./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/pc_sfifo_2.cil-1+token_ring.12.cil-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 0e0057cc Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/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_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/pc_sfifo_2.cil-1+token_ring.12.cil-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/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_bccc5800-1022-42ad-99f0-c43e332c0b7e/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 a41d14195dc7825ea8ff849a910a7045aa33d6087daf5af287d6c34e44b1032a --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-12-02 18:46:24,725 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-12-02 18:46:24,788 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-12-02 18:46:24,794 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-12-02 18:46:24,794 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-12-02 18:46:24,818 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-12-02 18:46:24,818 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-12-02 18:46:24,819 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-12-02 18:46:24,820 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-12-02 18:46:24,820 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-12-02 18:46:24,821 INFO L153 SettingsManager]: * User list type=DISABLED [2023-12-02 18:46:24,821 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-12-02 18:46:24,822 INFO L153 SettingsManager]: * Explicit value domain=true [2023-12-02 18:46:24,822 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-12-02 18:46:24,823 INFO L153 SettingsManager]: * Octagon Domain=false [2023-12-02 18:46:24,823 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-12-02 18:46:24,824 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-12-02 18:46:24,824 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-12-02 18:46:24,825 INFO L153 SettingsManager]: * Interval Domain=false [2023-12-02 18:46:24,825 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-12-02 18:46:24,826 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-12-02 18:46:24,826 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-12-02 18:46:24,827 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-12-02 18:46:24,828 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-12-02 18:46:24,828 INFO L153 SettingsManager]: * sizeof long=4 [2023-12-02 18:46:24,828 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-12-02 18:46:24,829 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-12-02 18:46:24,829 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-12-02 18:46:24,830 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-12-02 18:46:24,830 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-12-02 18:46:24,831 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-12-02 18:46:24,831 INFO L153 SettingsManager]: * sizeof long double=12 [2023-12-02 18:46:24,831 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-12-02 18:46:24,831 INFO L153 SettingsManager]: * Use constant arrays=true [2023-12-02 18:46:24,832 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-12-02 18:46:24,832 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-12-02 18:46:24,832 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-12-02 18:46:24,832 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 18:46:24,833 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-12-02 18:46:24,833 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-12-02 18:46:24,833 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-12-02 18:46:24,833 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-12-02 18:46:24,833 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-12-02 18:46:24,834 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-12-02 18:46:24,834 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-12-02 18:46:24,834 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-12-02 18:46:24,834 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-12-02 18:46:24,834 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_bccc5800-1022-42ad-99f0-c43e332c0b7e/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> a41d14195dc7825ea8ff849a910a7045aa33d6087daf5af287d6c34e44b1032a [2023-12-02 18:46:25,059 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-12-02 18:46:25,078 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-12-02 18:46:25,080 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-12-02 18:46:25,082 INFO L270 PluginConnector]: Initializing CDTParser... [2023-12-02 18:46:25,082 INFO L274 PluginConnector]: CDTParser initialized [2023-12-02 18:46:25,083 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/../../sv-benchmarks/c/combinations/pc_sfifo_2.cil-1+token_ring.12.cil-1.c [2023-12-02 18:46:27,808 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-12-02 18:46:28,039 INFO L384 CDTParser]: Found 1 translation units. [2023-12-02 18:46:28,039 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/sv-benchmarks/c/combinations/pc_sfifo_2.cil-1+token_ring.12.cil-1.c [2023-12-02 18:46:28,061 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/data/369b3d603/693116bf2fb64a65b22683994062693e/FLAG6767075af [2023-12-02 18:46:28,073 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/data/369b3d603/693116bf2fb64a65b22683994062693e [2023-12-02 18:46:28,075 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-12-02 18:46:28,077 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-12-02 18:46:28,078 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-12-02 18:46:28,078 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-12-02 18:46:28,083 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-12-02 18:46:28,084 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 06:46:28" (1/1) ... [2023-12-02 18:46:28,085 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@663855a2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 06:46:28, skipping insertion in model container [2023-12-02 18:46:28,085 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 06:46:28" (1/1) ... [2023-12-02 18:46:28,146 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-12-02 18:46:28,277 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_bccc5800-1022-42ad-99f0-c43e332c0b7e/sv-benchmarks/c/combinations/pc_sfifo_2.cil-1+token_ring.12.cil-1.c[914,927] [2023-12-02 18:46:28,328 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_bccc5800-1022-42ad-99f0-c43e332c0b7e/sv-benchmarks/c/combinations/pc_sfifo_2.cil-1+token_ring.12.cil-1.c[7115,7128] [2023-12-02 18:46:28,432 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 18:46:28,446 INFO L202 MainTranslator]: Completed pre-run [2023-12-02 18:46:28,455 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_bccc5800-1022-42ad-99f0-c43e332c0b7e/sv-benchmarks/c/combinations/pc_sfifo_2.cil-1+token_ring.12.cil-1.c[914,927] [2023-12-02 18:46:28,472 WARN L240 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/sv-benchmarks/c/combinations/pc_sfifo_2.cil-1+token_ring.12.cil-1.c[7115,7128] [2023-12-02 18:46:28,525 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 18:46:28,547 INFO L206 MainTranslator]: Completed translation [2023-12-02 18:46:28,548 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 06:46:28 WrapperNode [2023-12-02 18:46:28,548 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-12-02 18:46:28,548 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-12-02 18:46:28,549 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-12-02 18:46:28,549 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-12-02 18:46:28,554 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 06:46:28" (1/1) ... [2023-12-02 18:46:28,570 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 06:46:28" (1/1) ... [2023-12-02 18:46:28,618 INFO L138 Inliner]: procedures = 77, calls = 94, calls flagged for inlining = 45, calls inlined = 45, statements flattened = 1076 [2023-12-02 18:46:28,618 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-12-02 18:46:28,619 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-12-02 18:46:28,619 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-12-02 18:46:28,619 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-12-02 18:46:28,628 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 06:46:28" (1/1) ... [2023-12-02 18:46:28,628 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 06:46:28" (1/1) ... [2023-12-02 18:46:28,635 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 06:46:28" (1/1) ... [2023-12-02 18:46:28,635 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 06:46:28" (1/1) ... [2023-12-02 18:46:28,657 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 06:46:28" (1/1) ... [2023-12-02 18:46:28,674 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 06:46:28" (1/1) ... [2023-12-02 18:46:28,678 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 06:46:28" (1/1) ... [2023-12-02 18:46:28,683 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 06:46:28" (1/1) ... [2023-12-02 18:46:28,692 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-12-02 18:46:28,693 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-12-02 18:46:28,693 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-12-02 18:46:28,693 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-12-02 18:46:28,694 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 06:46:28" (1/1) ... [2023-12-02 18:46:28,704 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 18:46:28,714 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 18:46:28,730 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-12-02 18:46:28,732 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-12-02 18:46:28,761 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-12-02 18:46:28,762 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2023-12-02 18:46:28,762 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2023-12-02 18:46:28,762 INFO L130 BoogieDeclarations]: Found specification of procedure is_do_write_p_triggered [2023-12-02 18:46:28,762 INFO L138 BoogieDeclarations]: Found implementation of procedure is_do_write_p_triggered [2023-12-02 18:46:28,762 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread1 [2023-12-02 18:46:28,763 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread1 [2023-12-02 18:46:28,763 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread2 [2023-12-02 18:46:28,763 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread2 [2023-12-02 18:46:28,763 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events1 [2023-12-02 18:46:28,763 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events1 [2023-12-02 18:46:28,763 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events2 [2023-12-02 18:46:28,764 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events2 [2023-12-02 18:46:28,764 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads2 [2023-12-02 18:46:28,764 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads2 [2023-12-02 18:46:28,764 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads1 [2023-12-02 18:46:28,764 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads1 [2023-12-02 18:46:28,765 INFO L130 BoogieDeclarations]: Found specification of procedure is_do_read_c_triggered [2023-12-02 18:46:28,765 INFO L138 BoogieDeclarations]: Found implementation of procedure is_do_read_c_triggered [2023-12-02 18:46:28,765 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels1 [2023-12-02 18:46:28,765 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels1 [2023-12-02 18:46:28,765 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels2 [2023-12-02 18:46:28,765 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels2 [2023-12-02 18:46:28,766 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-12-02 18:46:28,766 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events2 [2023-12-02 18:46:28,766 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events2 [2023-12-02 18:46:28,766 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events1 [2023-12-02 18:46:28,766 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events1 [2023-12-02 18:46:28,766 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-12-02 18:46:28,767 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-12-02 18:46:28,767 INFO L130 BoogieDeclarations]: Found specification of procedure error1 [2023-12-02 18:46:28,767 INFO L138 BoogieDeclarations]: Found implementation of procedure error1 [2023-12-02 18:46:28,767 INFO L130 BoogieDeclarations]: Found specification of procedure error2 [2023-12-02 18:46:28,767 INFO L138 BoogieDeclarations]: Found implementation of procedure error2 [2023-12-02 18:46:28,888 INFO L241 CfgBuilder]: Building ICFG [2023-12-02 18:46:28,890 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-12-02 18:46:29,702 INFO L282 CfgBuilder]: Performing block encoding [2023-12-02 18:46:30,209 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-12-02 18:46:30,209 INFO L309 CfgBuilder]: Removed 19 assume(true) statements. [2023-12-02 18:46:30,211 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 06:46:30 BoogieIcfgContainer [2023-12-02 18:46:30,211 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-12-02 18:46:30,213 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-12-02 18:46:30,213 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-12-02 18:46:30,216 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-12-02 18:46:30,217 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.12 06:46:28" (1/3) ... [2023-12-02 18:46:30,217 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3ac329a1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 06:46:30, skipping insertion in model container [2023-12-02 18:46:30,217 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 06:46:28" (2/3) ... [2023-12-02 18:46:30,218 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3ac329a1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 06:46:30, skipping insertion in model container [2023-12-02 18:46:30,218 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 06:46:30" (3/3) ... [2023-12-02 18:46:30,219 INFO L112 eAbstractionObserver]: Analyzing ICFG pc_sfifo_2.cil-1+token_ring.12.cil-1.c [2023-12-02 18:46:30,238 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-12-02 18:46:30,238 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2023-12-02 18:46:30,294 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-12-02 18:46:30,300 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;@7bffecf7, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-12-02 18:46:30,301 INFO L358 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2023-12-02 18:46:30,306 INFO L276 IsEmpty]: Start isEmpty. Operand has 279 states, 219 states have (on average 1.5159817351598173) internal successors, (332), 227 states have internal predecessors, (332), 42 states have call successors, (42), 15 states have call predecessors, (42), 15 states have return successors, (42), 40 states have call predecessors, (42), 42 states have call successors, (42) [2023-12-02 18:46:30,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2023-12-02 18:46:30,317 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:46:30,318 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 18:46:30,318 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 18:46:30,322 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:46:30,323 INFO L85 PathProgramCache]: Analyzing trace with hash 1778176549, now seen corresponding path program 1 times [2023-12-02 18:46:30,332 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:46:30,333 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [359758053] [2023-12-02 18:46:30,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:46:30,333 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:46:30,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:46:30,655 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 18:46:30,655 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:46:30,656 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [359758053] [2023-12-02 18:46:30,656 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [359758053] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 18:46:30,657 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 18:46:30,657 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-12-02 18:46:30,658 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2056716587] [2023-12-02 18:46:30,658 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 18:46:30,662 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 18:46:30,662 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:46:30,685 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 18:46:30,685 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 18:46:30,688 INFO L87 Difference]: Start difference. First operand has 279 states, 219 states have (on average 1.5159817351598173) internal successors, (332), 227 states have internal predecessors, (332), 42 states have call successors, (42), 15 states have call predecessors, (42), 15 states have return successors, (42), 40 states have call predecessors, (42), 42 states have call successors, (42) 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 18:46:31,719 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:46:31,719 INFO L93 Difference]: Finished difference Result 977 states and 1430 transitions. [2023-12-02 18:46:31,720 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-12-02 18:46:31,722 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 18:46:31,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:46:31,739 INFO L225 Difference]: With dead ends: 977 [2023-12-02 18:46:31,739 INFO L226 Difference]: Without dead ends: 684 [2023-12-02 18:46:31,745 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2023-12-02 18:46:31,748 INFO L413 NwaCegarLoop]: 456 mSDtfsCounter, 1106 mSDsluCounter, 743 mSDsCounter, 0 mSdLazyCounter, 696 mSolverCounterSat, 332 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1113 SdHoareTripleChecker+Valid, 1199 SdHoareTripleChecker+Invalid, 1028 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 332 IncrementalHoareTripleChecker+Valid, 696 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2023-12-02 18:46:31,749 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1113 Valid, 1199 Invalid, 1028 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [332 Valid, 696 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2023-12-02 18:46:31,767 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 684 states. [2023-12-02 18:46:31,843 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 684 to 613. [2023-12-02 18:46:31,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 613 states, 453 states have (on average 1.3620309050772628) internal successors, (617), 458 states have internal predecessors, (617), 97 states have call successors, (97), 63 states have call predecessors, (97), 61 states have return successors, (108), 93 states have call predecessors, (108), 93 states have call successors, (108) [2023-12-02 18:46:31,851 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 613 states to 613 states and 822 transitions. [2023-12-02 18:46:31,853 INFO L78 Accepts]: Start accepts. Automaton has 613 states and 822 transitions. Word has length 45 [2023-12-02 18:46:31,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:46:31,853 INFO L495 AbstractCegarLoop]: Abstraction has 613 states and 822 transitions. [2023-12-02 18:46:31,853 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 18:46:31,854 INFO L276 IsEmpty]: Start isEmpty. Operand 613 states and 822 transitions. [2023-12-02 18:46:31,856 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2023-12-02 18:46:31,856 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:46:31,857 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 18:46:31,857 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-12-02 18:46:31,857 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 18:46:31,858 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:46:31,858 INFO L85 PathProgramCache]: Analyzing trace with hash 1390309283, now seen corresponding path program 1 times [2023-12-02 18:46:31,858 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:46:31,858 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1956090040] [2023-12-02 18:46:31,858 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:46:31,859 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:46:31,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:46:32,087 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 18:46:32,087 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:46:32,087 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1956090040] [2023-12-02 18:46:32,087 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1956090040] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 18:46:32,087 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 18:46:32,088 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2023-12-02 18:46:32,088 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1505014954] [2023-12-02 18:46:32,088 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 18:46:32,089 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-12-02 18:46:32,089 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:46:32,090 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-12-02 18:46:32,090 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2023-12-02 18:46:32,091 INFO L87 Difference]: Start difference. First operand 613 states and 822 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 18:46:33,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:46:33,045 INFO L93 Difference]: Finished difference Result 1374 states and 1769 transitions. [2023-12-02 18:46:33,045 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-12-02 18:46:33,045 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 18:46:33,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:46:33,054 INFO L225 Difference]: With dead ends: 1374 [2023-12-02 18:46:33,055 INFO L226 Difference]: Without dead ends: 971 [2023-12-02 18:46:33,056 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=90, Invalid=216, Unknown=0, NotChecked=0, Total=306 [2023-12-02 18:46:33,058 INFO L413 NwaCegarLoop]: 226 mSDtfsCounter, 563 mSDsluCounter, 821 mSDsCounter, 0 mSdLazyCounter, 1016 mSolverCounterSat, 101 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 595 SdHoareTripleChecker+Valid, 1047 SdHoareTripleChecker+Invalid, 1117 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 101 IncrementalHoareTripleChecker+Valid, 1016 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-12-02 18:46:33,059 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [595 Valid, 1047 Invalid, 1117 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [101 Valid, 1016 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-12-02 18:46:33,061 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 971 states. [2023-12-02 18:46:33,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 971 to 942. [2023-12-02 18:46:33,118 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 942 states, 676 states have (on average 1.3136094674556213) internal successors, (888), 682 states have internal predecessors, (888), 153 states have call successors, (153), 111 states have call predecessors, (153), 111 states have return successors, (182), 150 states have call predecessors, (182), 149 states have call successors, (182) [2023-12-02 18:46:33,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 942 states to 942 states and 1223 transitions. [2023-12-02 18:46:33,123 INFO L78 Accepts]: Start accepts. Automaton has 942 states and 1223 transitions. Word has length 46 [2023-12-02 18:46:33,124 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:46:33,124 INFO L495 AbstractCegarLoop]: Abstraction has 942 states and 1223 transitions. [2023-12-02 18:46:33,124 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 18:46:33,124 INFO L276 IsEmpty]: Start isEmpty. Operand 942 states and 1223 transitions. [2023-12-02 18:46:33,126 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2023-12-02 18:46:33,126 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:46:33,127 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 18:46:33,127 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-12-02 18:46:33,127 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 18:46:33,128 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:46:33,128 INFO L85 PathProgramCache]: Analyzing trace with hash 832406675, now seen corresponding path program 1 times [2023-12-02 18:46:33,128 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:46:33,128 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [351906108] [2023-12-02 18:46:33,129 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:46:33,129 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:46:33,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:46:33,204 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 18:46:33,204 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:46:33,204 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [351906108] [2023-12-02 18:46:33,204 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [351906108] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 18:46:33,205 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 18:46:33,205 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 18:46:33,205 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1011112970] [2023-12-02 18:46:33,205 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 18:46:33,206 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 18:46:33,206 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:46:33,206 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 18:46:33,207 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 18:46:33,207 INFO L87 Difference]: Start difference. First operand 942 states and 1223 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 18:46:33,396 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:46:33,397 INFO L93 Difference]: Finished difference Result 1883 states and 2382 transitions. [2023-12-02 18:46:33,397 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 18:46:33,397 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 18:46:33,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:46:33,405 INFO L225 Difference]: With dead ends: 1883 [2023-12-02 18:46:33,405 INFO L226 Difference]: Without dead ends: 1201 [2023-12-02 18:46:33,407 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 18:46:33,408 INFO L413 NwaCegarLoop]: 342 mSDtfsCounter, 68 mSDsluCounter, 314 mSDsCounter, 0 mSdLazyCounter, 130 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 656 SdHoareTripleChecker+Invalid, 133 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 130 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 18:46:33,409 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [68 Valid, 656 Invalid, 133 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 130 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 18:46:33,411 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1201 states. [2023-12-02 18:46:33,465 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1201 to 1179. [2023-12-02 18:46:33,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1179 states, 837 states have (on average 1.2927120669056154) internal successors, (1082), 843 states have internal predecessors, (1082), 195 states have call successors, (195), 149 states have call predecessors, (195), 145 states have return successors, (228), 188 states have call predecessors, (228), 191 states have call successors, (228) [2023-12-02 18:46:33,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1179 states to 1179 states and 1505 transitions. [2023-12-02 18:46:33,472 INFO L78 Accepts]: Start accepts. Automaton has 1179 states and 1505 transitions. Word has length 47 [2023-12-02 18:46:33,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:46:33,472 INFO L495 AbstractCegarLoop]: Abstraction has 1179 states and 1505 transitions. [2023-12-02 18:46:33,473 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 18:46:33,473 INFO L276 IsEmpty]: Start isEmpty. Operand 1179 states and 1505 transitions. [2023-12-02 18:46:33,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2023-12-02 18:46:33,475 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:46:33,475 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 18:46:33,476 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-12-02 18:46:33,476 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 18:46:33,476 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:46:33,477 INFO L85 PathProgramCache]: Analyzing trace with hash 448633992, now seen corresponding path program 1 times [2023-12-02 18:46:33,477 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:46:33,477 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [152566036] [2023-12-02 18:46:33,477 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:46:33,477 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:46:33,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:46:33,531 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 18:46:33,531 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:46:33,532 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [152566036] [2023-12-02 18:46:33,532 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [152566036] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 18:46:33,532 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 18:46:33,532 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 18:46:33,532 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1620472936] [2023-12-02 18:46:33,533 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 18:46:33,533 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 18:46:33,533 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:46:33,534 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 18:46:33,534 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 18:46:33,534 INFO L87 Difference]: Start difference. First operand 1179 states and 1505 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 18:46:33,707 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:46:33,707 INFO L93 Difference]: Finished difference Result 1585 states and 1995 transitions. [2023-12-02 18:46:33,707 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 18:46:33,707 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 18:46:33,708 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:46:33,714 INFO L225 Difference]: With dead ends: 1585 [2023-12-02 18:46:33,715 INFO L226 Difference]: Without dead ends: 1030 [2023-12-02 18:46:33,716 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 18:46:33,717 INFO L413 NwaCegarLoop]: 343 mSDtfsCounter, 368 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 78 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 368 SdHoareTripleChecker+Valid, 405 SdHoareTripleChecker+Invalid, 80 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 78 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 18:46:33,718 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [368 Valid, 405 Invalid, 80 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 78 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 18:46:33,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1030 states. [2023-12-02 18:46:33,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1030 to 824. [2023-12-02 18:46:33,776 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 824 states, 601 states have (on average 1.2961730449251248) internal successors, (779), 606 states have internal predecessors, (779), 132 states have call successors, (132), 95 states have call predecessors, (132), 89 states have return successors, (136), 124 states have call predecessors, (136), 128 states have call successors, (136) [2023-12-02 18:46:33,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 824 states to 824 states and 1047 transitions. [2023-12-02 18:46:33,782 INFO L78 Accepts]: Start accepts. Automaton has 824 states and 1047 transitions. Word has length 53 [2023-12-02 18:46:33,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:46:33,783 INFO L495 AbstractCegarLoop]: Abstraction has 824 states and 1047 transitions. [2023-12-02 18:46:33,783 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 18:46:33,783 INFO L276 IsEmpty]: Start isEmpty. Operand 824 states and 1047 transitions. [2023-12-02 18:46:33,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2023-12-02 18:46:33,784 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:46:33,785 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 18:46:33,785 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-12-02 18:46:33,785 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 18:46:33,785 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:46:33,785 INFO L85 PathProgramCache]: Analyzing trace with hash -1809588799, now seen corresponding path program 1 times [2023-12-02 18:46:33,786 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:46:33,786 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [715851943] [2023-12-02 18:46:33,786 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:46:33,786 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:46:33,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:46:33,861 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 18:46:33,861 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:46:33,862 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [715851943] [2023-12-02 18:46:33,862 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [715851943] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 18:46:33,862 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 18:46:33,862 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-12-02 18:46:33,862 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1635960407] [2023-12-02 18:46:33,862 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 18:46:33,863 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 18:46:33,863 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:46:33,864 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 18:46:33,864 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 18:46:33,864 INFO L87 Difference]: Start difference. First operand 824 states and 1047 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 18:46:34,212 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:46:34,212 INFO L93 Difference]: Finished difference Result 1079 states and 1348 transitions. [2023-12-02 18:46:34,213 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 18:46:34,213 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 18:46:34,214 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:46:34,219 INFO L225 Difference]: With dead ends: 1079 [2023-12-02 18:46:34,219 INFO L226 Difference]: Without dead ends: 1076 [2023-12-02 18:46:34,220 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 18:46:34,221 INFO L413 NwaCegarLoop]: 338 mSDtfsCounter, 671 mSDsluCounter, 43 mSDsCounter, 0 mSdLazyCounter, 94 mSolverCounterSat, 159 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 671 SdHoareTripleChecker+Valid, 381 SdHoareTripleChecker+Invalid, 253 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 159 IncrementalHoareTripleChecker+Valid, 94 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 18:46:34,222 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [671 Valid, 381 Invalid, 253 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [159 Valid, 94 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 18:46:34,224 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1076 states. [2023-12-02 18:46:34,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1076 to 823. [2023-12-02 18:46:34,293 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 823 states, 601 states have (on average 1.286189683860233) internal successors, (773), 605 states have internal predecessors, (773), 131 states have call successors, (131), 95 states have call predecessors, (131), 89 states have return successors, (136), 124 states have call predecessors, (136), 128 states have call successors, (136) [2023-12-02 18:46:34,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 823 states to 823 states and 1040 transitions. [2023-12-02 18:46:34,297 INFO L78 Accepts]: Start accepts. Automaton has 823 states and 1040 transitions. Word has length 54 [2023-12-02 18:46:34,297 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:46:34,297 INFO L495 AbstractCegarLoop]: Abstraction has 823 states and 1040 transitions. [2023-12-02 18:46:34,298 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 18:46:34,298 INFO L276 IsEmpty]: Start isEmpty. Operand 823 states and 1040 transitions. [2023-12-02 18:46:34,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2023-12-02 18:46:34,299 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:46:34,299 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 18:46:34,299 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-12-02 18:46:34,300 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 18:46:34,300 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:46:34,300 INFO L85 PathProgramCache]: Analyzing trace with hash -264151940, now seen corresponding path program 1 times [2023-12-02 18:46:34,300 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:46:34,300 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [952297994] [2023-12-02 18:46:34,301 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:46:34,301 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:46:34,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:46:34,415 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 18:46:34,415 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:46:34,415 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [952297994] [2023-12-02 18:46:34,415 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [952297994] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 18:46:34,416 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [875670759] [2023-12-02 18:46:34,416 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:46:34,416 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:46:34,416 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 18:46:34,420 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 18:46:34,436 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-12-02 18:46:34,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:46:34,566 INFO L262 TraceCheckSpWp]: Trace formula consists of 373 conjuncts, 9 conjunts are in the unsatisfiable core [2023-12-02 18:46:34,572 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 18:46:34,782 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 18:46:34,782 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 18:46:34,870 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 18:46:34,870 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [875670759] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 18:46:34,871 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [276389957] [2023-12-02 18:46:34,890 INFO L159 IcfgInterpreter]: Started Sifa with 54 locations of interest [2023-12-02 18:46:34,890 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 18:46:34,893 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 18:46:34,897 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 18:46:34,898 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 18:46:41,615 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events1 with input of size 211 for LOIs [2023-12-02 18:46:41,728 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread1 with input of size 207 for LOIs [2023-12-02 18:46:41,827 INFO L197 IcfgInterpreter]: Interpreting procedure activate_threads1 with input of size 215 for LOIs [2023-12-02 18:46:43,278 INFO L197 IcfgInterpreter]: Interpreting procedure is_do_write_p_triggered with input of size 211 for LOIs [2023-12-02 18:46:43,575 INFO L197 IcfgInterpreter]: Interpreting procedure is_do_read_c_triggered with input of size 211 for LOIs [2023-12-02 18:46:43,879 INFO L197 IcfgInterpreter]: Interpreting procedure fire_delta_events1 with input of size 211 for LOIs [2023-12-02 18:46:43,976 INFO L197 IcfgInterpreter]: Interpreting procedure update_channels1 with input of size 218 for LOIs [2023-12-02 18:46:44,078 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 18:47:10,334 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [276389957] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 18:47:10,335 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2023-12-02 18:47:10,335 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [5, 5, 4] total 41 [2023-12-02 18:47:10,335 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1749285581] [2023-12-02 18:47:10,335 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 18:47:10,336 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2023-12-02 18:47:10,336 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:47:10,337 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2023-12-02 18:47:10,337 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=1447, Unknown=0, NotChecked=0, Total=1640 [2023-12-02 18:47:10,338 INFO L87 Difference]: Start difference. First operand 823 states and 1040 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 18:47:46,642 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:47:46,643 INFO L93 Difference]: Finished difference Result 1484 states and 1814 transitions. [2023-12-02 18:47:46,643 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2023-12-02 18:47:46,643 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 18:47:46,644 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:47:46,648 INFO L225 Difference]: With dead ends: 1484 [2023-12-02 18:47:46,648 INFO L226 Difference]: Without dead ends: 871 [2023-12-02 18:47:46,651 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 126 SyntacticMatches, 3 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1430 ImplicationChecksByTransitivity, 49.1s TimeCoverageRelationStatistics Valid=601, Invalid=4091, Unknown=0, NotChecked=0, Total=4692 [2023-12-02 18:47:46,652 INFO L413 NwaCegarLoop]: 310 mSDtfsCounter, 179 mSDsluCounter, 2659 mSDsCounter, 0 mSdLazyCounter, 6509 mSolverCounterSat, 148 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 12.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 181 SdHoareTripleChecker+Valid, 2969 SdHoareTripleChecker+Invalid, 6657 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 148 IncrementalHoareTripleChecker+Valid, 6509 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 13.2s IncrementalHoareTripleChecker+Time [2023-12-02 18:47:46,652 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [181 Valid, 2969 Invalid, 6657 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [148 Valid, 6509 Invalid, 0 Unknown, 0 Unchecked, 13.2s Time] [2023-12-02 18:47:46,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 871 states. [2023-12-02 18:47:46,738 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 871 to 856. [2023-12-02 18:47:46,740 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 856 states, 626 states have (on average 1.2763578274760383) internal successors, (799), 630 states have internal predecessors, (799), 133 states have call successors, (133), 101 states have call predecessors, (133), 95 states have return successors, (138), 126 states have call predecessors, (138), 130 states have call successors, (138) [2023-12-02 18:47:46,743 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 856 states to 856 states and 1070 transitions. [2023-12-02 18:47:46,744 INFO L78 Accepts]: Start accepts. Automaton has 856 states and 1070 transitions. Word has length 55 [2023-12-02 18:47:46,744 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:47:46,744 INFO L495 AbstractCegarLoop]: Abstraction has 856 states and 1070 transitions. [2023-12-02 18:47:46,744 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 18:47:46,744 INFO L276 IsEmpty]: Start isEmpty. Operand 856 states and 1070 transitions. [2023-12-02 18:47:46,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2023-12-02 18:47:46,746 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:47:46,746 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 18:47:46,756 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-12-02 18:47:46,947 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:47:46,948 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 18:47:46,948 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:47:46,948 INFO L85 PathProgramCache]: Analyzing trace with hash 955501621, now seen corresponding path program 1 times [2023-12-02 18:47:46,948 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:47:46,948 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1270919501] [2023-12-02 18:47:46,948 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:47:46,948 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:47:46,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:47:47,007 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 18:47:47,007 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:47:47,007 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1270919501] [2023-12-02 18:47:47,007 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1270919501] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 18:47:47,007 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 18:47:47,007 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 18:47:47,008 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1319673257] [2023-12-02 18:47:47,008 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 18:47:47,008 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 18:47:47,008 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:47:47,009 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 18:47:47,009 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 18:47:47,009 INFO L87 Difference]: Start difference. First operand 856 states and 1070 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 18:47:47,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:47:47,239 INFO L93 Difference]: Finished difference Result 1438 states and 1753 transitions. [2023-12-02 18:47:47,240 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 18:47:47,240 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 18:47:47,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:47:47,245 INFO L225 Difference]: With dead ends: 1438 [2023-12-02 18:47:47,246 INFO L226 Difference]: Without dead ends: 1065 [2023-12-02 18:47:47,247 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 18:47:47,248 INFO L413 NwaCegarLoop]: 371 mSDtfsCounter, 43 mSDsluCounter, 329 mSDsCounter, 0 mSdLazyCounter, 136 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 700 SdHoareTripleChecker+Invalid, 136 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 136 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 18:47:47,248 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [43 Valid, 700 Invalid, 136 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 136 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 18:47:47,250 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1065 states. [2023-12-02 18:47:47,353 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1065 to 977. [2023-12-02 18:47:47,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 977 states, 707 states have (on average 1.2616690240452617) internal successors, (892), 715 states have internal predecessors, (892), 155 states have call successors, (155), 123 states have call predecessors, (155), 113 states have return successors, (160), 140 states have call predecessors, (160), 152 states have call successors, (160) [2023-12-02 18:47:47,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 977 states to 977 states and 1207 transitions. [2023-12-02 18:47:47,359 INFO L78 Accepts]: Start accepts. Automaton has 977 states and 1207 transitions. Word has length 61 [2023-12-02 18:47:47,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:47:47,359 INFO L495 AbstractCegarLoop]: Abstraction has 977 states and 1207 transitions. [2023-12-02 18:47:47,360 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 18:47:47,360 INFO L276 IsEmpty]: Start isEmpty. Operand 977 states and 1207 transitions. [2023-12-02 18:47:47,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2023-12-02 18:47:47,361 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:47:47,361 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 18:47:47,362 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2023-12-02 18:47:47,362 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 18:47:47,362 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:47:47,362 INFO L85 PathProgramCache]: Analyzing trace with hash 658964800, now seen corresponding path program 1 times [2023-12-02 18:47:47,362 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:47:47,363 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1096484677] [2023-12-02 18:47:47,363 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:47:47,363 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:47:47,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:47:47,492 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 18:47:47,492 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:47:47,492 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1096484677] [2023-12-02 18:47:47,492 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1096484677] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 18:47:47,493 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 18:47:47,493 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2023-12-02 18:47:47,493 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2088698794] [2023-12-02 18:47:47,493 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 18:47:47,493 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-12-02 18:47:47,494 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:47:47,494 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-12-02 18:47:47,494 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2023-12-02 18:47:47,494 INFO L87 Difference]: Start difference. First operand 977 states and 1207 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 18:47:48,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:47:48,304 INFO L93 Difference]: Finished difference Result 1974 states and 2367 transitions. [2023-12-02 18:47:48,304 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-12-02 18:47:48,304 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 18:47:48,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:47:48,312 INFO L225 Difference]: With dead ends: 1974 [2023-12-02 18:47:48,312 INFO L226 Difference]: Without dead ends: 1288 [2023-12-02 18:47:48,314 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=90, Invalid=216, Unknown=0, NotChecked=0, Total=306 [2023-12-02 18:47:48,315 INFO L413 NwaCegarLoop]: 215 mSDtfsCounter, 541 mSDsluCounter, 971 mSDsCounter, 0 mSdLazyCounter, 1064 mSolverCounterSat, 104 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 571 SdHoareTripleChecker+Valid, 1186 SdHoareTripleChecker+Invalid, 1168 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 104 IncrementalHoareTripleChecker+Valid, 1064 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-12-02 18:47:48,316 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [571 Valid, 1186 Invalid, 1168 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [104 Valid, 1064 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-12-02 18:47:48,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1288 states. [2023-12-02 18:47:48,469 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1288 to 1157. [2023-12-02 18:47:48,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1157 states, 827 states have (on average 1.2345828295042323) internal successors, (1021), 835 states have internal predecessors, (1021), 187 states have call successors, (187), 151 states have call predecessors, (187), 141 states have return successors, (192), 172 states have call predecessors, (192), 184 states have call successors, (192) [2023-12-02 18:47:48,478 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1157 states to 1157 states and 1400 transitions. [2023-12-02 18:47:48,479 INFO L78 Accepts]: Start accepts. Automaton has 1157 states and 1400 transitions. Word has length 63 [2023-12-02 18:47:48,479 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:47:48,479 INFO L495 AbstractCegarLoop]: Abstraction has 1157 states and 1400 transitions. [2023-12-02 18:47:48,479 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 18:47:48,479 INFO L276 IsEmpty]: Start isEmpty. Operand 1157 states and 1400 transitions. [2023-12-02 18:47:48,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2023-12-02 18:47:48,481 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:47:48,481 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 18:47:48,481 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2023-12-02 18:47:48,481 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 18:47:48,482 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:47:48,482 INFO L85 PathProgramCache]: Analyzing trace with hash -150592915, now seen corresponding path program 1 times [2023-12-02 18:47:48,482 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:47:48,482 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1827114502] [2023-12-02 18:47:48,482 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:47:48,482 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:47:48,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:47:48,602 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 18:47:48,603 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:47:48,603 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1827114502] [2023-12-02 18:47:48,603 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1827114502] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 18:47:48,603 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [890674519] [2023-12-02 18:47:48,603 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:47:48,603 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:47:48,603 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 18:47:48,609 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 18:47:48,610 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-12-02 18:47:48,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:47:48,734 INFO L262 TraceCheckSpWp]: Trace formula consists of 394 conjuncts, 9 conjunts are in the unsatisfiable core [2023-12-02 18:47:48,738 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 18:47:48,938 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 18:47:48,938 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 18:47:49,009 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 18:47:49,010 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [890674519] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 18:47:49,010 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [985282617] [2023-12-02 18:47:49,013 INFO L159 IcfgInterpreter]: Started Sifa with 54 locations of interest [2023-12-02 18:47:49,013 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 18:47:49,014 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 18:47:49,014 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 18:47:49,014 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 18:48:08,789 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events1 with input of size 211 for LOIs [2023-12-02 18:48:08,886 INFO L197 IcfgInterpreter]: Interpreting procedure error1 with input of size 210 for LOIs [2023-12-02 18:48:09,588 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread1 with input of size 178 for LOIs [2023-12-02 18:48:10,169 INFO L197 IcfgInterpreter]: Interpreting procedure activate_threads1 with input of size 215 for LOIs [2023-12-02 18:48:11,642 INFO L197 IcfgInterpreter]: Interpreting procedure is_do_write_p_triggered with input of size 211 for LOIs [2023-12-02 18:48:11,939 INFO L197 IcfgInterpreter]: Interpreting procedure is_do_read_c_triggered with input of size 211 for LOIs [2023-12-02 18:48:12,247 INFO L197 IcfgInterpreter]: Interpreting procedure fire_delta_events1 with input of size 211 for LOIs [2023-12-02 18:48:12,345 INFO L197 IcfgInterpreter]: Interpreting procedure update_channels1 with input of size 218 for LOIs [2023-12-02 18:48:12,448 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 18:48:46,105 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '26943#(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_~q_free~0_42 Int) (|v_ULTIMATE.start_eval1_~tmp___1~0#1_BEFORE_CALL_1| 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_7~0 2) (= ~E_8~0 2) (= 0 ~t4_st~0) (= ~T1_E~0 2) (= ~T5_E~0 2) (<= 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) (= ~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) (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) (= ~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 18:48:46,105 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 18:48:46,105 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 18:48:46,105 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 4] total 7 [2023-12-02 18:48:46,105 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1045672204] [2023-12-02 18:48:46,106 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 18:48:46,106 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-12-02 18:48:46,106 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:48:46,107 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-12-02 18:48:46,108 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=224, Invalid=1938, Unknown=0, NotChecked=0, Total=2162 [2023-12-02 18:48:46,108 INFO L87 Difference]: Start difference. First operand 1157 states and 1400 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 18:48:46,810 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:48:46,810 INFO L93 Difference]: Finished difference Result 3364 states and 3929 transitions. [2023-12-02 18:48:46,810 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-12-02 18:48:46,811 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 18:48:46,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:48:46,831 INFO L225 Difference]: With dead ends: 3364 [2023-12-02 18:48:46,831 INFO L226 Difference]: Without dead ends: 3361 [2023-12-02 18:48:46,834 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 148 SyntacticMatches, 2 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 948 ImplicationChecksByTransitivity, 33.6s TimeCoverageRelationStatistics Valid=224, Invalid=1938, Unknown=0, NotChecked=0, Total=2162 [2023-12-02 18:48:46,835 INFO L413 NwaCegarLoop]: 435 mSDtfsCounter, 604 mSDsluCounter, 745 mSDsCounter, 0 mSdLazyCounter, 565 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 604 SdHoareTripleChecker+Valid, 1180 SdHoareTripleChecker+Invalid, 581 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 565 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 18:48:46,835 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [604 Valid, 1180 Invalid, 581 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 565 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 18:48:46,840 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3361 states. [2023-12-02 18:48:47,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3361 to 2472. [2023-12-02 18:48:47,141 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2472 states, 1719 states have (on average 1.2001163467132054) internal successors, (2063), 1735 states have internal predecessors, (2063), 414 states have call successors, (414), 355 states have call predecessors, (414), 337 states have return successors, (431), 383 states have call predecessors, (431), 411 states have call successors, (431) [2023-12-02 18:48:47,152 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2472 states to 2472 states and 2908 transitions. [2023-12-02 18:48:47,152 INFO L78 Accepts]: Start accepts. Automaton has 2472 states and 2908 transitions. Word has length 64 [2023-12-02 18:48:47,153 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:48:47,153 INFO L495 AbstractCegarLoop]: Abstraction has 2472 states and 2908 transitions. [2023-12-02 18:48:47,153 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 18:48:47,153 INFO L276 IsEmpty]: Start isEmpty. Operand 2472 states and 2908 transitions. [2023-12-02 18:48:47,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2023-12-02 18:48:47,155 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:48:47,155 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 18:48:47,161 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-12-02 18:48:47,358 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2023-12-02 18:48:47,358 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 18:48:47,358 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:48:47,359 INFO L85 PathProgramCache]: Analyzing trace with hash 1263146376, now seen corresponding path program 2 times [2023-12-02 18:48:47,359 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:48:47,359 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [404339820] [2023-12-02 18:48:47,359 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:48:47,359 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:48:47,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:48:47,399 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 18:48:47,399 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:48:47,400 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [404339820] [2023-12-02 18:48:47,400 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [404339820] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 18:48:47,400 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 18:48:47,400 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 18:48:47,400 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [35957583] [2023-12-02 18:48:47,401 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 18:48:47,401 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 18:48:47,401 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:48:47,402 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 18:48:47,402 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 18:48:47,402 INFO L87 Difference]: Start difference. First operand 2472 states and 2908 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 18:48:47,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:48:47,688 INFO L93 Difference]: Finished difference Result 3668 states and 4280 transitions. [2023-12-02 18:48:47,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 18:48:47,689 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 18:48:47,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:48:47,699 INFO L225 Difference]: With dead ends: 3668 [2023-12-02 18:48:47,699 INFO L226 Difference]: Without dead ends: 1730 [2023-12-02 18:48:47,704 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 18:48:47,704 INFO L413 NwaCegarLoop]: 380 mSDtfsCounter, 373 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 91 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 373 SdHoareTripleChecker+Valid, 447 SdHoareTripleChecker+Invalid, 93 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 91 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 18:48:47,705 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [373 Valid, 447 Invalid, 93 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 91 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 18:48:47,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1730 states. [2023-12-02 18:48:47,933 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1730 to 1714. [2023-12-02 18:48:47,935 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1714 states, 1213 states have (on average 1.2003297609233305) internal successors, (1456), 1221 states have internal predecessors, (1456), 278 states have call successors, (278), 231 states have call predecessors, (278), 221 states have return successors, (287), 263 states have call predecessors, (287), 275 states have call successors, (287) [2023-12-02 18:48:47,939 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1714 states to 1714 states and 2021 transitions. [2023-12-02 18:48:47,939 INFO L78 Accepts]: Start accepts. Automaton has 1714 states and 2021 transitions. Word has length 67 [2023-12-02 18:48:47,939 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:48:47,940 INFO L495 AbstractCegarLoop]: Abstraction has 1714 states and 2021 transitions. [2023-12-02 18:48:47,940 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 18:48:47,940 INFO L276 IsEmpty]: Start isEmpty. Operand 1714 states and 2021 transitions. [2023-12-02 18:48:47,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2023-12-02 18:48:47,942 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:48:47,942 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] [2023-12-02 18:48:47,942 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2023-12-02 18:48:47,942 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 18:48:47,942 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:48:47,943 INFO L85 PathProgramCache]: Analyzing trace with hash -2120461595, now seen corresponding path program 1 times [2023-12-02 18:48:47,943 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:48:47,943 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [266305226] [2023-12-02 18:48:47,943 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:48:47,943 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:48:47,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:48:48,087 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 18:48:48,087 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:48:48,087 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [266305226] [2023-12-02 18:48:48,087 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [266305226] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 18:48:48,087 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 18:48:48,088 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-12-02 18:48:48,088 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2069729841] [2023-12-02 18:48:48,088 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 18:48:48,088 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 18:48:48,088 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:48:48,089 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 18:48:48,089 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-12-02 18:48:48,089 INFO L87 Difference]: Start difference. First operand 1714 states and 2021 transitions. Second operand has 5 states, 5 states have (on average 11.4) internal successors, (57), 5 states have internal predecessors, (57), 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 18:48:48,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:48:48,993 INFO L93 Difference]: Finished difference Result 2667 states and 3561 transitions. [2023-12-02 18:48:48,993 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-12-02 18:48:48,993 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 11.4) internal successors, (57), 5 states have internal predecessors, (57), 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 68 [2023-12-02 18:48:48,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:48:49,004 INFO L225 Difference]: With dead ends: 2667 [2023-12-02 18:48:49,004 INFO L226 Difference]: Without dead ends: 2468 [2023-12-02 18:48:49,007 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 18:48:49,008 INFO L413 NwaCegarLoop]: 559 mSDtfsCounter, 1526 mSDsluCounter, 907 mSDsCounter, 0 mSdLazyCounter, 563 mSolverCounterSat, 248 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1528 SdHoareTripleChecker+Valid, 1466 SdHoareTripleChecker+Invalid, 811 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 248 IncrementalHoareTripleChecker+Valid, 563 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-12-02 18:48:49,008 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1528 Valid, 1466 Invalid, 811 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [248 Valid, 563 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-12-02 18:48:49,011 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2468 states. [2023-12-02 18:48:49,350 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2468 to 2455. [2023-12-02 18:48:49,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2455 states, 1845 states have (on average 1.2986449864498646) internal successors, (2396), 1856 states have internal predecessors, (2396), 363 states have call successors, (363), 255 states have call predecessors, (363), 245 states have return successors, (434), 345 states have call predecessors, (434), 360 states have call successors, (434) [2023-12-02 18:48:49,363 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2455 states to 2455 states and 3193 transitions. [2023-12-02 18:48:49,363 INFO L78 Accepts]: Start accepts. Automaton has 2455 states and 3193 transitions. Word has length 68 [2023-12-02 18:48:49,363 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:48:49,363 INFO L495 AbstractCegarLoop]: Abstraction has 2455 states and 3193 transitions. [2023-12-02 18:48:49,364 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 11.4) internal successors, (57), 5 states have internal predecessors, (57), 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 18:48:49,364 INFO L276 IsEmpty]: Start isEmpty. Operand 2455 states and 3193 transitions. [2023-12-02 18:48:49,365 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2023-12-02 18:48:49,366 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:48:49,366 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 18:48:49,366 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2023-12-02 18:48:49,366 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 18:48:49,366 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:48:49,366 INFO L85 PathProgramCache]: Analyzing trace with hash 1310261016, now seen corresponding path program 1 times [2023-12-02 18:48:49,367 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:48:49,367 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2082561279] [2023-12-02 18:48:49,367 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:48:49,367 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:48:49,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:48:49,424 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 18:48:49,424 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:48:49,424 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2082561279] [2023-12-02 18:48:49,424 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2082561279] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 18:48:49,424 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 18:48:49,424 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 18:48:49,424 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1605370799] [2023-12-02 18:48:49,424 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 18:48:49,425 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 18:48:49,425 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:48:49,425 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 18:48:49,426 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 18:48:49,426 INFO L87 Difference]: Start difference. First operand 2455 states and 3193 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 18:48:49,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:48:49,795 INFO L93 Difference]: Finished difference Result 4052 states and 5021 transitions. [2023-12-02 18:48:49,795 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 18:48:49,796 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 18:48:49,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:48:49,810 INFO L225 Difference]: With dead ends: 4052 [2023-12-02 18:48:49,810 INFO L226 Difference]: Without dead ends: 2673 [2023-12-02 18:48:49,813 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 18:48:49,814 INFO L413 NwaCegarLoop]: 364 mSDtfsCounter, 38 mSDsluCounter, 329 mSDsCounter, 0 mSdLazyCounter, 135 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 693 SdHoareTripleChecker+Invalid, 135 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 135 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 18:48:49,814 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [38 Valid, 693 Invalid, 135 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 135 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 18:48:49,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2673 states. [2023-12-02 18:48:50,191 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2673 to 2592. [2023-12-02 18:48:50,196 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2592 states, 1942 states have (on average 1.2914521112255406) internal successors, (2508), 1959 states have internal predecessors, (2508), 384 states have call successors, (384), 276 states have call predecessors, (384), 264 states have return successors, (461), 358 states have call predecessors, (461), 381 states have call successors, (461) [2023-12-02 18:48:50,204 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2592 states to 2592 states and 3353 transitions. [2023-12-02 18:48:50,205 INFO L78 Accepts]: Start accepts. Automaton has 2592 states and 3353 transitions. Word has length 71 [2023-12-02 18:48:50,205 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:48:50,205 INFO L495 AbstractCegarLoop]: Abstraction has 2592 states and 3353 transitions. [2023-12-02 18:48:50,206 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 18:48:50,206 INFO L276 IsEmpty]: Start isEmpty. Operand 2592 states and 3353 transitions. [2023-12-02 18:48:50,209 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2023-12-02 18:48:50,209 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:48:50,209 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 18:48:50,209 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2023-12-02 18:48:50,209 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 18:48:50,210 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:48:50,210 INFO L85 PathProgramCache]: Analyzing trace with hash 1989042412, now seen corresponding path program 1 times [2023-12-02 18:48:50,210 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:48:50,210 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2110708835] [2023-12-02 18:48:50,210 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:48:50,210 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:48:50,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:48:50,601 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 18:48:50,601 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:48:50,601 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2110708835] [2023-12-02 18:48:50,601 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2110708835] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 18:48:50,601 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1019231251] [2023-12-02 18:48:50,602 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:48:50,602 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:48:50,602 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 18:48:50,603 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 18:48:50,605 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-12-02 18:48:50,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:48:50,754 INFO L262 TraceCheckSpWp]: Trace formula consists of 518 conjuncts, 13 conjunts are in the unsatisfiable core [2023-12-02 18:48:50,758 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 18:48:50,808 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 18:48:50,809 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 18:48:50,809 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1019231251] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 18:48:50,809 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 18:48:50,809 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [14] total 17 [2023-12-02 18:48:50,809 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1213039752] [2023-12-02 18:48:50,809 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 18:48:50,810 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 18:48:50,810 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:48:50,810 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 18:48:50,811 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2023-12-02 18:48:50,811 INFO L87 Difference]: Start difference. First operand 2592 states and 3353 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 18:48:51,350 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:48:51,350 INFO L93 Difference]: Finished difference Result 3992 states and 5009 transitions. [2023-12-02 18:48:51,350 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-12-02 18:48:51,351 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 18:48:51,351 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:48:51,362 INFO L225 Difference]: With dead ends: 3992 [2023-12-02 18:48:51,362 INFO L226 Difference]: Without dead ends: 2373 [2023-12-02 18:48:51,366 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 18:48:51,366 INFO L413 NwaCegarLoop]: 377 mSDtfsCounter, 365 mSDsluCounter, 1045 mSDsCounter, 0 mSdLazyCounter, 349 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 367 SdHoareTripleChecker+Valid, 1422 SdHoareTripleChecker+Invalid, 350 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 349 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 18:48:51,366 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [367 Valid, 1422 Invalid, 350 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 349 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 18:48:51,370 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2373 states. [2023-12-02 18:48:51,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2373 to 2085. [2023-12-02 18:48:51,668 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2085 states, 1626 states have (on average 1.3228782287822878) internal successors, (2151), 1641 states have internal predecessors, (2151), 280 states have call successors, (280), 185 states have call predecessors, (280), 177 states have return successors, (351), 260 states have call predecessors, (351), 277 states have call successors, (351) [2023-12-02 18:48:51,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2085 states to 2085 states and 2782 transitions. [2023-12-02 18:48:51,675 INFO L78 Accepts]: Start accepts. Automaton has 2085 states and 2782 transitions. Word has length 102 [2023-12-02 18:48:51,675 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:48:51,675 INFO L495 AbstractCegarLoop]: Abstraction has 2085 states and 2782 transitions. [2023-12-02 18:48:51,675 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 18:48:51,676 INFO L276 IsEmpty]: Start isEmpty. Operand 2085 states and 2782 transitions. [2023-12-02 18:48:51,679 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2023-12-02 18:48:51,679 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:48:51,680 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 18:48:51,685 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-12-02 18:48:51,880 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2023-12-02 18:48:51,880 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 18:48:51,881 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:48:51,881 INFO L85 PathProgramCache]: Analyzing trace with hash 1709462985, now seen corresponding path program 1 times [2023-12-02 18:48:51,881 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:48:51,881 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1177711337] [2023-12-02 18:48:51,881 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:48:51,881 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:48:51,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:48:52,065 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 18:48:52,065 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:48:52,066 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1177711337] [2023-12-02 18:48:52,066 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1177711337] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 18:48:52,066 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1615100324] [2023-12-02 18:48:52,066 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:48:52,066 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:48:52,066 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 18:48:52,067 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 18:48:52,069 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-12-02 18:48:52,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:48:52,222 INFO L262 TraceCheckSpWp]: Trace formula consists of 549 conjuncts, 14 conjunts are in the unsatisfiable core [2023-12-02 18:48:52,227 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 18:48:52,303 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 18:48:52,303 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 18:48:52,303 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1615100324] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 18:48:52,304 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 18:48:52,304 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [8] total 13 [2023-12-02 18:48:52,304 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1724407786] [2023-12-02 18:48:52,304 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 18:48:52,304 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-12-02 18:48:52,304 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:48:52,305 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-12-02 18:48:52,305 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2023-12-02 18:48:52,305 INFO L87 Difference]: Start difference. First operand 2085 states and 2782 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 18:48:52,799 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:48:52,799 INFO L93 Difference]: Finished difference Result 2871 states and 3677 transitions. [2023-12-02 18:48:52,799 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-12-02 18:48:52,800 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 18:48:52,800 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:48:52,810 INFO L225 Difference]: With dead ends: 2871 [2023-12-02 18:48:52,810 INFO L226 Difference]: Without dead ends: 1813 [2023-12-02 18:48:52,813 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 18:48:52,814 INFO L413 NwaCegarLoop]: 377 mSDtfsCounter, 66 mSDsluCounter, 1099 mSDsCounter, 0 mSdLazyCounter, 333 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 1476 SdHoareTripleChecker+Invalid, 336 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 333 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 18:48:52,814 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [67 Valid, 1476 Invalid, 336 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 333 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 18:48:52,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1813 states. [2023-12-02 18:48:53,049 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1813 to 1695. [2023-12-02 18:48:53,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1695 states, 1346 states have (on average 1.3536404160475484) internal successors, (1822), 1355 states have internal predecessors, (1822), 221 states have call successors, (221), 130 states have call predecessors, (221), 126 states have return successors, (282), 211 states have call predecessors, (282), 218 states have call successors, (282) [2023-12-02 18:48:53,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1695 states to 1695 states and 2325 transitions. [2023-12-02 18:48:53,058 INFO L78 Accepts]: Start accepts. Automaton has 1695 states and 2325 transitions. Word has length 112 [2023-12-02 18:48:53,058 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:48:53,058 INFO L495 AbstractCegarLoop]: Abstraction has 1695 states and 2325 transitions. [2023-12-02 18:48:53,058 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 18:48:53,059 INFO L276 IsEmpty]: Start isEmpty. Operand 1695 states and 2325 transitions. [2023-12-02 18:48:53,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2023-12-02 18:48:53,061 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:48:53,061 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] [2023-12-02 18:48:53,066 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-12-02 18:48:53,262 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2023-12-02 18:48:53,262 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 18:48:53,263 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:48:53,263 INFO L85 PathProgramCache]: Analyzing trace with hash -607731061, now seen corresponding path program 1 times [2023-12-02 18:48:53,263 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:48:53,263 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1603580590] [2023-12-02 18:48:53,263 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:48:53,263 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:48:53,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:48:53,321 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 27 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-12-02 18:48:53,321 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:48:53,322 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1603580590] [2023-12-02 18:48:53,322 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1603580590] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 18:48:53,322 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 18:48:53,322 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-12-02 18:48:53,322 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1427349469] [2023-12-02 18:48:53,322 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 18:48:53,323 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 18:48:53,323 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:48:53,323 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 18:48:53,323 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 18:48:53,324 INFO L87 Difference]: Start difference. First operand 1695 states and 2325 transitions. Second operand has 4 states, 4 states have (on average 17.0) internal successors, (68), 4 states have internal predecessors, (68), 4 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) [2023-12-02 18:48:53,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:48:53,773 INFO L93 Difference]: Finished difference Result 2188 states and 2883 transitions. [2023-12-02 18:48:53,773 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 18:48:53,773 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 17.0) internal successors, (68), 4 states have internal predecessors, (68), 4 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) Word has length 113 [2023-12-02 18:48:53,774 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:48:53,781 INFO L225 Difference]: With dead ends: 2188 [2023-12-02 18:48:53,781 INFO L226 Difference]: Without dead ends: 1562 [2023-12-02 18:48:53,783 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 18:48:53,784 INFO L413 NwaCegarLoop]: 370 mSDtfsCounter, 419 mSDsluCounter, 273 mSDsCounter, 0 mSdLazyCounter, 255 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 419 SdHoareTripleChecker+Valid, 643 SdHoareTripleChecker+Invalid, 258 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 255 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 18:48:53,784 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [419 Valid, 643 Invalid, 258 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 255 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 18:48:53,787 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1562 states. [2023-12-02 18:48:53,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1562 to 1515. [2023-12-02 18:48:53,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1515 states, 1218 states have (on average 1.3735632183908046) internal successors, (1673), 1225 states have internal predecessors, (1673), 193 states have call successors, (193), 104 states have call predecessors, (193), 102 states have return successors, (252), 187 states have call predecessors, (252), 190 states have call successors, (252) [2023-12-02 18:48:53,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1515 states to 1515 states and 2118 transitions. [2023-12-02 18:48:53,979 INFO L78 Accepts]: Start accepts. Automaton has 1515 states and 2118 transitions. Word has length 113 [2023-12-02 18:48:53,980 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:48:53,980 INFO L495 AbstractCegarLoop]: Abstraction has 1515 states and 2118 transitions. [2023-12-02 18:48:53,980 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 17.0) internal successors, (68), 4 states have internal predecessors, (68), 4 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) [2023-12-02 18:48:53,980 INFO L276 IsEmpty]: Start isEmpty. Operand 1515 states and 2118 transitions. [2023-12-02 18:48:53,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2023-12-02 18:48:53,983 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:48:53,983 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 18:48:53,983 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2023-12-02 18:48:53,984 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 18:48:53,984 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:48:53,984 INFO L85 PathProgramCache]: Analyzing trace with hash 349197322, now seen corresponding path program 1 times [2023-12-02 18:48:53,984 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:48:53,984 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [444280243] [2023-12-02 18:48:53,984 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:48:53,985 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:48:54,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:48:54,136 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 18:48:54,136 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:48:54,137 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [444280243] [2023-12-02 18:48:54,137 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [444280243] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 18:48:54,137 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1512169809] [2023-12-02 18:48:54,137 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:48:54,137 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:48:54,137 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 18:48:54,138 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 18:48:54,141 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-12-02 18:48:54,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:48:54,299 INFO L262 TraceCheckSpWp]: Trace formula consists of 555 conjuncts, 6 conjunts are in the unsatisfiable core [2023-12-02 18:48:54,303 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 18:48:54,359 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 18:48:54,359 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 18:48:54,359 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1512169809] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 18:48:54,359 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 18:48:54,359 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [8] total 11 [2023-12-02 18:48:54,359 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1352175043] [2023-12-02 18:48:54,359 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 18:48:54,360 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 18:48:54,360 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:48:54,360 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 18:48:54,361 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2023-12-02 18:48:54,361 INFO L87 Difference]: Start difference. First operand 1515 states and 2118 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 18:48:54,767 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:48:54,767 INFO L93 Difference]: Finished difference Result 2264 states and 2963 transitions. [2023-12-02 18:48:54,767 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-12-02 18:48:54,767 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 18:48:54,768 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:48:54,774 INFO L225 Difference]: With dead ends: 2264 [2023-12-02 18:48:54,774 INFO L226 Difference]: Without dead ends: 1807 [2023-12-02 18:48:54,776 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 18:48:54,777 INFO L413 NwaCegarLoop]: 368 mSDtfsCounter, 350 mSDsluCounter, 1165 mSDsCounter, 0 mSdLazyCounter, 310 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 351 SdHoareTripleChecker+Valid, 1533 SdHoareTripleChecker+Invalid, 313 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 310 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 18:48:54,777 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [351 Valid, 1533 Invalid, 313 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 310 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 18:48:54,779 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1807 states. [2023-12-02 18:48:54,982 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1807 to 1773. [2023-12-02 18:48:54,985 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1773 states, 1380 states have (on average 1.3427536231884059) internal successors, (1853), 1393 states have internal predecessors, (1853), 241 states have call successors, (241), 146 states have call predecessors, (241), 150 states have return successors, (312), 235 states have call predecessors, (312), 238 states have call successors, (312) [2023-12-02 18:48:54,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1773 states to 1773 states and 2406 transitions. [2023-12-02 18:48:54,990 INFO L78 Accepts]: Start accepts. Automaton has 1773 states and 2406 transitions. Word has length 113 [2023-12-02 18:48:54,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:48:54,991 INFO L495 AbstractCegarLoop]: Abstraction has 1773 states and 2406 transitions. [2023-12-02 18:48:54,992 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 18:48:54,992 INFO L276 IsEmpty]: Start isEmpty. Operand 1773 states and 2406 transitions. [2023-12-02 18:48:54,995 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2023-12-02 18:48:54,995 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:48:54,995 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 18:48:55,001 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-12-02 18:48:55,196 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:48:55,196 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 18:48:55,196 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:48:55,197 INFO L85 PathProgramCache]: Analyzing trace with hash -403946444, now seen corresponding path program 1 times [2023-12-02 18:48:55,197 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:48:55,197 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [809895766] [2023-12-02 18:48:55,197 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:48:55,197 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:48:55,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:48:56,169 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 18:48:56,169 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:48:56,169 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [809895766] [2023-12-02 18:48:56,169 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [809895766] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 18:48:56,169 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [638682357] [2023-12-02 18:48:56,170 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:48:56,170 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:48:56,170 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 18:48:56,171 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 18:48:56,171 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-12-02 18:48:56,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:48:56,295 INFO L262 TraceCheckSpWp]: Trace formula consists of 560 conjuncts, 59 conjunts are in the unsatisfiable core [2023-12-02 18:48:56,299 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 18:48:57,046 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 18:48:57,046 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 18:48:58,561 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 18:48:58,561 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [638682357] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 18:48:58,561 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1009344299] [2023-12-02 18:48:58,564 INFO L159 IcfgInterpreter]: Started Sifa with 68 locations of interest [2023-12-02 18:48:58,564 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 18:48:58,564 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 18:48:58,565 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 18:48:58,565 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 18:49:53,357 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events1 with input of size 7 for LOIs [2023-12-02 18:49:53,359 INFO L197 IcfgInterpreter]: Interpreting procedure error1 with input of size 13 for LOIs [2023-12-02 18:49:53,361 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread1 with input of size 7 for LOIs [2023-12-02 18:49:53,363 INFO L197 IcfgInterpreter]: Interpreting procedure activate_threads1 with input of size 224 for LOIs [2023-12-02 18:49:55,340 INFO L197 IcfgInterpreter]: Interpreting procedure is_do_write_p_triggered with input of size 225 for LOIs [2023-12-02 18:49:57,275 INFO L197 IcfgInterpreter]: Interpreting procedure is_do_read_c_triggered with input of size 23 for LOIs [2023-12-02 18:49:57,310 INFO L197 IcfgInterpreter]: Interpreting procedure fire_delta_events1 with input of size 218 for LOIs [2023-12-02 18:49:57,645 INFO L197 IcfgInterpreter]: Interpreting procedure update_channels1 with input of size 229 for LOIs [2023-12-02 18:49:58,006 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 18:50:11,200 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '83558#(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 18:50:11,200 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 18:50:11,200 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 18:50:11,200 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 17, 16] total 55 [2023-12-02 18:50:11,200 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2023437339] [2023-12-02 18:50:11,200 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 18:50:11,201 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2023-12-02 18:50:11,201 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:50:11,203 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2023-12-02 18:50:11,207 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=870, Invalid=10902, Unknown=0, NotChecked=0, Total=11772 [2023-12-02 18:50:11,207 INFO L87 Difference]: Start difference. First operand 1773 states and 2406 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 18:50:29,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:50:29,201 INFO L93 Difference]: Finished difference Result 4680 states and 5957 transitions. [2023-12-02 18:50:29,201 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 283 states. [2023-12-02 18:50:29,202 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 18:50:29,202 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:50:29,217 INFO L225 Difference]: With dead ends: 4680 [2023-12-02 18:50:29,217 INFO L226 Difference]: Without dead ends: 3962 [2023-12-02 18:50:29,253 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 681 GetRequests, 293 SyntacticMatches, 3 SemanticMatches, 385 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 61199 ImplicationChecksByTransitivity, 26.7s TimeCoverageRelationStatistics Valid=13488, Invalid=135894, Unknown=0, NotChecked=0, Total=149382 [2023-12-02 18:50:29,254 INFO L413 NwaCegarLoop]: 308 mSDtfsCounter, 5761 mSDsluCounter, 4316 mSDsCounter, 0 mSdLazyCounter, 7647 mSolverCounterSat, 2382 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5761 SdHoareTripleChecker+Valid, 4624 SdHoareTripleChecker+Invalid, 10029 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 2382 IncrementalHoareTripleChecker+Valid, 7647 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.2s IncrementalHoareTripleChecker+Time [2023-12-02 18:50:29,254 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5761 Valid, 4624 Invalid, 10029 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [2382 Valid, 7647 Invalid, 0 Unknown, 0 Unchecked, 4.2s Time] [2023-12-02 18:50:29,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3962 states. [2023-12-02 18:50:29,543 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3962 to 2048. [2023-12-02 18:50:29,545 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2048 states, 1563 states have (on average 1.3192578374920025) internal successors, (2062), 1578 states have internal predecessors, (2062), 286 states have call successors, (286), 183 states have call predecessors, (286), 197 states have return successors, (369), 288 states have call predecessors, (369), 283 states have call successors, (369) [2023-12-02 18:50:29,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2048 states to 2048 states and 2717 transitions. [2023-12-02 18:50:29,549 INFO L78 Accepts]: Start accepts. Automaton has 2048 states and 2717 transitions. Word has length 114 [2023-12-02 18:50:29,549 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:50:29,549 INFO L495 AbstractCegarLoop]: Abstraction has 2048 states and 2717 transitions. [2023-12-02 18:50:29,549 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 18:50:29,549 INFO L276 IsEmpty]: Start isEmpty. Operand 2048 states and 2717 transitions. [2023-12-02 18:50:29,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2023-12-02 18:50:29,552 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:50:29,552 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 18:50:29,556 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-12-02 18:50:29,752 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2023-12-02 18:50:29,753 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 18:50:29,753 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:50:29,753 INFO L85 PathProgramCache]: Analyzing trace with hash 377151869, now seen corresponding path program 1 times [2023-12-02 18:50:29,753 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:50:29,753 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1282906411] [2023-12-02 18:50:29,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:50:29,753 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:50:29,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:50:30,019 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 18:50:30,019 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:50:30,019 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1282906411] [2023-12-02 18:50:30,019 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1282906411] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 18:50:30,019 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [53073387] [2023-12-02 18:50:30,019 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:50:30,020 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:50:30,020 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 18:50:30,021 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 18:50:30,023 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-12-02 18:50:30,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:50:30,174 INFO L262 TraceCheckSpWp]: Trace formula consists of 559 conjuncts, 22 conjunts are in the unsatisfiable core [2023-12-02 18:50:30,177 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 18:50:30,253 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 18:50:30,253 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 18:50:30,425 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 18:50:30,425 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [53073387] provided 1 perfect and 1 imperfect interpolant sequences [2023-12-02 18:50:30,425 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-12-02 18:50:30,426 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [14, 8] total 20 [2023-12-02 18:50:30,426 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [742696498] [2023-12-02 18:50:30,426 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 18:50:30,426 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-12-02 18:50:30,426 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:50:30,427 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-12-02 18:50:30,427 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2023-12-02 18:50:30,427 INFO L87 Difference]: Start difference. First operand 2048 states and 2717 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 18:50:31,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:50:31,320 INFO L93 Difference]: Finished difference Result 3372 states and 4265 transitions. [2023-12-02 18:50:31,320 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-12-02 18:50:31,321 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 18:50:31,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:50:31,329 INFO L225 Difference]: With dead ends: 3372 [2023-12-02 18:50:31,329 INFO L226 Difference]: Without dead ends: 2381 [2023-12-02 18:50:31,331 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 18:50:31,332 INFO L413 NwaCegarLoop]: 284 mSDtfsCounter, 533 mSDsluCounter, 524 mSDsCounter, 0 mSdLazyCounter, 1030 mSolverCounterSat, 103 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 536 SdHoareTripleChecker+Valid, 808 SdHoareTripleChecker+Invalid, 1133 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 103 IncrementalHoareTripleChecker+Valid, 1030 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-12-02 18:50:31,332 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [536 Valid, 808 Invalid, 1133 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [103 Valid, 1030 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-12-02 18:50:31,334 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2381 states. [2023-12-02 18:50:31,623 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2381 to 2128. [2023-12-02 18:50:31,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2128 states, 1608 states have (on average 1.3140547263681592) internal successors, (2113), 1626 states have internal predecessors, (2113), 305 states have call successors, (305), 192 states have call predecessors, (305), 213 states have return successors, (409), 311 states have call predecessors, (409), 302 states have call successors, (409) [2023-12-02 18:50:31,628 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2128 states to 2128 states and 2827 transitions. [2023-12-02 18:50:31,628 INFO L78 Accepts]: Start accepts. Automaton has 2128 states and 2827 transitions. Word has length 115 [2023-12-02 18:50:31,629 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:50:31,629 INFO L495 AbstractCegarLoop]: Abstraction has 2128 states and 2827 transitions. [2023-12-02 18:50:31,629 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 18:50:31,629 INFO L276 IsEmpty]: Start isEmpty. Operand 2128 states and 2827 transitions. [2023-12-02 18:50:31,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2023-12-02 18:50:31,632 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:50:31,632 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 18:50:31,636 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2023-12-02 18:50:31,832 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2023-12-02 18:50:31,833 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 18:50:31,833 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:50:31,833 INFO L85 PathProgramCache]: Analyzing trace with hash 1334226278, now seen corresponding path program 1 times [2023-12-02 18:50:31,833 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:50:31,834 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1161006138] [2023-12-02 18:50:31,834 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:50:31,834 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:50:31,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:50:32,464 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 18:50:32,464 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:50:32,464 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1161006138] [2023-12-02 18:50:32,464 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1161006138] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 18:50:32,464 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1541273627] [2023-12-02 18:50:32,464 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:50:32,464 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:50:32,464 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 18:50:32,465 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 18:50:32,467 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-12-02 18:50:32,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:50:32,618 INFO L262 TraceCheckSpWp]: Trace formula consists of 587 conjuncts, 62 conjunts are in the unsatisfiable core [2023-12-02 18:50:32,624 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 18:50:33,377 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 18:50:33,378 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 18:50:34,930 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 18:50:34,930 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1541273627] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 18:50:34,931 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1055770224] [2023-12-02 18:50:34,934 INFO L159 IcfgInterpreter]: Started Sifa with 69 locations of interest [2023-12-02 18:50:34,934 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 18:50:34,934 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 18:50:34,934 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 18:50:34,935 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 18:51:01,163 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events1 with input of size 7 for LOIs [2023-12-02 18:51:01,166 INFO L197 IcfgInterpreter]: Interpreting procedure error1 with input of size 77 for LOIs [2023-12-02 18:51:01,203 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread1 with input of size 7 for LOIs [2023-12-02 18:51:01,207 INFO L197 IcfgInterpreter]: Interpreting procedure activate_threads1 with input of size 225 for LOIs [2023-12-02 18:51:03,176 INFO L197 IcfgInterpreter]: Interpreting procedure is_do_write_p_triggered with input of size 226 for LOIs [2023-12-02 18:51:05,150 INFO L197 IcfgInterpreter]: Interpreting procedure is_do_read_c_triggered with input of size 16 for LOIs [2023-12-02 18:51:05,169 INFO L197 IcfgInterpreter]: Interpreting procedure fire_delta_events1 with input of size 219 for LOIs [2023-12-02 18:51:05,513 INFO L197 IcfgInterpreter]: Interpreting procedure update_channels1 with input of size 230 for LOIs [2023-12-02 18:51:05,875 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 18:51:20,084 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '101814#(and (= ~q_req_up~0 1) (exists ((v_~q_req_up~0_100 Int) (|v_ULTIMATE.start_eval1_~tmp___1~0#1_BEFORE_CALL_10| Int) (|v_ULTIMATE.start_eval1_~tmp~2#1_BEFORE_CALL_10| Int) (v_~q_free~0_104 Int)) (and (or (and (= v_~q_free~0_104 0) (= ~p_dw_pc~0 1) (= 2 ~p_dw_st~0)) (and (<= v_~q_free~0_104 1) (<= 0 ~p_dw_pc~0) (= |v_ULTIMATE.start_eval1_~tmp___1~0#1_BEFORE_CALL_10| 1) (= |v_ULTIMATE.start_eval1_~tmp~2#1_BEFORE_CALL_10| 0))) (or (exists ((v_~p_dw_st~0_135 Int) (v_~p_dw_pc~0_47 Int)) (and (or (and (<= |v_ULTIMATE.start_eval1_~tmp~2#1_BEFORE_CALL_10| 2147483647) (= v_~p_dw_st~0_135 1) (= |v_ULTIMATE.start_eval1_~tmp___1~0#1_BEFORE_CALL_10| 1) (<= 0 (+ |v_ULTIMATE.start_eval1_~tmp~2#1_BEFORE_CALL_10| 2147483648)) (= v_~p_dw_pc~0_47 0)) (and (= v_~q_req_up~0_100 1) (<= |v_ULTIMATE.start_eval1_~tmp~2#1_BEFORE_CALL_10| 2147483647) (<= ~q_buf_0~0 2147483647) (= v_~p_dw_st~0_135 1) (= v_~p_dw_pc~0_47 1) (<= 0 (+ ~p_last_write~0 2147483648)) (= |v_ULTIMATE.start_eval1_~tmp___1~0#1_BEFORE_CALL_10| 1) (<= 0 (+ |v_ULTIMATE.start_eval1_~tmp~2#1_BEFORE_CALL_10| 2147483648)))) (not (= |v_ULTIMATE.start_eval1_~tmp~2#1_BEFORE_CALL_10| 0)))) (= ~p_dw_st~0 0)))) (= ~q_free~0 1) (= ~c_dr_pc~0 1) (not (= ~c_num_read~0 ~p_num_write~0)) (= ~c_last_read~0 ~q_buf_0~0) (= ~c_last_read~0 ~p_last_write~0) (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 18:51:20,084 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 18:51:20,084 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 18:51:20,084 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 18] total 51 [2023-12-02 18:51:20,085 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [667993001] [2023-12-02 18:51:20,085 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 18:51:20,085 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2023-12-02 18:51:20,085 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:51:20,086 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2023-12-02 18:51:20,088 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=955, Invalid=10601, Unknown=0, NotChecked=0, Total=11556 [2023-12-02 18:51:20,088 INFO L87 Difference]: Start difference. First operand 2128 states and 2827 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 18:51:27,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:51:27,922 INFO L93 Difference]: Finished difference Result 4333 states and 5406 transitions. [2023-12-02 18:51:27,923 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 103 states. [2023-12-02 18:51:27,923 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 18:51:27,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:51:27,931 INFO L225 Difference]: With dead ends: 4333 [2023-12-02 18:51:27,932 INFO L226 Difference]: Without dead ends: 3262 [2023-12-02 18:51:27,936 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 526 GetRequests, 318 SyntacticMatches, 1 SemanticMatches, 207 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 17116 ImplicationChecksByTransitivity, 18.0s TimeCoverageRelationStatistics Valid=4300, Invalid=39172, Unknown=0, NotChecked=0, Total=43472 [2023-12-02 18:51:27,936 INFO L413 NwaCegarLoop]: 269 mSDtfsCounter, 7976 mSDsluCounter, 3051 mSDsCounter, 0 mSdLazyCounter, 6237 mSolverCounterSat, 3759 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7976 SdHoareTripleChecker+Valid, 3320 SdHoareTripleChecker+Invalid, 9996 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 3759 IncrementalHoareTripleChecker+Valid, 6237 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.8s IncrementalHoareTripleChecker+Time [2023-12-02 18:51:27,937 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7976 Valid, 3320 Invalid, 9996 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [3759 Valid, 6237 Invalid, 0 Unknown, 0 Unchecked, 3.8s Time] [2023-12-02 18:51:27,939 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3262 states. [2023-12-02 18:51:28,212 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3262 to 1944. [2023-12-02 18:51:28,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1944 states, 1496 states have (on average 1.3268716577540107) internal successors, (1985), 1513 states have internal predecessors, (1985), 265 states have call successors, (265), 160 states have call predecessors, (265), 181 states have return successors, (359), 272 states have call predecessors, (359), 262 states have call successors, (359) [2023-12-02 18:51:28,218 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1944 states to 1944 states and 2609 transitions. [2023-12-02 18:51:28,218 INFO L78 Accepts]: Start accepts. Automaton has 1944 states and 2609 transitions. Word has length 124 [2023-12-02 18:51:28,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:51:28,219 INFO L495 AbstractCegarLoop]: Abstraction has 1944 states and 2609 transitions. [2023-12-02 18:51:28,219 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 18:51:28,219 INFO L276 IsEmpty]: Start isEmpty. Operand 1944 states and 2609 transitions. [2023-12-02 18:51:28,221 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2023-12-02 18:51:28,221 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:51:28,221 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 18:51:28,226 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2023-12-02 18:51:28,421 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:51:28,422 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 18:51:28,422 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:51:28,422 INFO L85 PathProgramCache]: Analyzing trace with hash 130526954, now seen corresponding path program 1 times [2023-12-02 18:51:28,422 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:51:28,422 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2145290761] [2023-12-02 18:51:28,422 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:51:28,422 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:51:28,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:51:28,597 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 18:51:28,598 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:51:28,598 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2145290761] [2023-12-02 18:51:28,598 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2145290761] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 18:51:28,598 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [570446400] [2023-12-02 18:51:28,598 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:51:28,598 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:51:28,598 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 18:51:28,599 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 18:51:28,601 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-12-02 18:51:28,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:51:28,709 INFO L262 TraceCheckSpWp]: Trace formula consists of 586 conjuncts, 23 conjunts are in the unsatisfiable core [2023-12-02 18:51:28,713 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 18:51:28,805 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 18:51:28,806 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 18:51:28,945 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 18:51:28,945 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [570446400] provided 1 perfect and 1 imperfect interpolant sequences [2023-12-02 18:51:28,945 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-12-02 18:51:28,945 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [9, 10] total 17 [2023-12-02 18:51:28,945 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1619614727] [2023-12-02 18:51:28,945 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 18:51:28,946 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-12-02 18:51:28,946 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:51:28,946 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-12-02 18:51:28,946 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2023-12-02 18:51:28,946 INFO L87 Difference]: Start difference. First operand 1944 states and 2609 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 18:51:29,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:51:29,875 INFO L93 Difference]: Finished difference Result 2599 states and 3350 transitions. [2023-12-02 18:51:29,875 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-12-02 18:51:29,875 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 18:51:29,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:51:29,879 INFO L225 Difference]: With dead ends: 2599 [2023-12-02 18:51:29,879 INFO L226 Difference]: Without dead ends: 1712 [2023-12-02 18:51:29,881 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 270 GetRequests, 247 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=109, Invalid=491, Unknown=0, NotChecked=0, Total=600 [2023-12-02 18:51:29,881 INFO L413 NwaCegarLoop]: 269 mSDtfsCounter, 792 mSDsluCounter, 505 mSDsCounter, 0 mSdLazyCounter, 1084 mSolverCounterSat, 165 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 793 SdHoareTripleChecker+Valid, 774 SdHoareTripleChecker+Invalid, 1249 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 165 IncrementalHoareTripleChecker+Valid, 1084 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-12-02 18:51:29,882 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [793 Valid, 774 Invalid, 1249 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [165 Valid, 1084 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-12-02 18:51:29,883 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1712 states. [2023-12-02 18:51:30,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1712 to 1675. [2023-12-02 18:51:30,117 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1675 states, 1297 states have (on average 1.3415574402467232) internal successors, (1740), 1314 states have internal predecessors, (1740), 229 states have call successors, (229), 130 states have call predecessors, (229), 147 states have return successors, (318), 232 states have call predecessors, (318), 226 states have call successors, (318) [2023-12-02 18:51:30,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1675 states to 1675 states and 2287 transitions. [2023-12-02 18:51:30,121 INFO L78 Accepts]: Start accepts. Automaton has 1675 states and 2287 transitions. Word has length 125 [2023-12-02 18:51:30,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:51:30,121 INFO L495 AbstractCegarLoop]: Abstraction has 1675 states and 2287 transitions. [2023-12-02 18:51:30,121 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 18:51:30,121 INFO L276 IsEmpty]: Start isEmpty. Operand 1675 states and 2287 transitions. [2023-12-02 18:51:30,123 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2023-12-02 18:51:30,123 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:51:30,124 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 18:51:30,128 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-12-02 18:51:30,324 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:51:30,324 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 18:51:30,325 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:51:30,325 INFO L85 PathProgramCache]: Analyzing trace with hash -729554002, now seen corresponding path program 1 times [2023-12-02 18:51:30,325 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:51:30,325 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [518455077] [2023-12-02 18:51:30,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:51:30,325 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:51:30,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:51:30,446 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-12-02 18:51:30,446 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:51:30,446 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [518455077] [2023-12-02 18:51:30,446 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [518455077] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 18:51:30,446 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1980959154] [2023-12-02 18:51:30,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:51:30,447 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:51:30,447 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 18:51:30,448 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 18:51:30,452 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-12-02 18:51:30,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:51:30,680 INFO L262 TraceCheckSpWp]: Trace formula consists of 1048 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 18:51:30,684 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 18:51:30,712 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2023-12-02 18:51:30,712 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 18:51:30,712 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1980959154] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 18:51:30,712 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 18:51:30,712 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-12-02 18:51:30,713 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [460466935] [2023-12-02 18:51:30,713 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 18:51:30,713 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 18:51:30,713 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:51:30,714 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 18:51:30,714 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 18:51:30,714 INFO L87 Difference]: Start difference. First operand 1675 states and 2287 transitions. Second operand has 3 states, 3 states have (on average 28.666666666666668) internal successors, (86), 2 states have internal predecessors, (86), 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 18:51:31,159 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:51:31,159 INFO L93 Difference]: Finished difference Result 3539 states and 5329 transitions. [2023-12-02 18:51:31,160 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 18:51:31,160 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 28.666666666666668) internal successors, (86), 2 states have internal predecessors, (86), 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 138 [2023-12-02 18:51:31,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:51:31,168 INFO L225 Difference]: With dead ends: 3539 [2023-12-02 18:51:31,168 INFO L226 Difference]: Without dead ends: 2599 [2023-12-02 18:51:31,173 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 138 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 18:51:31,174 INFO L413 NwaCegarLoop]: 333 mSDtfsCounter, 366 mSDsluCounter, 246 mSDsCounter, 0 mSdLazyCounter, 116 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 366 SdHoareTripleChecker+Valid, 579 SdHoareTripleChecker+Invalid, 118 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 116 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 18:51:31,175 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [366 Valid, 579 Invalid, 118 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 116 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 18:51:31,178 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2599 states. [2023-12-02 18:51:31,501 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2599 to 2590. [2023-12-02 18:51:31,504 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2590 states, 2080 states have (on average 1.3942307692307692) internal successors, (2900), 2100 states have internal predecessors, (2900), 331 states have call successors, (331), 160 states have call predecessors, (331), 177 states have return successors, (478), 331 states have call predecessors, (478), 328 states have call successors, (478) [2023-12-02 18:51:31,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2590 states to 2590 states and 3709 transitions. [2023-12-02 18:51:31,509 INFO L78 Accepts]: Start accepts. Automaton has 2590 states and 3709 transitions. Word has length 138 [2023-12-02 18:51:31,509 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:51:31,510 INFO L495 AbstractCegarLoop]: Abstraction has 2590 states and 3709 transitions. [2023-12-02 18:51:31,510 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 28.666666666666668) internal successors, (86), 2 states have internal predecessors, (86), 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 18:51:31,510 INFO L276 IsEmpty]: Start isEmpty. Operand 2590 states and 3709 transitions. [2023-12-02 18:51:31,513 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2023-12-02 18:51:31,513 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:51:31,513 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 18:51:31,519 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2023-12-02 18:51:31,713 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:51:31,714 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 18:51:31,714 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:51:31,714 INFO L85 PathProgramCache]: Analyzing trace with hash -578276658, now seen corresponding path program 1 times [2023-12-02 18:51:31,714 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:51:31,714 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2102384170] [2023-12-02 18:51:31,714 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:51:31,714 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:51:31,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:51:31,871 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-12-02 18:51:31,871 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:51:31,872 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2102384170] [2023-12-02 18:51:31,872 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2102384170] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 18:51:31,872 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [96476028] [2023-12-02 18:51:31,872 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:51:31,872 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:51:31,872 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 18:51:31,874 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 18:51:31,876 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-12-02 18:51:32,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:51:32,125 INFO L262 TraceCheckSpWp]: Trace formula consists of 1042 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 18:51:32,129 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 18:51:32,166 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 20 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-12-02 18:51:32,167 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 18:51:32,167 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [96476028] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 18:51:32,167 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 18:51:32,167 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-12-02 18:51:32,167 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1782035743] [2023-12-02 18:51:32,167 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 18:51:32,168 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 18:51:32,168 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:51:32,168 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 18:51:32,168 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 18:51:32,169 INFO L87 Difference]: Start difference. First operand 2590 states and 3709 transitions. Second operand has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 2 states have internal predecessors, (95), 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 18:51:32,807 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:51:32,807 INFO L93 Difference]: Finished difference Result 6269 states and 9687 transitions. [2023-12-02 18:51:32,807 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 18:51:32,807 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 2 states have internal predecessors, (95), 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 138 [2023-12-02 18:51:32,807 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:51:32,818 INFO L225 Difference]: With dead ends: 6269 [2023-12-02 18:51:32,818 INFO L226 Difference]: Without dead ends: 4414 [2023-12-02 18:51:32,825 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 138 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 18:51:32,825 INFO L413 NwaCegarLoop]: 328 mSDtfsCounter, 357 mSDsluCounter, 246 mSDsCounter, 0 mSdLazyCounter, 116 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 357 SdHoareTripleChecker+Valid, 574 SdHoareTripleChecker+Invalid, 118 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 116 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 18:51:32,825 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [357 Valid, 574 Invalid, 118 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 116 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 18:51:32,829 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4414 states. [2023-12-02 18:51:33,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4414 to 4400. [2023-12-02 18:51:33,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4400 states, 3631 states have (on average 1.4293583034976591) internal successors, (5190), 3657 states have internal predecessors, (5190), 530 states have call successors, (530), 220 states have call predecessors, (530), 237 states have return successors, (789), 524 states have call predecessors, (789), 527 states have call successors, (789) [2023-12-02 18:51:33,291 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4400 states to 4400 states and 6509 transitions. [2023-12-02 18:51:33,291 INFO L78 Accepts]: Start accepts. Automaton has 4400 states and 6509 transitions. Word has length 138 [2023-12-02 18:51:33,292 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:51:33,292 INFO L495 AbstractCegarLoop]: Abstraction has 4400 states and 6509 transitions. [2023-12-02 18:51:33,292 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 2 states have internal predecessors, (95), 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 18:51:33,292 INFO L276 IsEmpty]: Start isEmpty. Operand 4400 states and 6509 transitions. [2023-12-02 18:51:33,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2023-12-02 18:51:33,298 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:51:33,298 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 18:51:33,303 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2023-12-02 18:51:33,498 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2023-12-02 18:51:33,498 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 18:51:33,499 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:51:33,499 INFO L85 PathProgramCache]: Analyzing trace with hash 2050514862, now seen corresponding path program 1 times [2023-12-02 18:51:33,499 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:51:33,499 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [965789400] [2023-12-02 18:51:33,499 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:51:33,499 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:51:33,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:51:33,623 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-12-02 18:51:33,623 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:51:33,623 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [965789400] [2023-12-02 18:51:33,623 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [965789400] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 18:51:33,624 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [346855170] [2023-12-02 18:51:33,624 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:51:33,624 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:51:33,624 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 18:51:33,625 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 18:51:33,627 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-12-02 18:51:33,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:51:33,867 INFO L262 TraceCheckSpWp]: Trace formula consists of 1036 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 18:51:33,869 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 18:51:33,897 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-12-02 18:51:33,897 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 18:51:33,897 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [346855170] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 18:51:33,897 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 18:51:33,897 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-12-02 18:51:33,897 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2080766447] [2023-12-02 18:51:33,897 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 18:51:33,897 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 18:51:33,898 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:51:33,898 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 18:51:33,898 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 18:51:33,898 INFO L87 Difference]: Start difference. First operand 4400 states and 6509 transitions. Second operand has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 2 states have internal predecessors, (89), 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 18:51:34,791 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:51:34,791 INFO L93 Difference]: Finished difference Result 11669 states and 18262 transitions. [2023-12-02 18:51:34,792 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 18:51:34,792 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 2 states have internal predecessors, (89), 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 138 [2023-12-02 18:51:34,792 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:51:34,819 INFO L225 Difference]: With dead ends: 11669 [2023-12-02 18:51:34,820 INFO L226 Difference]: Without dead ends: 8004 [2023-12-02 18:51:34,834 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 138 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 18:51:34,835 INFO L413 NwaCegarLoop]: 328 mSDtfsCounter, 363 mSDsluCounter, 246 mSDsCounter, 0 mSdLazyCounter, 116 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 363 SdHoareTripleChecker+Valid, 574 SdHoareTripleChecker+Invalid, 118 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 116 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 18:51:34,835 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [363 Valid, 574 Invalid, 118 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 116 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 18:51:34,842 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8004 states. [2023-12-02 18:51:35,569 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8004 to 7980. [2023-12-02 18:51:35,575 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7980 states, 6703 states have (on average 1.448605102193048) internal successors, (9710), 6741 states have internal predecessors, (9710), 918 states have call successors, (918), 340 states have call predecessors, (918), 357 states have return successors, (1393), 900 states have call predecessors, (1393), 915 states have call successors, (1393) [2023-12-02 18:51:35,603 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7980 states to 7980 states and 12021 transitions. [2023-12-02 18:51:35,603 INFO L78 Accepts]: Start accepts. Automaton has 7980 states and 12021 transitions. Word has length 138 [2023-12-02 18:51:35,604 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:51:35,604 INFO L495 AbstractCegarLoop]: Abstraction has 7980 states and 12021 transitions. [2023-12-02 18:51:35,604 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 2 states have internal predecessors, (89), 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 18:51:35,604 INFO L276 IsEmpty]: Start isEmpty. Operand 7980 states and 12021 transitions. [2023-12-02 18:51:35,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2023-12-02 18:51:35,614 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:51:35,614 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 18:51:35,621 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2023-12-02 18:51:35,814 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:51:35,815 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 18:51:35,815 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:51:35,815 INFO L85 PathProgramCache]: Analyzing trace with hash -1366596466, now seen corresponding path program 1 times [2023-12-02 18:51:35,815 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:51:35,815 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1871764124] [2023-12-02 18:51:35,815 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:51:35,816 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:51:35,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:51:35,939 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-12-02 18:51:35,939 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:51:35,939 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1871764124] [2023-12-02 18:51:35,940 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1871764124] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 18:51:35,940 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [486918294] [2023-12-02 18:51:35,940 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:51:35,940 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:51:35,940 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 18:51:35,941 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 18:51:35,943 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-12-02 18:51:36,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:51:36,178 INFO L262 TraceCheckSpWp]: Trace formula consists of 1030 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 18:51:36,183 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 18:51:36,232 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 32 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-12-02 18:51:36,232 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 18:51:36,232 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [486918294] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 18:51:36,232 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 18:51:36,232 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-12-02 18:51:36,233 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [296911094] [2023-12-02 18:51:36,233 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 18:51:36,233 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 18:51:36,233 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:51:36,234 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 18:51:36,234 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 18:51:36,234 INFO L87 Difference]: Start difference. First operand 7980 states and 12021 transitions. Second operand has 3 states, 3 states have (on average 35.666666666666664) internal successors, (107), 2 states have internal predecessors, (107), 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 18:51:37,569 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:51:37,570 INFO L93 Difference]: Finished difference Result 22349 states and 35130 transitions. [2023-12-02 18:51:37,570 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 18:51:37,570 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 35.666666666666664) internal successors, (107), 2 states have internal predecessors, (107), 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 138 [2023-12-02 18:51:37,570 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:51:37,622 INFO L225 Difference]: With dead ends: 22349 [2023-12-02 18:51:37,622 INFO L226 Difference]: Without dead ends: 15104 [2023-12-02 18:51:37,652 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 138 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 18:51:37,653 INFO L413 NwaCegarLoop]: 328 mSDtfsCounter, 345 mSDsluCounter, 246 mSDsCounter, 0 mSdLazyCounter, 116 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 345 SdHoareTripleChecker+Valid, 574 SdHoareTripleChecker+Invalid, 118 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 116 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 18:51:37,653 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [345 Valid, 574 Invalid, 118 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 116 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 18:51:37,668 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15104 states. [2023-12-02 18:51:38,965 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15104 to 15060. [2023-12-02 18:51:38,976 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15060 states, 12787 states have (on average 1.4569484632830219) internal successors, (18630), 12849 states have internal predecessors, (18630), 1674 states have call successors, (1674), 580 states have call predecessors, (1674), 597 states have return successors, (2565), 1632 states have call predecessors, (2565), 1671 states have call successors, (2565) [2023-12-02 18:51:39,016 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15060 states to 15060 states and 22869 transitions. [2023-12-02 18:51:39,017 INFO L78 Accepts]: Start accepts. Automaton has 15060 states and 22869 transitions. Word has length 138 [2023-12-02 18:51:39,017 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:51:39,017 INFO L495 AbstractCegarLoop]: Abstraction has 15060 states and 22869 transitions. [2023-12-02 18:51:39,017 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 35.666666666666664) internal successors, (107), 2 states have internal predecessors, (107), 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 18:51:39,017 INFO L276 IsEmpty]: Start isEmpty. Operand 15060 states and 22869 transitions. [2023-12-02 18:51:39,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2023-12-02 18:51:39,031 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:51:39,031 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 18:51:39,036 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2023-12-02 18:51:39,231 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:51:39,232 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 18:51:39,232 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:51:39,232 INFO L85 PathProgramCache]: Analyzing trace with hash 1466949998, now seen corresponding path program 1 times [2023-12-02 18:51:39,232 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:51:39,232 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1401739784] [2023-12-02 18:51:39,232 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:51:39,232 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:51:39,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:51:39,326 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-12-02 18:51:39,326 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:51:39,326 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1401739784] [2023-12-02 18:51:39,326 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1401739784] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 18:51:39,326 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1981318733] [2023-12-02 18:51:39,326 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:51:39,326 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:51:39,326 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 18:51:39,327 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 18:51:39,328 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2023-12-02 18:51:39,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:51:39,521 INFO L262 TraceCheckSpWp]: Trace formula consists of 1024 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 18:51:39,523 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 18:51:39,555 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 26 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-12-02 18:51:39,555 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 18:51:39,555 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1981318733] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 18:51:39,556 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 18:51:39,556 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-12-02 18:51:39,556 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [409310348] [2023-12-02 18:51:39,556 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 18:51:39,556 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 18:51:39,556 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:51:39,557 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 18:51:39,557 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 18:51:39,557 INFO L87 Difference]: Start difference. First operand 15060 states and 22869 transitions. Second operand has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 2 states have internal predecessors, (101), 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 18:51:42,040 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:51:42,040 INFO L93 Difference]: Finished difference Result 43469 states and 68302 transitions. [2023-12-02 18:51:42,040 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 18:51:42,040 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 2 states have internal predecessors, (101), 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 138 [2023-12-02 18:51:42,040 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:51:42,110 INFO L225 Difference]: With dead ends: 43469 [2023-12-02 18:51:42,110 INFO L226 Difference]: Without dead ends: 29144 [2023-12-02 18:51:42,146 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 138 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 18:51:42,147 INFO L413 NwaCegarLoop]: 328 mSDtfsCounter, 351 mSDsluCounter, 246 mSDsCounter, 0 mSdLazyCounter, 116 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 351 SdHoareTripleChecker+Valid, 574 SdHoareTripleChecker+Invalid, 118 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 116 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 18:51:42,147 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [351 Valid, 574 Invalid, 118 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 116 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 18:51:42,173 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29144 states. [2023-12-02 18:51:44,444 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29144 to 29060. [2023-12-02 18:51:44,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29060 states, 24835 states have (on average 1.4588282665592913) internal successors, (36230), 24945 states have internal predecessors, (36230), 3146 states have call successors, (3146), 1060 states have call predecessors, (3146), 1077 states have return successors, (4837), 3056 states have call predecessors, (4837), 3143 states have call successors, (4837) [2023-12-02 18:51:44,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29060 states to 29060 states and 44213 transitions. [2023-12-02 18:51:44,535 INFO L78 Accepts]: Start accepts. Automaton has 29060 states and 44213 transitions. Word has length 138 [2023-12-02 18:51:44,536 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:51:44,536 INFO L495 AbstractCegarLoop]: Abstraction has 29060 states and 44213 transitions. [2023-12-02 18:51:44,536 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 2 states have internal predecessors, (101), 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 18:51:44,536 INFO L276 IsEmpty]: Start isEmpty. Operand 29060 states and 44213 transitions. [2023-12-02 18:51:44,560 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2023-12-02 18:51:44,561 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:51:44,561 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 18:51:44,566 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2023-12-02 18:51:44,761 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:51:44,761 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 18:51:44,762 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:51:44,762 INFO L85 PathProgramCache]: Analyzing trace with hash -1820641714, now seen corresponding path program 1 times [2023-12-02 18:51:44,762 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:51:44,762 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1191892088] [2023-12-02 18:51:44,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:51:44,762 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:51:44,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:51:44,846 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-12-02 18:51:44,847 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:51:44,847 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1191892088] [2023-12-02 18:51:44,847 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1191892088] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 18:51:44,847 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [426492849] [2023-12-02 18:51:44,847 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:51:44,847 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:51:44,847 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 18:51:44,848 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 18:51:44,849 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2023-12-02 18:51:45,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:51:45,049 INFO L262 TraceCheckSpWp]: Trace formula consists of 1018 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 18:51:45,052 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 18:51:45,100 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 35 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-12-02 18:51:45,100 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 18:51:45,100 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [426492849] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 18:51:45,100 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 18:51:45,100 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-12-02 18:51:45,100 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1723501906] [2023-12-02 18:51:45,101 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 18:51:45,101 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 18:51:45,101 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:51:45,101 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 18:51:45,102 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 18:51:45,102 INFO L87 Difference]: Start difference. First operand 29060 states and 44213 transitions. Second operand has 3 states, 3 states have (on average 36.666666666666664) internal successors, (110), 2 states have internal predecessors, (110), 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 18:51:49,786 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:51:49,786 INFO L93 Difference]: Finished difference Result 85229 states and 133518 transitions. [2023-12-02 18:51:49,787 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 18:51:49,787 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 36.666666666666664) internal successors, (110), 2 states have internal predecessors, (110), 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 138 [2023-12-02 18:51:49,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:51:49,901 INFO L225 Difference]: With dead ends: 85229 [2023-12-02 18:51:49,902 INFO L226 Difference]: Without dead ends: 56904 [2023-12-02 18:51:49,946 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 138 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 18:51:49,947 INFO L413 NwaCegarLoop]: 328 mSDtfsCounter, 342 mSDsluCounter, 246 mSDsCounter, 0 mSdLazyCounter, 116 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 342 SdHoareTripleChecker+Valid, 574 SdHoareTripleChecker+Invalid, 118 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 116 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 18:51:49,947 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [342 Valid, 574 Invalid, 118 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 116 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 18:51:49,984 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56904 states. [2023-12-02 18:51:54,657 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56904 to 56740. [2023-12-02 18:51:54,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56740 states, 48691 states have (on average 1.4571481382596374) internal successors, (70950), 48897 states have internal predecessors, (70950), 6010 states have call successors, (6010), 2020 states have call predecessors, (6010), 2037 states have return successors, (9237), 5824 states have call predecessors, (9237), 6007 states have call successors, (9237) [2023-12-02 18:51:54,833 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56740 states to 56740 states and 86197 transitions. [2023-12-02 18:51:54,836 INFO L78 Accepts]: Start accepts. Automaton has 56740 states and 86197 transitions. Word has length 138 [2023-12-02 18:51:54,836 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:51:54,836 INFO L495 AbstractCegarLoop]: Abstraction has 56740 states and 86197 transitions. [2023-12-02 18:51:54,836 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 36.666666666666664) internal successors, (110), 2 states have internal predecessors, (110), 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 18:51:54,836 INFO L276 IsEmpty]: Start isEmpty. Operand 56740 states and 86197 transitions. [2023-12-02 18:51:54,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2023-12-02 18:51:54,871 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:51:54,871 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 18:51:54,876 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2023-12-02 18:51:55,072 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2023-12-02 18:51:55,072 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 18:51:55,072 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:51:55,072 INFO L85 PathProgramCache]: Analyzing trace with hash -422386322, now seen corresponding path program 1 times [2023-12-02 18:51:55,072 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:51:55,073 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1219297676] [2023-12-02 18:51:55,073 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:51:55,073 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:51:55,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:51:55,503 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2023-12-02 18:51:55,504 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:51:55,504 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1219297676] [2023-12-02 18:51:55,504 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1219297676] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 18:51:55,504 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 18:51:55,504 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-12-02 18:51:55,504 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2089667311] [2023-12-02 18:51:55,504 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 18:51:55,505 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 18:51:55,505 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:51:55,505 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 18:51:55,505 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-12-02 18:51:55,506 INFO L87 Difference]: Start difference. First operand 56740 states and 86197 transitions. Second operand has 6 states, 6 states have (on average 13.333333333333334) internal successors, (80), 6 states have internal predecessors, (80), 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 18:52:05,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:52:05,458 INFO L93 Difference]: Finished difference Result 180268 states and 277947 transitions. [2023-12-02 18:52:05,459 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-12-02 18:52:05,459 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.333333333333334) internal successors, (80), 6 states have internal predecessors, (80), 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 138 [2023-12-02 18:52:05,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:52:05,842 INFO L225 Difference]: With dead ends: 180268 [2023-12-02 18:52:05,842 INFO L226 Difference]: Without dead ends: 124264 [2023-12-02 18:52:05,921 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=85, Unknown=0, NotChecked=0, Total=132 [2023-12-02 18:52:05,921 INFO L413 NwaCegarLoop]: 330 mSDtfsCounter, 964 mSDsluCounter, 764 mSDsCounter, 0 mSdLazyCounter, 556 mSolverCounterSat, 129 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 995 SdHoareTripleChecker+Valid, 1094 SdHoareTripleChecker+Invalid, 685 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 129 IncrementalHoareTripleChecker+Valid, 556 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-12-02 18:52:05,921 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [995 Valid, 1094 Invalid, 685 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [129 Valid, 556 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-12-02 18:52:06,011 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124264 states. [2023-12-02 18:52:15,493 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124264 to 110820. [2023-12-02 18:52:15,545 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110820 states, 95283 states have (on average 1.4532497927227312) internal successors, (138470), 95681 states have internal predecessors, (138470), 11578 states have call successors, (11578), 3940 states have call predecessors, (11578), 3957 states have return successors, (17749), 11200 states have call predecessors, (17749), 11575 states have call successors, (17749) [2023-12-02 18:52:15,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110820 states to 110820 states and 167797 transitions. [2023-12-02 18:52:15,866 INFO L78 Accepts]: Start accepts. Automaton has 110820 states and 167797 transitions. Word has length 138 [2023-12-02 18:52:15,866 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:52:15,867 INFO L495 AbstractCegarLoop]: Abstraction has 110820 states and 167797 transitions. [2023-12-02 18:52:15,867 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.333333333333334) internal successors, (80), 6 states have internal predecessors, (80), 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 18:52:15,867 INFO L276 IsEmpty]: Start isEmpty. Operand 110820 states and 167797 transitions. [2023-12-02 18:52:15,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2023-12-02 18:52:15,931 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:52:15,931 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 18:52:15,931 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2023-12-02 18:52:15,931 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 18:52:15,932 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:52:15,932 INFO L85 PathProgramCache]: Analyzing trace with hash 1692435706, now seen corresponding path program 1 times [2023-12-02 18:52:15,932 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:52:15,932 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1686502431] [2023-12-02 18:52:15,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:52:15,932 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:52:15,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:52:16,128 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 10 proven. 41 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-12-02 18:52:16,128 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:52:16,128 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1686502431] [2023-12-02 18:52:16,128 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1686502431] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 18:52:16,128 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [435591212] [2023-12-02 18:52:16,129 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:52:16,129 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:52:16,129 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 18:52:16,130 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 18:52:16,132 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2023-12-02 18:52:16,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:52:16,375 INFO L262 TraceCheckSpWp]: Trace formula consists of 1052 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 18:52:16,379 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 18:52:16,409 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 28 proven. 0 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2023-12-02 18:52:16,409 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 18:52:16,409 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [435591212] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 18:52:16,409 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 18:52:16,409 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-12-02 18:52:16,410 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [441530546] [2023-12-02 18:52:16,410 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 18:52:16,410 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 18:52:16,410 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:52:16,411 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 18:52:16,411 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 18:52:16,411 INFO L87 Difference]: Start difference. First operand 110820 states and 167797 transitions. Second operand has 3 states, 3 states have (on average 32.666666666666664) internal successors, (98), 3 states have internal predecessors, (98), 3 states have call successors, (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 18:52:28,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:52:28,100 INFO L93 Difference]: Finished difference Result 225128 states and 348216 transitions. [2023-12-02 18:52:28,101 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 18:52:28,101 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 32.666666666666664) internal successors, (98), 3 states have internal predecessors, (98), 3 states have call successors, (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 161 [2023-12-02 18:52:28,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:52:28,446 INFO L225 Difference]: With dead ends: 225128 [2023-12-02 18:52:28,447 INFO L226 Difference]: Without dead ends: 136804 [2023-12-02 18:52:28,584 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 163 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 18:52:28,584 INFO L413 NwaCegarLoop]: 472 mSDtfsCounter, 138 mSDsluCounter, 340 mSDsCounter, 0 mSdLazyCounter, 156 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 138 SdHoareTripleChecker+Valid, 812 SdHoareTripleChecker+Invalid, 156 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 156 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 18:52:28,584 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [138 Valid, 812 Invalid, 156 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 156 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 18:52:28,675 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136804 states. [2023-12-02 18:52:39,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136804 to 129892. [2023-12-02 18:52:39,880 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 129892 states, 113843 states have (on average 1.4782990609875004) internal successors, (168294), 114241 states have internal predecessors, (168294), 11834 states have call successors, (11834), 4196 states have call predecessors, (11834), 4213 states have return successors, (18005), 11456 states have call predecessors, (18005), 11831 states have call successors, (18005) [2023-12-02 18:52:40,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129892 states to 129892 states and 198133 transitions. [2023-12-02 18:52:40,213 INFO L78 Accepts]: Start accepts. Automaton has 129892 states and 198133 transitions. Word has length 161 [2023-12-02 18:52:40,213 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:52:40,213 INFO L495 AbstractCegarLoop]: Abstraction has 129892 states and 198133 transitions. [2023-12-02 18:52:40,213 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 32.666666666666664) internal successors, (98), 3 states have internal predecessors, (98), 3 states have call successors, (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 18:52:40,213 INFO L276 IsEmpty]: Start isEmpty. Operand 129892 states and 198133 transitions. [2023-12-02 18:52:40,343 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 213 [2023-12-02 18:52:40,343 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:52:40,343 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, 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 18:52:40,348 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2023-12-02 18:52:40,544 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2023-12-02 18:52:40,544 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 18:52:40,544 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:52:40,545 INFO L85 PathProgramCache]: Analyzing trace with hash -1407022110, now seen corresponding path program 1 times [2023-12-02 18:52:40,545 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:52:40,545 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [849924402] [2023-12-02 18:52:40,545 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:52:40,545 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:52:40,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:52:40,797 INFO L134 CoverageAnalysis]: Checked inductivity of 159 backedges. 10 proven. 81 refuted. 0 times theorem prover too weak. 68 trivial. 0 not checked. [2023-12-02 18:52:40,797 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:52:40,797 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [849924402] [2023-12-02 18:52:40,797 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [849924402] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 18:52:40,797 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [299223868] [2023-12-02 18:52:40,797 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:52:40,798 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:52:40,798 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 18:52:40,798 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 18:52:40,801 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2023-12-02 18:52:41,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:52:41,012 INFO L262 TraceCheckSpWp]: Trace formula consists of 1315 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 18:52:41,016 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 18:52:41,138 INFO L134 CoverageAnalysis]: Checked inductivity of 159 backedges. 99 proven. 0 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2023-12-02 18:52:41,138 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 18:52:41,138 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [299223868] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 18:52:41,138 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 18:52:41,138 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [6] total 7 [2023-12-02 18:52:41,139 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1041757473] [2023-12-02 18:52:41,139 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 18:52:41,139 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 18:52:41,139 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:52:41,140 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 18:52:41,140 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 18:52:41,140 INFO L87 Difference]: Start difference. First operand 129892 states and 198133 transitions. Second operand has 3 states, 3 states have (on average 45.0) internal successors, (135), 2 states have internal predecessors, (135), 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 18:53:01,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:53:01,223 INFO L93 Difference]: Finished difference Result 386285 states and 601662 transitions. [2023-12-02 18:53:01,224 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 18:53:01,224 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 45.0) internal successors, (135), 2 states have internal predecessors, (135), 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 212 [2023-12-02 18:53:01,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:53:02,000 INFO L225 Difference]: With dead ends: 386285 [2023-12-02 18:53:02,001 INFO L226 Difference]: Without dead ends: 257128 [2023-12-02 18:53:02,198 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 219 GetRequests, 214 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 18:53:02,198 INFO L413 NwaCegarLoop]: 341 mSDtfsCounter, 292 mSDsluCounter, 246 mSDsCounter, 0 mSdLazyCounter, 119 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 292 SdHoareTripleChecker+Valid, 587 SdHoareTripleChecker+Invalid, 121 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 119 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 18:53:02,198 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [292 Valid, 587 Invalid, 121 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 119 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 18:53:02,369 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 257128 states. [2023-12-02 18:53:23,947 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 257128 to 256228. [2023-12-02 18:53:24,087 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 256228 states, 225011 states have (on average 1.4740879334788077) internal successors, (331686), 225793 states have internal predecessors, (331686), 22906 states have call successors, (22906), 8292 states have call predecessors, (22906), 8309 states have return successors, (34709), 22144 states have call predecessors, (34709), 22903 states have call successors, (34709) [2023-12-02 18:53:25,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 256228 states to 256228 states and 389301 transitions. [2023-12-02 18:53:25,558 INFO L78 Accepts]: Start accepts. Automaton has 256228 states and 389301 transitions. Word has length 212 [2023-12-02 18:53:25,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:53:25,558 INFO L495 AbstractCegarLoop]: Abstraction has 256228 states and 389301 transitions. [2023-12-02 18:53:25,559 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 45.0) internal successors, (135), 2 states have internal predecessors, (135), 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 18:53:25,559 INFO L276 IsEmpty]: Start isEmpty. Operand 256228 states and 389301 transitions. [2023-12-02 18:53:25,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 213 [2023-12-02 18:53:25,914 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:53:25,914 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, 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 18:53:25,919 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2023-12-02 18:53:26,114 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2023-12-02 18:53:26,115 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 18:53:26,115 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:53:26,115 INFO L85 PathProgramCache]: Analyzing trace with hash 1516554743, now seen corresponding path program 1 times [2023-12-02 18:53:26,115 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:53:26,115 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [139355619] [2023-12-02 18:53:26,115 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:53:26,115 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:53:26,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:53:26,546 INFO L134 CoverageAnalysis]: Checked inductivity of 159 backedges. 10 proven. 81 refuted. 0 times theorem prover too weak. 68 trivial. 0 not checked. [2023-12-02 18:53:26,546 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:53:26,546 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [139355619] [2023-12-02 18:53:26,546 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [139355619] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 18:53:26,546 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1676997423] [2023-12-02 18:53:26,547 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:53:26,547 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:53:26,547 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 18:53:26,548 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 18:53:26,549 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2023-12-02 18:53:26,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:53:26,800 INFO L262 TraceCheckSpWp]: Trace formula consists of 1315 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 18:53:26,805 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 18:53:26,937 INFO L134 CoverageAnalysis]: Checked inductivity of 159 backedges. 102 proven. 0 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2023-12-02 18:53:26,937 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 18:53:26,937 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1676997423] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 18:53:26,937 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 18:53:26,938 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [6] total 7 [2023-12-02 18:53:26,938 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1436013784] [2023-12-02 18:53:26,938 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 18:53:26,938 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 18:53:26,938 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:53:26,939 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 18:53:26,939 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 18:53:26,939 INFO L87 Difference]: Start difference. First operand 256228 states and 389301 transitions. Second operand has 3 states, 3 states have (on average 46.0) internal successors, (138), 2 states have internal predecessors, (138), 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 18:54:08,505 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:54:08,506 INFO L93 Difference]: Finished difference Result 763373 states and 1182910 transitions. [2023-12-02 18:54:08,506 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 18:54:08,506 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 46.0) internal successors, (138), 2 states have internal predecessors, (138), 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 212 [2023-12-02 18:54:08,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:54:09,967 INFO L225 Difference]: With dead ends: 763373 [2023-12-02 18:54:09,967 INFO L226 Difference]: Without dead ends: 507880 [2023-12-02 18:54:10,596 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 219 GetRequests, 214 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 18:54:10,597 INFO L413 NwaCegarLoop]: 328 mSDtfsCounter, 292 mSDsluCounter, 246 mSDsCounter, 0 mSdLazyCounter, 116 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 292 SdHoareTripleChecker+Valid, 574 SdHoareTripleChecker+Invalid, 118 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 116 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 18:54:10,597 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [292 Valid, 574 Invalid, 118 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 116 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 18:54:10,934 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 507880 states. [2023-12-02 18:54:53,256 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 507880 to 506084. [2023-12-02 18:54:53,620 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 506084 states, 445171 states have (on average 1.4693634580868924) internal successors, (654118), 446721 states have internal predecessors, (654118), 44410 states have call successors, (44410), 16484 states have call predecessors, (44410), 16501 states have return successors, (66965), 42880 states have call predecessors, (66965), 44407 states have call successors, (66965) [2023-12-02 18:54:56,232 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 506084 states to 506084 states and 765493 transitions. [2023-12-02 18:54:56,248 INFO L78 Accepts]: Start accepts. Automaton has 506084 states and 765493 transitions. Word has length 212 [2023-12-02 18:54:56,248 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:54:56,248 INFO L495 AbstractCegarLoop]: Abstraction has 506084 states and 765493 transitions. [2023-12-02 18:54:56,249 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 46.0) internal successors, (138), 2 states have internal predecessors, (138), 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 18:54:56,249 INFO L276 IsEmpty]: Start isEmpty. Operand 506084 states and 765493 transitions. [2023-12-02 18:54:57,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 213 [2023-12-02 18:54:57,245 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:54:57,245 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, 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 18:54:57,252 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2023-12-02 18:54:57,446 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:54:57,446 INFO L420 AbstractCegarLoop]: === Iteration 31 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 18:54:57,447 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:54:57,447 INFO L85 PathProgramCache]: Analyzing trace with hash -235570184, now seen corresponding path program 1 times [2023-12-02 18:54:57,447 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:54:57,447 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [944515185] [2023-12-02 18:54:57,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:54:57,447 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:54:57,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:54:57,673 INFO L134 CoverageAnalysis]: Checked inductivity of 159 backedges. 10 proven. 81 refuted. 0 times theorem prover too weak. 68 trivial. 0 not checked. [2023-12-02 18:54:57,673 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:54:57,673 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [944515185] [2023-12-02 18:54:57,673 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [944515185] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 18:54:57,673 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [539226220] [2023-12-02 18:54:57,673 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:54:57,673 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:54:57,673 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 18:54:57,674 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 18:54:57,679 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bccc5800-1022-42ad-99f0-c43e332c0b7e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2023-12-02 18:54:57,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:54:57,928 INFO L262 TraceCheckSpWp]: Trace formula consists of 1315 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 18:54:57,933 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 18:54:58,056 INFO L134 CoverageAnalysis]: Checked inductivity of 159 backedges. 104 proven. 0 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2023-12-02 18:54:58,056 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 18:54:58,057 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [539226220] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 18:54:58,057 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 18:54:58,057 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [6] total 7 [2023-12-02 18:54:58,057 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [3742704] [2023-12-02 18:54:58,057 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 18:54:58,057 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 18:54:58,057 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:54:58,058 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 18:54:58,058 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 18:54:58,058 INFO L87 Difference]: Start difference. First operand 506084 states and 765493 transitions. Second operand has 3 states, 3 states have (on average 46.666666666666664) internal successors, (140), 2 states have internal predecessors, (140), 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 18:56:16,444 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:56:16,445 INFO L93 Difference]: Finished difference Result 1509101 states and 2325822 transitions. [2023-12-02 18:56:16,445 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 18:56:16,445 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 46.666666666666664) internal successors, (140), 2 states have internal predecessors, (140), 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 212 [2023-12-02 18:56:16,446 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:56:19,786 INFO L225 Difference]: With dead ends: 1509101 [2023-12-02 18:56:19,786 INFO L226 Difference]: Without dead ends: 1003752 [2023-12-02 18:56:21,207 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 219 GetRequests, 214 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 18:56:21,207 INFO L413 NwaCegarLoop]: 328 mSDtfsCounter, 292 mSDsluCounter, 246 mSDsCounter, 0 mSdLazyCounter, 116 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 292 SdHoareTripleChecker+Valid, 574 SdHoareTripleChecker+Invalid, 118 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 116 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 18:56:21,207 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [292 Valid, 574 Invalid, 118 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 116 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 18:56:21,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1003752 states.