successors, (261) [2023-12-02 13:16:36,486 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1574 states to 1574 states and 2215 transitions. [2023-12-02 13:16:36,486 INFO L78 Accepts]: Start accepts. Automaton has 1574 states and 2215 transitions. Word has length 112 [2023-12-02 13:16:36,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 13:16:36,486 INFO L495 AbstractCegarLoop]: Abstraction has 1574 states and 2215 transitions. [2023-12-02 13:16:36,487 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 13:16:36,487 INFO L276 IsEmpty]: Start isEmpty. Operand 1574 states and 2215 transitions. [2023-12-02 13:16:36,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2023-12-02 13:16:36,489 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 13:16:36,489 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 13:16:36,493 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-12-02 13:16:36,692 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2023-12-02 13:16:36,692 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 13:16:36,692 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 13:16:36,692 INFO L85 PathProgramCache]: Analyzing trace with hash 1361186698, now seen corresponding path program 1 times [2023-12-02 13:16:36,692 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 13:16:36,693 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [25252157] [2023-12-02 13:16:36,693 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:16:36,693 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 13:16:36,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:16:36,873 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 13:16:36,873 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 13:16:36,874 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [25252157] [2023-12-02 13:16:36,874 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [25252157] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 13:16:36,874 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2014042157] [2023-12-02 13:16:36,874 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:16:36,874 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:16:36,874 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 13:16:36,875 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 13:16:36,880 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-12-02 13:16:37,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:16:37,029 INFO L262 TraceCheckSpWp]: Trace formula consists of 565 conjuncts, 6 conjunts are in the unsatisfiable core [2023-12-02 13:16:37,032 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 13:16:37,087 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 13:16:37,088 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 13:16:37,088 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2014042157] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 13:16:37,088 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 13:16:37,088 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [8] total 11 [2023-12-02 13:16:37,088 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [121349658] [2023-12-02 13:16:37,088 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 13:16:37,088 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 13:16:37,088 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 13:16:37,089 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 13:16:37,089 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2023-12-02 13:16:37,089 INFO L87 Difference]: Start difference. First operand 1574 states and 2215 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 13:16:37,475 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 13:16:37,475 INFO L93 Difference]: Finished difference Result 2323 states and 3060 transitions. [2023-12-02 13:16:37,475 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-12-02 13:16:37,475 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 13:16:37,476 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 13:16:37,484 INFO L225 Difference]: With dead ends: 2323 [2023-12-02 13:16:37,484 INFO L226 Difference]: Without dead ends: 1866 [2023-12-02 13:16:37,486 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 13:16:37,486 INFO L413 NwaCegarLoop]: 384 mSDtfsCounter, 369 mSDsluCounter, 1212 mSDsCounter, 0 mSdLazyCounter, 318 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 370 SdHoareTripleChecker+Valid, 1596 SdHoareTripleChecker+Invalid, 321 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 318 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 13:16:37,486 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [370 Valid, 1596 Invalid, 321 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 318 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 13:16:37,488 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1866 states. [2023-12-02 13:16:37,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1866 to 1832. [2023-12-02 13:16:37,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1832 states, 1434 states have (on average 1.3500697350069735) internal successors, (1936), 1447 states have internal predecessors, (1936), 246 states have call successors, (246), 146 states have call predecessors, (246), 150 states have return successors, (321), 240 states have call predecessors, (321), 243 states have call successors, (321) [2023-12-02 13:16:37,752 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1832 states to 1832 states and 2503 transitions. [2023-12-02 13:16:37,752 INFO L78 Accepts]: Start accepts. Automaton has 1832 states and 2503 transitions. Word has length 113 [2023-12-02 13:16:37,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 13:16:37,753 INFO L495 AbstractCegarLoop]: Abstraction has 1832 states and 2503 transitions. [2023-12-02 13:16:37,753 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 13:16:37,753 INFO L276 IsEmpty]: Start isEmpty. Operand 1832 states and 2503 transitions. [2023-12-02 13:16:37,755 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2023-12-02 13:16:37,755 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 13:16:37,755 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 13:16:37,760 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-12-02 13:16:37,956 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2023-12-02 13:16:37,956 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 13:16:37,956 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 13:16:37,957 INFO L85 PathProgramCache]: Analyzing trace with hash -807128337, now seen corresponding path program 1 times [2023-12-02 13:16:37,957 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 13:16:37,957 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [76723623] [2023-12-02 13:16:37,957 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:16:37,957 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 13:16:37,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:16:38,816 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 22 proven. 18 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2023-12-02 13:16:38,816 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 13:16:38,816 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [76723623] [2023-12-02 13:16:38,817 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [76723623] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 13:16:38,817 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [244885640] [2023-12-02 13:16:38,817 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:16:38,817 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:16:38,817 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 13:16:38,818 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 13:16:38,828 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-12-02 13:16:38,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:16:38,961 INFO L262 TraceCheckSpWp]: Trace formula consists of 570 conjuncts, 59 conjunts are in the unsatisfiable core [2023-12-02 13:16:38,966 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 13:16:39,724 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 13:16:39,724 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 13:16:41,248 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 13:16:41,249 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [244885640] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 13:16:41,249 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1239734510] [2023-12-02 13:16:41,252 INFO L159 IcfgInterpreter]: Started Sifa with 68 locations of interest [2023-12-02 13:16:41,252 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 13:16:41,253 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 13:16:41,253 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 13:16:41,253 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 13:17:52,063 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events1 with input of size 7 for LOIs [2023-12-02 13:17:52,065 INFO L197 IcfgInterpreter]: Interpreting procedure error1 with input of size 13 for LOIs [2023-12-02 13:17:52,066 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread1 with input of size 7 for LOIs [2023-12-02 13:17:52,069 INFO L197 IcfgInterpreter]: Interpreting procedure activate_threads1 with input of size 234 for LOIs [2023-12-02 13:17:54,325 INFO L197 IcfgInterpreter]: Interpreting procedure is_do_write_p_triggered with input of size 235 for LOIs [2023-12-02 13:17:56,540 INFO L197 IcfgInterpreter]: Interpreting procedure is_do_read_c_triggered with input of size 16 for LOIs [2023-12-02 13:17:56,559 INFO L197 IcfgInterpreter]: Interpreting procedure fire_delta_events1 with input of size 228 for LOIs [2023-12-02 13:17:56,949 INFO L197 IcfgInterpreter]: Interpreting procedure update_channels1 with input of size 239 for LOIs [2023-12-02 13:17:57,369 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 13:18:11,659 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '55786#(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 13:18:11,659 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 13:18:11,659 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 13:18:11,660 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 17, 16] total 55 [2023-12-02 13:18:11,660 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [570979225] [2023-12-02 13:18:11,660 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 13:18:11,661 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2023-12-02 13:18:11,661 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 13:18:11,662 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2023-12-02 13:18:11,667 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=865, Invalid=10907, Unknown=0, NotChecked=0, Total=11772 [2023-12-02 13:18:11,668 INFO L87 Difference]: Start difference. First operand 1832 states and 2503 transitions. Second operand has 55 states, 35 states have (on average 5.6) internal successors, (196), 39 states have internal predecessors, (196), 20 states have call successors, (44), 16 states have call predecessors, (44), 23 states have return successors, (46), 20 states have call predecessors, (46), 20 states have call successors, (46) [2023-12-02 13:18:29,768 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 13:18:29,768 INFO L93 Difference]: Finished difference Result 4737 states and 6052 transitions. [2023-12-02 13:18:29,768 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 283 states. [2023-12-02 13:18:29,769 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 35 states have (on average 5.6) internal successors, (196), 39 states have internal predecessors, (196), 20 states have call successors, (44), 16 states have call predecessors, (44), 23 states have return successors, (46), 20 states have call predecessors, (46), 20 states have call successors, (46) Word has length 114 [2023-12-02 13:18:29,769 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 13:18:29,784 INFO L225 Difference]: With dead ends: 4737 [2023-12-02 13:18:29,785 INFO L226 Difference]: Without dead ends: 4022 [2023-12-02 13:18:29,810 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 681 GetRequests, 293 SyntacticMatches, 3 SemanticMatches, 385 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 61241 ImplicationChecksByTransitivity, 27.7s TimeCoverageRelationStatistics Valid=13483, Invalid=135899, Unknown=0, NotChecked=0, Total=149382 [2023-12-02 13:18:29,811 INFO L413 NwaCegarLoop]: 319 mSDtfsCounter, 6350 mSDsluCounter, 4438 mSDsCounter, 0 mSdLazyCounter, 7323 mSolverCounterSat, 2662 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6351 SdHoareTripleChecker+Valid, 4757 SdHoareTripleChecker+Invalid, 9985 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 2662 IncrementalHoareTripleChecker+Valid, 7323 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.4s IncrementalHoareTripleChecker+Time [2023-12-02 13:18:29,811 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6351 Valid, 4757 Invalid, 9985 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [2662 Valid, 7323 Invalid, 0 Unknown, 0 Unchecked, 4.4s Time] [2023-12-02 13:18:29,814 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4022 states. [2023-12-02 13:18:30,094 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4022 to 2108. [2023-12-02 13:18:30,097 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2108 states, 1618 states have (on average 1.326946847960445) internal successors, (2147), 1633 states have internal predecessors, (2147), 291 states have call successors, (291), 183 states have call predecessors, (291), 197 states have return successors, (378), 293 states have call predecessors, (378), 288 states have call successors, (378) [2023-12-02 13:18:30,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2108 states to 2108 states and 2816 transitions. [2023-12-02 13:18:30,104 INFO L78 Accepts]: Start accepts. Automaton has 2108 states and 2816 transitions. Word has length 114 [2023-12-02 13:18:30,104 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 13:18:30,104 INFO L495 AbstractCegarLoop]: Abstraction has 2108 states and 2816 transitions. [2023-12-02 13:18:30,105 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 35 states have (on average 5.6) internal successors, (196), 39 states have internal predecessors, (196), 20 states have call successors, (44), 16 states have call predecessors, (44), 23 states have return successors, (46), 20 states have call predecessors, (46), 20 states have call successors, (46) [2023-12-02 13:18:30,105 INFO L276 IsEmpty]: Start isEmpty. Operand 2108 states and 2816 transitions. [2023-12-02 13:18:30,107 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2023-12-02 13:18:30,107 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 13:18:30,107 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 13:18:30,112 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-12-02 13:18:30,308 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2023-12-02 13:18:30,308 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 13:18:30,308 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 13:18:30,309 INFO L85 PathProgramCache]: Analyzing trace with hash -762611099, now seen corresponding path program 1 times [2023-12-02 13:18:30,309 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 13:18:30,309 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1406711877] [2023-12-02 13:18:30,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:18:30,309 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 13:18:30,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:18:30,584 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 13:18:30,584 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 13:18:30,584 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1406711877] [2023-12-02 13:18:30,584 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1406711877] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 13:18:30,584 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1564723013] [2023-12-02 13:18:30,584 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:18:30,585 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:18:30,585 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 13:18:30,586 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 13:18:30,592 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-12-02 13:18:30,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:18:30,743 INFO L262 TraceCheckSpWp]: Trace formula consists of 569 conjuncts, 22 conjunts are in the unsatisfiable core [2023-12-02 13:18:30,747 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 13:18:30,825 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 13:18:30,825 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 13:18:30,980 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 13:18:30,980 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1564723013] provided 1 perfect and 1 imperfect interpolant sequences [2023-12-02 13:18:30,980 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-12-02 13:18:30,980 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [14, 8] total 20 [2023-12-02 13:18:30,980 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1182621147] [2023-12-02 13:18:30,980 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 13:18:30,981 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-12-02 13:18:30,981 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 13:18:30,982 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-12-02 13:18:30,982 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2023-12-02 13:18:30,982 INFO L87 Difference]: Start difference. First operand 2108 states and 2816 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 13:18:31,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 13:18:31,949 INFO L93 Difference]: Finished difference Result 3432 states and 4364 transitions. [2023-12-02 13:18:31,949 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-12-02 13:18:31,949 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 13:18:31,949 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 13:18:31,960 INFO L225 Difference]: With dead ends: 3432 [2023-12-02 13:18:31,960 INFO L226 Difference]: Without dead ends: 2441 [2023-12-02 13:18:31,962 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 13:18:31,963 INFO L413 NwaCegarLoop]: 295 mSDtfsCounter, 589 mSDsluCounter, 358 mSDsCounter, 0 mSdLazyCounter, 990 mSolverCounterSat, 110 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 592 SdHoareTripleChecker+Valid, 653 SdHoareTripleChecker+Invalid, 1100 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 110 IncrementalHoareTripleChecker+Valid, 990 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-12-02 13:18:31,963 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [592 Valid, 653 Invalid, 1100 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [110 Valid, 990 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-12-02 13:18:31,965 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2441 states. [2023-12-02 13:18:32,250 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2441 to 2188. [2023-12-02 13:18:32,254 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2188 states, 1663 states have (on average 1.3217077570655442) internal successors, (2198), 1681 states have internal predecessors, (2198), 310 states have call successors, (310), 192 states have call predecessors, (310), 213 states have return successors, (418), 316 states have call predecessors, (418), 307 states have call successors, (418) [2023-12-02 13:18:32,260 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2188 states to 2188 states and 2926 transitions. [2023-12-02 13:18:32,260 INFO L78 Accepts]: Start accepts. Automaton has 2188 states and 2926 transitions. Word has length 115 [2023-12-02 13:18:32,260 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 13:18:32,260 INFO L495 AbstractCegarLoop]: Abstraction has 2188 states and 2926 transitions. [2023-12-02 13:18:32,260 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 13:18:32,261 INFO L276 IsEmpty]: Start isEmpty. Operand 2188 states and 2926 transitions. [2023-12-02 13:18:32,263 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2023-12-02 13:18:32,263 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 13:18:32,263 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 13:18:32,267 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2023-12-02 13:18:32,463 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2023-12-02 13:18:32,464 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 13:18:32,464 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 13:18:32,464 INFO L85 PathProgramCache]: Analyzing trace with hash -816571488, now seen corresponding path program 1 times [2023-12-02 13:18:32,464 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 13:18:32,464 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [85254470] [2023-12-02 13:18:32,464 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:18:32,464 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 13:18:32,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:18:33,114 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 30 proven. 24 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2023-12-02 13:18:33,115 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 13:18:33,115 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [85254470] [2023-12-02 13:18:33,115 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [85254470] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 13:18:33,115 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [135529492] [2023-12-02 13:18:33,115 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:18:33,115 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:18:33,115 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 13:18:33,116 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 13:18:33,117 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-12-02 13:18:33,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:18:33,239 INFO L262 TraceCheckSpWp]: Trace formula consists of 597 conjuncts, 62 conjunts are in the unsatisfiable core [2023-12-02 13:18:33,242 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 13:18:33,967 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 13:18:33,967 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 13:18:35,476 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 13:18:35,476 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [135529492] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 13:18:35,476 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1253771992] [2023-12-02 13:18:35,478 INFO L159 IcfgInterpreter]: Started Sifa with 69 locations of interest [2023-12-02 13:18:35,478 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 13:18:35,479 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 13:18:35,479 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 13:18:35,479 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 13:19:07,064 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events1 with input of size 7 for LOIs [2023-12-02 13:19:07,066 INFO L197 IcfgInterpreter]: Interpreting procedure error1 with input of size 81 for LOIs [2023-12-02 13:19:07,110 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread1 with input of size 7 for LOIs [2023-12-02 13:19:07,113 INFO L197 IcfgInterpreter]: Interpreting procedure activate_threads1 with input of size 235 for LOIs [2023-12-02 13:19:09,461 INFO L197 IcfgInterpreter]: Interpreting procedure is_do_write_p_triggered with input of size 236 for LOIs [2023-12-02 13:19:11,696 INFO L197 IcfgInterpreter]: Interpreting procedure is_do_read_c_triggered with input of size 16 for LOIs [2023-12-02 13:19:11,717 INFO L197 IcfgInterpreter]: Interpreting procedure fire_delta_events1 with input of size 229 for LOIs [2023-12-02 13:19:12,108 INFO L197 IcfgInterpreter]: Interpreting procedure update_channels1 with input of size 240 for LOIs [2023-12-02 13:19:12,530 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 13:19:28,914 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '74318#(and (= ~q_req_up~0 1) (= ~q_free~0 1) (exists ((|v_ULTIMATE.start_eval1_~tmp___1~0#1_BEFORE_CALL_10| Int) (v_~q_req_up~0_101 Int) (|v_ULTIMATE.start_eval1_~tmp~2#1_BEFORE_CALL_12| Int) (v_~q_free~0_106 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) (<= 0 |v_ULTIMATE.start_eval1_~tmp___1~0#1_BEFORE_CALL_10|) (= |v_ULTIMATE.start_eval1_~tmp~2#1_BEFORE_CALL_12| 0) (<= |v_ULTIMATE.start_eval1_~tmp___1~0#1_BEFORE_CALL_10| 1))) (or (exists ((v_~p_dw_st~0_137 Int) (v_~p_dw_pc~0_48 Int)) (and (or (and (= v_~p_dw_st~0_137 1) (<= 0 (+ |v_ULTIMATE.start_eval1_~tmp~2#1_BEFORE_CALL_12| 2147483648)) (<= |v_ULTIMATE.start_eval1_~tmp~2#1_BEFORE_CALL_12| 2147483647) (<= 0 |v_ULTIMATE.start_eval1_~tmp___1~0#1_BEFORE_CALL_10|) (<= |v_ULTIMATE.start_eval1_~tmp___1~0#1_BEFORE_CALL_10| 1) (= v_~p_dw_pc~0_48 0)) (and (= v_~p_dw_st~0_137 1) (<= 0 (+ |v_ULTIMATE.start_eval1_~tmp~2#1_BEFORE_CALL_12| 2147483648)) (<= |v_ULTIMATE.start_eval1_~tmp~2#1_BEFORE_CALL_12| 2147483647) (<= 0 (+ ~p_last_write~0 2147483648)) (= v_~q_req_up~0_101 1) (<= 0 |v_ULTIMATE.start_eval1_~tmp___1~0#1_BEFORE_CALL_10|) (<= ~p_last_write~0 2147483647) (<= |v_ULTIMATE.start_eval1_~tmp___1~0#1_BEFORE_CALL_10| 1) (= v_~p_dw_pc~0_48 1))) (not (= |v_ULTIMATE.start_eval1_~tmp~2#1_BEFORE_CALL_12| 0)) (not (= |v_ULTIMATE.start_eval1_~tmp___1~0#1_BEFORE_CALL_10| 0)))) (and (= ~p_dw_st~0 0) (not (= |v_ULTIMATE.start_eval1_~tmp___1~0#1_BEFORE_CALL_10| 0)))))) (= ~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) (exists ((|v_ULTIMATE.start_eval1_~tmp___0~2#1_BEFORE_CALL_15| Int)) (and (<= |v_ULTIMATE.start_eval1_~tmp___0~2#1_BEFORE_CALL_15| 2147483647) (<= 0 (+ |v_ULTIMATE.start_eval1_~tmp___0~2#1_BEFORE_CALL_15| 2147483648)) (not (= |v_ULTIMATE.start_eval1_~tmp___0~2#1_BEFORE_CALL_15| 0)))) (= ~c_dr_st~0 1))' at error location [2023-12-02 13:19:28,914 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 13:19:28,914 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 13:19:28,914 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 18] total 51 [2023-12-02 13:19:28,915 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1210642533] [2023-12-02 13:19:28,915 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 13:19:28,915 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2023-12-02 13:19:28,915 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 13:19:28,916 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2023-12-02 13:19:28,917 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=954, Invalid=10602, Unknown=0, NotChecked=0, Total=11556 [2023-12-02 13:19:28,918 INFO L87 Difference]: Start difference. First operand 2188 states and 2926 transitions. Second operand has 51 states, 34 states have (on average 6.264705882352941) internal successors, (213), 39 states have internal predecessors, (213), 24 states have call successors, (49), 15 states have call predecessors, (49), 21 states have return successors, (51), 23 states have call predecessors, (51), 24 states have call successors, (51) [2023-12-02 13:19:36,448 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 13:19:36,448 INFO L93 Difference]: Finished difference Result 4393 states and 5505 transitions. [2023-12-02 13:19:36,448 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 103 states. [2023-12-02 13:19:36,449 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 34 states have (on average 6.264705882352941) internal successors, (213), 39 states have internal predecessors, (213), 24 states have call successors, (49), 15 states have call predecessors, (49), 21 states have return successors, (51), 23 states have call predecessors, (51), 24 states have call successors, (51) Word has length 124 [2023-12-02 13:19:36,449 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 13:19:36,462 INFO L225 Difference]: With dead ends: 4393 [2023-12-02 13:19:36,462 INFO L226 Difference]: Without dead ends: 3322 [2023-12-02 13:19:36,467 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 526 GetRequests, 310 SyntacticMatches, 9 SemanticMatches, 207 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 17925 ImplicationChecksByTransitivity, 20.2s TimeCoverageRelationStatistics Valid=4299, Invalid=39173, Unknown=0, NotChecked=0, Total=43472 [2023-12-02 13:19:36,468 INFO L413 NwaCegarLoop]: 280 mSDtfsCounter, 5147 mSDsluCounter, 3208 mSDsCounter, 0 mSdLazyCounter, 6312 mSolverCounterSat, 2229 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5147 SdHoareTripleChecker+Valid, 3488 SdHoareTripleChecker+Invalid, 8541 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2229 IncrementalHoareTripleChecker+Valid, 6312 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.4s IncrementalHoareTripleChecker+Time [2023-12-02 13:19:36,468 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5147 Valid, 3488 Invalid, 8541 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2229 Valid, 6312 Invalid, 0 Unknown, 0 Unchecked, 3.4s Time] [2023-12-02 13:19:36,472 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3322 states. [2023-12-02 13:19:36,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3322 to 2004. [2023-12-02 13:19:36,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2004 states, 1551 states have (on average 1.3346228239845261) internal successors, (2070), 1568 states have internal predecessors, (2070), 270 states have call successors, (270), 160 states have call predecessors, (270), 181 states have return successors, (368), 277 states have call predecessors, (368), 267 states have call successors, (368) [2023-12-02 13:19:36,768 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2004 states to 2004 states and 2708 transitions. [2023-12-02 13:19:36,769 INFO L78 Accepts]: Start accepts. Automaton has 2004 states and 2708 transitions. Word has length 124 [2023-12-02 13:19:36,769 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 13:19:36,769 INFO L495 AbstractCegarLoop]: Abstraction has 2004 states and 2708 transitions. [2023-12-02 13:19:36,770 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 34 states have (on average 6.264705882352941) internal successors, (213), 39 states have internal predecessors, (213), 24 states have call successors, (49), 15 states have call predecessors, (49), 21 states have return successors, (51), 23 states have call predecessors, (51), 24 states have call successors, (51) [2023-12-02 13:19:36,770 INFO L276 IsEmpty]: Start isEmpty. Operand 2004 states and 2708 transitions. [2023-12-02 13:19:36,773 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2023-12-02 13:19:36,773 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 13:19:36,773 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 13:19:36,779 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2023-12-02 13:19:36,974 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:19:36,974 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 13:19:36,974 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 13:19:36,974 INFO L85 PathProgramCache]: Analyzing trace with hash 858459046, now seen corresponding path program 1 times [2023-12-02 13:19:36,974 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 13:19:36,975 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [601663791] [2023-12-02 13:19:36,975 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:19:36,975 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 13:19:36,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:19:37,122 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 13:19:37,123 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 13:19:37,123 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [601663791] [2023-12-02 13:19:37,123 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [601663791] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 13:19:37,123 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [137078531] [2023-12-02 13:19:37,123 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:19:37,123 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:19:37,123 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 13:19:37,124 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 13:19:37,127 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-12-02 13:19:37,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:19:37,278 INFO L262 TraceCheckSpWp]: Trace formula consists of 596 conjuncts, 23 conjunts are in the unsatisfiable core [2023-12-02 13:19:37,282 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 13:19:37,377 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 13:19:37,377 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 13:19:37,513 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 13:19:37,513 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [137078531] provided 1 perfect and 1 imperfect interpolant sequences [2023-12-02 13:19:37,514 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-12-02 13:19:37,514 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [9, 10] total 17 [2023-12-02 13:19:37,514 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1495308124] [2023-12-02 13:19:37,514 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 13:19:37,514 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-12-02 13:19:37,514 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 13:19:37,515 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-12-02 13:19:37,515 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2023-12-02 13:19:37,516 INFO L87 Difference]: Start difference. First operand 2004 states and 2708 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 13:19:38,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 13:19:38,452 INFO L93 Difference]: Finished difference Result 2659 states and 3449 transitions. [2023-12-02 13:19:38,453 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-12-02 13:19:38,453 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 13:19:38,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 13:19:38,461 INFO L225 Difference]: With dead ends: 2659 [2023-12-02 13:19:38,461 INFO L226 Difference]: Without dead ends: 1772 [2023-12-02 13:19:38,462 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 13:19:38,463 INFO L413 NwaCegarLoop]: 280 mSDtfsCounter, 863 mSDsluCounter, 352 mSDsCounter, 0 mSdLazyCounter, 1044 mSolverCounterSat, 174 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 864 SdHoareTripleChecker+Valid, 632 SdHoareTripleChecker+Invalid, 1218 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 174 IncrementalHoareTripleChecker+Valid, 1044 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-12-02 13:19:38,463 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [864 Valid, 632 Invalid, 1218 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [174 Valid, 1044 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-12-02 13:19:38,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1772 states. [2023-12-02 13:19:38,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1772 to 1735. [2023-12-02 13:19:38,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1735 states, 1352 states have (on average 1.3498520710059172) internal successors, (1825), 1369 states have internal predecessors, (1825), 234 states have call successors, (234), 130 states have call predecessors, (234), 147 states have return successors, (327), 237 states have call predecessors, (327), 231 states have call successors, (327) [2023-12-02 13:19:38,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1735 states to 1735 states and 2386 transitions. [2023-12-02 13:19:38,728 INFO L78 Accepts]: Start accepts. Automaton has 1735 states and 2386 transitions. Word has length 125 [2023-12-02 13:19:38,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 13:19:38,728 INFO L495 AbstractCegarLoop]: Abstraction has 1735 states and 2386 transitions. [2023-12-02 13:19:38,728 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 13:19:38,728 INFO L276 IsEmpty]: Start isEmpty. Operand 1735 states and 2386 transitions. [2023-12-02 13:19:38,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2023-12-02 13:19:38,743 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 13:19:38,743 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, 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 13:19:38,748 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2023-12-02 13:19:38,944 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:19:38,944 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 13:19:38,945 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 13:19:38,945 INFO L85 PathProgramCache]: Analyzing trace with hash -1216231458, now seen corresponding path program 1 times [2023-12-02 13:19:38,945 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 13:19:38,945 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [479783528] [2023-12-02 13:19:38,945 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:19:38,945 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 13:19:38,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:19:39,070 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-12-02 13:19:39,070 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 13:19:39,070 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [479783528] [2023-12-02 13:19:39,071 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [479783528] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 13:19:39,071 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1241715322] [2023-12-02 13:19:39,071 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:19:39,071 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:19:39,071 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 13:19:39,072 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 13:19:39,075 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-12-02 13:19:39,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:19:39,282 INFO L262 TraceCheckSpWp]: Trace formula consists of 1120 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 13:19:39,285 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 13:19:39,308 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2023-12-02 13:19:39,308 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 13:19:39,308 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1241715322] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 13:19:39,308 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 13:19:39,308 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-12-02 13:19:39,309 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [915991594] [2023-12-02 13:19:39,309 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 13:19:39,309 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 13:19:39,309 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 13:19:39,309 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 13:19:39,309 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 13:19:39,310 INFO L87 Difference]: Start difference. First operand 1735 states and 2386 transitions. Second operand has 3 states, 3 states have (on average 30.0) internal successors, (90), 2 states have internal predecessors, (90), 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 13:19:39,811 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 13:19:39,811 INFO L93 Difference]: Finished difference Result 3719 states and 5635 transitions. [2023-12-02 13:19:39,811 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 13:19:39,812 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 30.0) internal successors, (90), 2 states have internal predecessors, (90), 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 145 [2023-12-02 13:19:39,812 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 13:19:39,823 INFO L225 Difference]: With dead ends: 3719 [2023-12-02 13:19:39,823 INFO L226 Difference]: Without dead ends: 2719 [2023-12-02 13:19:39,827 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 145 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 13:19:39,828 INFO L413 NwaCegarLoop]: 345 mSDtfsCounter, 385 mSDsluCounter, 263 mSDsCounter, 0 mSdLazyCounter, 120 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 385 SdHoareTripleChecker+Valid, 608 SdHoareTripleChecker+Invalid, 122 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 120 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 13:19:39,828 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [385 Valid, 608 Invalid, 122 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 120 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 13:19:39,831 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2719 states. [2023-12-02 13:19:40,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2719 to 2710. [2023-12-02 13:19:40,144 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2710 states, 2190 states have (on average 1.4018264840182648) internal successors, (3070), 2210 states have internal predecessors, (3070), 341 states have call successors, (341), 160 states have call predecessors, (341), 177 states have return successors, (496), 341 states have call predecessors, (496), 338 states have call successors, (496) [2023-12-02 13:19:40,149 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2710 states to 2710 states and 3907 transitions. [2023-12-02 13:19:40,150 INFO L78 Accepts]: Start accepts. Automaton has 2710 states and 3907 transitions. Word has length 145 [2023-12-02 13:19:40,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 13:19:40,150 INFO L495 AbstractCegarLoop]: Abstraction has 2710 states and 3907 transitions. [2023-12-02 13:19:40,150 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 30.0) internal successors, (90), 2 states have internal predecessors, (90), 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 13:19:40,150 INFO L276 IsEmpty]: Start isEmpty. Operand 2710 states and 3907 transitions. [2023-12-02 13:19:40,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2023-12-02 13:19:40,154 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 13:19:40,154 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, 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 13:19:40,161 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2023-12-02 13:19:40,354 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:19:40,354 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 13:19:40,355 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 13:19:40,355 INFO L85 PathProgramCache]: Analyzing trace with hash 1676920544, now seen corresponding path program 1 times [2023-12-02 13:19:40,355 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 13:19:40,355 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1175984157] [2023-12-02 13:19:40,355 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:19:40,355 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 13:19:40,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:19:40,453 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-12-02 13:19:40,454 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 13:19:40,454 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1175984157] [2023-12-02 13:19:40,454 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1175984157] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 13:19:40,454 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1543921112] [2023-12-02 13:19:40,454 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:19:40,454 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:19:40,454 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 13:19:40,455 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 13:19:40,456 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-12-02 13:19:40,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:19:40,642 INFO L262 TraceCheckSpWp]: Trace formula consists of 1114 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 13:19:40,645 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 13:19:40,676 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 20 proven. 0 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2023-12-02 13:19:40,676 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 13:19:40,676 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1543921112] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 13:19:40,676 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 13:19:40,676 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-12-02 13:19:40,676 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1610934802] [2023-12-02 13:19:40,677 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 13:19:40,677 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 13:19:40,677 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 13:19:40,677 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 13:19:40,678 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 13:19:40,678 INFO L87 Difference]: Start difference. First operand 2710 states and 3907 transitions. Second operand has 3 states, 3 states have (on average 33.0) internal successors, (99), 2 states have internal predecessors, (99), 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 13:19:41,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 13:19:41,311 INFO L93 Difference]: Finished difference Result 6629 states and 10299 transitions. [2023-12-02 13:19:41,311 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 13:19:41,312 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 33.0) internal successors, (99), 2 states have internal predecessors, (99), 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 145 [2023-12-02 13:19:41,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 13:19:41,326 INFO L225 Difference]: With dead ends: 6629 [2023-12-02 13:19:41,326 INFO L226 Difference]: Without dead ends: 4654 [2023-12-02 13:19:41,333 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 145 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 13:19:41,333 INFO L413 NwaCegarLoop]: 345 mSDtfsCounter, 376 mSDsluCounter, 263 mSDsCounter, 0 mSdLazyCounter, 120 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 376 SdHoareTripleChecker+Valid, 608 SdHoareTripleChecker+Invalid, 122 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 120 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 13:19:41,334 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [376 Valid, 608 Invalid, 122 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 120 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 13:19:41,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4654 states. [2023-12-02 13:19:41,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4654 to 4640. [2023-12-02 13:19:41,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4640 states, 3851 states have (on average 1.4359906517787588) internal successors, (5530), 3877 states have internal predecessors, (5530), 550 states have call successors, (550), 220 states have call predecessors, (550), 237 states have return successors, (825), 544 states have call predecessors, (825), 547 states have call successors, (825) [2023-12-02 13:19:41,820 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4640 states to 4640 states and 6905 transitions. [2023-12-02 13:19:41,820 INFO L78 Accepts]: Start accepts. Automaton has 4640 states and 6905 transitions. Word has length 145 [2023-12-02 13:19:41,820 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 13:19:41,820 INFO L495 AbstractCegarLoop]: Abstraction has 4640 states and 6905 transitions. [2023-12-02 13:19:41,821 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 33.0) internal successors, (99), 2 states have internal predecessors, (99), 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 13:19:41,821 INFO L276 IsEmpty]: Start isEmpty. Operand 4640 states and 6905 transitions. [2023-12-02 13:19:41,826 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2023-12-02 13:19:41,826 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 13:19:41,827 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, 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 13:19:41,832 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2023-12-02 13:19:42,027 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:19:42,027 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 13:19:42,027 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 13:19:42,027 INFO L85 PathProgramCache]: Analyzing trace with hash -135234146, now seen corresponding path program 1 times [2023-12-02 13:19:42,028 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 13:19:42,028 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [794959442] [2023-12-02 13:19:42,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:19:42,028 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 13:19:42,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:19:42,130 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-12-02 13:19:42,130 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 13:19:42,130 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [794959442] [2023-12-02 13:19:42,130 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [794959442] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 13:19:42,130 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [607724989] [2023-12-02 13:19:42,130 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:19:42,130 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:19:42,130 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 13:19:42,131 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 13:19:42,133 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-12-02 13:19:42,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:19:42,366 INFO L262 TraceCheckSpWp]: Trace formula consists of 1108 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 13:19:42,369 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 13:19:42,399 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2023-12-02 13:19:42,399 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 13:19:42,400 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [607724989] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 13:19:42,400 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 13:19:42,400 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-12-02 13:19:42,400 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1557285120] [2023-12-02 13:19:42,400 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 13:19:42,400 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 13:19:42,401 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 13:19:42,401 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 13:19:42,401 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 13:19:42,401 INFO L87 Difference]: Start difference. First operand 4640 states and 6905 transitions. Second operand has 3 states, 3 states have (on average 31.0) internal successors, (93), 2 states have internal predecessors, (93), 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 13:19:43,317 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 13:19:43,317 INFO L93 Difference]: Finished difference Result 12389 states and 19486 transitions. [2023-12-02 13:19:43,318 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 13:19:43,318 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 31.0) internal successors, (93), 2 states have internal predecessors, (93), 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 145 [2023-12-02 13:19:43,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 13:19:43,338 INFO L225 Difference]: With dead ends: 12389 [2023-12-02 13:19:43,338 INFO L226 Difference]: Without dead ends: 8484 [2023-12-02 13:19:43,352 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 145 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 13:19:43,353 INFO L413 NwaCegarLoop]: 345 mSDtfsCounter, 382 mSDsluCounter, 263 mSDsCounter, 0 mSdLazyCounter, 120 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 382 SdHoareTripleChecker+Valid, 608 SdHoareTripleChecker+Invalid, 122 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 120 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 13:19:43,353 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [382 Valid, 608 Invalid, 122 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 120 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 13:19:43,360 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8484 states. [2023-12-02 13:19:44,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8484 to 8460. [2023-12-02 13:19:44,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8460 states, 7143 states have (on average 1.4545709085818284) internal successors, (10390), 7181 states have internal predecessors, (10390), 958 states have call successors, (958), 340 states have call predecessors, (958), 357 states have return successors, (1465), 940 states have call predecessors, (1465), 955 states have call successors, (1465) [2023-12-02 13:19:44,153 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8460 states to 8460 states and 12813 transitions. [2023-12-02 13:19:44,153 INFO L78 Accepts]: Start accepts. Automaton has 8460 states and 12813 transitions. Word has length 145 [2023-12-02 13:19:44,153 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 13:19:44,153 INFO L495 AbstractCegarLoop]: Abstraction has 8460 states and 12813 transitions. [2023-12-02 13:19:44,154 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 31.0) internal successors, (93), 2 states have internal predecessors, (93), 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 13:19:44,154 INFO L276 IsEmpty]: Start isEmpty. Operand 8460 states and 12813 transitions. [2023-12-02 13:19:44,163 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2023-12-02 13:19:44,163 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 13:19:44,163 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, 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 13:19:44,168 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2023-12-02 13:19:44,363 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:19:44,364 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 13:19:44,364 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 13:19:44,364 INFO L85 PathProgramCache]: Analyzing trace with hash -1880314404, now seen corresponding path program 1 times [2023-12-02 13:19:44,364 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 13:19:44,364 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [252011940] [2023-12-02 13:19:44,364 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:19:44,365 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 13:19:44,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:19:44,466 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-12-02 13:19:44,467 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 13:19:44,467 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [252011940] [2023-12-02 13:19:44,467 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [252011940] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 13:19:44,467 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1089898843] [2023-12-02 13:19:44,468 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:19:44,468 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:19:44,468 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 13:19:44,469 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 13:19:44,471 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-12-02 13:19:44,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:19:44,699 INFO L262 TraceCheckSpWp]: Trace formula consists of 1102 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 13:19:44,702 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 13:19:44,749 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 41 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-12-02 13:19:44,749 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 13:19:44,750 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1089898843] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 13:19:44,750 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 13:19:44,750 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-12-02 13:19:44,750 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1741575914] [2023-12-02 13:19:44,750 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 13:19:44,750 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 13:19:44,750 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 13:19:44,751 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 13:19:44,751 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 13:19:44,751 INFO L87 Difference]: Start difference. First operand 8460 states and 12813 transitions. Second operand has 3 states, 3 states have (on average 40.0) internal successors, (120), 2 states have internal predecessors, (120), 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 13:19:46,197 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 13:19:46,197 INFO L93 Difference]: Finished difference Result 23789 states and 37578 transitions. [2023-12-02 13:19:46,198 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 13:19:46,198 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 40.0) internal successors, (120), 2 states have internal predecessors, (120), 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 145 [2023-12-02 13:19:46,198 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 13:19:46,238 INFO L225 Difference]: With dead ends: 23789 [2023-12-02 13:19:46,238 INFO L226 Difference]: Without dead ends: 16064 [2023-12-02 13:19:46,262 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 145 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 13:19:46,262 INFO L413 NwaCegarLoop]: 345 mSDtfsCounter, 355 mSDsluCounter, 263 mSDsCounter, 0 mSdLazyCounter, 120 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 355 SdHoareTripleChecker+Valid, 608 SdHoareTripleChecker+Invalid, 122 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 120 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 13:19:46,262 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [355 Valid, 608 Invalid, 122 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 120 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 13:19:46,276 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16064 states. [2023-12-02 13:19:47,644 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16064 to 16020. [2023-12-02 13:19:47,655 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16020 states, 13667 states have (on average 1.4626472525060363) internal successors, (19990), 13729 states have internal predecessors, (19990), 1754 states have call successors, (1754), 580 states have call predecessors, (1754), 597 states have return successors, (2709), 1712 states have call predecessors, (2709), 1751 states have call successors, (2709) [2023-12-02 13:19:47,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16020 states to 16020 states and 24453 transitions. [2023-12-02 13:19:47,696 INFO L78 Accepts]: Start accepts. Automaton has 16020 states and 24453 transitions. Word has length 145 [2023-12-02 13:19:47,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 13:19:47,696 INFO L495 AbstractCegarLoop]: Abstraction has 16020 states and 24453 transitions. [2023-12-02 13:19:47,696 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 40.0) internal successors, (120), 2 states have internal predecessors, (120), 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 13:19:47,696 INFO L276 IsEmpty]: Start isEmpty. Operand 16020 states and 24453 transitions. [2023-12-02 13:19:47,710 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2023-12-02 13:19:47,710 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 13:19:47,711 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, 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 13:19:47,716 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2023-12-02 13:19:47,911 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2023-12-02 13:19:47,911 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 13:19:47,912 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 13:19:47,912 INFO L85 PathProgramCache]: Analyzing trace with hash -955941794, now seen corresponding path program 1 times [2023-12-02 13:19:47,912 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 13:19:47,912 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [643686249] [2023-12-02 13:19:47,912 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:19:47,912 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 13:19:47,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:19:48,022 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-12-02 13:19:48,023 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 13:19:48,023 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [643686249] [2023-12-02 13:19:48,023 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [643686249] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 13:19:48,023 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [488359409] [2023-12-02 13:19:48,023 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:19:48,023 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:19:48,023 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 13:19:48,024 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 13:19:48,025 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2023-12-02 13:19:48,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:19:48,237 INFO L262 TraceCheckSpWp]: Trace formula consists of 1096 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 13:19:48,239 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 13:19:48,275 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 32 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-12-02 13:19:48,276 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 13:19:48,276 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [488359409] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 13:19:48,276 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 13:19:48,276 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-12-02 13:19:48,276 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1245633950] [2023-12-02 13:19:48,276 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 13:19:48,276 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 13:19:48,277 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 13:19:48,277 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 13:19:48,277 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 13:19:48,277 INFO L87 Difference]: Start difference. First operand 16020 states and 24453 transitions. Second operand has 3 states, 3 states have (on average 37.0) internal successors, (111), 2 states have internal predecessors, (111), 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 13:19:50,861 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 13:19:50,861 INFO L93 Difference]: Finished difference Result 46349 states and 73198 transitions. [2023-12-02 13:19:50,861 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 13:19:50,862 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 37.0) internal successors, (111), 2 states have internal predecessors, (111), 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 145 [2023-12-02 13:19:50,862 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 13:19:50,939 INFO L225 Difference]: With dead ends: 46349 [2023-12-02 13:19:50,939 INFO L226 Difference]: Without dead ends: 31064 [2023-12-02 13:19:50,972 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 145 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 13:19:50,973 INFO L413 NwaCegarLoop]: 345 mSDtfsCounter, 364 mSDsluCounter, 263 mSDsCounter, 0 mSdLazyCounter, 120 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 364 SdHoareTripleChecker+Valid, 608 SdHoareTripleChecker+Invalid, 122 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 120 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 13:19:50,973 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [364 Valid, 608 Invalid, 122 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 120 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 13:19:50,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31064 states. [2023-12-02 13:19:53,740 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31064 to 30980. [2023-12-02 13:19:53,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30980 states, 26595 states have (on average 1.4645610077082158) internal successors, (38950), 26705 states have internal predecessors, (38950), 3306 states have call successors, (3306), 1060 states have call predecessors, (3306), 1077 states have return successors, (5125), 3216 states have call predecessors, (5125), 3303 states have call successors, (5125) [2023-12-02 13:19:53,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30980 states to 30980 states and 47381 transitions. [2023-12-02 13:19:53,842 INFO L78 Accepts]: Start accepts. Automaton has 30980 states and 47381 transitions. Word has length 145 [2023-12-02 13:19:53,842 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 13:19:53,842 INFO L495 AbstractCegarLoop]: Abstraction has 30980 states and 47381 transitions. [2023-12-02 13:19:53,842 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 37.0) internal successors, (111), 2 states have internal predecessors, (111), 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 13:19:53,842 INFO L276 IsEmpty]: Start isEmpty. Operand 30980 states and 47381 transitions. [2023-12-02 13:19:53,866 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2023-12-02 13:19:53,866 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 13:19:53,866 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, 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 13:19:53,871 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2023-12-02 13:19:54,067 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2023-12-02 13:19:54,067 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 13:19:54,067 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 13:19:54,068 INFO L85 PathProgramCache]: Analyzing trace with hash 826269724, now seen corresponding path program 1 times [2023-12-02 13:19:54,068 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 13:19:54,068 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2033470459] [2023-12-02 13:19:54,068 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:19:54,068 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 13:19:54,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:19:54,164 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-12-02 13:19:54,164 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 13:19:54,164 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2033470459] [2023-12-02 13:19:54,164 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2033470459] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 13:19:54,164 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1516110292] [2023-12-02 13:19:54,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:19:54,164 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:19:54,164 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 13:19:54,165 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 13:19:54,168 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2023-12-02 13:19:54,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:19:54,398 INFO L262 TraceCheckSpWp]: Trace formula consists of 1090 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 13:19:54,401 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 13:19:54,433 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 26 proven. 0 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2023-12-02 13:19:54,433 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 13:19:54,433 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1516110292] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 13:19:54,434 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 13:19:54,434 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-12-02 13:19:54,434 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1854287360] [2023-12-02 13:19:54,434 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 13:19:54,434 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 13:19:54,434 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 13:19:54,435 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 13:19:54,435 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 13:19:54,435 INFO L87 Difference]: Start difference. First operand 30980 states and 47381 transitions. Second operand has 3 states, 3 states have (on average 35.0) internal successors, (105), 2 states have internal predecessors, (105), 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 13:19:59,774 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 13:19:59,774 INFO L93 Difference]: Finished difference Result 90989 states and 143310 transitions. [2023-12-02 13:19:59,775 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 13:19:59,775 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 35.0) internal successors, (105), 2 states have internal predecessors, (105), 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 145 [2023-12-02 13:19:59,775 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 13:19:59,919 INFO L225 Difference]: With dead ends: 90989 [2023-12-02 13:19:59,919 INFO L226 Difference]: Without dead ends: 60744 [2023-12-02 13:19:59,986 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 145 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 13:19:59,987 INFO L413 NwaCegarLoop]: 345 mSDtfsCounter, 370 mSDsluCounter, 263 mSDsCounter, 0 mSdLazyCounter, 120 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 370 SdHoareTripleChecker+Valid, 608 SdHoareTripleChecker+Invalid, 122 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 120 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 13:19:59,987 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [370 Valid, 608 Invalid, 122 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 120 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 13:20:00,031 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60744 states. [2023-12-02 13:20:04,866 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60744 to 60580. [2023-12-02 13:20:04,896 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60580 states, 52211 states have (on average 1.4631016452471701) internal successors, (76390), 52417 states have internal predecessors, (76390), 6330 states have call successors, (6330), 2020 states have call predecessors, (6330), 2037 states have return successors, (9813), 6144 states have call predecessors, (9813), 6327 states have call successors, (9813) [2023-12-02 13:20:05,112 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60580 states to 60580 states and 92533 transitions. [2023-12-02 13:20:05,114 INFO L78 Accepts]: Start accepts. Automaton has 60580 states and 92533 transitions. Word has length 145 [2023-12-02 13:20:05,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 13:20:05,115 INFO L495 AbstractCegarLoop]: Abstraction has 60580 states and 92533 transitions. [2023-12-02 13:20:05,115 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 35.0) internal successors, (105), 2 states have internal predecessors, (105), 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 13:20:05,115 INFO L276 IsEmpty]: Start isEmpty. Operand 60580 states and 92533 transitions. [2023-12-02 13:20:05,165 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2023-12-02 13:20:05,165 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 13:20:05,166 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, 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 13:20:05,171 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2023-12-02 13:20:05,366 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2023-12-02 13:20:05,366 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 13:20:05,367 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 13:20:05,367 INFO L85 PathProgramCache]: Analyzing trace with hash -742130342, now seen corresponding path program 1 times [2023-12-02 13:20:05,367 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 13:20:05,367 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1957545033] [2023-12-02 13:20:05,367 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:20:05,367 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 13:20:05,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:20:05,487 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-12-02 13:20:05,487 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 13:20:05,487 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1957545033] [2023-12-02 13:20:05,487 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1957545033] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 13:20:05,487 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [965504861] [2023-12-02 13:20:05,487 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:20:05,488 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:20:05,488 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 13:20:05,489 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 13:20:05,491 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2023-12-02 13:20:05,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:20:05,722 INFO L262 TraceCheckSpWp]: Trace formula consists of 1084 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 13:20:05,726 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 13:20:05,770 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 35 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-12-02 13:20:05,770 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 13:20:05,771 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [965504861] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 13:20:05,771 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 13:20:05,771 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-12-02 13:20:05,771 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1224506137] [2023-12-02 13:20:05,771 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 13:20:05,771 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 13:20:05,772 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 13:20:05,772 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 13:20:05,772 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 13:20:05,772 INFO L87 Difference]: Start difference. First operand 60580 states and 92533 transitions. Second operand has 3 states, 3 states have (on average 38.0) internal successors, (114), 2 states have internal predecessors, (114), 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 13:20:16,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 13:20:16,147 INFO L93 Difference]: Finished difference Result 179309 states and 281278 transitions. [2023-12-02 13:20:16,147 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 13:20:16,148 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 38.0) internal successors, (114), 2 states have internal predecessors, (114), 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 145 [2023-12-02 13:20:16,148 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 13:20:16,449 INFO L225 Difference]: With dead ends: 179309 [2023-12-02 13:20:16,449 INFO L226 Difference]: Without dead ends: 119464 [2023-12-02 13:20:16,554 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 145 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 13:20:16,554 INFO L413 NwaCegarLoop]: 345 mSDtfsCounter, 361 mSDsluCounter, 263 mSDsCounter, 0 mSdLazyCounter, 120 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 361 SdHoareTripleChecker+Valid, 608 SdHoareTripleChecker+Invalid, 122 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 120 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 13:20:16,555 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [361 Valid, 608 Invalid, 122 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 120 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 13:20:16,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119464 states. [2023-12-02 13:20:26,287 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119464 to 119140. [2023-12-02 13:20:26,342 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119140 states, 102963 states have (on average 1.459844798616979) internal successors, (150310), 103361 states have internal predecessors, (150310), 12218 states have call successors, (12218), 3940 states have call predecessors, (12218), 3957 states have return successors, (18901), 11840 states have call predecessors, (18901), 12215 states have call successors, (18901) [2023-12-02 13:20:26,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119140 states to 119140 states and 181429 transitions. [2023-12-02 13:20:26,677 INFO L78 Accepts]: Start accepts. Automaton has 119140 states and 181429 transitions. Word has length 145 [2023-12-02 13:20:26,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 13:20:26,677 INFO L495 AbstractCegarLoop]: Abstraction has 119140 states and 181429 transitions. [2023-12-02 13:20:26,677 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 38.0) internal successors, (114), 2 states have internal predecessors, (114), 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 13:20:26,677 INFO L276 IsEmpty]: Start isEmpty. Operand 119140 states and 181429 transitions. [2023-12-02 13:20:26,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2023-12-02 13:20:26,754 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 13:20:26,754 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, 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 13:20:26,759 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2023-12-02 13:20:26,954 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2023-12-02 13:20:26,955 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 13:20:26,955 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 13:20:26,955 INFO L85 PathProgramCache]: Analyzing trace with hash 2037670492, now seen corresponding path program 1 times [2023-12-02 13:20:26,955 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 13:20:26,955 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1773871835] [2023-12-02 13:20:26,955 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:20:26,955 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 13:20:26,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:20:27,329 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2023-12-02 13:20:27,329 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 13:20:27,329 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1773871835] [2023-12-02 13:20:27,329 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1773871835] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 13:20:27,330 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 13:20:27,330 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-12-02 13:20:27,330 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [665436626] [2023-12-02 13:20:27,330 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 13:20:27,330 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 13:20:27,330 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 13:20:27,331 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 13:20:27,331 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-12-02 13:20:27,331 INFO L87 Difference]: Start difference. First operand 119140 states and 181429 transitions. Second operand has 6 states, 6 states have (on average 14.0) internal successors, (84), 6 states have internal predecessors, (84), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2023-12-02 13:20:46,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 13:20:46,424 INFO L93 Difference]: Finished difference Result 381228 states and 588091 transitions. [2023-12-02 13:20:46,424 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-12-02 13:20:46,425 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 14.0) internal successors, (84), 6 states have internal predecessors, (84), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 145 [2023-12-02 13:20:46,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 13:20:47,253 INFO L225 Difference]: With dead ends: 381228 [2023-12-02 13:20:47,253 INFO L226 Difference]: Without dead ends: 262824 [2023-12-02 13:20:47,537 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=85, Unknown=0, NotChecked=0, Total=132 [2023-12-02 13:20:47,538 INFO L413 NwaCegarLoop]: 348 mSDtfsCounter, 1028 mSDsluCounter, 812 mSDsCounter, 0 mSdLazyCounter, 570 mSolverCounterSat, 133 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1060 SdHoareTripleChecker+Valid, 1160 SdHoareTripleChecker+Invalid, 703 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 133 IncrementalHoareTripleChecker+Valid, 570 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 13:20:47,538 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1060 Valid, 1160 Invalid, 703 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [133 Valid, 570 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 13:20:47,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 262824 states. [2023-12-02 13:21:07,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 262824 to 233700. [2023-12-02 13:21:07,814 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 233700 states, 202227 states have (on average 1.4553447363606244) internal successors, (294310), 203009 states have internal predecessors, (294310), 23674 states have call successors, (23674), 7780 states have call predecessors, (23674), 7797 states have return successors, (36501), 22912 states have call predecessors, (36501), 23671 states have call successors, (36501) [2023-12-02 13:21:08,804 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 233700 states to 233700 states and 354485 transitions. [2023-12-02 13:21:08,813 INFO L78 Accepts]: Start accepts. Automaton has 233700 states and 354485 transitions. Word has length 145 [2023-12-02 13:21:08,813 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 13:21:08,813 INFO L495 AbstractCegarLoop]: Abstraction has 233700 states and 354485 transitions. [2023-12-02 13:21:08,814 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 14.0) internal successors, (84), 6 states have internal predecessors, (84), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2023-12-02 13:21:08,814 INFO L276 IsEmpty]: Start isEmpty. Operand 233700 states and 354485 transitions. [2023-12-02 13:21:08,953 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2023-12-02 13:21:08,953 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 13:21:08,954 INFO L195 NwaCegarLoop]: trace histogram [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, 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, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 13:21:08,954 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2023-12-02 13:21:08,954 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 13:21:08,954 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 13:21:08,954 INFO L85 PathProgramCache]: Analyzing trace with hash -1678495739, now seen corresponding path program 1 times [2023-12-02 13:21:08,954 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 13:21:08,954 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [988482083] [2023-12-02 13:21:08,954 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:21:08,954 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 13:21:08,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:21:09,346 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 10 proven. 44 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2023-12-02 13:21:09,346 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 13:21:09,346 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [988482083] [2023-12-02 13:21:09,346 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [988482083] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 13:21:09,346 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [148140041] [2023-12-02 13:21:09,346 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:21:09,346 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:21:09,347 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 13:21:09,347 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 13:21:09,352 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2023-12-02 13:21:09,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:21:09,577 INFO L262 TraceCheckSpWp]: Trace formula consists of 1119 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 13:21:09,580 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 13:21:09,603 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 29 proven. 0 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2023-12-02 13:21:09,603 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 13:21:09,603 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [148140041] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 13:21:09,603 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 13:21:09,603 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-12-02 13:21:09,603 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1058266011] [2023-12-02 13:21:09,603 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 13:21:09,604 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 13:21:09,604 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 13:21:09,604 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 13:21:09,604 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 13:21:09,605 INFO L87 Difference]: Start difference. First operand 233700 states and 354485 transitions. Second operand has 3 states, 3 states have (on average 34.333333333333336) internal successors, (103), 3 states have internal predecessors, (103), 3 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2023-12-02 13:21:34,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 13:21:34,549 INFO L93 Difference]: Finished difference Result 475624 states and 736696 transitions. [2023-12-02 13:21:34,549 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 13:21:34,549 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 34.333333333333336) internal successors, (103), 3 states have internal predecessors, (103), 3 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 169 [2023-12-02 13:21:34,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 13:21:35,541 INFO L225 Difference]: With dead ends: 475624 [2023-12-02 13:21:35,541 INFO L226 Difference]: Without dead ends: 288740 [2023-12-02 13:21:35,841 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 171 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 13:21:35,841 INFO L413 NwaCegarLoop]: 499 mSDtfsCounter, 148 mSDsluCounter, 358 mSDsCounter, 0 mSdLazyCounter, 162 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 148 SdHoareTripleChecker+Valid, 857 SdHoareTripleChecker+Invalid, 162 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 162 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 13:21:35,841 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [148 Valid, 857 Invalid, 162 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 162 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 13:21:36,033 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 288740 states. [2023-12-02 13:21:58,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 288740 to 274660. [2023-12-02 13:21:58,886 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 274660 states, 242163 states have (on average 1.480680368181762) internal successors, (358566), 242945 states have internal predecessors, (358566), 24186 states have call successors, (24186), 8292 states have call predecessors, (24186), 8309 states have return successors, (37013), 23424 states have call predecessors, (37013), 24183 states have call successors, (37013) [2023-12-02 13:22:00,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 274660 states to 274660 states and 419765 transitions. [2023-12-02 13:22:00,052 INFO L78 Accepts]: Start accepts. Automaton has 274660 states and 419765 transitions. Word has length 169 [2023-12-02 13:22:00,052 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 13:22:00,052 INFO L495 AbstractCegarLoop]: Abstraction has 274660 states and 419765 transitions. [2023-12-02 13:22:00,053 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 34.333333333333336) internal successors, (103), 3 states have internal predecessors, (103), 3 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2023-12-02 13:22:00,053 INFO L276 IsEmpty]: Start isEmpty. Operand 274660 states and 419765 transitions. [2023-12-02 13:22:00,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 221 [2023-12-02 13:22:00,771 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 13:22:00,771 INFO L195 NwaCegarLoop]: trace histogram [10, 7, 7, 7, 7, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 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, 1, 1, 1, 1, 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 13:22:00,777 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2023-12-02 13:22:00,972 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2023-12-02 13:22:00,972 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 13:22:00,973 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 13:22:00,973 INFO L85 PathProgramCache]: Analyzing trace with hash 2143314802, now seen corresponding path program 1 times [2023-12-02 13:22:00,973 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 13:22:00,973 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [57114513] [2023-12-02 13:22:00,973 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:22:00,973 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 13:22:01,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:22:01,664 INFO L134 CoverageAnalysis]: Checked inductivity of 370 backedges. 115 proven. 55 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2023-12-02 13:22:01,664 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 13:22:01,664 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [57114513] [2023-12-02 13:22:01,664 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [57114513] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 13:22:01,664 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1739385353] [2023-12-02 13:22:01,664 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:22:01,664 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:22:01,664 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 13:22:01,665 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 13:22:01,666 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2023-12-02 13:22:01,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:22:01,836 INFO L262 TraceCheckSpWp]: Trace formula consists of 885 conjuncts, 16 conjunts are in the unsatisfiable core [2023-12-02 13:22:01,842 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 13:22:01,959 INFO L134 CoverageAnalysis]: Checked inductivity of 370 backedges. 258 proven. 0 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2023-12-02 13:22:01,959 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 13:22:01,959 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1739385353] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 13:22:01,960 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 13:22:01,960 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [19] total 26 [2023-12-02 13:22:01,960 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1159939225] [2023-12-02 13:22:01,960 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 13:22:01,960 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-12-02 13:22:01,961 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 13:22:01,961 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-12-02 13:22:01,961 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=585, Unknown=0, NotChecked=0, Total=650 [2023-12-02 13:22:01,961 INFO L87 Difference]: Start difference. First operand 274660 states and 419765 transitions. Second operand has 9 states, 7 states have (on average 14.428571428571429) internal successors, (101), 7 states have internal predecessors, (101), 3 states have call successors, (22), 3 states have call predecessors, (22), 5 states have return successors, (22), 5 states have call predecessors, (22), 3 states have call successors, (22) [2023-12-02 13:22:22,445 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 13:22:22,445 INFO L93 Difference]: Finished difference Result 274907 states and 420037 transitions. [2023-12-02 13:22:22,446 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-12-02 13:22:22,446 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 7 states have (on average 14.428571428571429) internal successors, (101), 7 states have internal predecessors, (101), 3 states have call successors, (22), 3 states have call predecessors, (22), 5 states have return successors, (22), 5 states have call predecessors, (22), 3 states have call successors, (22) Word has length 220 [2023-12-02 13:22:22,446 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 13:22:23,314 INFO L225 Difference]: With dead ends: 274907 [2023-12-02 13:22:23,314 INFO L226 Difference]: Without dead ends: 273931 [2023-12-02 13:22:23,381 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 217 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=88, Invalid=782, Unknown=0, NotChecked=0, Total=870 [2023-12-02 13:22:23,381 INFO L413 NwaCegarLoop]: 378 mSDtfsCounter, 370 mSDsluCounter, 2170 mSDsCounter, 0 mSdLazyCounter, 597 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 372 SdHoareTripleChecker+Valid, 2548 SdHoareTripleChecker+Invalid, 601 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 597 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-12-02 13:22:23,382 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [372 Valid, 2548 Invalid, 601 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 597 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-12-02 13:22:23,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 273931 states. [2023-12-02 13:22:45,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 273931 to 273931. [2023-12-02 13:22:45,558 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 273931 states, 241668 states have (on average 1.481453895426784) internal successors, (358020), 242438 states have internal predecessors, (358020), 24070 states have call successors, (24070), 8193 states have call predecessors, (24070), 8192 states have return successors, (36868), 23300 states have call predecessors, (36868), 24068 states have call successors, (36868) [2023-12-02 13:22:46,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 273931 states to 273931 states and 418958 transitions. [2023-12-02 13:22:46,847 INFO L78 Accepts]: Start accepts. Automaton has 273931 states and 418958 transitions. Word has length 220 [2023-12-02 13:22:46,847 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 13:22:46,847 INFO L495 AbstractCegarLoop]: Abstraction has 273931 states and 418958 transitions. [2023-12-02 13:22:46,847 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 7 states have (on average 14.428571428571429) internal successors, (101), 7 states have internal predecessors, (101), 3 states have call successors, (22), 3 states have call predecessors, (22), 5 states have return successors, (22), 5 states have call predecessors, (22), 3 states have call successors, (22) [2023-12-02 13:22:46,848 INFO L276 IsEmpty]: Start isEmpty. Operand 273931 states and 418958 transitions. [2023-12-02 13:22:47,221 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 224 [2023-12-02 13:22:47,221 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 13:22:47,222 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, 3, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 13:22:47,227 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2023-12-02 13:22:47,422 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:22:47,422 INFO L420 AbstractCegarLoop]: === Iteration 31 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 13:22:47,423 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 13:22:47,423 INFO L85 PathProgramCache]: Analyzing trace with hash 212282892, now seen corresponding path program 1 times [2023-12-02 13:22:47,423 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 13:22:47,423 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1101380893] [2023-12-02 13:22:47,423 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:22:47,423 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 13:22:47,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:22:47,940 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 10 proven. 87 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2023-12-02 13:22:47,941 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 13:22:47,941 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1101380893] [2023-12-02 13:22:47,941 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1101380893] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 13:22:47,941 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1251247501] [2023-12-02 13:22:47,941 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:22:47,941 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:22:47,941 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 13:22:47,942 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 13:22:47,952 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2023-12-02 13:22:48,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:22:48,190 INFO L262 TraceCheckSpWp]: Trace formula consists of 1400 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 13:22:48,193 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 13:22:48,339 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 106 proven. 0 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2023-12-02 13:22:48,339 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 13:22:48,339 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1251247501] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 13:22:48,339 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 13:22:48,340 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [6] total 7 [2023-12-02 13:22:48,340 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [122306067] [2023-12-02 13:22:48,340 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 13:22:48,340 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 13:22:48,340 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 13:22:48,340 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 13:22:48,341 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 13:22:48,341 INFO L87 Difference]: Start difference. First operand 273931 states and 418958 transitions. Second operand has 3 states, 3 states have (on average 47.666666666666664) internal successors, (143), 2 states have internal predecessors, (143), 2 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2023-12-02 13:23:30,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 13:23:30,607 INFO L93 Difference]: Finished difference Result 817940 states and 1275799 transitions. [2023-12-02 13:23:30,608 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 13:23:30,608 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 47.666666666666664) internal successors, (143), 2 states have internal predecessors, (143), 2 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) Word has length 223 [2023-12-02 13:23:30,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 13:23:32,298 INFO L225 Difference]: With dead ends: 817940 [2023-12-02 13:23:32,298 INFO L226 Difference]: Without dead ends: 544015 [2023-12-02 13:23:33,136 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 230 GetRequests, 225 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 13:23:33,137 INFO L413 NwaCegarLoop]: 272 mSDtfsCounter, 221 mSDsluCounter, 263 mSDsCounter, 0 mSdLazyCounter, 107 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 221 SdHoareTripleChecker+Valid, 535 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 13:23:33,137 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [221 Valid, 535 Invalid, 109 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 107 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 13:23:33,488 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 544015 states. [2023-12-02 13:24:18,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 544015 to 542219. [2023-12-02 13:24:18,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 542219 states, 478980 states have (on average 1.476746419474717) internal successors, (707332), 480518 states have internal predecessors, (707332), 46854 states have call successors, (46854), 16385 states have call predecessors, (46854), 16384 states have return successors, (71428), 45316 states have call predecessors, (71428), 46852 states have call successors, (71428) [2023-12-02 13:24:21,214 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 542219 states to 542219 states and 825614 transitions. [2023-12-02 13:24:21,230 INFO L78 Accepts]: Start accepts. Automaton has 542219 states and 825614 transitions. Word has length 223 [2023-12-02 13:24:21,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 13:24:21,231 INFO L495 AbstractCegarLoop]: Abstraction has 542219 states and 825614 transitions. [2023-12-02 13:24:21,231 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 47.666666666666664) internal successors, (143), 2 states have internal predecessors, (143), 2 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2023-12-02 13:24:21,231 INFO L276 IsEmpty]: Start isEmpty. Operand 542219 states and 825614 transitions. [2023-12-02 13:24:22,268 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 224 [2023-12-02 13:24:22,268 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 13:24:22,268 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, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 13:24:22,274 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2023-12-02 13:24:22,468 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:24:22,469 INFO L420 AbstractCegarLoop]: === Iteration 32 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 13:24:22,469 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 13:24:22,469 INFO L85 PathProgramCache]: Analyzing trace with hash -1890173584, now seen corresponding path program 1 times [2023-12-02 13:24:22,469 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 13:24:22,469 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1157214318] [2023-12-02 13:24:22,469 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:24:22,470 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 13:24:22,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:24:22,724 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 10 proven. 87 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2023-12-02 13:24:22,724 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 13:24:22,724 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1157214318] [2023-12-02 13:24:22,724 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1157214318] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 13:24:22,724 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1932723771] [2023-12-02 13:24:22,725 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:24:22,725 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:24:22,725 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 13:24:22,726 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 13:24:22,726 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8af9e930-3f4c-4289-bae2-25038bb02c18/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2023-12-02 13:24:22,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:24:22,995 INFO L262 TraceCheckSpWp]: Trace formula consists of 1400 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 13:24:22,998 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 13:24:23,126 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 109 proven. 0 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2023-12-02 13:24:23,126 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 13:24:23,126 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1932723771] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 13:24:23,126 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 13:24:23,126 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [6] total 7 [2023-12-02 13:24:23,126 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1635017042] [2023-12-02 13:24:23,126 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 13:24:23,127 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 13:24:23,127 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 13:24:23,127 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 13:24:23,128 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 13:24:23,128 INFO L87 Difference]: Start difference. First operand 542219 states and 825614 transitions. Second operand has 3 states, 3 states have (on average 48.666666666666664) internal successors, (146), 2 states have internal predecessors, (146), 2 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2023-12-02 13:25:49,272 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 13:25:49,273 INFO L93 Difference]: Finished difference Result 1618964 states and 2512407 transitions. [2023-12-02 13:25:49,273 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 13:25:49,273 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 48.666666666666664) internal successors, (146), 2 states have internal predecessors, (146), 2 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) Word has length 223 [2023-12-02 13:25:49,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 13:25:53,144 INFO L225 Difference]: With dead ends: 1618964 [2023-12-02 13:25:53,145 INFO L226 Difference]: Without dead ends: 1076751 [2023-12-02 13:25:54,643 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 230 GetRequests, 225 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 13:25:54,644 INFO L413 NwaCegarLoop]: 272 mSDtfsCounter, 221 mSDsluCounter, 263 mSDsCounter, 0 mSdLazyCounter, 107 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 221 SdHoareTripleChecker+Valid, 535 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 13:25:54,644 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [221 Valid, 535 Invalid, 109 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 107 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 13:25:55,368 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1076751 states.