./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/systemc/pc_sfifo_2.cil-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 527bcce2 Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffb3fd34-5edb-433e-bf80-250be794c3cc/bin/utaipan-verify-QoSU8krkJ5/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffb3fd34-5edb-433e-bf80-250be794c3cc/bin/utaipan-verify-QoSU8krkJ5/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffb3fd34-5edb-433e-bf80-250be794c3cc/bin/utaipan-verify-QoSU8krkJ5/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffb3fd34-5edb-433e-bf80-250be794c3cc/bin/utaipan-verify-QoSU8krkJ5/config/TaipanReach.xml -i ../../sv-benchmarks/c/systemc/pc_sfifo_2.cil-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffb3fd34-5edb-433e-bf80-250be794c3cc/bin/utaipan-verify-QoSU8krkJ5/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffb3fd34-5edb-433e-bf80-250be794c3cc/bin/utaipan-verify-QoSU8krkJ5 --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 b74079121634b4e5d8b815834e604eed77442466d93875e78a8cab3fe135fa1f --- Real Ultimate output --- This is Ultimate 0.2.3-dev-527bcce [2023-11-21 19:45:20,564 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-21 19:45:20,674 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffb3fd34-5edb-433e-bf80-250be794c3cc/bin/utaipan-verify-QoSU8krkJ5/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-21 19:45:20,687 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-21 19:45:20,688 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-21 19:45:20,729 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-21 19:45:20,730 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-21 19:45:20,730 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-21 19:45:20,731 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-21 19:45:20,739 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-21 19:45:20,739 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-21 19:45:20,741 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-21 19:45:20,741 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-21 19:45:20,743 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-21 19:45:20,743 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-21 19:45:20,744 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-21 19:45:20,744 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-21 19:45:20,745 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-21 19:45:20,745 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-21 19:45:20,746 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-21 19:45:20,746 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-21 19:45:20,747 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-21 19:45:20,748 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-21 19:45:20,749 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-21 19:45:20,749 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-21 19:45:20,749 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-21 19:45:20,750 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-21 19:45:20,750 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-21 19:45:20,751 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-21 19:45:20,751 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-21 19:45:20,752 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-21 19:45:20,753 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-21 19:45:20,753 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-21 19:45:20,753 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-21 19:45:20,754 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-21 19:45:20,754 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-21 19:45:20,754 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-21 19:45:20,754 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-21 19:45:20,755 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-21 19:45:20,756 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-21 19:45:20,756 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-21 19:45:20,756 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-21 19:45:20,757 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-21 19:45:20,757 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-21 19:45:20,758 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-21 19:45:20,758 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-21 19:45:20,758 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-21 19:45:20,758 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_ffb3fd34-5edb-433e-bf80-250be794c3cc/bin/utaipan-verify-QoSU8krkJ5/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffb3fd34-5edb-433e-bf80-250be794c3cc/bin/utaipan-verify-QoSU8krkJ5 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> b74079121634b4e5d8b815834e604eed77442466d93875e78a8cab3fe135fa1f [2023-11-21 19:45:21,035 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-21 19:45:21,072 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-21 19:45:21,074 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-21 19:45:21,077 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-21 19:45:21,077 INFO L274 PluginConnector]: CDTParser initialized [2023-11-21 19:45:21,079 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffb3fd34-5edb-433e-bf80-250be794c3cc/bin/utaipan-verify-QoSU8krkJ5/../../sv-benchmarks/c/systemc/pc_sfifo_2.cil-1.c [2023-11-21 19:45:24,241 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-21 19:45:24,447 INFO L384 CDTParser]: Found 1 translation units. [2023-11-21 19:45:24,448 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffb3fd34-5edb-433e-bf80-250be794c3cc/sv-benchmarks/c/systemc/pc_sfifo_2.cil-1.c [2023-11-21 19:45:24,459 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffb3fd34-5edb-433e-bf80-250be794c3cc/bin/utaipan-verify-QoSU8krkJ5/data/f0aa77205/44e358c2ae4a477ea3006286f1f86854/FLAG737b021b7 [2023-11-21 19:45:24,474 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffb3fd34-5edb-433e-bf80-250be794c3cc/bin/utaipan-verify-QoSU8krkJ5/data/f0aa77205/44e358c2ae4a477ea3006286f1f86854 [2023-11-21 19:45:24,477 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-21 19:45:24,479 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-21 19:45:24,480 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-21 19:45:24,480 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-21 19:45:24,486 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-21 19:45:24,487 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 07:45:24" (1/1) ... [2023-11-21 19:45:24,488 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@21bc67c5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:45:24, skipping insertion in model container [2023-11-21 19:45:24,488 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 07:45:24" (1/1) ... [2023-11-21 19:45:24,524 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-21 19:45:24,693 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_ffb3fd34-5edb-433e-bf80-250be794c3cc/sv-benchmarks/c/systemc/pc_sfifo_2.cil-1.c[643,656] [2023-11-21 19:45:24,747 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-21 19:45:24,759 INFO L202 MainTranslator]: Completed pre-run [2023-11-21 19:45:24,772 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_ffb3fd34-5edb-433e-bf80-250be794c3cc/sv-benchmarks/c/systemc/pc_sfifo_2.cil-1.c[643,656] [2023-11-21 19:45:24,798 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-21 19:45:24,815 INFO L206 MainTranslator]: Completed translation [2023-11-21 19:45:24,815 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:45:24 WrapperNode [2023-11-21 19:45:24,815 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-21 19:45:24,816 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-21 19:45:24,816 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-21 19:45:24,816 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-21 19:45:24,822 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:45:24" (1/1) ... [2023-11-21 19:45:24,830 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:45:24" (1/1) ... [2023-11-21 19:45:24,854 INFO L138 Inliner]: procedures = 29, calls = 31, calls flagged for inlining = 10, calls inlined = 10, statements flattened = 189 [2023-11-21 19:45:24,854 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-21 19:45:24,855 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-21 19:45:24,855 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-21 19:45:24,855 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-21 19:45:24,863 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:45:24" (1/1) ... [2023-11-21 19:45:24,863 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:45:24" (1/1) ... [2023-11-21 19:45:24,866 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:45:24" (1/1) ... [2023-11-21 19:45:24,866 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:45:24" (1/1) ... [2023-11-21 19:45:24,873 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:45:24" (1/1) ... [2023-11-21 19:45:24,878 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:45:24" (1/1) ... [2023-11-21 19:45:24,880 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:45:24" (1/1) ... [2023-11-21 19:45:24,882 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:45:24" (1/1) ... [2023-11-21 19:45:24,886 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-21 19:45:24,887 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-21 19:45:24,887 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-21 19:45:24,887 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-21 19:45:24,888 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:45:24" (1/1) ... [2023-11-21 19:45:24,900 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-21 19:45:24,944 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffb3fd34-5edb-433e-bf80-250be794c3cc/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:45:24,959 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffb3fd34-5edb-433e-bf80-250be794c3cc/bin/utaipan-verify-QoSU8krkJ5/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-21 19:45:24,972 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffb3fd34-5edb-433e-bf80-250be794c3cc/bin/utaipan-verify-QoSU8krkJ5/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-21 19:45:24,998 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-21 19:45:24,999 INFO L130 BoogieDeclarations]: Found specification of procedure error [2023-11-21 19:45:24,999 INFO L138 BoogieDeclarations]: Found implementation of procedure error [2023-11-21 19:45:24,999 INFO L130 BoogieDeclarations]: Found specification of procedure is_do_read_c_triggered [2023-11-21 19:45:24,999 INFO L138 BoogieDeclarations]: Found implementation of procedure is_do_read_c_triggered [2023-11-21 19:45:24,999 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2023-11-21 19:45:24,999 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2023-11-21 19:45:25,000 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2023-11-21 19:45:25,000 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2023-11-21 19:45:25,000 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2023-11-21 19:45:25,000 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2023-11-21 19:45:25,000 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2023-11-21 19:45:25,000 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2023-11-21 19:45:25,001 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-21 19:45:25,001 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2023-11-21 19:45:25,001 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2023-11-21 19:45:25,001 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-21 19:45:25,001 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-21 19:45:25,002 INFO L130 BoogieDeclarations]: Found specification of procedure is_do_write_p_triggered [2023-11-21 19:45:25,002 INFO L138 BoogieDeclarations]: Found implementation of procedure is_do_write_p_triggered [2023-11-21 19:45:25,077 INFO L240 CfgBuilder]: Building ICFG [2023-11-21 19:45:25,079 INFO L266 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-21 19:45:25,413 INFO L281 CfgBuilder]: Performing block encoding [2023-11-21 19:45:25,563 INFO L303 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-21 19:45:25,563 INFO L308 CfgBuilder]: Removed 4 assume(true) statements. [2023-11-21 19:45:25,565 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 07:45:25 BoogieIcfgContainer [2023-11-21 19:45:25,565 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-21 19:45:25,568 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-21 19:45:25,568 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-21 19:45:25,572 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-21 19:45:25,572 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 07:45:24" (1/3) ... [2023-11-21 19:45:25,573 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6b25ba50 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 07:45:25, skipping insertion in model container [2023-11-21 19:45:25,573 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:45:24" (2/3) ... [2023-11-21 19:45:25,573 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6b25ba50 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 07:45:25, skipping insertion in model container [2023-11-21 19:45:25,573 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 07:45:25" (3/3) ... [2023-11-21 19:45:25,575 INFO L112 eAbstractionObserver]: Analyzing ICFG pc_sfifo_2.cil-1.c [2023-11-21 19:45:25,594 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-21 19:45:25,595 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-21 19:45:25,646 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-21 19:45:25,658 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;@3f12028a, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-21 19:45:25,658 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-21 19:45:25,662 INFO L276 IsEmpty]: Start isEmpty. Operand has 72 states, 48 states have (on average 1.4791666666666667) internal successors, (71), 52 states have internal predecessors, (71), 14 states have call successors, (14), 8 states have call predecessors, (14), 8 states have return successors, (14), 13 states have call predecessors, (14), 14 states have call successors, (14) [2023-11-21 19:45:25,672 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2023-11-21 19:45:25,672 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:45:25,673 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] [2023-11-21 19:45:25,673 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:45:25,678 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:45:25,678 INFO L85 PathProgramCache]: Analyzing trace with hash -1967912658, now seen corresponding path program 1 times [2023-11-21 19:45:25,685 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:45:25,686 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [486479466] [2023-11-21 19:45:25,686 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:45:25,687 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:45:25,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:45:26,028 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:45:26,029 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:45:26,029 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [486479466] [2023-11-21 19:45:26,030 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [486479466] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:45:26,030 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:45:26,031 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-21 19:45:26,032 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [631454679] [2023-11-21 19:45:26,033 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:45:26,038 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-21 19:45:26,038 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:45:26,065 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-21 19:45:26,066 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-21 19:45:26,069 INFO L87 Difference]: Start difference. First operand has 72 states, 48 states have (on average 1.4791666666666667) internal successors, (71), 52 states have internal predecessors, (71), 14 states have call successors, (14), 8 states have call predecessors, (14), 8 states have return successors, (14), 13 states have call predecessors, (14), 14 states have call successors, (14) Second operand has 4 states, 4 states have (on average 7.25) internal successors, (29), 4 states have internal predecessors, (29), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 3 states have call predecessors, (7), 4 states have call successors, (7) [2023-11-21 19:45:26,359 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:45:26,360 INFO L93 Difference]: Finished difference Result 201 states and 279 transitions. [2023-11-21 19:45:26,361 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-21 19:45:26,362 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 7.25) internal successors, (29), 4 states have internal predecessors, (29), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 3 states have call predecessors, (7), 4 states have call successors, (7) Word has length 44 [2023-11-21 19:45:26,363 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:45:26,375 INFO L225 Difference]: With dead ends: 201 [2023-11-21 19:45:26,375 INFO L226 Difference]: Without dead ends: 130 [2023-11-21 19:45:26,380 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 [2023-11-21 19:45:26,387 INFO L413 NwaCegarLoop]: 133 mSDtfsCounter, 155 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 116 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 155 SdHoareTripleChecker+Valid, 220 SdHoareTripleChecker+Invalid, 129 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 116 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-21 19:45:26,389 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [155 Valid, 220 Invalid, 129 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 116 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-21 19:45:26,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2023-11-21 19:45:26,439 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 123. [2023-11-21 19:45:26,441 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 86 states have (on average 1.3372093023255813) internal successors, (115), 88 states have internal predecessors, (115), 22 states have call successors, (22), 15 states have call predecessors, (22), 14 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2023-11-21 19:45:26,443 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 157 transitions. [2023-11-21 19:45:26,445 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 157 transitions. Word has length 44 [2023-11-21 19:45:26,445 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:45:26,446 INFO L495 AbstractCegarLoop]: Abstraction has 123 states and 157 transitions. [2023-11-21 19:45:26,446 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 7.25) internal successors, (29), 4 states have internal predecessors, (29), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 3 states have call predecessors, (7), 4 states have call successors, (7) [2023-11-21 19:45:26,446 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 157 transitions. [2023-11-21 19:45:26,449 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2023-11-21 19:45:26,449 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:45:26,449 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] [2023-11-21 19:45:26,449 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-21 19:45:26,450 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:45:26,450 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:45:26,451 INFO L85 PathProgramCache]: Analyzing trace with hash -1048938035, now seen corresponding path program 1 times [2023-11-21 19:45:26,451 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:45:26,451 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [989516869] [2023-11-21 19:45:26,451 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:45:26,452 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:45:26,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:45:26,599 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:45:26,600 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:45:26,600 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [989516869] [2023-11-21 19:45:26,600 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [989516869] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:45:26,600 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:45:26,601 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-21 19:45:26,601 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1001905585] [2023-11-21 19:45:26,601 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:45:26,602 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-21 19:45:26,603 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:45:26,603 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-21 19:45:26,604 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-21 19:45:26,604 INFO L87 Difference]: Start difference. First operand 123 states and 157 transitions. Second operand has 4 states, 4 states have (on average 7.25) internal successors, (29), 4 states have internal predecessors, (29), 3 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 4 states have call predecessors, (7), 3 states have call successors, (7) [2023-11-21 19:45:26,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:45:26,796 INFO L93 Difference]: Finished difference Result 352 states and 452 transitions. [2023-11-21 19:45:26,796 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-21 19:45:26,796 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 7.25) internal successors, (29), 4 states have internal predecessors, (29), 3 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 4 states have call predecessors, (7), 3 states have call successors, (7) Word has length 44 [2023-11-21 19:45:26,797 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:45:26,805 INFO L225 Difference]: With dead ends: 352 [2023-11-21 19:45:26,805 INFO L226 Difference]: Without dead ends: 234 [2023-11-21 19:45:26,810 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 [2023-11-21 19:45:26,814 INFO L413 NwaCegarLoop]: 133 mSDtfsCounter, 149 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 100 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 149 SdHoareTripleChecker+Valid, 220 SdHoareTripleChecker+Invalid, 107 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 100 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-21 19:45:26,815 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [149 Valid, 220 Invalid, 107 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 100 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-21 19:45:26,819 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 234 states. [2023-11-21 19:45:26,870 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 234 to 220. [2023-11-21 19:45:26,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 220 states, 153 states have (on average 1.2483660130718954) internal successors, (191), 155 states have internal predecessors, (191), 38 states have call successors, (38), 29 states have call predecessors, (38), 28 states have return successors, (36), 36 states have call predecessors, (36), 36 states have call successors, (36) [2023-11-21 19:45:26,873 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 220 states to 220 states and 265 transitions. [2023-11-21 19:45:26,873 INFO L78 Accepts]: Start accepts. Automaton has 220 states and 265 transitions. Word has length 44 [2023-11-21 19:45:26,873 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:45:26,874 INFO L495 AbstractCegarLoop]: Abstraction has 220 states and 265 transitions. [2023-11-21 19:45:26,874 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 7.25) internal successors, (29), 4 states have internal predecessors, (29), 3 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 4 states have call predecessors, (7), 3 states have call successors, (7) [2023-11-21 19:45:26,874 INFO L276 IsEmpty]: Start isEmpty. Operand 220 states and 265 transitions. [2023-11-21 19:45:26,877 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2023-11-21 19:45:26,879 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:45:26,879 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] [2023-11-21 19:45:26,880 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-21 19:45:26,880 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:45:26,881 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:45:26,881 INFO L85 PathProgramCache]: Analyzing trace with hash 1449104608, now seen corresponding path program 1 times [2023-11-21 19:45:26,882 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:45:26,882 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1823416396] [2023-11-21 19:45:26,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:45:26,883 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:45:26,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:45:27,265 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:45:27,265 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:45:27,265 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1823416396] [2023-11-21 19:45:27,266 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1823416396] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:45:27,266 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:45:27,266 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2023-11-21 19:45:27,266 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1489400647] [2023-11-21 19:45:27,266 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:45:27,267 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-21 19:45:27,267 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:45:27,268 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-21 19:45:27,268 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2023-11-21 19:45:27,268 INFO L87 Difference]: Start difference. First operand 220 states and 265 transitions. Second operand has 8 states, 7 states have (on average 4.285714285714286) internal successors, (30), 7 states have internal predecessors, (30), 4 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 4 states have call predecessors, (7), 3 states have call successors, (7) [2023-11-21 19:45:27,700 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:45:27,700 INFO L93 Difference]: Finished difference Result 552 states and 657 transitions. [2023-11-21 19:45:27,700 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-11-21 19:45:27,701 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 4.285714285714286) internal successors, (30), 7 states have internal predecessors, (30), 4 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 4 states have call predecessors, (7), 3 states have call successors, (7) Word has length 45 [2023-11-21 19:45:27,701 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:45:27,706 INFO L225 Difference]: With dead ends: 552 [2023-11-21 19:45:27,706 INFO L226 Difference]: Without dead ends: 338 [2023-11-21 19:45:27,708 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=82, Invalid=190, Unknown=0, NotChecked=0, Total=272 [2023-11-21 19:45:27,710 INFO L413 NwaCegarLoop]: 63 mSDtfsCounter, 197 mSDsluCounter, 197 mSDsCounter, 0 mSdLazyCounter, 253 mSolverCounterSat, 66 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 203 SdHoareTripleChecker+Valid, 260 SdHoareTripleChecker+Invalid, 319 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 66 IncrementalHoareTripleChecker+Valid, 253 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-21 19:45:27,711 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [203 Valid, 260 Invalid, 319 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [66 Valid, 253 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-21 19:45:27,712 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 338 states. [2023-11-21 19:45:27,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 338 to 316. [2023-11-21 19:45:27,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 316 states, 219 states have (on average 1.2283105022831051) internal successors, (269), 221 states have internal predecessors, (269), 54 states have call successors, (54), 43 states have call predecessors, (54), 42 states have return successors, (52), 52 states have call predecessors, (52), 52 states have call successors, (52) [2023-11-21 19:45:27,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 316 states to 316 states and 375 transitions. [2023-11-21 19:45:27,760 INFO L78 Accepts]: Start accepts. Automaton has 316 states and 375 transitions. Word has length 45 [2023-11-21 19:45:27,761 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:45:27,761 INFO L495 AbstractCegarLoop]: Abstraction has 316 states and 375 transitions. [2023-11-21 19:45:27,761 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 4.285714285714286) internal successors, (30), 7 states have internal predecessors, (30), 4 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 4 states have call predecessors, (7), 3 states have call successors, (7) [2023-11-21 19:45:27,762 INFO L276 IsEmpty]: Start isEmpty. Operand 316 states and 375 transitions. [2023-11-21 19:45:27,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2023-11-21 19:45:27,763 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:45:27,763 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] [2023-11-21 19:45:27,764 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-21 19:45:27,764 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:45:27,764 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:45:27,765 INFO L85 PathProgramCache]: Analyzing trace with hash -1638783382, now seen corresponding path program 1 times [2023-11-21 19:45:27,765 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:45:27,765 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [119204817] [2023-11-21 19:45:27,765 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:45:27,766 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:45:27,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:45:27,816 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:45:27,816 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:45:27,816 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [119204817] [2023-11-21 19:45:27,816 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [119204817] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:45:27,817 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:45:27,817 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-21 19:45:27,817 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [567449157] [2023-11-21 19:45:27,817 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:45:27,818 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-21 19:45:27,818 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:45:27,819 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-21 19:45:27,819 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-21 19:45:27,819 INFO L87 Difference]: Start difference. First operand 316 states and 375 transitions. Second operand has 3 states, 3 states have (on average 10.333333333333334) internal successors, (31), 3 states have internal predecessors, (31), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-21 19:45:27,915 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:45:27,915 INFO L93 Difference]: Finished difference Result 687 states and 816 transitions. [2023-11-21 19:45:27,916 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-21 19:45:27,916 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 10.333333333333334) internal successors, (31), 3 states have internal predecessors, (31), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 46 [2023-11-21 19:45:27,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:45:27,920 INFO L225 Difference]: With dead ends: 687 [2023-11-21 19:45:27,921 INFO L226 Difference]: Without dead ends: 423 [2023-11-21 19:45:27,922 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 [2023-11-21 19:45:27,924 INFO L413 NwaCegarLoop]: 80 mSDtfsCounter, 67 mSDsluCounter, 53 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 133 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-21 19:45:27,924 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [67 Valid, 133 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-21 19:45:27,926 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 423 states. [2023-11-21 19:45:28,017 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 423 to 415. [2023-11-21 19:45:28,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 415 states, 288 states have (on average 1.2222222222222223) internal successors, (352), 290 states have internal predecessors, (352), 70 states have call successors, (70), 57 states have call predecessors, (70), 56 states have return successors, (68), 68 states have call predecessors, (68), 68 states have call successors, (68) [2023-11-21 19:45:28,021 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 415 states to 415 states and 490 transitions. [2023-11-21 19:45:28,022 INFO L78 Accepts]: Start accepts. Automaton has 415 states and 490 transitions. Word has length 46 [2023-11-21 19:45:28,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:45:28,022 INFO L495 AbstractCegarLoop]: Abstraction has 415 states and 490 transitions. [2023-11-21 19:45:28,023 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 10.333333333333334) internal successors, (31), 3 states have internal predecessors, (31), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-21 19:45:28,023 INFO L276 IsEmpty]: Start isEmpty. Operand 415 states and 490 transitions. [2023-11-21 19:45:28,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2023-11-21 19:45:28,025 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:45:28,025 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] [2023-11-21 19:45:28,025 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-21 19:45:28,026 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:45:28,026 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:45:28,026 INFO L85 PathProgramCache]: Analyzing trace with hash 1034186750, now seen corresponding path program 1 times [2023-11-21 19:45:28,027 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:45:28,027 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [63905958] [2023-11-21 19:45:28,027 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:45:28,027 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:45:28,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:45:28,103 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:45:28,104 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:45:28,104 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [63905958] [2023-11-21 19:45:28,104 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [63905958] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:45:28,104 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:45:28,104 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-21 19:45:28,105 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2067575743] [2023-11-21 19:45:28,105 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:45:28,105 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-21 19:45:28,106 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:45:28,106 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-21 19:45:28,107 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-21 19:45:28,107 INFO L87 Difference]: Start difference. First operand 415 states and 490 transitions. Second operand has 4 states, 4 states have (on average 9.5) internal successors, (38), 4 states have internal predecessors, (38), 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) [2023-11-21 19:45:28,294 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:45:28,294 INFO L93 Difference]: Finished difference Result 520 states and 611 transitions. [2023-11-21 19:45:28,295 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-21 19:45:28,295 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 9.5) internal successors, (38), 4 states have internal predecessors, (38), 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 53 [2023-11-21 19:45:28,296 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:45:28,299 INFO L225 Difference]: With dead ends: 520 [2023-11-21 19:45:28,299 INFO L226 Difference]: Without dead ends: 517 [2023-11-21 19:45:28,300 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 [2023-11-21 19:45:28,301 INFO L413 NwaCegarLoop]: 77 mSDtfsCounter, 164 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 52 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 164 SdHoareTripleChecker+Valid, 119 SdHoareTripleChecker+Invalid, 96 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 52 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-21 19:45:28,302 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [164 Valid, 119 Invalid, 96 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [52 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-21 19:45:28,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 517 states. [2023-11-21 19:45:28,365 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 517 to 414. [2023-11-21 19:45:28,366 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 414 states, 288 states have (on average 1.2118055555555556) internal successors, (349), 289 states have internal predecessors, (349), 69 states have call successors, (69), 57 states have call predecessors, (69), 56 states have return successors, (68), 68 states have call predecessors, (68), 68 states have call successors, (68) [2023-11-21 19:45:28,369 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 414 states to 414 states and 486 transitions. [2023-11-21 19:45:28,370 INFO L78 Accepts]: Start accepts. Automaton has 414 states and 486 transitions. Word has length 53 [2023-11-21 19:45:28,370 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:45:28,370 INFO L495 AbstractCegarLoop]: Abstraction has 414 states and 486 transitions. [2023-11-21 19:45:28,371 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 9.5) internal successors, (38), 4 states have internal predecessors, (38), 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) [2023-11-21 19:45:28,371 INFO L276 IsEmpty]: Start isEmpty. Operand 414 states and 486 transitions. [2023-11-21 19:45:28,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2023-11-21 19:45:28,373 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:45:28,373 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] [2023-11-21 19:45:28,373 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-11-21 19:45:28,374 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:45:28,374 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:45:28,374 INFO L85 PathProgramCache]: Analyzing trace with hash 1994666323, now seen corresponding path program 1 times [2023-11-21 19:45:28,374 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:45:28,375 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1803824871] [2023-11-21 19:45:28,375 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:45:28,375 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:45:28,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:45:28,521 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:45:28,521 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:45:28,522 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1803824871] [2023-11-21 19:45:28,522 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1803824871] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:45:28,522 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1483259239] [2023-11-21 19:45:28,522 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:45:28,523 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:45:28,523 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffb3fd34-5edb-433e-bf80-250be794c3cc/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:45:28,525 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffb3fd34-5edb-433e-bf80-250be794c3cc/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:45:28,536 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffb3fd34-5edb-433e-bf80-250be794c3cc/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-21 19:45:28,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:45:28,658 INFO L262 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 9 conjunts are in the unsatisfiable core [2023-11-21 19:45:28,667 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:45:29,043 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:45:29,044 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:45:29,131 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:45:29,132 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1483259239] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:45:29,132 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1861158336] [2023-11-21 19:45:29,153 INFO L159 IcfgInterpreter]: Started Sifa with 53 locations of interest [2023-11-21 19:45:29,154 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:45:29,158 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-21 19:45:29,163 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-21 19:45:29,164 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-21 19:45:30,799 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events with input of size 67 for LOIs [2023-11-21 19:45:30,828 INFO L197 IcfgInterpreter]: Interpreting procedure fire_delta_events with input of size 67 for LOIs [2023-11-21 19:45:30,859 INFO L197 IcfgInterpreter]: Interpreting procedure update_channels with input of size 74 for LOIs [2023-11-21 19:45:30,887 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread with input of size 63 for LOIs [2023-11-21 19:45:30,931 INFO L197 IcfgInterpreter]: Interpreting procedure activate_threads with input of size 71 for LOIs [2023-11-21 19:45:31,207 INFO L197 IcfgInterpreter]: Interpreting procedure is_do_write_p_triggered with input of size 67 for LOIs [2023-11-21 19:45:31,256 INFO L197 IcfgInterpreter]: Interpreting procedure is_do_read_c_triggered with input of size 67 for LOIs [2023-11-21 19:45:31,302 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-21 19:45:36,230 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [1861158336] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:45:36,231 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2023-11-21 19:45:36,231 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [5, 4, 4] total 40 [2023-11-21 19:45:36,232 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [597095740] [2023-11-21 19:45:36,232 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:45:36,232 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2023-11-21 19:45:36,233 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:45:36,234 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2023-11-21 19:45:36,235 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=189, Invalid=1371, Unknown=0, NotChecked=0, Total=1560 [2023-11-21 19:45:36,235 INFO L87 Difference]: Start difference. First operand 414 states and 486 transitions. Second operand has 35 states, 25 states have (on average 1.52) internal successors, (38), 25 states have internal predecessors, (38), 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) [2023-11-21 19:45:43,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:45:43,900 INFO L93 Difference]: Finished difference Result 870 states and 1014 transitions. [2023-11-21 19:45:43,901 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2023-11-21 19:45:43,901 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 25 states have (on average 1.52) internal successors, (38), 25 states have internal predecessors, (38), 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 54 [2023-11-21 19:45:43,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:45:43,906 INFO L225 Difference]: With dead ends: 870 [2023-11-21 19:45:43,906 INFO L226 Difference]: Without dead ends: 462 [2023-11-21 19:45:43,913 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 124 SyntacticMatches, 3 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1419 ImplicationChecksByTransitivity, 10.3s TimeCoverageRelationStatistics Valid=597, Invalid=3959, Unknown=0, NotChecked=0, Total=4556 [2023-11-21 19:45:43,920 INFO L413 NwaCegarLoop]: 47 mSDtfsCounter, 180 mSDsluCounter, 472 mSDsCounter, 0 mSdLazyCounter, 1912 mSolverCounterSat, 145 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 182 SdHoareTripleChecker+Valid, 519 SdHoareTripleChecker+Invalid, 2057 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 145 IncrementalHoareTripleChecker+Valid, 1912 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2023-11-21 19:45:43,921 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [182 Valid, 519 Invalid, 2057 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [145 Valid, 1912 Invalid, 0 Unknown, 0 Unchecked, 2.1s Time] [2023-11-21 19:45:43,924 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 462 states. [2023-11-21 19:45:43,997 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 462 to 447. [2023-11-21 19:45:43,998 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 447 states, 313 states have (on average 1.1980830670926517) internal successors, (375), 314 states have internal predecessors, (375), 71 states have call successors, (71), 63 states have call predecessors, (71), 62 states have return successors, (70), 70 states have call predecessors, (70), 70 states have call successors, (70) [2023-11-21 19:45:44,003 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 447 states to 447 states and 516 transitions. [2023-11-21 19:45:44,004 INFO L78 Accepts]: Start accepts. Automaton has 447 states and 516 transitions. Word has length 54 [2023-11-21 19:45:44,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:45:44,007 INFO L495 AbstractCegarLoop]: Abstraction has 447 states and 516 transitions. [2023-11-21 19:45:44,007 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 25 states have (on average 1.52) internal successors, (38), 25 states have internal predecessors, (38), 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) [2023-11-21 19:45:44,007 INFO L276 IsEmpty]: Start isEmpty. Operand 447 states and 516 transitions. [2023-11-21 19:45:44,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2023-11-21 19:45:44,010 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:45:44,011 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] [2023-11-21 19:45:44,036 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffb3fd34-5edb-433e-bf80-250be794c3cc/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-21 19:45:44,224 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffb3fd34-5edb-433e-bf80-250be794c3cc/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:45:44,225 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:45:44,225 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:45:44,225 INFO L85 PathProgramCache]: Analyzing trace with hash -1389927462, now seen corresponding path program 1 times [2023-11-21 19:45:44,225 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:45:44,225 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1466889977] [2023-11-21 19:45:44,225 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:45:44,226 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:45:44,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:45:44,321 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-21 19:45:44,321 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:45:44,322 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1466889977] [2023-11-21 19:45:44,322 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1466889977] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:45:44,322 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:45:44,322 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-21 19:45:44,322 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [509115011] [2023-11-21 19:45:44,322 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:45:44,324 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-21 19:45:44,324 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:45:44,325 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-21 19:45:44,325 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-21 19:45:44,325 INFO L87 Difference]: Start difference. First operand 447 states and 516 transitions. Second operand has 3 states, 3 states have (on average 14.0) internal successors, (42), 3 states have internal predecessors, (42), 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) [2023-11-21 19:45:44,435 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:45:44,435 INFO L93 Difference]: Finished difference Result 892 states and 1042 transitions. [2023-11-21 19:45:44,436 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-21 19:45:44,436 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 14.0) internal successors, (42), 3 states have internal predecessors, (42), 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 60 [2023-11-21 19:45:44,437 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:45:44,441 INFO L225 Difference]: With dead ends: 892 [2023-11-21 19:45:44,441 INFO L226 Difference]: Without dead ends: 631 [2023-11-21 19:45:44,442 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 [2023-11-21 19:45:44,443 INFO L413 NwaCegarLoop]: 112 mSDtfsCounter, 43 mSDsluCounter, 70 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 182 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-21 19:45:44,444 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [43 Valid, 182 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-21 19:45:44,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 631 states. [2023-11-21 19:45:44,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 631 to 502. [2023-11-21 19:45:44,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 502 states, 358 states have (on average 1.2122905027932962) internal successors, (434), 359 states have internal predecessors, (434), 76 states have call successors, (76), 68 states have call predecessors, (76), 67 states have return successors, (75), 75 states have call predecessors, (75), 75 states have call successors, (75) [2023-11-21 19:45:44,525 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 502 states to 502 states and 585 transitions. [2023-11-21 19:45:44,525 INFO L78 Accepts]: Start accepts. Automaton has 502 states and 585 transitions. Word has length 60 [2023-11-21 19:45:44,525 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:45:44,526 INFO L495 AbstractCegarLoop]: Abstraction has 502 states and 585 transitions. [2023-11-21 19:45:44,526 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 14.0) internal successors, (42), 3 states have internal predecessors, (42), 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) [2023-11-21 19:45:44,526 INFO L276 IsEmpty]: Start isEmpty. Operand 502 states and 585 transitions. [2023-11-21 19:45:44,528 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2023-11-21 19:45:44,529 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:45:44,529 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] [2023-11-21 19:45:44,529 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2023-11-21 19:45:44,529 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:45:44,530 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:45:44,530 INFO L85 PathProgramCache]: Analyzing trace with hash 2067977750, now seen corresponding path program 1 times [2023-11-21 19:45:44,530 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:45:44,531 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [370527020] [2023-11-21 19:45:44,531 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:45:44,531 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:45:44,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:45:44,742 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-21 19:45:44,742 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:45:44,742 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [370527020] [2023-11-21 19:45:44,742 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [370527020] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:45:44,742 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:45:44,743 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2023-11-21 19:45:44,743 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1506494705] [2023-11-21 19:45:44,743 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:45:44,743 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-21 19:45:44,744 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:45:44,744 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-21 19:45:44,747 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2023-11-21 19:45:44,747 INFO L87 Difference]: Start difference. First operand 502 states and 585 transitions. Second operand has 8 states, 7 states have (on average 6.142857142857143) internal successors, (43), 7 states have internal predecessors, (43), 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) [2023-11-21 19:45:45,146 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:45:45,146 INFO L93 Difference]: Finished difference Result 1181 states and 1377 transitions. [2023-11-21 19:45:45,147 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-11-21 19:45:45,147 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 6.142857142857143) internal successors, (43), 7 states have internal predecessors, (43), 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 62 [2023-11-21 19:45:45,148 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:45:45,152 INFO L225 Difference]: With dead ends: 1181 [2023-11-21 19:45:45,153 INFO L226 Difference]: Without dead ends: 766 [2023-11-21 19:45:45,154 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=82, Invalid=190, Unknown=0, NotChecked=0, Total=272 [2023-11-21 19:45:45,155 INFO L413 NwaCegarLoop]: 52 mSDtfsCounter, 175 mSDsluCounter, 210 mSDsCounter, 0 mSdLazyCounter, 254 mSolverCounterSat, 73 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 180 SdHoareTripleChecker+Valid, 262 SdHoareTripleChecker+Invalid, 327 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 73 IncrementalHoareTripleChecker+Valid, 254 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-21 19:45:45,156 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [180 Valid, 262 Invalid, 327 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [73 Valid, 254 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-21 19:45:45,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 766 states. [2023-11-21 19:45:45,243 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 766 to 731. [2023-11-21 19:45:45,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 731 states, 512 states have (on average 1.1953125) internal successors, (612), 513 states have internal predecessors, (612), 116 states have call successors, (116), 103 states have call predecessors, (116), 102 states have return successors, (115), 115 states have call predecessors, (115), 115 states have call successors, (115) [2023-11-21 19:45:45,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 731 states to 731 states and 843 transitions. [2023-11-21 19:45:45,250 INFO L78 Accepts]: Start accepts. Automaton has 731 states and 843 transitions. Word has length 62 [2023-11-21 19:45:45,250 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:45:45,250 INFO L495 AbstractCegarLoop]: Abstraction has 731 states and 843 transitions. [2023-11-21 19:45:45,251 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 6.142857142857143) internal successors, (43), 7 states have internal predecessors, (43), 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) [2023-11-21 19:45:45,251 INFO L276 IsEmpty]: Start isEmpty. Operand 731 states and 843 transitions. [2023-11-21 19:45:45,252 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2023-11-21 19:45:45,252 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:45:45,252 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] [2023-11-21 19:45:45,252 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2023-11-21 19:45:45,253 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:45:45,253 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:45:45,253 INFO L85 PathProgramCache]: Analyzing trace with hash -143130135, now seen corresponding path program 1 times [2023-11-21 19:45:45,253 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:45:45,254 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [818420281] [2023-11-21 19:45:45,254 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:45:45,254 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:45:45,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:45:45,368 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-21 19:45:45,368 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:45:45,368 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [818420281] [2023-11-21 19:45:45,369 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [818420281] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:45:45,369 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [574889] [2023-11-21 19:45:45,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:45:45,369 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:45:45,370 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffb3fd34-5edb-433e-bf80-250be794c3cc/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:45:45,371 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffb3fd34-5edb-433e-bf80-250be794c3cc/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:45:45,400 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffb3fd34-5edb-433e-bf80-250be794c3cc/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-21 19:45:45,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:45:45,466 INFO L262 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 9 conjunts are in the unsatisfiable core [2023-11-21 19:45:45,473 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:45:45,700 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-21 19:45:45,701 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:45:45,798 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-21 19:45:45,798 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [574889] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:45:45,798 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1634483965] [2023-11-21 19:45:45,802 INFO L159 IcfgInterpreter]: Started Sifa with 53 locations of interest [2023-11-21 19:45:45,802 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:45:45,803 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-21 19:45:45,803 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-21 19:45:45,804 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-21 19:45:48,471 INFO L197 IcfgInterpreter]: Interpreting procedure error with input of size 86 for LOIs [2023-11-21 19:45:48,549 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events with input of size 67 for LOIs [2023-11-21 19:45:48,572 INFO L197 IcfgInterpreter]: Interpreting procedure fire_delta_events with input of size 67 for LOIs [2023-11-21 19:45:48,596 INFO L197 IcfgInterpreter]: Interpreting procedure update_channels with input of size 74 for LOIs [2023-11-21 19:45:48,618 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread with input of size 36 for LOIs [2023-11-21 19:45:48,632 INFO L197 IcfgInterpreter]: Interpreting procedure activate_threads with input of size 71 for LOIs [2023-11-21 19:45:48,850 INFO L197 IcfgInterpreter]: Interpreting procedure is_do_write_p_triggered with input of size 67 for LOIs [2023-11-21 19:45:48,892 INFO L197 IcfgInterpreter]: Interpreting procedure is_do_read_c_triggered with input of size 67 for LOIs [2023-11-21 19:45:48,935 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-21 19:45:55,290 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12383#(and (= ~q_req_up~0 1) (= ~q_free~0 1) (not (= ~c_num_read~0 ~p_num_write~0)) (= ~c_last_read~0 ~q_buf_0~0) (= ~c_dr_pc~0 0) (exists ((|v_ULTIMATE.start_start_simulation_~kernel_st~0#1_BEFORE_CALL_36| Int) (v_~q_free~0_37 Int) (v_~c_last_read~0_12 Int) (|v_ULTIMATE.start_eval_~tmp___1~0#1_BEFORE_CALL_11| Int) (|v_ULTIMATE.start_eval_~tmp___0~2#1_BEFORE_CALL_11| Int) (v_~c_dr_st~0_55 Int)) (and (<= 0 (+ 2147483648 |v_ULTIMATE.start_eval_~tmp___0~2#1_BEFORE_CALL_11|)) (<= 1 |#StackHeapBarrier|) (<= ~q_buf_0~0 2147483647) (<= ~p_dw_pc~0 1) (= v_~c_last_read~0_12 0) (<= 0 ~p_dw_pc~0) (<= 0 ~p_num_write~0) (= 1 ~c_dr_i~0) (= |v_ULTIMATE.start_start_simulation_~kernel_st~0#1_BEFORE_CALL_36| 1) (= v_~c_dr_st~0_55 0) (= ~c_num_read~0 1) (<= 0 |v_ULTIMATE.start_eval_~tmp___1~0#1_BEFORE_CALL_11|) (<= ~p_num_write~0 1) (<= 0 (+ ~q_buf_0~0 2147483648)) (<= v_~q_free~0_37 1) (= ~p_dw_i~0 1) (not (= |v_ULTIMATE.start_eval_~tmp___0~2#1_BEFORE_CALL_11| 0)) (= ~a_t~0 0) (<= |v_ULTIMATE.start_eval_~tmp___1~0#1_BEFORE_CALL_11| 1) (<= |v_ULTIMATE.start_eval_~tmp___0~2#1_BEFORE_CALL_11| 2147483647) (<= 0 v_~q_free~0_37) (not (= v_~q_free~0_37 1)))) (= ~c_last_read~0 ~p_last_write~0) (= ~c_dr_st~0 1))' at error location [2023-11-21 19:45:55,291 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-21 19:45:55,291 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 19:45:55,291 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 4] total 7 [2023-11-21 19:45:55,291 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [240684593] [2023-11-21 19:45:55,291 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 19:45:55,292 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-21 19:45:55,292 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:45:55,292 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-21 19:45:55,294 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=231, Invalid=1749, Unknown=0, NotChecked=0, Total=1980 [2023-11-21 19:45:55,294 INFO L87 Difference]: Start difference. First operand 731 states and 843 transitions. Second operand has 7 states, 7 states have (on average 12.714285714285714) internal successors, (89), 7 states have internal predecessors, (89), 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) [2023-11-21 19:45:55,757 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:45:55,757 INFO L93 Difference]: Finished difference Result 2048 states and 2377 transitions. [2023-11-21 19:45:55,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-21 19:45:55,758 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 12.714285714285714) internal successors, (89), 7 states have internal predecessors, (89), 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 63 [2023-11-21 19:45:55,758 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:45:55,769 INFO L225 Difference]: With dead ends: 2048 [2023-11-21 19:45:55,769 INFO L226 Difference]: Without dead ends: 2045 [2023-11-21 19:45:55,771 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 145 SyntacticMatches, 4 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 970 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=231, Invalid=1749, Unknown=0, NotChecked=0, Total=1980 [2023-11-21 19:45:55,773 INFO L413 NwaCegarLoop]: 174 mSDtfsCounter, 257 mSDsluCounter, 416 mSDsCounter, 0 mSdLazyCounter, 380 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 257 SdHoareTripleChecker+Valid, 590 SdHoareTripleChecker+Invalid, 381 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 380 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-21 19:45:55,774 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [257 Valid, 590 Invalid, 381 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 380 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-21 19:45:55,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2045 states. [2023-11-21 19:45:55,979 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2045 to 1455. [2023-11-21 19:45:55,982 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1455 states, 1014 states have (on average 1.2061143984220908) internal successors, (1223), 1015 states have internal predecessors, (1223), 234 states have call successors, (234), 207 states have call predecessors, (234), 206 states have return successors, (233), 233 states have call predecessors, (233), 233 states have call successors, (233) [2023-11-21 19:45:55,989 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1455 states to 1455 states and 1690 transitions. [2023-11-21 19:45:55,989 INFO L78 Accepts]: Start accepts. Automaton has 1455 states and 1690 transitions. Word has length 63 [2023-11-21 19:45:55,990 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:45:55,990 INFO L495 AbstractCegarLoop]: Abstraction has 1455 states and 1690 transitions. [2023-11-21 19:45:55,990 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 12.714285714285714) internal successors, (89), 7 states have internal predecessors, (89), 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) [2023-11-21 19:45:55,990 INFO L276 IsEmpty]: Start isEmpty. Operand 1455 states and 1690 transitions. [2023-11-21 19:45:55,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2023-11-21 19:45:55,992 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:45:55,992 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] [2023-11-21 19:45:56,013 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffb3fd34-5edb-433e-bf80-250be794c3cc/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-21 19:45:56,212 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffb3fd34-5edb-433e-bf80-250be794c3cc/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:45:56,212 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:45:56,213 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:45:56,213 INFO L85 PathProgramCache]: Analyzing trace with hash 298214366, now seen corresponding path program 2 times [2023-11-21 19:45:56,213 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:45:56,213 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1765846882] [2023-11-21 19:45:56,213 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:45:56,213 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:45:56,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:45:56,265 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-21 19:45:56,265 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:45:56,265 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1765846882] [2023-11-21 19:45:56,265 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1765846882] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:45:56,265 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:45:56,266 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-21 19:45:56,266 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1924677147] [2023-11-21 19:45:56,266 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:45:56,266 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-21 19:45:56,267 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:45:56,267 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-21 19:45:56,267 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-21 19:45:56,268 INFO L87 Difference]: Start difference. First operand 1455 states and 1690 transitions. Second operand has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 3 states have internal predecessors, (47), 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) [2023-11-21 19:45:56,438 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:45:56,438 INFO L93 Difference]: Finished difference Result 2219 states and 2582 transitions. [2023-11-21 19:45:56,439 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-21 19:45:56,439 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 3 states have internal predecessors, (47), 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 66 [2023-11-21 19:45:56,439 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:45:56,446 INFO L225 Difference]: With dead ends: 2219 [2023-11-21 19:45:56,446 INFO L226 Difference]: Without dead ends: 1053 [2023-11-21 19:45:56,449 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 [2023-11-21 19:45:56,450 INFO L413 NwaCegarLoop]: 120 mSDtfsCounter, 65 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 187 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-21 19:45:56,450 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [65 Valid, 187 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-21 19:45:56,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1053 states. [2023-11-21 19:45:56,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1053 to 1039. [2023-11-21 19:45:56,585 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1039 states, 726 states have (on average 1.184573002754821) internal successors, (860), 727 states have internal predecessors, (860), 166 states have call successors, (166), 147 states have call predecessors, (166), 146 states have return successors, (165), 165 states have call predecessors, (165), 165 states have call successors, (165) [2023-11-21 19:45:56,590 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1039 states to 1039 states and 1191 transitions. [2023-11-21 19:45:56,591 INFO L78 Accepts]: Start accepts. Automaton has 1039 states and 1191 transitions. Word has length 66 [2023-11-21 19:45:56,591 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:45:56,591 INFO L495 AbstractCegarLoop]: Abstraction has 1039 states and 1191 transitions. [2023-11-21 19:45:56,592 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 3 states have internal predecessors, (47), 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) [2023-11-21 19:45:56,592 INFO L276 IsEmpty]: Start isEmpty. Operand 1039 states and 1191 transitions. [2023-11-21 19:45:56,593 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2023-11-21 19:45:56,593 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:45:56,594 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] [2023-11-21 19:45:56,594 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2023-11-21 19:45:56,594 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:45:56,594 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:45:56,595 INFO L85 PathProgramCache]: Analyzing trace with hash -1055940592, now seen corresponding path program 1 times [2023-11-21 19:45:56,595 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:45:56,595 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2082049918] [2023-11-21 19:45:56,595 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:45:56,595 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:45:56,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:45:56,642 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 15 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-21 19:45:56,643 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:45:56,643 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2082049918] [2023-11-21 19:45:56,643 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2082049918] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:45:56,643 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:45:56,643 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-21 19:45:56,644 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2041784748] [2023-11-21 19:45:56,644 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:45:56,644 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-21 19:45:56,644 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:45:56,645 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-21 19:45:56,645 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-21 19:45:56,645 INFO L87 Difference]: Start difference. First operand 1039 states and 1191 transitions. Second operand has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 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) [2023-11-21 19:45:56,819 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:45:56,819 INFO L93 Difference]: Finished difference Result 2066 states and 2383 transitions. [2023-11-21 19:45:56,820 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-21 19:45:56,820 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 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 70 [2023-11-21 19:45:56,820 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:45:56,827 INFO L225 Difference]: With dead ends: 2066 [2023-11-21 19:45:56,827 INFO L226 Difference]: Without dead ends: 1213 [2023-11-21 19:45:56,830 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 [2023-11-21 19:45:56,831 INFO L413 NwaCegarLoop]: 105 mSDtfsCounter, 38 mSDsluCounter, 70 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 175 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-21 19:45:56,831 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [38 Valid, 175 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-21 19:45:56,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1213 states. [2023-11-21 19:45:57,046 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1213 to 1084. [2023-11-21 19:45:57,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1084 states, 763 states have (on average 1.182175622542595) internal successors, (902), 764 states have internal predecessors, (902), 170 states have call successors, (170), 151 states have call predecessors, (170), 150 states have return successors, (169), 169 states have call predecessors, (169), 169 states have call successors, (169) [2023-11-21 19:45:57,056 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1084 states to 1084 states and 1241 transitions. [2023-11-21 19:45:57,057 INFO L78 Accepts]: Start accepts. Automaton has 1084 states and 1241 transitions. Word has length 70 [2023-11-21 19:45:57,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:45:57,057 INFO L495 AbstractCegarLoop]: Abstraction has 1084 states and 1241 transitions. [2023-11-21 19:45:57,058 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 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) [2023-11-21 19:45:57,058 INFO L276 IsEmpty]: Start isEmpty. Operand 1084 states and 1241 transitions. [2023-11-21 19:45:57,060 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2023-11-21 19:45:57,060 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:45:57,061 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:45:57,061 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2023-11-21 19:45:57,061 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:45:57,062 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:45:57,062 INFO L85 PathProgramCache]: Analyzing trace with hash 1509618852, now seen corresponding path program 1 times [2023-11-21 19:45:57,062 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:45:57,062 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1899669550] [2023-11-21 19:45:57,062 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:45:57,063 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:45:57,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:45:57,449 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 15 proven. 14 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2023-11-21 19:45:57,449 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:45:57,450 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1899669550] [2023-11-21 19:45:57,450 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1899669550] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:45:57,450 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [196624009] [2023-11-21 19:45:57,450 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:45:57,450 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:45:57,451 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffb3fd34-5edb-433e-bf80-250be794c3cc/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:45:57,453 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffb3fd34-5edb-433e-bf80-250be794c3cc/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:45:57,476 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffb3fd34-5edb-433e-bf80-250be794c3cc/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-21 19:45:57,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:45:57,567 INFO L262 TraceCheckSpWp]: Trace formula consists of 363 conjuncts, 7 conjunts are in the unsatisfiable core [2023-11-21 19:45:57,583 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:45:57,652 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 49 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-21 19:45:57,652 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-21 19:45:57,652 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [196624009] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:45:57,652 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-21 19:45:57,653 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [14] total 17 [2023-11-21 19:45:57,653 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1142639206] [2023-11-21 19:45:57,653 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:45:57,654 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-21 19:45:57,654 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:45:57,654 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-21 19:45:57,655 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=232, Unknown=0, NotChecked=0, Total=272 [2023-11-21 19:45:57,655 INFO L87 Difference]: Start difference. First operand 1084 states and 1241 transitions. Second operand has 6 states, 5 states have (on average 13.4) internal successors, (67), 5 states have internal predecessors, (67), 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) [2023-11-21 19:45:57,879 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:45:57,879 INFO L93 Difference]: Finished difference Result 1969 states and 2295 transitions. [2023-11-21 19:45:57,880 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-21 19:45:57,880 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 13.4) internal successors, (67), 5 states have internal predecessors, (67), 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 101 [2023-11-21 19:45:57,880 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:45:57,886 INFO L225 Difference]: With dead ends: 1969 [2023-11-21 19:45:57,886 INFO L226 Difference]: Without dead ends: 913 [2023-11-21 19:45:57,889 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 101 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=321, Unknown=0, NotChecked=0, Total=380 [2023-11-21 19:45:57,890 INFO L413 NwaCegarLoop]: 118 mSDtfsCounter, 57 mSDsluCounter, 322 mSDsCounter, 0 mSdLazyCounter, 99 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 440 SdHoareTripleChecker+Invalid, 100 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 99 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-21 19:45:57,890 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [59 Valid, 440 Invalid, 100 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 99 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-21 19:45:57,892 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 913 states. [2023-11-21 19:45:58,001 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 913 to 716. [2023-11-21 19:45:58,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 716 states, 527 states have (on average 1.1821631878557874) internal successors, (623), 528 states have internal predecessors, (623), 99 states have call successors, (99), 90 states have call predecessors, (99), 89 states have return successors, (98), 98 states have call predecessors, (98), 98 states have call successors, (98) [2023-11-21 19:45:58,006 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 716 states to 716 states and 820 transitions. [2023-11-21 19:45:58,007 INFO L78 Accepts]: Start accepts. Automaton has 716 states and 820 transitions. Word has length 101 [2023-11-21 19:45:58,007 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:45:58,007 INFO L495 AbstractCegarLoop]: Abstraction has 716 states and 820 transitions. [2023-11-21 19:45:58,008 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 13.4) internal successors, (67), 5 states have internal predecessors, (67), 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) [2023-11-21 19:45:58,008 INFO L276 IsEmpty]: Start isEmpty. Operand 716 states and 820 transitions. [2023-11-21 19:45:58,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2023-11-21 19:45:58,010 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:45:58,010 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] [2023-11-21 19:45:58,033 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffb3fd34-5edb-433e-bf80-250be794c3cc/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-21 19:45:58,231 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffb3fd34-5edb-433e-bf80-250be794c3cc/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2023-11-21 19:45:58,231 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:45:58,231 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:45:58,232 INFO L85 PathProgramCache]: Analyzing trace with hash -1103083302, now seen corresponding path program 1 times [2023-11-21 19:45:58,232 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:45:58,232 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [472295036] [2023-11-21 19:45:58,232 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:45:58,232 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:45:58,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:45:58,455 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 25 proven. 7 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2023-11-21 19:45:58,455 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:45:58,456 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [472295036] [2023-11-21 19:45:58,456 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [472295036] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:45:58,456 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [129232426] [2023-11-21 19:45:58,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:45:58,456 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:45:58,457 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffb3fd34-5edb-433e-bf80-250be794c3cc/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:45:58,461 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffb3fd34-5edb-433e-bf80-250be794c3cc/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:45:58,480 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffb3fd34-5edb-433e-bf80-250be794c3cc/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-21 19:45:58,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:45:58,573 INFO L262 TraceCheckSpWp]: Trace formula consists of 398 conjuncts, 8 conjunts are in the unsatisfiable core [2023-11-21 19:45:58,583 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:45:58,677 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 55 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-21 19:45:58,677 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-21 19:45:58,677 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [129232426] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:45:58,677 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-21 19:45:58,678 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [8] total 13 [2023-11-21 19:45:58,680 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1980609906] [2023-11-21 19:45:58,681 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:45:58,681 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-21 19:45:58,681 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:45:58,682 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-21 19:45:58,683 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2023-11-21 19:45:58,683 INFO L87 Difference]: Start difference. First operand 716 states and 820 transitions. Second operand has 7 states, 6 states have (on average 12.666666666666666) internal successors, (76), 6 states have internal predecessors, (76), 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) [2023-11-21 19:45:58,979 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:45:58,979 INFO L93 Difference]: Finished difference Result 1290 states and 1488 transitions. [2023-11-21 19:45:58,980 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-21 19:45:58,980 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 12.666666666666666) internal successors, (76), 6 states have internal predecessors, (76), 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 111 [2023-11-21 19:45:58,980 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:45:58,984 INFO L225 Difference]: With dead ends: 1290 [2023-11-21 19:45:58,984 INFO L226 Difference]: Without dead ends: 670 [2023-11-21 19:45:58,986 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 110 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2023-11-21 19:45:58,987 INFO L413 NwaCegarLoop]: 118 mSDtfsCounter, 63 mSDsluCounter, 470 mSDsCounter, 0 mSdLazyCounter, 198 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 64 SdHoareTripleChecker+Valid, 588 SdHoareTripleChecker+Invalid, 200 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 198 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-21 19:45:58,988 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [64 Valid, 588 Invalid, 200 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 198 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-21 19:45:58,989 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 670 states. [2023-11-21 19:45:59,076 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 670 to 578. [2023-11-21 19:45:59,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 578 states, 425 states have (on average 1.1764705882352942) internal successors, (500), 426 states have internal predecessors, (500), 80 states have call successors, (80), 73 states have call predecessors, (80), 72 states have return successors, (79), 79 states have call predecessors, (79), 79 states have call successors, (79) [2023-11-21 19:45:59,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 578 states to 578 states and 659 transitions. [2023-11-21 19:45:59,080 INFO L78 Accepts]: Start accepts. Automaton has 578 states and 659 transitions. Word has length 111 [2023-11-21 19:45:59,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:45:59,081 INFO L495 AbstractCegarLoop]: Abstraction has 578 states and 659 transitions. [2023-11-21 19:45:59,081 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 12.666666666666666) internal successors, (76), 6 states have internal predecessors, (76), 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) [2023-11-21 19:45:59,081 INFO L276 IsEmpty]: Start isEmpty. Operand 578 states and 659 transitions. [2023-11-21 19:45:59,086 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2023-11-21 19:45:59,087 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:45:59,087 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] [2023-11-21 19:45:59,113 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffb3fd34-5edb-433e-bf80-250be794c3cc/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-21 19:45:59,300 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffb3fd34-5edb-433e-bf80-250be794c3cc/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2023-11-21 19:45:59,301 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:45:59,301 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:45:59,301 INFO L85 PathProgramCache]: Analyzing trace with hash -1607315260, now seen corresponding path program 1 times [2023-11-21 19:45:59,301 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:45:59,301 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [33070333] [2023-11-21 19:45:59,301 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:45:59,302 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:45:59,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:45:59,542 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 20 proven. 4 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2023-11-21 19:45:59,543 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:45:59,543 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [33070333] [2023-11-21 19:45:59,543 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [33070333] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:45:59,543 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1617759678] [2023-11-21 19:45:59,543 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:45:59,544 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:45:59,544 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffb3fd34-5edb-433e-bf80-250be794c3cc/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:45:59,545 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffb3fd34-5edb-433e-bf80-250be794c3cc/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:45:59,567 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffb3fd34-5edb-433e-bf80-250be794c3cc/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-21 19:45:59,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:45:59,653 INFO L262 TraceCheckSpWp]: Trace formula consists of 402 conjuncts, 10 conjunts are in the unsatisfiable core [2023-11-21 19:45:59,659 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:45:59,701 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 36 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-11-21 19:45:59,701 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-21 19:45:59,701 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1617759678] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:45:59,701 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-21 19:45:59,702 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [8] total 8 [2023-11-21 19:45:59,702 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1918973318] [2023-11-21 19:45:59,702 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:45:59,703 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-21 19:45:59,703 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:45:59,704 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-21 19:45:59,704 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2023-11-21 19:45:59,704 INFO L87 Difference]: Start difference. First operand 578 states and 659 transitions. Second operand has 6 states, 5 states have (on average 13.8) internal successors, (69), 5 states have internal predecessors, (69), 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) [2023-11-21 19:45:59,917 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:45:59,917 INFO L93 Difference]: Finished difference Result 1337 states and 1533 transitions. [2023-11-21 19:45:59,917 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-21 19:45:59,918 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 13.8) internal successors, (69), 5 states have internal predecessors, (69), 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 112 [2023-11-21 19:45:59,918 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:45:59,923 INFO L225 Difference]: With dead ends: 1337 [2023-11-21 19:45:59,924 INFO L226 Difference]: Without dead ends: 870 [2023-11-21 19:45:59,925 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 115 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2023-11-21 19:45:59,926 INFO L413 NwaCegarLoop]: 110 mSDtfsCounter, 43 mSDsluCounter, 391 mSDsCounter, 0 mSdLazyCounter, 114 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 501 SdHoareTripleChecker+Invalid, 117 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 114 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-21 19:45:59,926 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [44 Valid, 501 Invalid, 117 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 114 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-21 19:45:59,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 870 states. [2023-11-21 19:46:00,047 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 870 to 836. [2023-11-21 19:46:00,050 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 836 states, 587 states have (on average 1.1686541737649063) internal successors, (686), 594 states have internal predecessors, (686), 128 states have call successors, (128), 115 states have call predecessors, (128), 120 states have return successors, (139), 127 states have call predecessors, (139), 127 states have call successors, (139) [2023-11-21 19:46:00,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 836 states to 836 states and 953 transitions. [2023-11-21 19:46:00,054 INFO L78 Accepts]: Start accepts. Automaton has 836 states and 953 transitions. Word has length 112 [2023-11-21 19:46:00,055 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:46:00,055 INFO L495 AbstractCegarLoop]: Abstraction has 836 states and 953 transitions. [2023-11-21 19:46:00,055 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 13.8) internal successors, (69), 5 states have internal predecessors, (69), 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) [2023-11-21 19:46:00,055 INFO L276 IsEmpty]: Start isEmpty. Operand 836 states and 953 transitions. [2023-11-21 19:46:00,057 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2023-11-21 19:46:00,057 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:46:00,057 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] [2023-11-21 19:46:00,085 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffb3fd34-5edb-433e-bf80-250be794c3cc/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-21 19:46:00,278 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffb3fd34-5edb-433e-bf80-250be794c3cc/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:46:00,279 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:46:00,279 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:46:00,279 INFO L85 PathProgramCache]: Analyzing trace with hash 1730723653, now seen corresponding path program 1 times [2023-11-21 19:46:00,279 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:46:00,279 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [489327350] [2023-11-21 19:46:00,279 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:46:00,279 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:46:00,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:46:00,343 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 27 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-11-21 19:46:00,343 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:46:00,343 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [489327350] [2023-11-21 19:46:00,343 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [489327350] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:46:00,344 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:46:00,344 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-21 19:46:00,344 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1849143912] [2023-11-21 19:46:00,344 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:46:00,345 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-21 19:46:00,345 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:46:00,345 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-21 19:46:00,345 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-21 19:46:00,346 INFO L87 Difference]: Start difference. First operand 836 states and 953 transitions. Second operand has 4 states, 4 states have (on average 16.75) internal successors, (67), 4 states have internal predecessors, (67), 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) [2023-11-21 19:46:00,620 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:46:00,620 INFO L93 Difference]: Finished difference Result 1560 states and 1811 transitions. [2023-11-21 19:46:00,624 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-21 19:46:00,625 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 16.75) internal successors, (67), 4 states have internal predecessors, (67), 4 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) Word has length 112 [2023-11-21 19:46:00,625 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:46:00,629 INFO L225 Difference]: With dead ends: 1560 [2023-11-21 19:46:00,630 INFO L226 Difference]: Without dead ends: 835 [2023-11-21 19:46:00,633 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 [2023-11-21 19:46:00,634 INFO L413 NwaCegarLoop]: 111 mSDtfsCounter, 112 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 103 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 112 SdHoareTripleChecker+Valid, 179 SdHoareTripleChecker+Invalid, 106 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 103 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-21 19:46:00,634 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [112 Valid, 179 Invalid, 106 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 103 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-21 19:46:00,636 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 835 states. [2023-11-21 19:46:00,773 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 835 to 828. [2023-11-21 19:46:00,775 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 828 states, 579 states have (on average 1.1381692573402418) internal successors, (659), 586 states have internal predecessors, (659), 128 states have call successors, (128), 115 states have call predecessors, (128), 120 states have return successors, (139), 127 states have call predecessors, (139), 127 states have call successors, (139) [2023-11-21 19:46:00,779 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 828 states to 828 states and 926 transitions. [2023-11-21 19:46:00,779 INFO L78 Accepts]: Start accepts. Automaton has 828 states and 926 transitions. Word has length 112 [2023-11-21 19:46:00,779 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:46:00,780 INFO L495 AbstractCegarLoop]: Abstraction has 828 states and 926 transitions. [2023-11-21 19:46:00,780 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 16.75) internal successors, (67), 4 states have internal predecessors, (67), 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) [2023-11-21 19:46:00,780 INFO L276 IsEmpty]: Start isEmpty. Operand 828 states and 926 transitions. [2023-11-21 19:46:00,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2023-11-21 19:46:00,782 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:46:00,782 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] [2023-11-21 19:46:00,782 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2023-11-21 19:46:00,783 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:46:00,783 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:46:00,783 INFO L85 PathProgramCache]: Analyzing trace with hash 1501600620, now seen corresponding path program 1 times [2023-11-21 19:46:00,783 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:46:00,784 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [943029575] [2023-11-21 19:46:00,784 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:46:00,784 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:46:00,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:46:01,778 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 20 proven. 13 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-11-21 19:46:01,779 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:46:01,779 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [943029575] [2023-11-21 19:46:01,779 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [943029575] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:46:01,779 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [527687329] [2023-11-21 19:46:01,779 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:46:01,779 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:46:01,780 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffb3fd34-5edb-433e-bf80-250be794c3cc/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:46:01,781 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffb3fd34-5edb-433e-bf80-250be794c3cc/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:46:01,796 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffb3fd34-5edb-433e-bf80-250be794c3cc/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-21 19:46:01,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:46:01,895 INFO L262 TraceCheckSpWp]: Trace formula consists of 407 conjuncts, 39 conjunts are in the unsatisfiable core [2023-11-21 19:46:01,899 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:46:02,454 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 41 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-11-21 19:46:02,455 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-21 19:46:02,455 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [527687329] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:46:02,456 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-21 19:46:02,456 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [21] total 29 [2023-11-21 19:46:02,457 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1137224037] [2023-11-21 19:46:02,457 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:46:02,459 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-11-21 19:46:02,459 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:46:02,460 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-11-21 19:46:02,461 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=693, Unknown=0, NotChecked=0, Total=812 [2023-11-21 19:46:02,461 INFO L87 Difference]: Start difference. First operand 828 states and 926 transitions. Second operand has 12 states, 7 states have (on average 10.285714285714286) internal successors, (72), 8 states have internal predecessors, (72), 4 states have call successors, (15), 6 states have call predecessors, (15), 7 states have return successors, (15), 3 states have call predecessors, (15), 4 states have call successors, (15) [2023-11-21 19:46:03,141 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:46:03,141 INFO L93 Difference]: Finished difference Result 1886 states and 2127 transitions. [2023-11-21 19:46:03,141 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-11-21 19:46:03,142 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 7 states have (on average 10.285714285714286) internal successors, (72), 8 states have internal predecessors, (72), 4 states have call successors, (15), 6 states have call predecessors, (15), 7 states have return successors, (15), 3 states have call predecessors, (15), 4 states have call successors, (15) Word has length 113 [2023-11-21 19:46:03,142 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:46:03,148 INFO L225 Difference]: With dead ends: 1886 [2023-11-21 19:46:03,148 INFO L226 Difference]: Without dead ends: 1171 [2023-11-21 19:46:03,151 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 112 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 288 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=213, Invalid=977, Unknown=0, NotChecked=0, Total=1190 [2023-11-21 19:46:03,151 INFO L413 NwaCegarLoop]: 65 mSDtfsCounter, 179 mSDsluCounter, 399 mSDsCounter, 0 mSdLazyCounter, 489 mSolverCounterSat, 104 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 186 SdHoareTripleChecker+Valid, 464 SdHoareTripleChecker+Invalid, 593 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 104 IncrementalHoareTripleChecker+Valid, 489 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-21 19:46:03,152 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [186 Valid, 464 Invalid, 593 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [104 Valid, 489 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-21 19:46:03,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1171 states. [2023-11-21 19:46:03,322 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1171 to 1081. [2023-11-21 19:46:03,325 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1081 states, 758 states have (on average 1.1358839050131926) internal successors, (861), 767 states have internal predecessors, (861), 166 states have call successors, (166), 149 states have call predecessors, (166), 156 states have return successors, (181), 165 states have call predecessors, (181), 165 states have call successors, (181) [2023-11-21 19:46:03,330 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1081 states to 1081 states and 1208 transitions. [2023-11-21 19:46:03,330 INFO L78 Accepts]: Start accepts. Automaton has 1081 states and 1208 transitions. Word has length 113 [2023-11-21 19:46:03,331 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:46:03,331 INFO L495 AbstractCegarLoop]: Abstraction has 1081 states and 1208 transitions. [2023-11-21 19:46:03,331 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 7 states have (on average 10.285714285714286) internal successors, (72), 8 states have internal predecessors, (72), 4 states have call successors, (15), 6 states have call predecessors, (15), 7 states have return successors, (15), 3 states have call predecessors, (15), 4 states have call successors, (15) [2023-11-21 19:46:03,331 INFO L276 IsEmpty]: Start isEmpty. Operand 1081 states and 1208 transitions. [2023-11-21 19:46:03,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2023-11-21 19:46:03,334 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:46:03,334 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] [2023-11-21 19:46:03,356 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffb3fd34-5edb-433e-bf80-250be794c3cc/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-21 19:46:03,555 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffb3fd34-5edb-433e-bf80-250be794c3cc/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2023-11-21 19:46:03,556 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:46:03,556 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:46:03,556 INFO L85 PathProgramCache]: Analyzing trace with hash 966073292, now seen corresponding path program 1 times [2023-11-21 19:46:03,556 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:46:03,556 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [864614338] [2023-11-21 19:46:03,556 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:46:03,557 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:46:03,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:46:03,883 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 23 proven. 10 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-11-21 19:46:03,883 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:46:03,883 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [864614338] [2023-11-21 19:46:03,883 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [864614338] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:46:03,883 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1030707548] [2023-11-21 19:46:03,884 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:46:03,884 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:46:03,884 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffb3fd34-5edb-433e-bf80-250be794c3cc/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:46:03,885 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffb3fd34-5edb-433e-bf80-250be794c3cc/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:46:03,901 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffb3fd34-5edb-433e-bf80-250be794c3cc/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-21 19:46:03,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:46:04,001 INFO L262 TraceCheckSpWp]: Trace formula consists of 406 conjuncts, 22 conjunts are in the unsatisfiable core [2023-11-21 19:46:04,005 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:46:04,098 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 35 proven. 2 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-11-21 19:46:04,098 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:46:04,296 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 25 proven. 0 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2023-11-21 19:46:04,296 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1030707548] provided 1 perfect and 1 imperfect interpolant sequences [2023-11-21 19:46:04,297 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-11-21 19:46:04,297 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [14, 8] total 20 [2023-11-21 19:46:04,298 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [42698059] [2023-11-21 19:46:04,298 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:46:04,299 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-21 19:46:04,299 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:46:04,300 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-21 19:46:04,300 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2023-11-21 19:46:04,301 INFO L87 Difference]: Start difference. First operand 1081 states and 1208 transitions. Second operand has 7 states, 6 states have (on average 11.333333333333334) internal successors, (68), 6 states have internal predecessors, (68), 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) [2023-11-21 19:46:04,950 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:46:04,950 INFO L93 Difference]: Finished difference Result 2327 states and 2652 transitions. [2023-11-21 19:46:04,950 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-11-21 19:46:04,951 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 11.333333333333334) internal successors, (68), 6 states have internal predecessors, (68), 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 114 [2023-11-21 19:46:04,951 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:46:04,960 INFO L225 Difference]: With dead ends: 2327 [2023-11-21 19:46:04,960 INFO L226 Difference]: Without dead ends: 1359 [2023-11-21 19:46:04,963 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 250 GetRequests, 226 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=98, Invalid=552, Unknown=0, NotChecked=0, Total=650 [2023-11-21 19:46:04,964 INFO L413 NwaCegarLoop]: 122 mSDtfsCounter, 110 mSDsluCounter, 291 mSDsCounter, 0 mSdLazyCounter, 331 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 112 SdHoareTripleChecker+Valid, 413 SdHoareTripleChecker+Invalid, 357 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 331 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-21 19:46:04,964 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [112 Valid, 413 Invalid, 357 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 331 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-21 19:46:04,966 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1359 states. [2023-11-21 19:46:05,165 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1359 to 1087. [2023-11-21 19:46:05,168 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1087 states, 739 states have (on average 1.128552097428958) internal successors, (834), 753 states have internal predecessors, (834), 178 states have call successors, (178), 151 states have call predecessors, (178), 169 states have return successors, (218), 183 states have call predecessors, (218), 177 states have call successors, (218) [2023-11-21 19:46:05,171 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1087 states to 1087 states and 1230 transitions. [2023-11-21 19:46:05,172 INFO L78 Accepts]: Start accepts. Automaton has 1087 states and 1230 transitions. Word has length 114 [2023-11-21 19:46:05,172 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:46:05,173 INFO L495 AbstractCegarLoop]: Abstraction has 1087 states and 1230 transitions. [2023-11-21 19:46:05,173 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 11.333333333333334) internal successors, (68), 6 states have internal predecessors, (68), 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) [2023-11-21 19:46:05,173 INFO L276 IsEmpty]: Start isEmpty. Operand 1087 states and 1230 transitions. [2023-11-21 19:46:05,175 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2023-11-21 19:46:05,175 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:46:05,176 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] [2023-11-21 19:46:05,202 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffb3fd34-5edb-433e-bf80-250be794c3cc/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-21 19:46:05,396 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffb3fd34-5edb-433e-bf80-250be794c3cc/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2023-11-21 19:46:05,397 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:46:05,397 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:46:05,397 INFO L85 PathProgramCache]: Analyzing trace with hash -2111532289, now seen corresponding path program 1 times [2023-11-21 19:46:05,397 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:46:05,397 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1232216209] [2023-11-21 19:46:05,398 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:46:05,398 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:46:05,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:46:06,365 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 34 proven. 25 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2023-11-21 19:46:06,365 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:46:06,365 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1232216209] [2023-11-21 19:46:06,366 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1232216209] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:46:06,366 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [696851863] [2023-11-21 19:46:06,366 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:46:06,366 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:46:06,366 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffb3fd34-5edb-433e-bf80-250be794c3cc/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:46:06,369 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffb3fd34-5edb-433e-bf80-250be794c3cc/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:46:06,389 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffb3fd34-5edb-433e-bf80-250be794c3cc/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-21 19:46:06,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:46:06,491 INFO L262 TraceCheckSpWp]: Trace formula consists of 436 conjuncts, 43 conjunts are in the unsatisfiable core [2023-11-21 19:46:06,496 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:46:07,492 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 60 proven. 23 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-21 19:46:07,492 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:46:09,153 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 13 proven. 44 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2023-11-21 19:46:09,153 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [696851863] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:46:09,153 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1665702598] [2023-11-21 19:46:09,164 INFO L159 IcfgInterpreter]: Started Sifa with 68 locations of interest [2023-11-21 19:46:09,164 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:46:09,166 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-21 19:46:09,166 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-21 19:46:09,166 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs