./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/systemc/token_ring.05.cil-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 0e0057cc Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/config/TaipanReach.xml -i ../../sv-benchmarks/c/systemc/token_ring.05.cil-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 16e147b68a860b93a665f8bd36a316225675cf186d50a72fc3242bc6ec552f78 --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-12-02 16:20:35,708 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-12-02 16:20:35,773 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-12-02 16:20:35,777 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-12-02 16:20:35,777 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-12-02 16:20:35,801 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-12-02 16:20:35,801 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-12-02 16:20:35,802 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-12-02 16:20:35,802 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-12-02 16:20:35,803 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-12-02 16:20:35,803 INFO L153 SettingsManager]: * User list type=DISABLED [2023-12-02 16:20:35,804 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-12-02 16:20:35,805 INFO L153 SettingsManager]: * Explicit value domain=true [2023-12-02 16:20:35,805 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-12-02 16:20:35,806 INFO L153 SettingsManager]: * Octagon Domain=false [2023-12-02 16:20:35,806 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-12-02 16:20:35,807 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-12-02 16:20:35,807 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-12-02 16:20:35,808 INFO L153 SettingsManager]: * Interval Domain=false [2023-12-02 16:20:35,808 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-12-02 16:20:35,809 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-12-02 16:20:35,810 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-12-02 16:20:35,810 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-12-02 16:20:35,811 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-12-02 16:20:35,811 INFO L153 SettingsManager]: * sizeof long=4 [2023-12-02 16:20:35,811 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-12-02 16:20:35,812 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-12-02 16:20:35,812 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-12-02 16:20:35,812 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-12-02 16:20:35,813 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-12-02 16:20:35,813 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-12-02 16:20:35,814 INFO L153 SettingsManager]: * sizeof long double=12 [2023-12-02 16:20:35,814 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-12-02 16:20:35,814 INFO L153 SettingsManager]: * Use constant arrays=true [2023-12-02 16:20:35,814 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-12-02 16:20:35,814 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-12-02 16:20:35,815 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-12-02 16:20:35,815 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 16:20:35,815 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-12-02 16:20:35,815 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-12-02 16:20:35,815 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-12-02 16:20:35,816 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-12-02 16:20:35,816 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-12-02 16:20:35,816 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-12-02 16:20:35,817 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-12-02 16:20:35,817 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-12-02 16:20:35,817 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-12-02 16:20:35,817 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_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 16e147b68a860b93a665f8bd36a316225675cf186d50a72fc3242bc6ec552f78 [2023-12-02 16:20:36,010 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-12-02 16:20:36,030 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-12-02 16:20:36,032 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-12-02 16:20:36,034 INFO L270 PluginConnector]: Initializing CDTParser... [2023-12-02 16:20:36,034 INFO L274 PluginConnector]: CDTParser initialized [2023-12-02 16:20:36,036 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/../../sv-benchmarks/c/systemc/token_ring.05.cil-2.c [2023-12-02 16:20:38,810 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-12-02 16:20:39,011 INFO L384 CDTParser]: Found 1 translation units. [2023-12-02 16:20:39,011 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/sv-benchmarks/c/systemc/token_ring.05.cil-2.c [2023-12-02 16:20:39,027 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/data/e82dedc7f/176522f2c5054aa58c5509e285facdb9/FLAG0ab3c6e78 [2023-12-02 16:20:39,041 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/data/e82dedc7f/176522f2c5054aa58c5509e285facdb9 [2023-12-02 16:20:39,044 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-12-02 16:20:39,045 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-12-02 16:20:39,046 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-12-02 16:20:39,047 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-12-02 16:20:39,052 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-12-02 16:20:39,052 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 04:20:39" (1/1) ... [2023-12-02 16:20:39,054 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2b3d8c62 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:20:39, skipping insertion in model container [2023-12-02 16:20:39,054 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 04:20:39" (1/1) ... [2023-12-02 16:20:39,097 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-12-02 16:20:39,237 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_42837bc3-7ccb-4276-a892-aff6f41c7c69/sv-benchmarks/c/systemc/token_ring.05.cil-2.c[671,684] [2023-12-02 16:20:39,315 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 16:20:39,325 INFO L202 MainTranslator]: Completed pre-run [2023-12-02 16:20:39,336 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_42837bc3-7ccb-4276-a892-aff6f41c7c69/sv-benchmarks/c/systemc/token_ring.05.cil-2.c[671,684] [2023-12-02 16:20:39,375 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 16:20:39,393 INFO L206 MainTranslator]: Completed translation [2023-12-02 16:20:39,393 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:20:39 WrapperNode [2023-12-02 16:20:39,394 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-12-02 16:20:39,394 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-12-02 16:20:39,395 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-12-02 16:20:39,395 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-12-02 16:20:39,400 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:20:39" (1/1) ... [2023-12-02 16:20:39,408 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:20:39" (1/1) ... [2023-12-02 16:20:39,435 INFO L138 Inliner]: procedures = 38, calls = 47, calls flagged for inlining = 21, calls inlined = 21, statements flattened = 465 [2023-12-02 16:20:39,435 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-12-02 16:20:39,436 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-12-02 16:20:39,436 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-12-02 16:20:39,436 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-12-02 16:20:39,445 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:20:39" (1/1) ... [2023-12-02 16:20:39,446 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:20:39" (1/1) ... [2023-12-02 16:20:39,450 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:20:39" (1/1) ... [2023-12-02 16:20:39,450 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:20:39" (1/1) ... [2023-12-02 16:20:39,460 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:20:39" (1/1) ... [2023-12-02 16:20:39,471 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:20:39" (1/1) ... [2023-12-02 16:20:39,473 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:20:39" (1/1) ... [2023-12-02 16:20:39,475 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:20:39" (1/1) ... [2023-12-02 16:20:39,478 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-12-02 16:20:39,479 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-12-02 16:20:39,479 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-12-02 16:20:39,479 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-12-02 16:20:39,480 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:20:39" (1/1) ... [2023-12-02 16:20:39,484 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 16:20:39,494 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:20:39,505 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-12-02 16:20:39,509 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-12-02 16:20:39,537 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-12-02 16:20:39,538 INFO L130 BoogieDeclarations]: Found specification of procedure error [2023-12-02 16:20:39,538 INFO L138 BoogieDeclarations]: Found implementation of procedure error [2023-12-02 16:20:39,538 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2023-12-02 16:20:39,538 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2023-12-02 16:20:39,538 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2023-12-02 16:20:39,539 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2023-12-02 16:20:39,539 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2023-12-02 16:20:39,539 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2023-12-02 16:20:39,539 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2023-12-02 16:20:39,539 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2023-12-02 16:20:39,539 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2023-12-02 16:20:39,540 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2023-12-02 16:20:39,540 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-12-02 16:20:39,540 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2023-12-02 16:20:39,540 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2023-12-02 16:20:39,540 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-12-02 16:20:39,540 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-12-02 16:20:39,635 INFO L241 CfgBuilder]: Building ICFG [2023-12-02 16:20:39,637 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-12-02 16:20:40,108 INFO L282 CfgBuilder]: Performing block encoding [2023-12-02 16:20:40,344 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-12-02 16:20:40,344 INFO L309 CfgBuilder]: Removed 8 assume(true) statements. [2023-12-02 16:20:40,346 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 04:20:40 BoogieIcfgContainer [2023-12-02 16:20:40,346 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-12-02 16:20:40,348 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-12-02 16:20:40,348 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-12-02 16:20:40,351 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-12-02 16:20:40,352 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.12 04:20:39" (1/3) ... [2023-12-02 16:20:40,352 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@75b03443 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 04:20:40, skipping insertion in model container [2023-12-02 16:20:40,352 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:20:39" (2/3) ... [2023-12-02 16:20:40,353 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@75b03443 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 04:20:40, skipping insertion in model container [2023-12-02 16:20:40,353 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 04:20:40" (3/3) ... [2023-12-02 16:20:40,354 INFO L112 eAbstractionObserver]: Analyzing ICFG token_ring.05.cil-2.c [2023-12-02 16:20:40,372 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-12-02 16:20:40,372 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-12-02 16:20:40,424 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-12-02 16:20:40,431 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;@140f8866, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-12-02 16:20:40,431 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-12-02 16:20:40,435 INFO L276 IsEmpty]: Start isEmpty. Operand has 123 states, 93 states have (on average 1.5053763440860215) internal successors, (140), 97 states have internal predecessors, (140), 21 states have call successors, (21), 7 states have call predecessors, (21), 7 states have return successors, (21), 20 states have call predecessors, (21), 21 states have call successors, (21) [2023-12-02 16:20:40,445 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2023-12-02 16:20:40,445 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:20:40,446 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:20:40,446 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:20:40,450 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:20:40,450 INFO L85 PathProgramCache]: Analyzing trace with hash -1675120846, now seen corresponding path program 1 times [2023-12-02 16:20:40,457 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:20:40,457 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1778135234] [2023-12-02 16:20:40,458 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:20:40,458 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:20:40,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:20:40,796 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 16:20:40,796 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:20:40,797 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1778135234] [2023-12-02 16:20:40,797 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1778135234] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:20:40,798 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 16:20:40,798 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-12-02 16:20:40,799 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1644392467] [2023-12-02 16:20:40,800 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:20:40,803 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 16:20:40,804 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:20:40,828 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 16:20:40,829 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 16:20:40,831 INFO L87 Difference]: Start difference. First operand has 123 states, 93 states have (on average 1.5053763440860215) internal successors, (140), 97 states have internal predecessors, (140), 21 states have call successors, (21), 7 states have call predecessors, (21), 7 states have return successors, (21), 20 states have call predecessors, (21), 21 states have call successors, (21) Second operand has 4 states, 4 states have (on average 8.75) internal successors, (35), 4 states have internal predecessors, (35), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2023-12-02 16:20:41,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:20:41,145 INFO L93 Difference]: Finished difference Result 345 states and 528 transitions. [2023-12-02 16:20:41,147 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 16:20:41,148 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 8.75) internal successors, (35), 4 states have internal predecessors, (35), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 46 [2023-12-02 16:20:41,148 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:20:41,159 INFO L225 Difference]: With dead ends: 345 [2023-12-02 16:20:41,159 INFO L226 Difference]: Without dead ends: 223 [2023-12-02 16:20:41,164 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 16:20:41,168 INFO L413 NwaCegarLoop]: 263 mSDtfsCounter, 297 mSDsluCounter, 191 mSDsCounter, 0 mSdLazyCounter, 188 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 297 SdHoareTripleChecker+Valid, 454 SdHoareTripleChecker+Invalid, 201 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 188 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 16:20:41,169 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [297 Valid, 454 Invalid, 201 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 188 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 16:20:41,187 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 223 states. [2023-12-02 16:20:41,229 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 223 to 222. [2023-12-02 16:20:41,231 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 222 states, 173 states have (on average 1.4219653179190752) internal successors, (246), 176 states have internal predecessors, (246), 36 states have call successors, (36), 13 states have call predecessors, (36), 12 states have return successors, (34), 33 states have call predecessors, (34), 34 states have call successors, (34) [2023-12-02 16:20:41,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 222 states to 222 states and 316 transitions. [2023-12-02 16:20:41,236 INFO L78 Accepts]: Start accepts. Automaton has 222 states and 316 transitions. Word has length 46 [2023-12-02 16:20:41,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:20:41,237 INFO L495 AbstractCegarLoop]: Abstraction has 222 states and 316 transitions. [2023-12-02 16:20:41,237 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 8.75) internal successors, (35), 4 states have internal predecessors, (35), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2023-12-02 16:20:41,238 INFO L276 IsEmpty]: Start isEmpty. Operand 222 states and 316 transitions. [2023-12-02 16:20:41,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2023-12-02 16:20:41,243 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:20:41,244 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:20:41,244 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-12-02 16:20:41,244 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:20:41,245 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:20:41,245 INFO L85 PathProgramCache]: Analyzing trace with hash 738037094, now seen corresponding path program 1 times [2023-12-02 16:20:41,245 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:20:41,246 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1813842243] [2023-12-02 16:20:41,246 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:20:41,246 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:20:41,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:20:41,434 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-12-02 16:20:41,434 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:20:41,435 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1813842243] [2023-12-02 16:20:41,435 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1813842243] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:20:41,435 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1818200241] [2023-12-02 16:20:41,435 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:20:41,436 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:20:41,436 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:20:41,438 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:20:41,446 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-12-02 16:20:41,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:20:41,608 INFO L262 TraceCheckSpWp]: Trace formula consists of 518 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 16:20:41,616 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:20:41,670 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-12-02 16:20:41,670 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:20:41,670 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1818200241] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:20:41,671 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:20:41,671 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-12-02 16:20:41,672 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1135747156] [2023-12-02 16:20:41,672 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:20:41,673 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:20:41,673 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:20:41,674 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:20:41,674 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 16:20:41,674 INFO L87 Difference]: Start difference. First operand 222 states and 316 transitions. Second operand has 3 states, 3 states have (on average 18.0) internal successors, (54), 2 states have internal predecessors, (54), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-12-02 16:20:41,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:20:41,788 INFO L93 Difference]: Finished difference Result 649 states and 937 transitions. [2023-12-02 16:20:41,788 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:20:41,788 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 2 states have internal predecessors, (54), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 88 [2023-12-02 16:20:41,788 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:20:41,795 INFO L225 Difference]: With dead ends: 649 [2023-12-02 16:20:41,795 INFO L226 Difference]: Without dead ends: 432 [2023-12-02 16:20:41,797 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 16:20:41,798 INFO L413 NwaCegarLoop]: 188 mSDtfsCounter, 149 mSDsluCounter, 133 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 149 SdHoareTripleChecker+Valid, 321 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:20:41,799 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [149 Valid, 321 Invalid, 66 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 64 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:20:41,800 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 432 states. [2023-12-02 16:20:41,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 432 to 426. [2023-12-02 16:20:41,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 426 states, 337 states have (on average 1.4154302670623145) internal successors, (477), 341 states have internal predecessors, (477), 64 states have call successors, (64), 25 states have call predecessors, (64), 24 states have return successors, (62), 60 states have call predecessors, (62), 62 states have call successors, (62) [2023-12-02 16:20:41,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 426 states to 426 states and 603 transitions. [2023-12-02 16:20:41,858 INFO L78 Accepts]: Start accepts. Automaton has 426 states and 603 transitions. Word has length 88 [2023-12-02 16:20:41,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:20:41,858 INFO L495 AbstractCegarLoop]: Abstraction has 426 states and 603 transitions. [2023-12-02 16:20:41,859 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 2 states have internal predecessors, (54), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-12-02 16:20:41,859 INFO L276 IsEmpty]: Start isEmpty. Operand 426 states and 603 transitions. [2023-12-02 16:20:41,863 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2023-12-02 16:20:41,863 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:20:41,863 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:20:41,871 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-12-02 16:20:42,070 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:20:42,075 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:20:42,075 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:20:42,075 INFO L85 PathProgramCache]: Analyzing trace with hash -1512195036, now seen corresponding path program 1 times [2023-12-02 16:20:42,076 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:20:42,076 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1907960154] [2023-12-02 16:20:42,076 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:20:42,076 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:20:42,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:20:42,218 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-12-02 16:20:42,218 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:20:42,219 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1907960154] [2023-12-02 16:20:42,219 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1907960154] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:20:42,219 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1721965622] [2023-12-02 16:20:42,219 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:20:42,219 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:20:42,220 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:20:42,221 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:20:42,230 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-12-02 16:20:42,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:20:42,380 INFO L262 TraceCheckSpWp]: Trace formula consists of 512 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 16:20:42,385 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:20:42,438 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-12-02 16:20:42,439 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:20:42,439 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1721965622] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:20:42,439 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:20:42,439 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-12-02 16:20:42,440 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [100103210] [2023-12-02 16:20:42,440 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:20:42,440 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:20:42,441 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:20:42,441 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:20:42,442 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 16:20:42,442 INFO L87 Difference]: Start difference. First operand 426 states and 603 transitions. Second operand has 3 states, 3 states have (on average 19.0) internal successors, (57), 2 states have internal predecessors, (57), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-12-02 16:20:42,565 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:20:42,565 INFO L93 Difference]: Finished difference Result 1255 states and 1802 transitions. [2023-12-02 16:20:42,566 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:20:42,566 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 19.0) internal successors, (57), 2 states have internal predecessors, (57), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 88 [2023-12-02 16:20:42,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:20:42,573 INFO L225 Difference]: With dead ends: 1255 [2023-12-02 16:20:42,573 INFO L226 Difference]: Without dead ends: 834 [2023-12-02 16:20:42,575 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 16:20:42,577 INFO L413 NwaCegarLoop]: 186 mSDtfsCounter, 146 mSDsluCounter, 133 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 146 SdHoareTripleChecker+Valid, 319 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:20:42,577 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [146 Valid, 319 Invalid, 66 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 64 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:20:42,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 834 states. [2023-12-02 16:20:42,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 834 to 826. [2023-12-02 16:20:42,631 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 826 states, 659 states have (on average 1.4066767830045523) internal successors, (927), 665 states have internal predecessors, (927), 118 states have call successors, (118), 49 states have call predecessors, (118), 48 states have return successors, (116), 112 states have call predecessors, (116), 116 states have call successors, (116) [2023-12-02 16:20:42,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 826 states to 826 states and 1161 transitions. [2023-12-02 16:20:42,639 INFO L78 Accepts]: Start accepts. Automaton has 826 states and 1161 transitions. Word has length 88 [2023-12-02 16:20:42,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:20:42,639 INFO L495 AbstractCegarLoop]: Abstraction has 826 states and 1161 transitions. [2023-12-02 16:20:42,639 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 19.0) internal successors, (57), 2 states have internal predecessors, (57), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-12-02 16:20:42,640 INFO L276 IsEmpty]: Start isEmpty. Operand 826 states and 1161 transitions. [2023-12-02 16:20:42,643 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2023-12-02 16:20:42,643 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:20:42,643 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:20:42,650 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-12-02 16:20:42,844 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:20:42,844 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:20:42,845 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:20:42,845 INFO L85 PathProgramCache]: Analyzing trace with hash -1951123930, now seen corresponding path program 1 times [2023-12-02 16:20:42,845 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:20:42,845 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [761241788] [2023-12-02 16:20:42,845 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:20:42,846 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:20:42,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:20:42,976 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-12-02 16:20:42,976 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:20:42,976 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [761241788] [2023-12-02 16:20:42,976 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [761241788] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:20:42,976 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [954351911] [2023-12-02 16:20:42,977 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:20:42,977 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:20:42,977 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:20:42,978 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:20:42,982 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-12-02 16:20:43,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:20:43,123 INFO L262 TraceCheckSpWp]: Trace formula consists of 506 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 16:20:43,127 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:20:43,168 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-12-02 16:20:43,168 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:20:43,168 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [954351911] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:20:43,168 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:20:43,169 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-12-02 16:20:43,169 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [874971974] [2023-12-02 16:20:43,169 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:20:43,170 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:20:43,170 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:20:43,171 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:20:43,171 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 16:20:43,171 INFO L87 Difference]: Start difference. First operand 826 states and 1161 transitions. Second operand has 3 states, 3 states have (on average 21.0) internal successors, (63), 2 states have internal predecessors, (63), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-12-02 16:20:43,319 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:20:43,319 INFO L93 Difference]: Finished difference Result 2443 states and 3482 transitions. [2023-12-02 16:20:43,320 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:20:43,320 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.0) internal successors, (63), 2 states have internal predecessors, (63), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 88 [2023-12-02 16:20:43,320 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:20:43,332 INFO L225 Difference]: With dead ends: 2443 [2023-12-02 16:20:43,332 INFO L226 Difference]: Without dead ends: 1622 [2023-12-02 16:20:43,336 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 16:20:43,337 INFO L413 NwaCegarLoop]: 142 mSDtfsCounter, 140 mSDsluCounter, 133 mSDsCounter, 0 mSdLazyCounter, 60 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 140 SdHoareTripleChecker+Valid, 275 SdHoareTripleChecker+Invalid, 62 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 60 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:20:43,337 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [140 Valid, 275 Invalid, 62 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 60 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:20:43,340 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1622 states. [2023-12-02 16:20:43,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1622 to 1610. [2023-12-02 16:20:43,422 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1610 states, 1291 states have (on average 1.396591789310612) internal successors, (1803), 1301 states have internal predecessors, (1803), 222 states have call successors, (222), 97 states have call predecessors, (222), 96 states have return successors, (220), 212 states have call predecessors, (220), 220 states have call successors, (220) [2023-12-02 16:20:43,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1610 states to 1610 states and 2245 transitions. [2023-12-02 16:20:43,435 INFO L78 Accepts]: Start accepts. Automaton has 1610 states and 2245 transitions. Word has length 88 [2023-12-02 16:20:43,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:20:43,436 INFO L495 AbstractCegarLoop]: Abstraction has 1610 states and 2245 transitions. [2023-12-02 16:20:43,436 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.0) internal successors, (63), 2 states have internal predecessors, (63), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-12-02 16:20:43,436 INFO L276 IsEmpty]: Start isEmpty. Operand 1610 states and 2245 transitions. [2023-12-02 16:20:43,440 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2023-12-02 16:20:43,440 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:20:43,441 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:20:43,447 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-12-02 16:20:43,641 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:20:43,641 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:20:43,642 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:20:43,642 INFO L85 PathProgramCache]: Analyzing trace with hash 1248254376, now seen corresponding path program 1 times [2023-12-02 16:20:43,642 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:20:43,642 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1975452748] [2023-12-02 16:20:43,642 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:20:43,642 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:20:43,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:20:43,751 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2023-12-02 16:20:43,751 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:20:43,751 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1975452748] [2023-12-02 16:20:43,751 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1975452748] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:20:43,751 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 16:20:43,752 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 16:20:43,752 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1749920685] [2023-12-02 16:20:43,752 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:20:43,753 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:20:43,753 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:20:43,753 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:20:43,754 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 16:20:43,754 INFO L87 Difference]: Start difference. First operand 1610 states and 2245 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) [2023-12-02 16:20:43,919 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:20:43,919 INFO L93 Difference]: Finished difference Result 2886 states and 4072 transitions. [2023-12-02 16:20:43,920 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:20:43,920 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 88 [2023-12-02 16:20:43,921 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:20:43,936 INFO L225 Difference]: With dead ends: 2886 [2023-12-02 16:20:43,936 INFO L226 Difference]: Without dead ends: 2050 [2023-12-02 16:20:43,940 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 16:20:43,941 INFO L413 NwaCegarLoop]: 216 mSDtfsCounter, 69 mSDsluCounter, 148 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 364 SdHoareTripleChecker+Invalid, 72 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:20:43,941 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [69 Valid, 364 Invalid, 72 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 72 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:20:43,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2050 states. [2023-12-02 16:20:44,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2050 to 1902. [2023-12-02 16:20:44,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1902 states, 1567 states have (on average 1.4262922782386727) internal successors, (2235), 1577 states have internal predecessors, (2235), 230 states have call successors, (230), 105 states have call predecessors, (230), 104 states have return successors, (228), 220 states have call predecessors, (228), 228 states have call successors, (228) [2023-12-02 16:20:44,047 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1902 states to 1902 states and 2693 transitions. [2023-12-02 16:20:44,048 INFO L78 Accepts]: Start accepts. Automaton has 1902 states and 2693 transitions. Word has length 88 [2023-12-02 16:20:44,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:20:44,048 INFO L495 AbstractCegarLoop]: Abstraction has 1902 states and 2693 transitions. [2023-12-02 16:20:44,048 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) [2023-12-02 16:20:44,048 INFO L276 IsEmpty]: Start isEmpty. Operand 1902 states and 2693 transitions. [2023-12-02 16:20:44,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2023-12-02 16:20:44,055 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:20:44,055 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:20:44,055 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-12-02 16:20:44,055 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:20:44,056 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:20:44,056 INFO L85 PathProgramCache]: Analyzing trace with hash -709319720, now seen corresponding path program 1 times [2023-12-02 16:20:44,056 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:20:44,056 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [887701712] [2023-12-02 16:20:44,056 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:20:44,056 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:20:44,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:20:44,133 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2023-12-02 16:20:44,133 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:20:44,133 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [887701712] [2023-12-02 16:20:44,133 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [887701712] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:20:44,133 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 16:20:44,133 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 16:20:44,134 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [487346795] [2023-12-02 16:20:44,134 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:20:44,134 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:20:44,134 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:20:44,135 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:20:44,135 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 16:20:44,135 INFO L87 Difference]: Start difference. First operand 1902 states and 2693 transitions. Second operand has 3 states, 3 states have (on average 19.666666666666668) internal successors, (59), 3 states have internal predecessors, (59), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 16:20:44,363 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:20:44,363 INFO L93 Difference]: Finished difference Result 5623 states and 8038 transitions. [2023-12-02 16:20:44,363 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:20:44,363 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 19.666666666666668) internal successors, (59), 3 states have internal predecessors, (59), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 118 [2023-12-02 16:20:44,364 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:20:44,387 INFO L225 Difference]: With dead ends: 5623 [2023-12-02 16:20:44,387 INFO L226 Difference]: Without dead ends: 3726 [2023-12-02 16:20:44,394 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 16:20:44,395 INFO L413 NwaCegarLoop]: 144 mSDtfsCounter, 139 mSDsluCounter, 133 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 139 SdHoareTripleChecker+Valid, 277 SdHoareTripleChecker+Invalid, 60 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:20:44,395 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [139 Valid, 277 Invalid, 60 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 58 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:20:44,400 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3726 states. [2023-12-02 16:20:44,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3726 to 3698. [2023-12-02 16:20:44,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3698 states, 3051 states have (on average 1.4116683054736152) internal successors, (4307), 3069 states have internal predecessors, (4307), 438 states have call successors, (438), 209 states have call predecessors, (438), 208 states have return successors, (436), 420 states have call predecessors, (436), 436 states have call successors, (436) [2023-12-02 16:20:44,571 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3698 states to 3698 states and 5181 transitions. [2023-12-02 16:20:44,571 INFO L78 Accepts]: Start accepts. Automaton has 3698 states and 5181 transitions. Word has length 118 [2023-12-02 16:20:44,572 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:20:44,572 INFO L495 AbstractCegarLoop]: Abstraction has 3698 states and 5181 transitions. [2023-12-02 16:20:44,572 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 19.666666666666668) internal successors, (59), 3 states have internal predecessors, (59), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 16:20:44,572 INFO L276 IsEmpty]: Start isEmpty. Operand 3698 states and 5181 transitions. [2023-12-02 16:20:44,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2023-12-02 16:20:44,583 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:20:44,583 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:20:44,583 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-12-02 16:20:44,584 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:20:44,584 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:20:44,584 INFO L85 PathProgramCache]: Analyzing trace with hash 1446563061, now seen corresponding path program 1 times [2023-12-02 16:20:44,584 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:20:44,584 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1013959731] [2023-12-02 16:20:44,585 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:20:44,585 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:20:44,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:20:44,687 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2023-12-02 16:20:44,687 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:20:44,687 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1013959731] [2023-12-02 16:20:44,688 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1013959731] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:20:44,688 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 16:20:44,688 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 16:20:44,688 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [691540244] [2023-12-02 16:20:44,688 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:20:44,688 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:20:44,688 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:20:44,689 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:20:44,689 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 16:20:44,689 INFO L87 Difference]: Start difference. First operand 3698 states and 5181 transitions. Second operand has 3 states, 3 states have (on average 19.666666666666668) internal successors, (59), 3 states have internal predecessors, (59), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 16:20:45,017 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:20:45,017 INFO L93 Difference]: Finished difference Result 10939 states and 15462 transitions. [2023-12-02 16:20:45,017 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:20:45,018 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 19.666666666666668) internal successors, (59), 3 states have internal predecessors, (59), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 118 [2023-12-02 16:20:45,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:20:45,059 INFO L225 Difference]: With dead ends: 10939 [2023-12-02 16:20:45,060 INFO L226 Difference]: Without dead ends: 7246 [2023-12-02 16:20:45,071 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 16:20:45,072 INFO L413 NwaCegarLoop]: 169 mSDtfsCounter, 142 mSDsluCounter, 133 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 142 SdHoareTripleChecker+Valid, 302 SdHoareTripleChecker+Invalid, 61 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:20:45,072 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [142 Valid, 302 Invalid, 61 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 59 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:20:45,082 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7246 states. [2023-12-02 16:20:45,397 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7246 to 7194. [2023-12-02 16:20:45,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7194 states, 5939 states have (on average 1.3960262670483246) internal successors, (8291), 5973 states have internal predecessors, (8291), 838 states have call successors, (838), 417 states have call predecessors, (838), 416 states have return successors, (836), 804 states have call predecessors, (836), 836 states have call successors, (836) [2023-12-02 16:20:45,430 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7194 states to 7194 states and 9965 transitions. [2023-12-02 16:20:45,431 INFO L78 Accepts]: Start accepts. Automaton has 7194 states and 9965 transitions. Word has length 118 [2023-12-02 16:20:45,431 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:20:45,431 INFO L495 AbstractCegarLoop]: Abstraction has 7194 states and 9965 transitions. [2023-12-02 16:20:45,431 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 19.666666666666668) internal successors, (59), 3 states have internal predecessors, (59), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 16:20:45,431 INFO L276 IsEmpty]: Start isEmpty. Operand 7194 states and 9965 transitions. [2023-12-02 16:20:45,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2023-12-02 16:20:45,454 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:20:45,454 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:20:45,454 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2023-12-02 16:20:45,454 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:20:45,455 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:20:45,455 INFO L85 PathProgramCache]: Analyzing trace with hash -2095274184, now seen corresponding path program 1 times [2023-12-02 16:20:45,455 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:20:45,455 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [20991808] [2023-12-02 16:20:45,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:20:45,455 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:20:45,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:20:45,561 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 25 proven. 1 refuted. 0 times theorem prover too weak. 67 trivial. 0 not checked. [2023-12-02 16:20:45,561 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:20:45,562 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [20991808] [2023-12-02 16:20:45,562 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [20991808] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:20:45,562 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [633680814] [2023-12-02 16:20:45,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:20:45,562 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:20:45,562 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:20:45,564 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:20:45,570 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-12-02 16:20:45,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:20:45,735 INFO L262 TraceCheckSpWp]: Trace formula consists of 670 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 16:20:45,739 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:20:45,768 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 73 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-12-02 16:20:45,769 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:20:45,769 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [633680814] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:20:45,769 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:20:45,769 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2023-12-02 16:20:45,769 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [798126474] [2023-12-02 16:20:45,769 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:20:45,770 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:20:45,770 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:20:45,771 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:20:45,771 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-12-02 16:20:45,771 INFO L87 Difference]: Start difference. First operand 7194 states and 9965 transitions. Second operand has 3 states, 3 states have (on average 30.666666666666668) internal successors, (92), 3 states have internal predecessors, (92), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 16:20:46,042 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:20:46,043 INFO L93 Difference]: Finished difference Result 13250 states and 18611 transitions. [2023-12-02 16:20:46,043 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:20:46,043 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 30.666666666666668) internal successors, (92), 3 states have internal predecessors, (92), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 134 [2023-12-02 16:20:46,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:20:46,092 INFO L225 Difference]: With dead ends: 13250 [2023-12-02 16:20:46,092 INFO L226 Difference]: Without dead ends: 9558 [2023-12-02 16:20:46,102 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 134 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-12-02 16:20:46,103 INFO L413 NwaCegarLoop]: 212 mSDtfsCounter, 84 mSDsluCounter, 147 mSDsCounter, 0 mSdLazyCounter, 71 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 84 SdHoareTripleChecker+Valid, 359 SdHoareTripleChecker+Invalid, 71 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 71 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:20:46,103 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [84 Valid, 359 Invalid, 71 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 71 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:20:46,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9558 states. [2023-12-02 16:20:46,404 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9558 to 8722. [2023-12-02 16:20:46,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8722 states, 7371 states have (on average 1.4221950888617556) internal successors, (10483), 7405 states have internal predecessors, (10483), 886 states have call successors, (886), 465 states have call predecessors, (886), 464 states have return successors, (884), 852 states have call predecessors, (884), 884 states have call successors, (884) [2023-12-02 16:20:46,443 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8722 states to 8722 states and 12253 transitions. [2023-12-02 16:20:46,443 INFO L78 Accepts]: Start accepts. Automaton has 8722 states and 12253 transitions. Word has length 134 [2023-12-02 16:20:46,444 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:20:46,444 INFO L495 AbstractCegarLoop]: Abstraction has 8722 states and 12253 transitions. [2023-12-02 16:20:46,444 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 30.666666666666668) internal successors, (92), 3 states have internal predecessors, (92), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 16:20:46,444 INFO L276 IsEmpty]: Start isEmpty. Operand 8722 states and 12253 transitions. [2023-12-02 16:20:46,474 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2023-12-02 16:20:46,474 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:20:46,474 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:20:46,481 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-12-02 16:20:46,681 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:20:46,681 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:20:46,681 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:20:46,681 INFO L85 PathProgramCache]: Analyzing trace with hash -122032527, now seen corresponding path program 1 times [2023-12-02 16:20:46,681 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:20:46,682 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1103098800] [2023-12-02 16:20:46,682 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:20:46,682 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:20:46,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:20:46,823 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 23 proven. 3 refuted. 0 times theorem prover too weak. 65 trivial. 0 not checked. [2023-12-02 16:20:46,823 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:20:46,823 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1103098800] [2023-12-02 16:20:46,823 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1103098800] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:20:46,823 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1179586275] [2023-12-02 16:20:46,823 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:20:46,824 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:20:46,824 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:20:46,825 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:20:46,827 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-12-02 16:20:46,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:20:46,989 INFO L262 TraceCheckSpWp]: Trace formula consists of 673 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 16:20:46,994 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:20:47,027 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 71 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-12-02 16:20:47,027 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:20:47,028 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1179586275] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:20:47,028 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:20:47,028 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2023-12-02 16:20:47,028 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1366710368] [2023-12-02 16:20:47,028 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:20:47,029 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:20:47,029 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:20:47,029 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:20:47,029 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-12-02 16:20:47,030 INFO L87 Difference]: Start difference. First operand 8722 states and 12253 transitions. Second operand has 3 states, 3 states have (on average 30.666666666666668) internal successors, (92), 3 states have internal predecessors, (92), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 16:20:47,507 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:20:47,507 INFO L93 Difference]: Finished difference Result 16410 states and 23259 transitions. [2023-12-02 16:20:47,507 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:20:47,508 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 30.666666666666668) internal successors, (92), 3 states have internal predecessors, (92), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 134 [2023-12-02 16:20:47,508 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:20:47,555 INFO L225 Difference]: With dead ends: 16410 [2023-12-02 16:20:47,555 INFO L226 Difference]: Without dead ends: 11966 [2023-12-02 16:20:47,567 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 134 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-12-02 16:20:47,568 INFO L413 NwaCegarLoop]: 241 mSDtfsCounter, 96 mSDsluCounter, 149 mSDsCounter, 0 mSdLazyCounter, 74 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 96 SdHoareTripleChecker+Valid, 390 SdHoareTripleChecker+Invalid, 74 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 74 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:20:47,568 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [96 Valid, 390 Invalid, 74 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 74 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:20:47,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11966 states. [2023-12-02 16:20:47,999 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11966 to 10906. [2023-12-02 16:20:48,015 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10906 states, 9411 states have (on average 1.440335777281904) internal successors, (13555), 9445 states have internal predecessors, (13555), 958 states have call successors, (958), 537 states have call predecessors, (958), 536 states have return successors, (956), 924 states have call predecessors, (956), 956 states have call successors, (956) [2023-12-02 16:20:48,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10906 states to 10906 states and 15469 transitions. [2023-12-02 16:20:48,045 INFO L78 Accepts]: Start accepts. Automaton has 10906 states and 15469 transitions. Word has length 134 [2023-12-02 16:20:48,045 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:20:48,045 INFO L495 AbstractCegarLoop]: Abstraction has 10906 states and 15469 transitions. [2023-12-02 16:20:48,046 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 30.666666666666668) internal successors, (92), 3 states have internal predecessors, (92), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 16:20:48,047 INFO L276 IsEmpty]: Start isEmpty. Operand 10906 states and 15469 transitions. [2023-12-02 16:20:48,119 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2023-12-02 16:20:48,119 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:20:48,119 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:20:48,125 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-12-02 16:20:48,320 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:20:48,320 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:20:48,320 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:20:48,320 INFO L85 PathProgramCache]: Analyzing trace with hash 1535670871, now seen corresponding path program 1 times [2023-12-02 16:20:48,321 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:20:48,321 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [805936849] [2023-12-02 16:20:48,321 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:20:48,321 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:20:48,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:20:48,459 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 22 proven. 4 refuted. 0 times theorem prover too weak. 67 trivial. 0 not checked. [2023-12-02 16:20:48,459 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:20:48,460 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [805936849] [2023-12-02 16:20:48,460 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [805936849] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:20:48,460 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2052553722] [2023-12-02 16:20:48,460 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:20:48,460 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:20:48,460 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:20:48,461 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:20:48,464 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-12-02 16:20:48,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:20:48,624 INFO L262 TraceCheckSpWp]: Trace formula consists of 670 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 16:20:48,627 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:20:48,656 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 73 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-12-02 16:20:48,656 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:20:48,656 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2052553722] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:20:48,656 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:20:48,656 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2023-12-02 16:20:48,657 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1393268708] [2023-12-02 16:20:48,657 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:20:48,657 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:20:48,657 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:20:48,658 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:20:48,658 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-12-02 16:20:48,658 INFO L87 Difference]: Start difference. First operand 10906 states and 15469 transitions. Second operand has 3 states, 3 states have (on average 30.666666666666668) internal successors, (92), 3 states have internal predecessors, (92), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 16:20:49,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:20:49,041 INFO L93 Difference]: Finished difference Result 20890 states and 29871 transitions. [2023-12-02 16:20:49,042 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:20:49,042 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 30.666666666666668) internal successors, (92), 3 states have internal predecessors, (92), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 134 [2023-12-02 16:20:49,042 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:20:49,076 INFO L225 Difference]: With dead ends: 20890 [2023-12-02 16:20:49,076 INFO L226 Difference]: Without dead ends: 15282 [2023-12-02 16:20:49,087 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 134 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-12-02 16:20:49,088 INFO L413 NwaCegarLoop]: 246 mSDtfsCounter, 102 mSDsluCounter, 149 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 102 SdHoareTripleChecker+Valid, 395 SdHoareTripleChecker+Invalid, 75 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:20:49,088 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [102 Valid, 395 Invalid, 75 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 75 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:20:49,102 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15282 states. [2023-12-02 16:20:49,570 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15282 to 14110. [2023-12-02 16:20:49,586 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14110 states, 12399 states have (on average 1.4532623598677312) internal successors, (18019), 12433 states have internal predecessors, (18019), 1066 states have call successors, (1066), 645 states have call predecessors, (1066), 644 states have return successors, (1064), 1032 states have call predecessors, (1064), 1064 states have call successors, (1064) [2023-12-02 16:20:49,626 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14110 states to 14110 states and 20149 transitions. [2023-12-02 16:20:49,627 INFO L78 Accepts]: Start accepts. Automaton has 14110 states and 20149 transitions. Word has length 134 [2023-12-02 16:20:49,627 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:20:49,627 INFO L495 AbstractCegarLoop]: Abstraction has 14110 states and 20149 transitions. [2023-12-02 16:20:49,628 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 30.666666666666668) internal successors, (92), 3 states have internal predecessors, (92), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 16:20:49,628 INFO L276 IsEmpty]: Start isEmpty. Operand 14110 states and 20149 transitions. [2023-12-02 16:20:49,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2023-12-02 16:20:49,662 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:20:49,662 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:20:49,668 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-12-02 16:20:49,862 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-12-02 16:20:49,863 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:20:49,863 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:20:49,863 INFO L85 PathProgramCache]: Analyzing trace with hash 898041975, now seen corresponding path program 1 times [2023-12-02 16:20:49,863 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:20:49,864 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1815558578] [2023-12-02 16:20:49,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:20:49,864 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:20:49,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:20:50,518 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 12 proven. 38 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2023-12-02 16:20:50,518 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:20:50,519 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1815558578] [2023-12-02 16:20:50,519 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1815558578] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:20:50,519 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [910743686] [2023-12-02 16:20:50,519 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:20:50,519 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:20:50,519 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:20:50,520 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:20:50,523 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-12-02 16:20:50,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:20:50,713 INFO L262 TraceCheckSpWp]: Trace formula consists of 771 conjuncts, 24 conjunts are in the unsatisfiable core [2023-12-02 16:20:50,718 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:20:50,890 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 64 proven. 14 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2023-12-02 16:20:50,890 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:20:51,250 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 13 proven. 38 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2023-12-02 16:20:51,250 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [910743686] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:20:51,251 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [52710195] [2023-12-02 16:20:51,272 INFO L159 IcfgInterpreter]: Started Sifa with 74 locations of interest [2023-12-02 16:20:51,272 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:20:51,276 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:20:51,281 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:20:51,282 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:20:58,551 INFO L197 IcfgInterpreter]: Interpreting procedure error with input of size 30 for LOIs [2023-12-02 16:20:58,555 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events with input of size 122 for LOIs [2023-12-02 16:20:58,619 INFO L197 IcfgInterpreter]: Interpreting procedure fire_delta_events with input of size 134 for LOIs [2023-12-02 16:20:58,699 INFO L197 IcfgInterpreter]: Interpreting procedure update_channels with input of size 1 for LOIs [2023-12-02 16:20:58,700 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread with input of size 1 for LOIs [2023-12-02 16:20:58,716 INFO L197 IcfgInterpreter]: Interpreting procedure immediate_notify with input of size 92 for LOIs [2023-12-02 16:20:59,023 INFO L197 IcfgInterpreter]: Interpreting procedure activate_threads with input of size 1 for LOIs [2023-12-02 16:20:59,143 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:21:05,633 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '154882#(and (exists ((|v_ULTIMATE.start_eval_~tmp~0#1_BEFORE_CALL_21| Int)) (and (<= 0 |v_ULTIMATE.start_eval_~tmp~0#1_BEFORE_CALL_21|) (<= |v_ULTIMATE.start_eval_~tmp~0#1_BEFORE_CALL_21| 1) (not (= |v_ULTIMATE.start_eval_~tmp~0#1_BEFORE_CALL_21| 0)))) (= ~m_pc~0 1) (exists ((|v_ULTIMATE.start_eval_~tmp_ndt_1~0#1_BEFORE_CALL_11| Int)) (and (not (= |v_ULTIMATE.start_eval_~tmp_ndt_1~0#1_BEFORE_CALL_11| 0)) (<= 0 (+ 2147483648 |v_ULTIMATE.start_eval_~tmp_ndt_1~0#1_BEFORE_CALL_11|)) (<= |v_ULTIMATE.start_eval_~tmp_ndt_1~0#1_BEFORE_CALL_11| 2147483647))) (= ~m_st~0 1) (not (= ~token~0 (+ 5 ~local~0))))' at error location [2023-12-02 16:21:05,633 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:21:05,633 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:21:05,633 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 9 [2023-12-02 16:21:05,633 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1106803254] [2023-12-02 16:21:05,634 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:21:05,634 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-12-02 16:21:05,634 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:21:05,635 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-12-02 16:21:05,636 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=316, Invalid=3844, Unknown=0, NotChecked=0, Total=4160 [2023-12-02 16:21:05,637 INFO L87 Difference]: Start difference. First operand 14110 states and 20149 transitions. Second operand has 9 states, 9 states have (on average 15.88888888888889) internal successors, (143), 9 states have internal predecessors, (143), 5 states have call successors, (29), 6 states have call predecessors, (29), 7 states have return successors, (30), 6 states have call predecessors, (30), 5 states have call successors, (30) [2023-12-02 16:21:06,550 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:21:06,550 INFO L93 Difference]: Finished difference Result 33826 states and 48267 transitions. [2023-12-02 16:21:06,551 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-12-02 16:21:06,551 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 15.88888888888889) internal successors, (143), 9 states have internal predecessors, (143), 5 states have call successors, (29), 6 states have call predecessors, (29), 7 states have return successors, (30), 6 states have call predecessors, (30), 5 states have call successors, (30) Word has length 138 [2023-12-02 16:21:06,551 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:21:06,600 INFO L225 Difference]: With dead ends: 33826 [2023-12-02 16:21:06,601 INFO L226 Difference]: Without dead ends: 19722 [2023-12-02 16:21:06,631 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 435 GetRequests, 364 SyntacticMatches, 2 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1683 ImplicationChecksByTransitivity, 6.6s TimeCoverageRelationStatistics Valid=377, Invalid=4593, Unknown=0, NotChecked=0, Total=4970 [2023-12-02 16:21:06,632 INFO L413 NwaCegarLoop]: 161 mSDtfsCounter, 482 mSDsluCounter, 439 mSDsCounter, 0 mSdLazyCounter, 283 mSolverCounterSat, 117 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 504 SdHoareTripleChecker+Valid, 600 SdHoareTripleChecker+Invalid, 400 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 117 IncrementalHoareTripleChecker+Valid, 283 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 16:21:06,632 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [504 Valid, 600 Invalid, 400 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [117 Valid, 283 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 16:21:06,650 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19722 states. [2023-12-02 16:21:07,360 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19722 to 19110. [2023-12-02 16:21:07,377 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19110 states, 16671 states have (on average 1.4374062743686642) internal successors, (23963), 16721 states have internal predecessors, (23963), 1526 states have call successors, (1526), 913 states have call predecessors, (1526), 912 states have return successors, (1524), 1476 states have call predecessors, (1524), 1524 states have call successors, (1524) [2023-12-02 16:21:07,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19110 states to 19110 states and 27013 transitions. [2023-12-02 16:21:07,427 INFO L78 Accepts]: Start accepts. Automaton has 19110 states and 27013 transitions. Word has length 138 [2023-12-02 16:21:07,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:21:07,428 INFO L495 AbstractCegarLoop]: Abstraction has 19110 states and 27013 transitions. [2023-12-02 16:21:07,428 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 15.88888888888889) internal successors, (143), 9 states have internal predecessors, (143), 5 states have call successors, (29), 6 states have call predecessors, (29), 7 states have return successors, (30), 6 states have call predecessors, (30), 5 states have call successors, (30) [2023-12-02 16:21:07,428 INFO L276 IsEmpty]: Start isEmpty. Operand 19110 states and 27013 transitions. [2023-12-02 16:21:07,455 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2023-12-02 16:21:07,455 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:21:07,455 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:21:07,460 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2023-12-02 16:21:07,655 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2023-12-02 16:21:07,656 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:21:07,656 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:21:07,656 INFO L85 PathProgramCache]: Analyzing trace with hash 853246968, now seen corresponding path program 2 times [2023-12-02 16:21:07,656 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:21:07,656 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [371026681] [2023-12-02 16:21:07,657 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:21:07,657 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:21:07,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:21:07,846 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 10 proven. 39 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2023-12-02 16:21:07,846 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:21:07,846 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [371026681] [2023-12-02 16:21:07,846 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [371026681] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:21:07,846 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1468829464] [2023-12-02 16:21:07,846 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 16:21:07,846 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:21:07,847 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:21:07,847 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:21:07,850 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-12-02 16:21:07,976 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-12-02 16:21:07,976 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 16:21:07,978 INFO L262 TraceCheckSpWp]: Trace formula consists of 430 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 16:21:07,982 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:21:07,999 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 63 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-12-02 16:21:07,999 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:21:07,999 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1468829464] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:21:08,000 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:21:08,000 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-12-02 16:21:08,000 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1209025615] [2023-12-02 16:21:08,000 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:21:08,001 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:21:08,001 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:21:08,001 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:21:08,001 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 16:21:08,001 INFO L87 Difference]: Start difference. First operand 19110 states and 27013 transitions. Second operand has 3 states, 3 states have (on average 28.666666666666668) internal successors, (86), 3 states have internal predecessors, (86), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 16:21:08,596 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:21:08,596 INFO L93 Difference]: Finished difference Result 32958 states and 47159 transitions. [2023-12-02 16:21:08,597 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:21:08,597 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 28.666666666666668) internal successors, (86), 3 states have internal predecessors, (86), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 134 [2023-12-02 16:21:08,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:21:08,659 INFO L225 Difference]: With dead ends: 32958 [2023-12-02 16:21:08,659 INFO L226 Difference]: Without dead ends: 19146 [2023-12-02 16:21:08,686 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 136 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 16:21:08,686 INFO L413 NwaCegarLoop]: 222 mSDtfsCounter, 152 mSDsluCounter, 135 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 152 SdHoareTripleChecker+Valid, 357 SdHoareTripleChecker+Invalid, 75 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:21:08,687 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [152 Valid, 357 Invalid, 75 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 72 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:21:08,705 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19146 states. [2023-12-02 16:21:09,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19146 to 18958. [2023-12-02 16:21:09,376 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18958 states, 16519 states have (on average 1.424480900780919) internal successors, (23531), 16569 states have internal predecessors, (23531), 1526 states have call successors, (1526), 913 states have call predecessors, (1526), 912 states have return successors, (1524), 1476 states have call predecessors, (1524), 1524 states have call successors, (1524) [2023-12-02 16:21:09,410 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18958 states to 18958 states and 26581 transitions. [2023-12-02 16:21:09,411 INFO L78 Accepts]: Start accepts. Automaton has 18958 states and 26581 transitions. Word has length 134 [2023-12-02 16:21:09,411 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:21:09,411 INFO L495 AbstractCegarLoop]: Abstraction has 18958 states and 26581 transitions. [2023-12-02 16:21:09,411 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 28.666666666666668) internal successors, (86), 3 states have internal predecessors, (86), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 16:21:09,411 INFO L276 IsEmpty]: Start isEmpty. Operand 18958 states and 26581 transitions. [2023-12-02 16:21:09,432 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2023-12-02 16:21:09,432 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:21:09,432 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:21:09,436 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2023-12-02 16:21:09,632 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:21:09,633 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:21:09,633 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:21:09,633 INFO L85 PathProgramCache]: Analyzing trace with hash -807702568, now seen corresponding path program 1 times [2023-12-02 16:21:09,633 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:21:09,633 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [14731113] [2023-12-02 16:21:09,633 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:21:09,633 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:21:09,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:21:09,889 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 10 proven. 37 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2023-12-02 16:21:09,889 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:21:09,889 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [14731113] [2023-12-02 16:21:09,889 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [14731113] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:21:09,889 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [9195282] [2023-12-02 16:21:09,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:21:09,890 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:21:09,890 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:21:09,891 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:21:09,894 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-12-02 16:21:10,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:21:10,052 INFO L262 TraceCheckSpWp]: Trace formula consists of 676 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 16:21:10,056 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:21:10,081 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 65 proven. 0 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2023-12-02 16:21:10,081 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:21:10,081 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [9195282] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:21:10,081 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:21:10,082 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-12-02 16:21:10,082 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [188237546] [2023-12-02 16:21:10,082 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:21:10,082 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:21:10,082 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:21:10,083 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:21:10,083 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 16:21:10,083 INFO L87 Difference]: Start difference. First operand 18958 states and 26581 transitions. Second operand has 3 states, 3 states have (on average 30.0) internal successors, (90), 3 states have internal predecessors, (90), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 16:21:10,643 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:21:10,644 INFO L93 Difference]: Finished difference Result 33982 states and 47514 transitions. [2023-12-02 16:21:10,644 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:21:10,644 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 30.0) internal successors, (90), 3 states have internal predecessors, (90), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 134 [2023-12-02 16:21:10,645 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:21:10,704 INFO L225 Difference]: With dead ends: 33982 [2023-12-02 16:21:10,704 INFO L226 Difference]: Without dead ends: 21458 [2023-12-02 16:21:10,725 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 136 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 16:21:10,726 INFO L413 NwaCegarLoop]: 161 mSDtfsCounter, 150 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 150 SdHoareTripleChecker+Valid, 195 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 16:21:10,726 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [150 Valid, 195 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 16:21:10,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21458 states. [2023-12-02 16:21:11,492 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21458 to 21458. [2023-12-02 16:21:11,503 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21458 states, 18739 states have (on average 1.3972463845456) internal successors, (26183), 18789 states have internal predecessors, (26183), 1618 states have call successors, (1618), 1101 states have call predecessors, (1618), 1100 states have return successors, (1616), 1568 states have call predecessors, (1616), 1616 states have call successors, (1616) [2023-12-02 16:21:11,555 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21458 states to 21458 states and 29417 transitions. [2023-12-02 16:21:11,556 INFO L78 Accepts]: Start accepts. Automaton has 21458 states and 29417 transitions. Word has length 134 [2023-12-02 16:21:11,556 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:21:11,556 INFO L495 AbstractCegarLoop]: Abstraction has 21458 states and 29417 transitions. [2023-12-02 16:21:11,557 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 30.0) internal successors, (90), 3 states have internal predecessors, (90), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 16:21:11,557 INFO L276 IsEmpty]: Start isEmpty. Operand 21458 states and 29417 transitions. [2023-12-02 16:21:11,593 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2023-12-02 16:21:11,593 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:21:11,593 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:21:11,598 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2023-12-02 16:21:11,793 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2023-12-02 16:21:11,794 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:21:11,794 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:21:11,794 INFO L85 PathProgramCache]: Analyzing trace with hash 819274591, now seen corresponding path program 1 times [2023-12-02 16:21:11,794 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:21:11,794 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1560788817] [2023-12-02 16:21:11,794 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:21:11,795 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:21:11,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:21:12,111 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 10 proven. 38 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2023-12-02 16:21:12,111 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:21:12,111 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1560788817] [2023-12-02 16:21:12,111 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1560788817] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:21:12,112 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [865260591] [2023-12-02 16:21:12,112 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:21:12,112 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:21:12,112 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:21:12,113 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:21:12,118 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-12-02 16:21:12,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:21:12,291 INFO L262 TraceCheckSpWp]: Trace formula consists of 675 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 16:21:12,295 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:21:12,325 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 68 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-12-02 16:21:12,325 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:21:12,326 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [865260591] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:21:12,326 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:21:12,326 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-12-02 16:21:12,326 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [462656065] [2023-12-02 16:21:12,327 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:21:12,327 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:21:12,327 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:21:12,328 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:21:12,328 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 16:21:12,328 INFO L87 Difference]: Start difference. First operand 21458 states and 29417 transitions. Second operand has 3 states, 3 states have (on average 31.333333333333332) internal successors, (94), 3 states have internal predecessors, (94), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 16:21:13,367 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:21:13,367 INFO L93 Difference]: Finished difference Result 52962 states and 73392 transitions. [2023-12-02 16:21:13,367 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:21:13,368 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 31.333333333333332) internal successors, (94), 3 states have internal predecessors, (94), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 135 [2023-12-02 16:21:13,368 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:21:13,435 INFO L225 Difference]: With dead ends: 52962 [2023-12-02 16:21:13,435 INFO L226 Difference]: Without dead ends: 31510 [2023-12-02 16:21:13,455 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 137 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 16:21:13,456 INFO L413 NwaCegarLoop]: 158 mSDtfsCounter, 80 mSDsluCounter, 126 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 80 SdHoareTripleChecker+Valid, 284 SdHoareTripleChecker+Invalid, 60 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:21:13,456 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [80 Valid, 284 Invalid, 60 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 58 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:21:13,478 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31510 states. [2023-12-02 16:21:14,226 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31510 to 25654. [2023-12-02 16:21:14,244 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25654 states, 22643 states have (on average 1.4119595459965553) internal successors, (31971), 22694 states have internal predecessors, (31971), 1764 states have call successors, (1764), 1247 states have call predecessors, (1764), 1246 states have return successors, (1762), 1713 states have call predecessors, (1762), 1762 states have call successors, (1762) [2023-12-02 16:21:14,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25654 states to 25654 states and 35497 transitions. [2023-12-02 16:21:14,291 INFO L78 Accepts]: Start accepts. Automaton has 25654 states and 35497 transitions. Word has length 135 [2023-12-02 16:21:14,292 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:21:14,292 INFO L495 AbstractCegarLoop]: Abstraction has 25654 states and 35497 transitions. [2023-12-02 16:21:14,292 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 31.333333333333332) internal successors, (94), 3 states have internal predecessors, (94), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 16:21:14,292 INFO L276 IsEmpty]: Start isEmpty. Operand 25654 states and 35497 transitions. [2023-12-02 16:21:14,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2023-12-02 16:21:14,320 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:21:14,320 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:21:14,325 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2023-12-02 16:21:14,520 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2023-12-02 16:21:14,521 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:21:14,521 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:21:14,521 INFO L85 PathProgramCache]: Analyzing trace with hash 856940124, now seen corresponding path program 1 times [2023-12-02 16:21:14,521 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:21:14,521 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1320794854] [2023-12-02 16:21:14,522 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:21:14,522 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:21:14,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:21:14,903 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 12 proven. 38 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2023-12-02 16:21:14,903 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:21:14,904 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1320794854] [2023-12-02 16:21:14,904 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1320794854] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:21:14,904 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [359407122] [2023-12-02 16:21:14,904 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:21:14,904 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:21:14,904 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:21:14,905 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:21:14,910 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-12-02 16:21:15,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:21:15,090 INFO L262 TraceCheckSpWp]: Trace formula consists of 777 conjuncts, 15 conjunts are in the unsatisfiable core [2023-12-02 16:21:15,093 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:21:15,197 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 74 proven. 20 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-12-02 16:21:15,197 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:21:16,884 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 17 proven. 3 refuted. 0 times theorem prover too weak. 80 trivial. 0 not checked. [2023-12-02 16:21:16,884 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [359407122] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:21:16,884 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [786538497] [2023-12-02 16:21:16,887 INFO L159 IcfgInterpreter]: Started Sifa with 76 locations of interest [2023-12-02 16:21:16,887 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:21:16,887 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:21:16,888 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:21:16,888 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:21:22,452 INFO L197 IcfgInterpreter]: Interpreting procedure error with input of size 47 for LOIs [2023-12-02 16:21:22,457 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events with input of size 123 for LOIs [2023-12-02 16:21:22,562 INFO L197 IcfgInterpreter]: Interpreting procedure fire_delta_events with input of size 134 for LOIs [2023-12-02 16:21:22,643 INFO L197 IcfgInterpreter]: Interpreting procedure update_channels with input of size 1 for LOIs [2023-12-02 16:21:22,643 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread with input of size 1 for LOIs [2023-12-02 16:21:22,707 INFO L197 IcfgInterpreter]: Interpreting procedure immediate_notify with input of size 66 for LOIs [2023-12-02 16:21:22,877 INFO L197 IcfgInterpreter]: Interpreting procedure activate_threads with input of size 1 for LOIs [2023-12-02 16:21:23,044 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:21:30,593 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '442066#(and (<= 1 |#StackHeapBarrier|) (= 0 ~t5_pc~0) (= ~t1_pc~0 0) (= ~t1_i~0 1) (= 0 ~t3_pc~0) (= ~m_pc~0 1) (= ~m_i~0 1) (exists ((|v_ULTIMATE.start_eval_~tmp_ndt_1~0#1_BEFORE_CALL_19| Int)) (and (<= |v_ULTIMATE.start_eval_~tmp_ndt_1~0#1_BEFORE_CALL_19| 2147483647) (not (= |v_ULTIMATE.start_eval_~tmp_ndt_1~0#1_BEFORE_CALL_19| 0)) (<= 0 (+ 2147483648 |v_ULTIMATE.start_eval_~tmp_ndt_1~0#1_BEFORE_CALL_19|)))) (= ~t2_i~0 1) (= 0 ~t2_pc~0) (= ~m_st~0 1) (= ~t5_i~0 1) (= 0 ~t4_pc~0) (= ~t3_i~0 1) (= ~t4_i~0 1) (not (= ~token~0 (+ 5 ~local~0))))' at error location [2023-12-02 16:21:30,594 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:21:30,594 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:21:30,594 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 8, 6] total 16 [2023-12-02 16:21:30,594 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [5283160] [2023-12-02 16:21:30,594 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:21:30,595 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2023-12-02 16:21:30,595 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:21:30,595 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2023-12-02 16:21:30,597 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=470, Invalid=5536, Unknown=0, NotChecked=0, Total=6006 [2023-12-02 16:21:30,597 INFO L87 Difference]: Start difference. First operand 25654 states and 35497 transitions. Second operand has 16 states, 14 states have (on average 12.0) internal successors, (168), 14 states have internal predecessors, (168), 8 states have call successors, (34), 5 states have call predecessors, (34), 6 states have return successors, (33), 8 states have call predecessors, (33), 8 states have call successors, (33) [2023-12-02 16:21:37,286 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:21:37,286 INFO L93 Difference]: Finished difference Result 92940 states and 131384 transitions. [2023-12-02 16:21:37,287 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 114 states. [2023-12-02 16:21:37,287 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 14 states have (on average 12.0) internal successors, (168), 14 states have internal predecessors, (168), 8 states have call successors, (34), 5 states have call predecessors, (34), 6 states have return successors, (33), 8 states have call predecessors, (33), 8 states have call successors, (33) Word has length 140 [2023-12-02 16:21:37,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:21:37,413 INFO L225 Difference]: With dead ends: 92940 [2023-12-02 16:21:37,413 INFO L226 Difference]: Without dead ends: 67292 [2023-12-02 16:21:37,455 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 600 GetRequests, 413 SyntacticMatches, 0 SemanticMatches, 187 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13884 ImplicationChecksByTransitivity, 9.8s TimeCoverageRelationStatistics Valid=2487, Invalid=33045, Unknown=0, NotChecked=0, Total=35532 [2023-12-02 16:21:37,455 INFO L413 NwaCegarLoop]: 683 mSDtfsCounter, 1985 mSDsluCounter, 5343 mSDsCounter, 0 mSdLazyCounter, 3227 mSolverCounterSat, 394 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1991 SdHoareTripleChecker+Valid, 6026 SdHoareTripleChecker+Invalid, 3621 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 394 IncrementalHoareTripleChecker+Valid, 3227 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2023-12-02 16:21:37,456 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1991 Valid, 6026 Invalid, 3621 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [394 Valid, 3227 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2023-12-02 16:21:37,503 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67292 states. [2023-12-02 16:21:39,286 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67292 to 45976. [2023-12-02 16:21:39,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45976 states, 41412 states have (on average 1.3917946488940405) internal successors, (57637), 41485 states have internal predecessors, (57637), 2491 states have call successors, (2491), 2073 states have call predecessors, (2491), 2072 states have return successors, (2489), 2418 states have call predecessors, (2489), 2489 states have call successors, (2489) [2023-12-02 16:21:39,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45976 states to 45976 states and 62617 transitions. [2023-12-02 16:21:39,397 INFO L78 Accepts]: Start accepts. Automaton has 45976 states and 62617 transitions. Word has length 140 [2023-12-02 16:21:39,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:21:39,398 INFO L495 AbstractCegarLoop]: Abstraction has 45976 states and 62617 transitions. [2023-12-02 16:21:39,398 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 14 states have (on average 12.0) internal successors, (168), 14 states have internal predecessors, (168), 8 states have call successors, (34), 5 states have call predecessors, (34), 6 states have return successors, (33), 8 states have call predecessors, (33), 8 states have call successors, (33) [2023-12-02 16:21:39,398 INFO L276 IsEmpty]: Start isEmpty. Operand 45976 states and 62617 transitions. [2023-12-02 16:21:39,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2023-12-02 16:21:39,436 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:21:39,436 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:21:39,441 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2023-12-02 16:21:39,637 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:21:39,637 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:21:39,637 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:21:39,637 INFO L85 PathProgramCache]: Analyzing trace with hash 194659875, now seen corresponding path program 1 times [2023-12-02 16:21:39,638 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:21:39,638 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1936507803] [2023-12-02 16:21:39,638 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:21:39,638 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:21:39,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:21:39,715 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 24 proven. 4 refuted. 0 times theorem prover too weak. 65 trivial. 0 not checked. [2023-12-02 16:21:39,716 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:21:39,716 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1936507803] [2023-12-02 16:21:39,716 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1936507803] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:21:39,716 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [699522508] [2023-12-02 16:21:39,716 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:21:39,716 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:21:39,716 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:21:39,717 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:21:39,722 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-12-02 16:21:39,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:21:39,857 INFO L262 TraceCheckSpWp]: Trace formula consists of 685 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 16:21:39,860 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:21:39,879 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 73 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-12-02 16:21:39,879 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:21:39,879 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [699522508] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:21:39,879 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:21:39,880 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2023-12-02 16:21:39,880 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [155466437] [2023-12-02 16:21:39,880 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:21:39,880 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:21:39,880 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:21:39,881 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:21:39,881 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-12-02 16:21:39,881 INFO L87 Difference]: Start difference. First operand 45976 states and 62617 transitions. Second operand has 3 states, 3 states have (on average 32.0) internal successors, (96), 3 states have internal predecessors, (96), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 16:21:41,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:21:41,937 INFO L93 Difference]: Finished difference Result 86993 states and 119321 transitions. [2023-12-02 16:21:41,938 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:21:41,938 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 32.0) internal successors, (96), 3 states have internal predecessors, (96), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 138 [2023-12-02 16:21:41,938 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:21:42,044 INFO L225 Difference]: With dead ends: 86993 [2023-12-02 16:21:42,045 INFO L226 Difference]: Without dead ends: 56004 [2023-12-02 16:21:42,072 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 138 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-12-02 16:21:42,072 INFO L413 NwaCegarLoop]: 220 mSDtfsCounter, 87 mSDsluCounter, 148 mSDsCounter, 0 mSdLazyCounter, 71 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 368 SdHoareTripleChecker+Invalid, 71 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 71 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:21:42,072 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [87 Valid, 368 Invalid, 71 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 71 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:21:42,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56004 states. [2023-12-02 16:21:44,274 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56004 to 54168. [2023-12-02 16:21:44,299 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54168 states, 48901 states have (on average 1.3978241753747367) internal successors, (68355), 48970 states have internal predecessors, (68355), 2840 states have call successors, (2840), 2427 states have call predecessors, (2840), 2426 states have return successors, (2838), 2771 states have call predecessors, (2838), 2838 states have call successors, (2838) [2023-12-02 16:21:44,390 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54168 states to 54168 states and 74033 transitions. [2023-12-02 16:21:44,392 INFO L78 Accepts]: Start accepts. Automaton has 54168 states and 74033 transitions. Word has length 138 [2023-12-02 16:21:44,392 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:21:44,392 INFO L495 AbstractCegarLoop]: Abstraction has 54168 states and 74033 transitions. [2023-12-02 16:21:44,392 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 32.0) internal successors, (96), 3 states have internal predecessors, (96), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 16:21:44,392 INFO L276 IsEmpty]: Start isEmpty. Operand 54168 states and 74033 transitions. [2023-12-02 16:21:44,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2023-12-02 16:21:44,431 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:21:44,431 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:21:44,437 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2023-12-02 16:21:44,632 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2023-12-02 16:21:44,632 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:21:44,632 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:21:44,632 INFO L85 PathProgramCache]: Analyzing trace with hash -110786705, now seen corresponding path program 1 times [2023-12-02 16:21:44,632 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:21:44,632 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2088148920] [2023-12-02 16:21:44,633 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:21:44,633 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:21:44,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:21:44,737 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 21 proven. 7 refuted. 0 times theorem prover too weak. 65 trivial. 0 not checked. [2023-12-02 16:21:44,737 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:21:44,737 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2088148920] [2023-12-02 16:21:44,737 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2088148920] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:21:44,737 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1581736873] [2023-12-02 16:21:44,737 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:21:44,737 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:21:44,738 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:21:44,739 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:21:44,741 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-12-02 16:21:44,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:21:44,897 INFO L262 TraceCheckSpWp]: Trace formula consists of 700 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 16:21:44,899 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:21:44,923 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 73 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-12-02 16:21:44,923 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:21:44,923 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1581736873] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:21:44,924 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:21:44,924 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2023-12-02 16:21:44,924 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [623768991] [2023-12-02 16:21:44,924 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:21:44,925 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:21:44,925 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:21:44,925 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:21:44,926 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-12-02 16:21:44,926 INFO L87 Difference]: Start difference. First operand 54168 states and 74033 transitions. Second operand has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 3 states have internal predecessors, (101), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 16:21:47,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:21:47,449 INFO L93 Difference]: Finished difference Result 101440 states and 138663 transitions. [2023-12-02 16:21:47,450 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:21:47,450 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 3 states have internal predecessors, (101), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 143 [2023-12-02 16:21:47,450 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:21:47,621 INFO L225 Difference]: With dead ends: 101440 [2023-12-02 16:21:47,621 INFO L226 Difference]: Without dead ends: 71536 [2023-12-02 16:21:47,648 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 143 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-12-02 16:21:47,649 INFO L413 NwaCegarLoop]: 238 mSDtfsCounter, 105 mSDsluCounter, 149 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 105 SdHoareTripleChecker+Valid, 387 SdHoareTripleChecker+Invalid, 75 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:21:47,649 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [105 Valid, 387 Invalid, 75 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 75 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:21:47,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71536 states. [2023-12-02 16:21:50,636 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71536 to 67594. [2023-12-02 16:21:50,665 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67594 states, 61023 states have (on average 1.3838552676859546) internal successors, (84447), 61088 states have internal predecessors, (84447), 3484 states have call successors, (3484), 3087 states have call predecessors, (3484), 3086 states have return successors, (3482), 3419 states have call predecessors, (3482), 3482 states have call successors, (3482) [2023-12-02 16:21:50,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67594 states to 67594 states and 91413 transitions. [2023-12-02 16:21:50,775 INFO L78 Accepts]: Start accepts. Automaton has 67594 states and 91413 transitions. Word has length 143 [2023-12-02 16:21:50,776 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:21:50,776 INFO L495 AbstractCegarLoop]: Abstraction has 67594 states and 91413 transitions. [2023-12-02 16:21:50,776 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 3 states have internal predecessors, (101), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 16:21:50,776 INFO L276 IsEmpty]: Start isEmpty. Operand 67594 states and 91413 transitions. [2023-12-02 16:21:50,816 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2023-12-02 16:21:50,817 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:21:50,817 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:21:50,821 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2023-12-02 16:21:51,017 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2023-12-02 16:21:51,017 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:21:51,018 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:21:51,018 INFO L85 PathProgramCache]: Analyzing trace with hash 1361966554, now seen corresponding path program 1 times [2023-12-02 16:21:51,018 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:21:51,018 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1437151608] [2023-12-02 16:21:51,018 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:21:51,018 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:21:51,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:21:51,199 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 18 proven. 36 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2023-12-02 16:21:51,199 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:21:51,199 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1437151608] [2023-12-02 16:21:51,199 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1437151608] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:21:51,199 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [509929666] [2023-12-02 16:21:51,199 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:21:51,199 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:21:51,199 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:21:51,201 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:21:51,210 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2023-12-02 16:21:51,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:21:51,368 INFO L262 TraceCheckSpWp]: Trace formula consists of 712 conjuncts, 5 conjunts are in the unsatisfiable core [2023-12-02 16:21:51,370 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:21:51,403 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 82 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2023-12-02 16:21:51,404 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:21:51,404 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [509929666] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:21:51,404 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:21:51,404 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 8 [2023-12-02 16:21:51,405 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [278638736] [2023-12-02 16:21:51,405 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:21:51,405 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 16:21:51,405 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:21:51,406 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 16:21:51,406 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2023-12-02 16:21:51,406 INFO L87 Difference]: Start difference. First operand 67594 states and 91413 transitions. Second operand has 4 states, 4 states have (on average 28.25) internal successors, (113), 4 states have internal predecessors, (113), 2 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) [2023-12-02 16:21:53,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:21:53,831 INFO L93 Difference]: Finished difference Result 97919 states and 132606 transitions. [2023-12-02 16:21:53,832 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-12-02 16:21:53,832 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 28.25) internal successors, (113), 4 states have internal predecessors, (113), 2 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) Word has length 145 [2023-12-02 16:21:53,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:21:53,939 INFO L225 Difference]: With dead ends: 97919 [2023-12-02 16:21:53,940 INFO L226 Difference]: Without dead ends: 68649 [2023-12-02 16:21:53,961 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 146 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2023-12-02 16:21:53,962 INFO L413 NwaCegarLoop]: 203 mSDtfsCounter, 108 mSDsluCounter, 338 mSDsCounter, 0 mSdLazyCounter, 108 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 108 SdHoareTripleChecker+Valid, 541 SdHoareTripleChecker+Invalid, 111 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 108 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:21:53,962 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [108 Valid, 541 Invalid, 111 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 108 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:21:54,004 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68649 states. [2023-12-02 16:21:56,438 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68649 to 68466. [2023-12-02 16:21:56,479 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68466 states, 61799 states have (on average 1.3824010097250765) internal successors, (85431), 61912 states have internal predecessors, (85431), 3484 states have call successors, (3484), 3087 states have call predecessors, (3484), 3182 states have return successors, (3578), 3467 states have call predecessors, (3578), 3482 states have call successors, (3578) [2023-12-02 16:21:56,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68466 states to 68466 states and 92493 transitions. [2023-12-02 16:21:56,595 INFO L78 Accepts]: Start accepts. Automaton has 68466 states and 92493 transitions. Word has length 145 [2023-12-02 16:21:56,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:21:56,596 INFO L495 AbstractCegarLoop]: Abstraction has 68466 states and 92493 transitions. [2023-12-02 16:21:56,596 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 28.25) internal successors, (113), 4 states have internal predecessors, (113), 2 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) [2023-12-02 16:21:56,596 INFO L276 IsEmpty]: Start isEmpty. Operand 68466 states and 92493 transitions. [2023-12-02 16:21:56,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2023-12-02 16:21:56,638 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:21:56,638 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:21:56,642 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2023-12-02 16:21:56,838 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2023-12-02 16:21:56,838 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:21:56,839 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:21:56,839 INFO L85 PathProgramCache]: Analyzing trace with hash 609297323, now seen corresponding path program 1 times [2023-12-02 16:21:56,839 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:21:56,839 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1782903393] [2023-12-02 16:21:56,839 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:21:56,839 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:21:56,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:21:57,185 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 18 proven. 37 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2023-12-02 16:21:57,186 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:21:57,186 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1782903393] [2023-12-02 16:21:57,186 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1782903393] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:21:57,186 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1096438520] [2023-12-02 16:21:57,186 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:21:57,186 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:21:57,187 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:21:57,188 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:21:57,191 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2023-12-02 16:21:57,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:21:57,333 INFO L262 TraceCheckSpWp]: Trace formula consists of 711 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 16:21:57,337 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:21:57,354 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 72 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-12-02 16:21:57,354 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:21:57,354 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1096438520] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:21:57,354 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:21:57,354 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-12-02 16:21:57,355 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [287292623] [2023-12-02 16:21:57,355 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:21:57,355 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:21:57,355 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:21:57,356 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:21:57,356 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 16:21:57,356 INFO L87 Difference]: Start difference. First operand 68466 states and 92493 transitions. Second operand has 3 states, 3 states have (on average 34.333333333333336) internal successors, (103), 3 states have internal predecessors, (103), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 16:22:00,036 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:22:00,036 INFO L93 Difference]: Finished difference Result 98052 states and 132914 transitions. [2023-12-02 16:22:00,036 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:22:00,037 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 34.333333333333336) internal successors, (103), 3 states have internal predecessors, (103), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 146 [2023-12-02 16:22:00,037 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:22:00,149 INFO L225 Difference]: With dead ends: 98052 [2023-12-02 16:22:00,149 INFO L226 Difference]: Without dead ends: 67426 [2023-12-02 16:22:00,176 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 148 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 16:22:00,176 INFO L413 NwaCegarLoop]: 160 mSDtfsCounter, 34 mSDsluCounter, 140 mSDsCounter, 0 mSdLazyCounter, 62 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 300 SdHoareTripleChecker+Invalid, 62 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 62 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:22:00,177 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 300 Invalid, 62 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 62 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:22:00,219 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67426 states. [2023-12-02 16:22:02,826 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67426 to 65930. [2023-12-02 16:22:02,855 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65930 states, 59551 states have (on average 1.3862235730718209) internal successors, (82551), 59592 states have internal predecessors, (82551), 3388 states have call successors, (3388), 2991 states have call predecessors, (3388), 2990 states have return successors, (3386), 3347 states have call predecessors, (3386), 3386 states have call successors, (3386) [2023-12-02 16:22:02,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65930 states to 65930 states and 89325 transitions. [2023-12-02 16:22:02,966 INFO L78 Accepts]: Start accepts. Automaton has 65930 states and 89325 transitions. Word has length 146 [2023-12-02 16:22:02,966 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:22:02,966 INFO L495 AbstractCegarLoop]: Abstraction has 65930 states and 89325 transitions. [2023-12-02 16:22:02,966 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 34.333333333333336) internal successors, (103), 3 states have internal predecessors, (103), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 16:22:02,966 INFO L276 IsEmpty]: Start isEmpty. Operand 65930 states and 89325 transitions. [2023-12-02 16:22:03,004 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2023-12-02 16:22:03,004 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:22:03,005 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:22:03,009 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2023-12-02 16:22:03,205 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:22:03,205 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:22:03,205 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:22:03,206 INFO L85 PathProgramCache]: Analyzing trace with hash 1234319028, now seen corresponding path program 1 times [2023-12-02 16:22:03,206 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:22:03,206 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [896721376] [2023-12-02 16:22:03,206 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:22:03,206 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:22:03,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:22:03,371 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 20 proven. 37 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2023-12-02 16:22:03,371 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:22:03,371 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [896721376] [2023-12-02 16:22:03,371 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [896721376] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:22:03,371 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [923643573] [2023-12-02 16:22:03,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:22:03,372 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:22:03,372 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:22:03,373 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:22:03,374 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2023-12-02 16:22:03,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:22:03,497 INFO L262 TraceCheckSpWp]: Trace formula consists of 715 conjuncts, 9 conjunts are in the unsatisfiable core [2023-12-02 16:22:03,499 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:22:03,586 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 62 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-12-02 16:22:03,587 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:22:03,587 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [923643573] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:22:03,587 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:22:03,587 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 10 [2023-12-02 16:22:03,587 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1273502251] [2023-12-02 16:22:03,587 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:22:03,588 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 16:22:03,588 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:22:03,588 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 16:22:03,589 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2023-12-02 16:22:03,589 INFO L87 Difference]: Start difference. First operand 65930 states and 89325 transitions. Second operand has 6 states, 6 states have (on average 16.166666666666668) internal successors, (97), 5 states have internal predecessors, (97), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 16:22:08,030 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:22:08,030 INFO L93 Difference]: Finished difference Result 152486 states and 206643 transitions. [2023-12-02 16:22:08,031 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-12-02 16:22:08,031 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 16.166666666666668) internal successors, (97), 5 states have internal predecessors, (97), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 147 [2023-12-02 16:22:08,031 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:22:08,183 INFO L225 Difference]: With dead ends: 152486 [2023-12-02 16:22:08,183 INFO L226 Difference]: Without dead ends: 86612 [2023-12-02 16:22:08,217 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 146 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2023-12-02 16:22:08,218 INFO L413 NwaCegarLoop]: 139 mSDtfsCounter, 422 mSDsluCounter, 252 mSDsCounter, 0 mSdLazyCounter, 165 mSolverCounterSat, 122 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 436 SdHoareTripleChecker+Valid, 391 SdHoareTripleChecker+Invalid, 287 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 122 IncrementalHoareTripleChecker+Valid, 165 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 16:22:08,218 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [436 Valid, 391 Invalid, 287 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [122 Valid, 165 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 16:22:08,320 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86612 states. [2023-12-02 16:22:12,192 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86612 to 86608. [2023-12-02 16:22:12,226 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86608 states, 77935 states have (on average 1.3692051068197857) internal successors, (106709), 77988 states have internal predecessors, (106709), 4614 states have call successors, (4614), 4059 states have call predecessors, (4614), 4058 states have return successors, (4612), 4561 states have call predecessors, (4612), 4612 states have call successors, (4612) [2023-12-02 16:22:12,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86608 states to 86608 states and 115935 transitions. [2023-12-02 16:22:12,373 INFO L78 Accepts]: Start accepts. Automaton has 86608 states and 115935 transitions. Word has length 147 [2023-12-02 16:22:12,373 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:22:12,373 INFO L495 AbstractCegarLoop]: Abstraction has 86608 states and 115935 transitions. [2023-12-02 16:22:12,373 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 16.166666666666668) internal successors, (97), 5 states have internal predecessors, (97), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 16:22:12,373 INFO L276 IsEmpty]: Start isEmpty. Operand 86608 states and 115935 transitions. [2023-12-02 16:22:12,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2023-12-02 16:22:12,419 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:22:12,419 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:22:12,424 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2023-12-02 16:22:12,620 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable19 [2023-12-02 16:22:12,620 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:22:12,620 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:22:12,621 INFO L85 PathProgramCache]: Analyzing trace with hash 862554694, now seen corresponding path program 1 times [2023-12-02 16:22:12,621 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:22:12,621 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1267665541] [2023-12-02 16:22:12,621 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:22:12,621 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:22:12,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:22:12,828 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 20 proven. 39 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2023-12-02 16:22:12,828 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:22:12,828 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1267665541] [2023-12-02 16:22:12,828 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1267665541] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:22:12,828 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1960756061] [2023-12-02 16:22:12,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:22:12,828 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:22:12,829 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:22:12,829 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:22:12,830 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2023-12-02 16:22:12,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:22:12,963 INFO L262 TraceCheckSpWp]: Trace formula consists of 709 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 16:22:12,967 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:22:12,994 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 92 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-12-02 16:22:12,994 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:22:12,994 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1960756061] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:22:12,995 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:22:12,995 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-12-02 16:22:12,995 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1181772583] [2023-12-02 16:22:12,995 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:22:12,995 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:22:12,995 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:22:12,995 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:22:12,996 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 16:22:12,996 INFO L87 Difference]: Start difference. First operand 86608 states and 115935 transitions. Second operand has 3 states, 3 states have (on average 39.333333333333336) internal successors, (118), 3 states have internal predecessors, (118), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 16:22:17,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:22:17,210 INFO L93 Difference]: Finished difference Result 149394 states and 201473 transitions. [2023-12-02 16:22:17,211 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:22:17,211 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 39.333333333333336) internal successors, (118), 3 states have internal predecessors, (118), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 147 [2023-12-02 16:22:17,211 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:22:17,376 INFO L225 Difference]: With dead ends: 149394 [2023-12-02 16:22:17,377 INFO L226 Difference]: Without dead ends: 86660 [2023-12-02 16:22:17,432 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 149 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 16:22:17,433 INFO L413 NwaCegarLoop]: 255 mSDtfsCounter, 131 mSDsluCounter, 134 mSDsCounter, 0 mSdLazyCounter, 78 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 131 SdHoareTripleChecker+Valid, 389 SdHoareTripleChecker+Invalid, 80 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 78 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:22:17,433 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [131 Valid, 389 Invalid, 80 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 78 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:22:17,495 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86660 states. [2023-12-02 16:22:21,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86660 to 85336. [2023-12-02 16:22:21,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85336 states, 76663 states have (on average 1.3538864902234455) internal successors, (103793), 76716 states have internal predecessors, (103793), 4614 states have call successors, (4614), 4059 states have call predecessors, (4614), 4058 states have return successors, (4612), 4561 states have call predecessors, (4612), 4612 states have call successors, (4612) [2023-12-02 16:22:21,530 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85336 states to 85336 states and 113019 transitions. [2023-12-02 16:22:21,533 INFO L78 Accepts]: Start accepts. Automaton has 85336 states and 113019 transitions. Word has length 147 [2023-12-02 16:22:21,533 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:22:21,533 INFO L495 AbstractCegarLoop]: Abstraction has 85336 states and 113019 transitions. [2023-12-02 16:22:21,533 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 39.333333333333336) internal successors, (118), 3 states have internal predecessors, (118), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 16:22:21,533 INFO L276 IsEmpty]: Start isEmpty. Operand 85336 states and 113019 transitions. [2023-12-02 16:22:21,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2023-12-02 16:22:21,579 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:22:21,579 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:22:21,585 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2023-12-02 16:22:21,779 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2023-12-02 16:22:21,780 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:22:21,780 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:22:21,780 INFO L85 PathProgramCache]: Analyzing trace with hash -1913724058, now seen corresponding path program 1 times [2023-12-02 16:22:21,780 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:22:21,780 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1930495037] [2023-12-02 16:22:21,780 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:22:21,780 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:22:21,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:22:21,926 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 20 proven. 37 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2023-12-02 16:22:21,926 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:22:21,926 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1930495037] [2023-12-02 16:22:21,927 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1930495037] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:22:21,927 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [959958438] [2023-12-02 16:22:21,927 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:22:21,927 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:22:21,927 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:22:21,928 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:22:21,929 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2023-12-02 16:22:22,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:22:22,040 INFO L262 TraceCheckSpWp]: Trace formula consists of 715 conjuncts, 9 conjunts are in the unsatisfiable core [2023-12-02 16:22:22,042 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:22:22,106 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 67 proven. 0 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2023-12-02 16:22:22,106 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:22:22,106 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [959958438] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:22:22,106 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:22:22,107 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 10 [2023-12-02 16:22:22,107 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1143117593] [2023-12-02 16:22:22,107 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:22:22,107 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 16:22:22,107 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:22:22,108 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 16:22:22,108 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2023-12-02 16:22:22,108 INFO L87 Difference]: Start difference. First operand 85336 states and 113019 transitions. Second operand has 6 states, 5 states have (on average 20.2) internal successors, (101), 5 states have internal predecessors, (101), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 16:22:27,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:22:27,755 INFO L93 Difference]: Finished difference Result 197236 states and 260955 transitions. [2023-12-02 16:22:27,756 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-12-02 16:22:27,756 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 20.2) internal successors, (101), 5 states have internal predecessors, (101), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 147 [2023-12-02 16:22:27,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:22:27,966 INFO L225 Difference]: With dead ends: 197236 [2023-12-02 16:22:27,966 INFO L226 Difference]: Without dead ends: 111956 [2023-12-02 16:22:28,024 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 146 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2023-12-02 16:22:28,025 INFO L413 NwaCegarLoop]: 137 mSDtfsCounter, 491 mSDsluCounter, 178 mSDsCounter, 0 mSdLazyCounter, 131 mSolverCounterSat, 154 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 505 SdHoareTripleChecker+Valid, 315 SdHoareTripleChecker+Invalid, 285 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 154 IncrementalHoareTripleChecker+Valid, 131 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 16:22:28,025 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [505 Valid, 315 Invalid, 285 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [154 Valid, 131 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 16:22:28,096 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111956 states. [2023-12-02 16:22:33,722 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111956 to 111952. [2023-12-02 16:22:33,774 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111952 states, 100142 states have (on average 1.3321982784446087) internal successors, (133409), 100213 states have internal predecessors, (133409), 6293 states have call successors, (6293), 5517 states have call predecessors, (6293), 5516 states have return successors, (6291), 6222 states have call predecessors, (6291), 6291 states have call successors, (6291) [2023-12-02 16:22:33,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111952 states to 111952 states and 145993 transitions. [2023-12-02 16:22:33,969 INFO L78 Accepts]: Start accepts. Automaton has 111952 states and 145993 transitions. Word has length 147 [2023-12-02 16:22:33,969 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:22:33,970 INFO L495 AbstractCegarLoop]: Abstraction has 111952 states and 145993 transitions. [2023-12-02 16:22:33,970 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 20.2) internal successors, (101), 5 states have internal predecessors, (101), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 16:22:33,970 INFO L276 IsEmpty]: Start isEmpty. Operand 111952 states and 145993 transitions. [2023-12-02 16:22:34,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 152 [2023-12-02 16:22:34,022 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:22:34,023 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:22:34,027 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2023-12-02 16:22:34,223 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2023-12-02 16:22:34,223 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:22:34,224 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:22:34,224 INFO L85 PathProgramCache]: Analyzing trace with hash -1951597378, now seen corresponding path program 1 times [2023-12-02 16:22:34,224 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:22:34,224 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2082937283] [2023-12-02 16:22:34,224 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:22:34,224 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:22:34,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:22:34,369 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 20 proven. 37 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2023-12-02 16:22:34,370 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:22:34,370 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2082937283] [2023-12-02 16:22:34,370 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2082937283] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:22:34,370 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [93495669] [2023-12-02 16:22:34,370 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:22:34,370 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:22:34,370 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:22:34,371 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:22:34,372 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2023-12-02 16:22:34,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:22:34,516 INFO L262 TraceCheckSpWp]: Trace formula consists of 727 conjuncts, 9 conjunts are in the unsatisfiable core [2023-12-02 16:22:34,520 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:22:34,583 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 61 proven. 0 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2023-12-02 16:22:34,583 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:22:34,583 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [93495669] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:22:34,583 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:22:34,583 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 7 [2023-12-02 16:22:34,583 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [985741234] [2023-12-02 16:22:34,583 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:22:34,584 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 16:22:34,584 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:22:34,584 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 16:22:34,585 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2023-12-02 16:22:34,585 INFO L87 Difference]: Start difference. First operand 111952 states and 145993 transitions. Second operand has 6 states, 6 states have (on average 16.333333333333332) internal successors, (98), 5 states have internal predecessors, (98), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 16:22:42,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:22:42,200 INFO L93 Difference]: Finished difference Result 258786 states and 337068 transitions. [2023-12-02 16:22:42,201 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-12-02 16:22:42,201 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 16.333333333333332) internal successors, (98), 5 states have internal predecessors, (98), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 151 [2023-12-02 16:22:42,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:22:42,587 INFO L225 Difference]: With dead ends: 258786 [2023-12-02 16:22:42,587 INFO L226 Difference]: Without dead ends: 146890 [2023-12-02 16:22:42,657 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 153 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2023-12-02 16:22:42,657 INFO L413 NwaCegarLoop]: 131 mSDtfsCounter, 511 mSDsluCounter, 188 mSDsCounter, 0 mSdLazyCounter, 133 mSolverCounterSat, 154 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 525 SdHoareTripleChecker+Valid, 319 SdHoareTripleChecker+Invalid, 287 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 154 IncrementalHoareTripleChecker+Valid, 133 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 16:22:42,657 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [525 Valid, 319 Invalid, 287 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [154 Valid, 133 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 16:22:42,737 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146890 states. [2023-12-02 16:22:50,597 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146890 to 146886. [2023-12-02 16:22:50,656 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 146886 states, 130792 states have (on average 1.310982323077864) internal successors, (171466), 130890 states have internal predecessors, (171466), 8590 states have call successors, (8590), 7504 states have call predecessors, (8590), 7503 states have return successors, (8588), 8492 states have call predecessors, (8588), 8588 states have call successors, (8588) [2023-12-02 16:22:50,911 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146886 states to 146886 states and 188644 transitions. [2023-12-02 16:22:50,915 INFO L78 Accepts]: Start accepts. Automaton has 146886 states and 188644 transitions. Word has length 151 [2023-12-02 16:22:50,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:22:50,916 INFO L495 AbstractCegarLoop]: Abstraction has 146886 states and 188644 transitions. [2023-12-02 16:22:50,916 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 16.333333333333332) internal successors, (98), 5 states have internal predecessors, (98), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 16:22:50,916 INFO L276 IsEmpty]: Start isEmpty. Operand 146886 states and 188644 transitions. [2023-12-02 16:22:50,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2023-12-02 16:22:50,993 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:22:50,993 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:22:50,998 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2023-12-02 16:22:51,193 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:22:51,193 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:22:51,194 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:22:51,194 INFO L85 PathProgramCache]: Analyzing trace with hash -803068876, now seen corresponding path program 1 times [2023-12-02 16:22:51,194 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:22:51,194 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [913430904] [2023-12-02 16:22:51,194 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:22:51,194 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:22:51,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:22:51,319 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 44 proven. 20 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2023-12-02 16:22:51,319 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:22:51,319 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [913430904] [2023-12-02 16:22:51,319 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [913430904] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:22:51,320 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [612991635] [2023-12-02 16:22:51,320 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:22:51,320 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:22:51,320 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:22:51,320 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:22:51,321 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2023-12-02 16:22:51,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:22:51,437 INFO L262 TraceCheckSpWp]: Trace formula consists of 739 conjuncts, 6 conjunts are in the unsatisfiable core [2023-12-02 16:22:51,440 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:22:51,490 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 90 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-12-02 16:22:51,490 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:22:51,490 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [612991635] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:22:51,490 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:22:51,490 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 6 [2023-12-02 16:22:51,490 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1750750481] [2023-12-02 16:22:51,490 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:22:51,491 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:22:51,491 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:22:51,491 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:22:51,491 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 16:22:51,491 INFO L87 Difference]: Start difference. First operand 146886 states and 188644 transitions. Second operand has 3 states, 3 states have (on average 41.666666666666664) internal successors, (125), 3 states have internal predecessors, (125), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 16:22:59,312 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:22:59,312 INFO L93 Difference]: Finished difference Result 259694 states and 334782 transitions. [2023-12-02 16:22:59,313 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:22:59,313 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 41.666666666666664) internal successors, (125), 3 states have internal predecessors, (125), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 155 [2023-12-02 16:22:59,313 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:22:59,605 INFO L225 Difference]: With dead ends: 259694 [2023-12-02 16:22:59,605 INFO L226 Difference]: Without dead ends: 154048 [2023-12-02 16:22:59,680 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 157 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 16:22:59,681 INFO L413 NwaCegarLoop]: 165 mSDtfsCounter, 108 mSDsluCounter, 41 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 108 SdHoareTripleChecker+Valid, 206 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 16:22:59,681 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [108 Valid, 206 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 16:22:59,783 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154048 states. [2023-12-02 16:23:08,382 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154048 to 153606. [2023-12-02 16:23:08,450 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 153606 states, 136956 states have (on average 1.3037690937235316) internal successors, (178559), 137054 states have internal predecessors, (178559), 8739 states have call successors, (8739), 7911 states have call predecessors, (8739), 7910 states have return successors, (9057), 8641 states have call predecessors, (9057), 8737 states have call successors, (9057) [2023-12-02 16:23:08,874 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153606 states to 153606 states and 196355 transitions. [2023-12-02 16:23:08,878 INFO L78 Accepts]: Start accepts. Automaton has 153606 states and 196355 transitions. Word has length 155 [2023-12-02 16:23:08,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:23:08,879 INFO L495 AbstractCegarLoop]: Abstraction has 153606 states and 196355 transitions. [2023-12-02 16:23:08,879 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 41.666666666666664) internal successors, (125), 3 states have internal predecessors, (125), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 16:23:08,879 INFO L276 IsEmpty]: Start isEmpty. Operand 153606 states and 196355 transitions. [2023-12-02 16:23:08,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2023-12-02 16:23:08,955 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:23:08,955 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:23:08,960 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2023-12-02 16:23:09,156 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:23:09,156 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:23:09,156 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:23:09,157 INFO L85 PathProgramCache]: Analyzing trace with hash 921357490, now seen corresponding path program 1 times [2023-12-02 16:23:09,157 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:23:09,157 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [770671233] [2023-12-02 16:23:09,157 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:23:09,157 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:23:09,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:23:09,208 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 40 proven. 5 refuted. 0 times theorem prover too weak. 59 trivial. 0 not checked. [2023-12-02 16:23:09,208 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:23:09,209 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [770671233] [2023-12-02 16:23:09,209 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [770671233] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:23:09,209 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2013867329] [2023-12-02 16:23:09,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:23:09,209 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:23:09,209 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:23:09,210 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:23:09,211 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2023-12-02 16:23:09,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:23:09,331 INFO L262 TraceCheckSpWp]: Trace formula consists of 733 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 16:23:09,334 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:23:09,361 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 99 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-12-02 16:23:09,361 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:23:09,362 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2013867329] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:23:09,362 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:23:09,362 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 4 [2023-12-02 16:23:09,362 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [187424471] [2023-12-02 16:23:09,362 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:23:09,362 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:23:09,362 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:23:09,363 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:23:09,363 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 16:23:09,363 INFO L87 Difference]: Start difference. First operand 153606 states and 196355 transitions. Second operand has 3 states, 3 states have (on average 43.0) internal successors, (129), 3 states have internal predecessors, (129), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 16:23:17,558 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:23:17,558 INFO L93 Difference]: Finished difference Result 263896 states and 339507 transitions. [2023-12-02 16:23:17,559 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:23:17,559 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 43.0) internal successors, (129), 3 states have internal predecessors, (129), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 155 [2023-12-02 16:23:17,559 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:23:17,854 INFO L225 Difference]: With dead ends: 263896 [2023-12-02 16:23:17,854 INFO L226 Difference]: Without dead ends: 153540 [2023-12-02 16:23:17,940 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 156 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 16:23:17,941 INFO L413 NwaCegarLoop]: 256 mSDtfsCounter, 128 mSDsluCounter, 133 mSDsCounter, 0 mSdLazyCounter, 81 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 128 SdHoareTripleChecker+Valid, 389 SdHoareTripleChecker+Invalid, 83 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 81 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:23:17,941 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [128 Valid, 389 Invalid, 83 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 81 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:23:18,045 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 153540 states. [2023-12-02 16:23:26,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 153540 to 151152. [2023-12-02 16:23:26,748 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 151152 states, 134502 states have (on average 1.2847764345511592) internal successors, (172805), 134600 states have internal predecessors, (172805), 8739 states have call successors, (8739), 7911 states have call predecessors, (8739), 7910 states have return successors, (9057), 8641 states have call predecessors, (9057), 8737 states have call successors, (9057) [2023-12-02 16:23:27,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151152 states to 151152 states and 190601 transitions. [2023-12-02 16:23:27,018 INFO L78 Accepts]: Start accepts. Automaton has 151152 states and 190601 transitions. Word has length 155 [2023-12-02 16:23:27,018 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:23:27,018 INFO L495 AbstractCegarLoop]: Abstraction has 151152 states and 190601 transitions. [2023-12-02 16:23:27,018 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 43.0) internal successors, (129), 3 states have internal predecessors, (129), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 16:23:27,018 INFO L276 IsEmpty]: Start isEmpty. Operand 151152 states and 190601 transitions. [2023-12-02 16:23:27,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2023-12-02 16:23:27,103 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:23:27,103 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:23:27,107 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Ended with exit code 0 [2023-12-02 16:23:27,303 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:23:27,303 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:23:27,304 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:23:27,304 INFO L85 PathProgramCache]: Analyzing trace with hash 1245721396, now seen corresponding path program 1 times [2023-12-02 16:23:27,304 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:23:27,304 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1799392534] [2023-12-02 16:23:27,304 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:23:27,304 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:23:27,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:23:27,539 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 57 proven. 23 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-12-02 16:23:27,539 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:23:27,539 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1799392534] [2023-12-02 16:23:27,539 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1799392534] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:23:27,539 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [847132170] [2023-12-02 16:23:27,539 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:23:27,539 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:23:27,539 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:23:27,540 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:23:27,546 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2023-12-02 16:23:27,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:23:27,709 INFO L262 TraceCheckSpWp]: Trace formula consists of 737 conjuncts, 22 conjunts are in the unsatisfiable core [2023-12-02 16:23:27,714 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:23:27,774 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 105 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 16:23:27,774 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:23:27,775 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [847132170] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:23:27,775 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:23:27,775 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [5] total 6 [2023-12-02 16:23:27,775 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1186847170] [2023-12-02 16:23:27,775 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:23:27,775 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 16:23:27,776 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:23:27,776 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 16:23:27,776 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-12-02 16:23:27,776 INFO L87 Difference]: Start difference. First operand 151152 states and 190601 transitions. Second operand has 6 states, 6 states have (on average 22.333333333333332) internal successors, (134), 6 states have internal predecessors, (134), 5 states have call successors, (12), 5 states have call predecessors, (12), 5 states have return successors, (11), 5 states have call predecessors, (11), 5 states have call successors, (11) [2023-12-02 16:23:37,801 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:23:37,801 INFO L93 Difference]: Finished difference Result 286259 states and 362367 transitions. [2023-12-02 16:23:37,801 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-12-02 16:23:37,801 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 22.333333333333332) internal successors, (134), 6 states have internal predecessors, (134), 5 states have call successors, (12), 5 states have call predecessors, (12), 5 states have return successors, (11), 5 states have call predecessors, (11), 5 states have call successors, (11) Word has length 157 [2023-12-02 16:23:37,802 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:23:38,160 INFO L225 Difference]: With dead ends: 286259 [2023-12-02 16:23:38,160 INFO L226 Difference]: Without dead ends: 185005 [2023-12-02 16:23:38,238 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 164 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2023-12-02 16:23:38,239 INFO L413 NwaCegarLoop]: 246 mSDtfsCounter, 276 mSDsluCounter, 435 mSDsCounter, 0 mSdLazyCounter, 327 mSolverCounterSat, 50 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 293 SdHoareTripleChecker+Valid, 681 SdHoareTripleChecker+Invalid, 377 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 50 IncrementalHoareTripleChecker+Valid, 327 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 16:23:38,239 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [293 Valid, 681 Invalid, 377 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [50 Valid, 327 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 16:23:38,366 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185005 states. [2023-12-02 16:23:47,898 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 185005 to 160020. [2023-12-02 16:23:47,968 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 160020 states, 141926 states have (on average 1.2789129546383327) internal successors, (181511), 142025 states have internal predecessors, (181511), 9634 states have call successors, (9634), 8582 states have call predecessors, (9634), 8459 states have return successors, (10132), 9413 states have call predecessors, (10132), 9632 states have call successors, (10132) [2023-12-02 16:23:48,406 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160020 states to 160020 states and 201277 transitions. [2023-12-02 16:23:48,413 INFO L78 Accepts]: Start accepts. Automaton has 160020 states and 201277 transitions. Word has length 157 [2023-12-02 16:23:48,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:23:48,414 INFO L495 AbstractCegarLoop]: Abstraction has 160020 states and 201277 transitions. [2023-12-02 16:23:48,414 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 22.333333333333332) internal successors, (134), 6 states have internal predecessors, (134), 5 states have call successors, (12), 5 states have call predecessors, (12), 5 states have return successors, (11), 5 states have call predecessors, (11), 5 states have call successors, (11) [2023-12-02 16:23:48,414 INFO L276 IsEmpty]: Start isEmpty. Operand 160020 states and 201277 transitions. [2023-12-02 16:23:48,490 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 152 [2023-12-02 16:23:48,490 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:23:48,490 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:23:48,495 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2023-12-02 16:23:48,691 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2023-12-02 16:23:48,691 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:23:48,691 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:23:48,691 INFO L85 PathProgramCache]: Analyzing trace with hash 1509691772, now seen corresponding path program 1 times [2023-12-02 16:23:48,691 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:23:48,691 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [361445206] [2023-12-02 16:23:48,691 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:23:48,692 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:23:48,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:23:48,932 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 17 proven. 38 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2023-12-02 16:23:48,932 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:23:48,932 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [361445206] [2023-12-02 16:23:48,932 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [361445206] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:23:48,932 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1708125416] [2023-12-02 16:23:48,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:23:48,933 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:23:48,933 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:23:48,934 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:23:48,936 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2023-12-02 16:23:49,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:23:49,125 INFO L262 TraceCheckSpWp]: Trace formula consists of 810 conjuncts, 16 conjunts are in the unsatisfiable core [2023-12-02 16:23:49,129 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:23:49,303 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 74 proven. 20 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-12-02 16:23:49,303 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:23:51,050 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 17 proven. 3 refuted. 0 times theorem prover too weak. 80 trivial. 0 not checked. [2023-12-02 16:23:51,050 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1708125416] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:23:51,050 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [135414072] [2023-12-02 16:23:51,053 INFO L159 IcfgInterpreter]: Started Sifa with 87 locations of interest [2023-12-02 16:23:51,053 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:23:51,053 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:23:51,054 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:23:51,054 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:23:56,243 INFO L197 IcfgInterpreter]: Interpreting procedure error with input of size 47 for LOIs [2023-12-02 16:23:56,247 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events with input of size 123 for LOIs [2023-12-02 16:23:56,355 INFO L197 IcfgInterpreter]: Interpreting procedure fire_delta_events with input of size 134 for LOIs [2023-12-02 16:23:56,440 INFO L197 IcfgInterpreter]: Interpreting procedure update_channels with input of size 1 for LOIs [2023-12-02 16:23:56,441 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread with input of size 1 for LOIs [2023-12-02 16:23:56,460 INFO L197 IcfgInterpreter]: Interpreting procedure immediate_notify with input of size 66 for LOIs [2023-12-02 16:23:56,561 INFO L197 IcfgInterpreter]: Interpreting procedure activate_threads with input of size 1 for LOIs [2023-12-02 16:23:56,620 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:24:05,983 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4279752#(and (<= 1 |#StackHeapBarrier|) (= 0 ~t5_pc~0) (= ~t1_i~0 1) (= 0 ~t3_pc~0) (= ~m_pc~0 1) (= ~m_i~0 1) (= ~t2_i~0 1) (= 0 ~t2_pc~0) (= ~m_st~0 1) (= ~t5_i~0 1) (exists ((|v_ULTIMATE.start_eval_~tmp_ndt_1~0#1_BEFORE_CALL_27| Int)) (and (not (= |v_ULTIMATE.start_eval_~tmp_ndt_1~0#1_BEFORE_CALL_27| 0)) (<= |v_ULTIMATE.start_eval_~tmp_ndt_1~0#1_BEFORE_CALL_27| 2147483647) (<= 0 (+ 2147483648 |v_ULTIMATE.start_eval_~tmp_ndt_1~0#1_BEFORE_CALL_27|)))) (= 0 ~t4_pc~0) (= ~t3_i~0 1) (= ~t4_i~0 1) (<= 0 ~t1_pc~0) (not (= ~token~0 (+ 5 ~local~0))))' at error location [2023-12-02 16:24:05,983 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:24:05,983 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:24:05,983 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 6] total 17 [2023-12-02 16:24:05,983 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1262126054] [2023-12-02 16:24:05,983 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:24:05,984 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-12-02 16:24:05,984 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:24:05,984 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-12-02 16:24:05,987 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=565, Invalid=7267, Unknown=0, NotChecked=0, Total=7832 [2023-12-02 16:24:05,987 INFO L87 Difference]: Start difference. First operand 160020 states and 201277 transitions. Second operand has 17 states, 14 states have (on average 13.142857142857142) internal successors, (184), 15 states have internal predecessors, (184), 7 states have call successors, (31), 4 states have call predecessors, (31), 7 states have return successors, (30), 6 states have call predecessors, (30), 7 states have call successors, (30) [2023-12-02 16:24:37,359 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:24:37,359 INFO L93 Difference]: Finished difference Result 515432 states and 670869 transitions. [2023-12-02 16:24:37,359 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 191 states. [2023-12-02 16:24:37,360 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 14 states have (on average 13.142857142857142) internal successors, (184), 15 states have internal predecessors, (184), 7 states have call successors, (31), 4 states have call predecessors, (31), 7 states have return successors, (30), 6 states have call predecessors, (30), 7 states have call successors, (30) Word has length 151 [2023-12-02 16:24:37,360 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:24:38,144 INFO L225 Difference]: With dead ends: 515432 [2023-12-02 16:24:38,145 INFO L226 Difference]: Without dead ends: 373020 [2023-12-02 16:24:38,260 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 741 GetRequests, 476 SyntacticMatches, 0 SemanticMatches, 265 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29492 ImplicationChecksByTransitivity, 13.7s TimeCoverageRelationStatistics Valid=4636, Invalid=66386, Unknown=0, NotChecked=0, Total=71022 [2023-12-02 16:24:38,260 INFO L413 NwaCegarLoop]: 1064 mSDtfsCounter, 4007 mSDsluCounter, 9053 mSDsCounter, 0 mSdLazyCounter, 4504 mSolverCounterSat, 541 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4020 SdHoareTripleChecker+Valid, 10117 SdHoareTripleChecker+Invalid, 5045 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 541 IncrementalHoareTripleChecker+Valid, 4504 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.8s IncrementalHoareTripleChecker+Time [2023-12-02 16:24:38,261 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4020 Valid, 10117 Invalid, 5045 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [541 Valid, 4504 Invalid, 0 Unknown, 0 Unchecked, 2.8s Time] [2023-12-02 16:24:38,503 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 373020 states. [2023-12-02 16:24:50,487 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 373020 to 147170. [2023-12-02 16:24:50,545 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 147170 states, 131356 states have (on average 1.2772846310789001) internal successors, (167779), 131468 states have internal predecessors, (167779), 8232 states have call successors, (8232), 7680 states have call predecessors, (8232), 7581 states have return successors, (8646), 8022 states have call predecessors, (8646), 8230 states have call successors, (8646) [2023-12-02 16:24:50,802 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147170 states to 147170 states and 184657 transitions. [2023-12-02 16:24:50,809 INFO L78 Accepts]: Start accepts. Automaton has 147170 states and 184657 transitions. Word has length 151 [2023-12-02 16:24:50,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:24:50,809 INFO L495 AbstractCegarLoop]: Abstraction has 147170 states and 184657 transitions. [2023-12-02 16:24:50,809 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 14 states have (on average 13.142857142857142) internal successors, (184), 15 states have internal predecessors, (184), 7 states have call successors, (31), 4 states have call predecessors, (31), 7 states have return successors, (30), 6 states have call predecessors, (30), 7 states have call successors, (30) [2023-12-02 16:24:50,809 INFO L276 IsEmpty]: Start isEmpty. Operand 147170 states and 184657 transitions. [2023-12-02 16:24:50,900 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2023-12-02 16:24:50,900 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:24:50,901 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:24:50,906 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2023-12-02 16:24:51,101 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2023-12-02 16:24:51,101 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:24:51,101 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:24:51,102 INFO L85 PathProgramCache]: Analyzing trace with hash 621657544, now seen corresponding path program 1 times [2023-12-02 16:24:51,102 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:24:51,102 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [958679554] [2023-12-02 16:24:51,102 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:24:51,102 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:24:51,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:24:51,406 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 17 proven. 37 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2023-12-02 16:24:51,406 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:24:51,407 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [958679554] [2023-12-02 16:24:51,407 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [958679554] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:24:51,407 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [915119334] [2023-12-02 16:24:51,407 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:24:51,407 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:24:51,407 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:24:51,408 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:24:51,411 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2023-12-02 16:24:51,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:24:51,575 INFO L262 TraceCheckSpWp]: Trace formula consists of 820 conjuncts, 17 conjunts are in the unsatisfiable core [2023-12-02 16:24:51,577 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:24:51,745 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 72 proven. 20 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-12-02 16:24:51,745 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:24:53,371 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 17 proven. 3 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2023-12-02 16:24:53,371 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [915119334] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:24:53,371 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1170687161] [2023-12-02 16:24:53,374 INFO L159 IcfgInterpreter]: Started Sifa with 90 locations of interest [2023-12-02 16:24:53,374 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:24:53,375 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:24:53,375 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:24:53,375 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:24:58,885 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events with input of size 123 for LOIs [2023-12-02 16:24:58,992 INFO L197 IcfgInterpreter]: Interpreting procedure fire_delta_events with input of size 134 for LOIs [2023-12-02 16:24:59,073 INFO L197 IcfgInterpreter]: Interpreting procedure update_channels with input of size 1 for LOIs [2023-12-02 16:24:59,074 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread with input of size 1 for LOIs [2023-12-02 16:24:59,086 INFO L197 IcfgInterpreter]: Interpreting procedure immediate_notify with input of size 66 for LOIs [2023-12-02 16:24:59,187 INFO L197 IcfgInterpreter]: Interpreting procedure activate_threads with input of size 1 for LOIs [2023-12-02 16:24:59,346 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:25:08,919 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [1170687161] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:25:08,919 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:25:08,920 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [71] imperfect sequences [8, 10, 6] total 86 [2023-12-02 16:25:08,920 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [34199102] [2023-12-02 16:25:08,920 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:25:08,921 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 71 states [2023-12-02 16:25:08,921 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:25:08,922 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2023-12-02 16:25:08,923 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=503, Invalid=6807, Unknown=0, NotChecked=0, Total=7310 [2023-12-02 16:25:08,924 INFO L87 Difference]: Start difference. First operand 147170 states and 184657 transitions. Second operand has 71 states, 60 states have (on average 1.2333333333333334) internal successors, (74), 59 states have internal predecessors, (74), 13 states have call successors, (14), 5 states have call predecessors, (14), 5 states have return successors, (13), 13 states have call predecessors, (13), 12 states have call successors, (13) [2023-12-02 16:25:58,768 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:25:58,768 INFO L93 Difference]: Finished difference Result 365066 states and 455241 transitions. [2023-12-02 16:25:58,769 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 233 states. [2023-12-02 16:25:58,769 INFO L78 Accepts]: Start accepts. Automaton has has 71 states, 60 states have (on average 1.2333333333333334) internal successors, (74), 59 states have internal predecessors, (74), 13 states have call successors, (14), 5 states have call predecessors, (14), 5 states have return successors, (13), 13 states have call predecessors, (13), 12 states have call successors, (13) Word has length 153 [2023-12-02 16:25:58,769 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:25:59,271 INFO L225 Difference]: With dead ends: 365066 [2023-12-02 16:25:59,271 INFO L226 Difference]: Without dead ends: 202739 [2023-12-02 16:25:59,391 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 677 GetRequests, 387 SyntacticMatches, 5 SemanticMatches, 285 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33285 ImplicationChecksByTransitivity, 34.9s TimeCoverageRelationStatistics Valid=4432, Invalid=77650, Unknown=0, NotChecked=0, Total=82082 [2023-12-02 16:25:59,392 INFO L413 NwaCegarLoop]: 200 mSDtfsCounter, 2871 mSDsluCounter, 4173 mSDsCounter, 0 mSdLazyCounter, 11502 mSolverCounterSat, 227 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2905 SdHoareTripleChecker+Valid, 4373 SdHoareTripleChecker+Invalid, 11729 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 227 IncrementalHoareTripleChecker+Valid, 11502 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 10.4s IncrementalHoareTripleChecker+Time [2023-12-02 16:25:59,392 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2905 Valid, 4373 Invalid, 11729 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [227 Valid, 11502 Invalid, 0 Unknown, 0 Unchecked, 10.4s Time] [2023-12-02 16:25:59,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202739 states. [2023-12-02 16:26:11,827 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202739 to 152702. [2023-12-02 16:26:11,889 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 152702 states, 136327 states have (on average 1.2736215129798205) internal successors, (173629), 136542 states have internal predecessors, (173629), 8638 states have call successors, (8638), 7832 states have call predecessors, (8638), 7736 states have return successors, (9064), 8328 states have call predecessors, (9064), 8636 states have call successors, (9064) [2023-12-02 16:26:12,332 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152702 states to 152702 states and 191331 transitions. [2023-12-02 16:26:12,337 INFO L78 Accepts]: Start accepts. Automaton has 152702 states and 191331 transitions. Word has length 153 [2023-12-02 16:26:12,337 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:26:12,337 INFO L495 AbstractCegarLoop]: Abstraction has 152702 states and 191331 transitions. [2023-12-02 16:26:12,337 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 71 states, 60 states have (on average 1.2333333333333334) internal successors, (74), 59 states have internal predecessors, (74), 13 states have call successors, (14), 5 states have call predecessors, (14), 5 states have return successors, (13), 13 states have call predecessors, (13), 12 states have call successors, (13) [2023-12-02 16:26:12,338 INFO L276 IsEmpty]: Start isEmpty. Operand 152702 states and 191331 transitions. [2023-12-02 16:26:12,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2023-12-02 16:26:12,382 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:26:12,382 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:26:12,387 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Ended with exit code 0 [2023-12-02 16:26:12,582 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2023-12-02 16:26:12,582 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:26:12,583 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:26:12,583 INFO L85 PathProgramCache]: Analyzing trace with hash 1022821406, now seen corresponding path program 1 times [2023-12-02 16:26:12,583 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:26:12,583 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [509859539] [2023-12-02 16:26:12,583 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:26:12,583 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:26:12,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:26:12,768 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 17 proven. 38 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2023-12-02 16:26:12,769 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:26:12,769 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [509859539] [2023-12-02 16:26:12,769 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [509859539] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:26:12,769 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2001453488] [2023-12-02 16:26:12,769 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:26:12,769 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:26:12,769 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:26:12,770 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:26:12,771 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2023-12-02 16:26:12,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:26:12,909 INFO L262 TraceCheckSpWp]: Trace formula consists of 819 conjuncts, 17 conjunts are in the unsatisfiable core [2023-12-02 16:26:12,912 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:26:13,080 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 74 proven. 20 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-12-02 16:26:13,081 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:26:14,749 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 17 proven. 3 refuted. 0 times theorem prover too weak. 80 trivial. 0 not checked. [2023-12-02 16:26:14,749 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2001453488] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:26:14,750 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [439291413] [2023-12-02 16:26:14,752 INFO L159 IcfgInterpreter]: Started Sifa with 90 locations of interest [2023-12-02 16:26:14,752 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:26:14,753 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:26:14,753 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:26:14,753 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:26:22,179 INFO L197 IcfgInterpreter]: Interpreting procedure error with input of size 47 for LOIs [2023-12-02 16:26:22,183 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events with input of size 123 for LOIs [2023-12-02 16:26:22,290 INFO L197 IcfgInterpreter]: Interpreting procedure fire_delta_events with input of size 134 for LOIs [2023-12-02 16:26:22,384 INFO L197 IcfgInterpreter]: Interpreting procedure update_channels with input of size 1 for LOIs [2023-12-02 16:26:22,384 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread with input of size 1 for LOIs [2023-12-02 16:26:22,398 INFO L197 IcfgInterpreter]: Interpreting procedure immediate_notify with input of size 66 for LOIs [2023-12-02 16:26:22,625 INFO L197 IcfgInterpreter]: Interpreting procedure activate_threads with input of size 1 for LOIs [2023-12-02 16:26:22,749 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:26:35,952 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5674525#(and (<= 1 |#StackHeapBarrier|) (= 0 ~t5_pc~0) (= ~t1_i~0 1) (exists ((|v_ULTIMATE.start_eval_~tmp_ndt_1~0#1_BEFORE_CALL_42| Int)) (and (<= |v_ULTIMATE.start_eval_~tmp_ndt_1~0#1_BEFORE_CALL_42| 2147483647) (<= 0 (+ 2147483648 |v_ULTIMATE.start_eval_~tmp_ndt_1~0#1_BEFORE_CALL_42|)) (not (= |v_ULTIMATE.start_eval_~tmp_ndt_1~0#1_BEFORE_CALL_42| 0)))) (<= 0 ~t2_pc~0) (= 0 ~t3_pc~0) (= ~m_pc~0 1) (= ~m_i~0 1) (= ~t2_i~0 1) (= ~m_st~0 1) (= ~t5_i~0 1) (= 0 ~t4_pc~0) (= ~t3_i~0 1) (= ~t4_i~0 1) (<= 0 ~t1_pc~0) (not (= ~token~0 (+ 5 ~local~0))))' at error location [2023-12-02 16:26:35,952 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:26:35,952 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:26:35,953 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 10, 6] total 18 [2023-12-02 16:26:35,953 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1327213611] [2023-12-02 16:26:35,953 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:26:35,954 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-12-02 16:26:35,954 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:26:35,954 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-12-02 16:26:35,955 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=572, Invalid=7984, Unknown=0, NotChecked=0, Total=8556 [2023-12-02 16:26:35,955 INFO L87 Difference]: Start difference. First operand 152702 states and 191331 transitions. Second operand has 18 states, 15 states have (on average 12.533333333333333) internal successors, (188), 16 states have internal predecessors, (188), 7 states have call successors, (31), 4 states have call predecessors, (31), 7 states have return successors, (30), 6 states have call predecessors, (30), 7 states have call successors, (30) [2023-12-02 16:27:14,328 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:27:14,329 INFO L93 Difference]: Finished difference Result 454651 states and 587604 transitions. [2023-12-02 16:27:14,329 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 218 states. [2023-12-02 16:27:14,329 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 15 states have (on average 12.533333333333333) internal successors, (188), 16 states have internal predecessors, (188), 7 states have call successors, (31), 4 states have call predecessors, (31), 7 states have return successors, (30), 6 states have call predecessors, (30), 7 states have call successors, (30) Word has length 154 [2023-12-02 16:27:14,330 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:27:15,199 INFO L225 Difference]: With dead ends: 454651 [2023-12-02 16:27:15,199 INFO L226 Difference]: Without dead ends: 337654 [2023-12-02 16:27:15,295 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 794 GetRequests, 499 SyntacticMatches, 0 SemanticMatches, 295 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37081 ImplicationChecksByTransitivity, 18.2s TimeCoverageRelationStatistics Valid=5539, Invalid=82373, Unknown=0, NotChecked=0, Total=87912 [2023-12-02 16:27:15,296 INFO L413 NwaCegarLoop]: 1221 mSDtfsCounter, 3950 mSDsluCounter, 8579 mSDsCounter, 0 mSdLazyCounter, 5024 mSolverCounterSat, 632 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3962 SdHoareTripleChecker+Valid, 9800 SdHoareTripleChecker+Invalid, 5656 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 632 IncrementalHoareTripleChecker+Valid, 5024 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:27:15,296 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3962 Valid, 9800 Invalid, 5656 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [632 Valid, 5024 Invalid, 0 Unknown, 0 Unchecked, 3.1s Time] [2023-12-02 16:27:15,500 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 337654 states. [2023-12-02 16:27:29,490 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 337654 to 141441. [2023-12-02 16:27:29,549 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141441 states, 126518 states have (on average 1.270333075135554) internal successors, (160720), 126781 states have internal predecessors, (160720), 7802 states have call successors, (7802), 7202 states have call predecessors, (7802), 7120 states have return successors, (8214), 7458 states have call predecessors, (8214), 7800 states have call successors, (8214) [2023-12-02 16:27:29,936 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141441 states to 141441 states and 176736 transitions. [2023-12-02 16:27:29,939 INFO L78 Accepts]: Start accepts. Automaton has 141441 states and 176736 transitions. Word has length 154 [2023-12-02 16:27:29,939 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:27:29,939 INFO L495 AbstractCegarLoop]: Abstraction has 141441 states and 176736 transitions. [2023-12-02 16:27:29,939 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 15 states have (on average 12.533333333333333) internal successors, (188), 16 states have internal predecessors, (188), 7 states have call successors, (31), 4 states have call predecessors, (31), 7 states have return successors, (30), 6 states have call predecessors, (30), 7 states have call successors, (30) [2023-12-02 16:27:29,939 INFO L276 IsEmpty]: Start isEmpty. Operand 141441 states and 176736 transitions. [2023-12-02 16:27:29,976 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2023-12-02 16:27:29,976 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:27:29,976 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:27:29,981 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Ended with exit code 0 [2023-12-02 16:27:30,177 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2023-12-02 16:27:30,177 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:27:30,177 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:27:30,177 INFO L85 PathProgramCache]: Analyzing trace with hash -712498376, now seen corresponding path program 1 times [2023-12-02 16:27:30,177 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:27:30,177 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1720599629] [2023-12-02 16:27:30,178 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:27:30,178 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:27:30,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:27:30,388 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 17 proven. 36 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2023-12-02 16:27:30,388 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:27:30,388 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1720599629] [2023-12-02 16:27:30,388 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1720599629] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:27:30,388 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [899015481] [2023-12-02 16:27:30,388 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:27:30,388 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:27:30,388 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:27:30,389 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:27:30,390 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2023-12-02 16:27:30,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:27:30,539 INFO L262 TraceCheckSpWp]: Trace formula consists of 830 conjuncts, 18 conjunts are in the unsatisfiable core [2023-12-02 16:27:30,542 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:27:30,752 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 70 proven. 20 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-12-02 16:27:30,752 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:27:32,542 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 17 proven. 3 refuted. 0 times theorem prover too weak. 76 trivial. 0 not checked. [2023-12-02 16:27:32,542 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [899015481] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:27:32,542 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1075056409] [2023-12-02 16:27:32,544 INFO L159 IcfgInterpreter]: Started Sifa with 93 locations of interest [2023-12-02 16:27:32,544 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:27:32,545 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:27:32,545 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:27:32,545 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:27:39,219 INFO L197 IcfgInterpreter]: Interpreting procedure error with input of size 47 for LOIs [2023-12-02 16:27:39,223 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events with input of size 33 for LOIs [2023-12-02 16:27:39,299 INFO L197 IcfgInterpreter]: Interpreting procedure fire_delta_events with input of size 43 for LOIs [2023-12-02 16:27:39,322 INFO L197 IcfgInterpreter]: Interpreting procedure update_channels with input of size 117 for LOIs [2023-12-02 16:27:39,387 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread with input of size 1 for LOIs [2023-12-02 16:27:39,400 INFO L197 IcfgInterpreter]: Interpreting procedure immediate_notify with input of size 66 for LOIs [2023-12-02 16:27:39,527 INFO L197 IcfgInterpreter]: Interpreting procedure activate_threads with input of size 79 for LOIs [2023-12-02 16:27:40,073 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:27:55,071 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6388891#(and (<= 1 |#StackHeapBarrier|) (= 0 ~t5_pc~0) (= ~t1_i~0 1) (<= 0 ~t2_pc~0) (= ~m_pc~0 1) (exists ((|v_ULTIMATE.start_eval_~tmp_ndt_1~0#1_BEFORE_CALL_50| Int)) (and (not (= |v_ULTIMATE.start_eval_~tmp_ndt_1~0#1_BEFORE_CALL_50| 0)) (<= |v_ULTIMATE.start_eval_~tmp_ndt_1~0#1_BEFORE_CALL_50| 2147483647) (<= 0 (+ 2147483648 |v_ULTIMATE.start_eval_~tmp_ndt_1~0#1_BEFORE_CALL_50|)))) (= ~m_i~0 1) (= ~t2_i~0 1) (= ~m_st~0 1) (= ~t5_i~0 1) (<= 0 ~t3_pc~0) (= 0 ~t4_pc~0) (= ~t3_i~0 1) (= ~t4_i~0 1) (<= 0 ~t1_pc~0) (not (= ~token~0 (+ 5 ~local~0))))' at error location [2023-12-02 16:27:55,071 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:27:55,071 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:27:55,071 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11, 6] total 19 [2023-12-02 16:27:55,071 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1358002887] [2023-12-02 16:27:55,071 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:27:55,072 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2023-12-02 16:27:55,072 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:27:55,073 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2023-12-02 16:27:55,074 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=641, Invalid=8865, Unknown=0, NotChecked=0, Total=9506 [2023-12-02 16:27:55,074 INFO L87 Difference]: Start difference. First operand 141441 states and 176736 transitions. Second operand has 19 states, 16 states have (on average 11.875) internal successors, (190), 17 states have internal predecessors, (190), 7 states have call successors, (31), 4 states have call predecessors, (31), 7 states have return successors, (30), 6 states have call predecessors, (30), 7 states have call successors, (30) [2023-12-02 16:28:23,616 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:28:23,616 INFO L93 Difference]: Finished difference Result 295768 states and 378480 transitions. [2023-12-02 16:28:23,616 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 213 states. [2023-12-02 16:28:23,617 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 16 states have (on average 11.875) internal successors, (190), 17 states have internal predecessors, (190), 7 states have call successors, (31), 4 states have call predecessors, (31), 7 states have return successors, (30), 6 states have call predecessors, (30), 7 states have call successors, (30) Word has length 155 [2023-12-02 16:28:23,617 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:28:24,025 INFO L225 Difference]: With dead ends: 295768 [2023-12-02 16:28:24,025 INFO L226 Difference]: Without dead ends: 205119 [2023-12-02 16:28:24,102 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 777 GetRequests, 483 SyntacticMatches, 0 SemanticMatches, 294 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38059 ImplicationChecksByTransitivity, 19.8s TimeCoverageRelationStatistics Valid=5495, Invalid=81825, Unknown=0, NotChecked=0, Total=87320 [2023-12-02 16:28:24,102 INFO L413 NwaCegarLoop]: 1300 mSDtfsCounter, 3581 mSDsluCounter, 7820 mSDsCounter, 0 mSdLazyCounter, 4984 mSolverCounterSat, 615 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3592 SdHoareTripleChecker+Valid, 9120 SdHoareTripleChecker+Invalid, 5599 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 615 IncrementalHoareTripleChecker+Valid, 4984 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.9s IncrementalHoareTripleChecker+Time [2023-12-02 16:28:24,102 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3592 Valid, 9120 Invalid, 5599 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [615 Valid, 4984 Invalid, 0 Unknown, 0 Unchecked, 2.9s Time] [2023-12-02 16:28:24,236 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205119 states. [2023-12-02 16:28:35,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205119 to 117596. [2023-12-02 16:28:35,817 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117596 states, 105190 states have (on average 1.2713470862249263) internal successors, (133733), 105435 states have internal predecessors, (133733), 6431 states have call successors, (6431), 6053 states have call predecessors, (6431), 5974 states have return successors, (6825), 6108 states have call predecessors, (6825), 6429 states have call successors, (6825) [2023-12-02 16:28:36,000 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117596 states to 117596 states and 146989 transitions. [2023-12-02 16:28:36,003 INFO L78 Accepts]: Start accepts. Automaton has 117596 states and 146989 transitions. Word has length 155 [2023-12-02 16:28:36,003 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:28:36,003 INFO L495 AbstractCegarLoop]: Abstraction has 117596 states and 146989 transitions. [2023-12-02 16:28:36,003 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 16 states have (on average 11.875) internal successors, (190), 17 states have internal predecessors, (190), 7 states have call successors, (31), 4 states have call predecessors, (31), 7 states have return successors, (30), 6 states have call predecessors, (30), 7 states have call successors, (30) [2023-12-02 16:28:36,003 INFO L276 IsEmpty]: Start isEmpty. Operand 117596 states and 146989 transitions. [2023-12-02 16:28:36,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2023-12-02 16:28:36,021 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:28:36,022 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:28:36,026 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Ended with exit code 0 [2023-12-02 16:28:36,222 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:28:36,222 INFO L420 AbstractCegarLoop]: === Iteration 31 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:28:36,222 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:28:36,223 INFO L85 PathProgramCache]: Analyzing trace with hash 87103471, now seen corresponding path program 1 times [2023-12-02 16:28:36,223 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:28:36,223 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1148158465] [2023-12-02 16:28:36,223 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:28:36,223 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:28:36,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:28:36,470 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 17 proven. 35 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2023-12-02 16:28:36,470 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:28:36,470 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1148158465] [2023-12-02 16:28:36,470 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1148158465] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:28:36,470 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [923895755] [2023-12-02 16:28:36,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:28:36,470 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:28:36,470 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:28:36,471 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:28:36,473 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2023-12-02 16:28:36,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:28:36,610 INFO L262 TraceCheckSpWp]: Trace formula consists of 840 conjuncts, 19 conjunts are in the unsatisfiable core [2023-12-02 16:28:36,613 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:28:36,849 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 68 proven. 20 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-12-02 16:28:36,849 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:28:38,391 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 17 proven. 3 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2023-12-02 16:28:38,391 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [923895755] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:28:38,391 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [828299142] [2023-12-02 16:28:38,393 INFO L159 IcfgInterpreter]: Started Sifa with 96 locations of interest [2023-12-02 16:28:38,393 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:28:38,394 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:28:38,394 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:28:38,394 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:28:44,927 INFO L197 IcfgInterpreter]: Interpreting procedure error with input of size 57 for LOIs [2023-12-02 16:28:44,933 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events with input of size 33 for LOIs [2023-12-02 16:28:44,954 INFO L197 IcfgInterpreter]: Interpreting procedure fire_delta_events with input of size 44 for LOIs [2023-12-02 16:28:44,978 INFO L197 IcfgInterpreter]: Interpreting procedure update_channels with input of size 119 for LOIs [2023-12-02 16:28:45,042 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread with input of size 1 for LOIs [2023-12-02 16:28:45,055 INFO L197 IcfgInterpreter]: Interpreting procedure immediate_notify with input of size 70 for LOIs [2023-12-02 16:28:45,192 INFO L197 IcfgInterpreter]: Interpreting procedure activate_threads with input of size 80 for LOIs [2023-12-02 16:28:45,848 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:29:03,138 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6882180#(and (<= ~t1_pc~0 1) (<= 1 |#StackHeapBarrier|) (<= ~local~0 2147483647) (= 0 ~t5_pc~0) (exists ((|v_ULTIMATE.start_eval_~tmp_ndt_1~0#1_BEFORE_CALL_56| Int)) (and (<= 0 (+ 2147483648 |v_ULTIMATE.start_eval_~tmp_ndt_1~0#1_BEFORE_CALL_56|)) (not (= |v_ULTIMATE.start_eval_~tmp_ndt_1~0#1_BEFORE_CALL_56| 0)) (<= |v_ULTIMATE.start_eval_~tmp_ndt_1~0#1_BEFORE_CALL_56| 2147483647))) (= ~t1_i~0 1) (<= 0 (+ ~local~0 2147483648)) (<= 0 ~t2_pc~0) (= ~m_pc~0 1) (<= ~t2_pc~0 1) (= ~m_i~0 1) (<= ~t4_pc~0 1) (<= ~t3_pc~0 1) (= ~t2_i~0 1) (= ~m_st~0 1) (<= ~token~0 2147483647) (= ~t5_i~0 1) (<= 0 ~t3_pc~0) (= ~t3_i~0 1) (<= 0 ~t4_pc~0) (= ~t4_i~0 1) (<= 0 (+ ~token~0 2147483648)) (<= 0 ~t1_pc~0) (not (= ~token~0 (+ 5 ~local~0))))' at error location [2023-12-02 16:29:03,138 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:29:03,138 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:29:03,138 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 12, 6] total 20 [2023-12-02 16:29:03,138 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [648438465] [2023-12-02 16:29:03,139 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:29:03,139 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2023-12-02 16:29:03,139 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:29:03,140 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2023-12-02 16:29:03,141 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=657, Invalid=9045, Unknown=0, NotChecked=0, Total=9702 [2023-12-02 16:29:03,141 INFO L87 Difference]: Start difference. First operand 117596 states and 146989 transitions. Second operand has 20 states, 17 states have (on average 11.352941176470589) internal successors, (193), 18 states have internal predecessors, (193), 7 states have call successors, (31), 4 states have call predecessors, (31), 7 states have return successors, (30), 6 states have call predecessors, (30), 7 states have call successors, (30) [2023-12-02 16:29:28,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:29:28,459 INFO L93 Difference]: Finished difference Result 226963 states and 288620 transitions. [2023-12-02 16:29:28,459 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 218 states. [2023-12-02 16:29:28,460 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 17 states have (on average 11.352941176470589) internal successors, (193), 18 states have internal predecessors, (193), 7 states have call successors, (31), 4 states have call predecessors, (31), 7 states have return successors, (30), 6 states have call predecessors, (30), 7 states have call successors, (30) Word has length 157 [2023-12-02 16:29:28,460 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:29:28,774 INFO L225 Difference]: With dead ends: 226963 [2023-12-02 16:29:28,775 INFO L226 Difference]: Without dead ends: 168449 [2023-12-02 16:29:28,835 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 780 GetRequests, 474 SyntacticMatches, 7 SemanticMatches, 299 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40662 ImplicationChecksByTransitivity, 21.2s TimeCoverageRelationStatistics Valid=5590, Invalid=84710, Unknown=0, NotChecked=0, Total=90300 [2023-12-02 16:29:28,836 INFO L413 NwaCegarLoop]: 1087 mSDtfsCounter, 2563 mSDsluCounter, 9351 mSDsCounter, 0 mSdLazyCounter, 6200 mSolverCounterSat, 418 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2573 SdHoareTripleChecker+Valid, 10438 SdHoareTripleChecker+Invalid, 6618 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 418 IncrementalHoareTripleChecker+Valid, 6200 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.3s IncrementalHoareTripleChecker+Time [2023-12-02 16:29:28,836 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2573 Valid, 10438 Invalid, 6618 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [418 Valid, 6200 Invalid, 0 Unknown, 0 Unchecked, 3.3s Time] [2023-12-02 16:29:28,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168449 states. [2023-12-02 16:29:40,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168449 to 109171. [2023-12-02 16:29:40,203 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109171 states, 97593 states have (on average 1.2680417652905434) internal successors, (123752), 97843 states have internal predecessors, (123752), 6000 states have call successors, (6000), 5656 states have call predecessors, (6000), 5577 states have return successors, (6392), 5672 states have call predecessors, (6392), 5998 states have call successors, (6392) [2023-12-02 16:29:40,397 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109171 states to 109171 states and 136144 transitions. [2023-12-02 16:29:40,399 INFO L78 Accepts]: Start accepts. Automaton has 109171 states and 136144 transitions. Word has length 157 [2023-12-02 16:29:40,400 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:29:40,400 INFO L495 AbstractCegarLoop]: Abstraction has 109171 states and 136144 transitions. [2023-12-02 16:29:40,400 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 17 states have (on average 11.352941176470589) internal successors, (193), 18 states have internal predecessors, (193), 7 states have call successors, (31), 4 states have call predecessors, (31), 7 states have return successors, (30), 6 states have call predecessors, (30), 7 states have call successors, (30) [2023-12-02 16:29:40,400 INFO L276 IsEmpty]: Start isEmpty. Operand 109171 states and 136144 transitions. [2023-12-02 16:29:40,424 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2023-12-02 16:29:40,424 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:29:40,424 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:29:40,429 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Ended with exit code 0 [2023-12-02 16:29:40,624 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:29:40,625 INFO L420 AbstractCegarLoop]: === Iteration 32 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:29:40,625 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:29:40,625 INFO L85 PathProgramCache]: Analyzing trace with hash 1200878465, now seen corresponding path program 1 times [2023-12-02 16:29:40,625 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:29:40,625 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [699492591] [2023-12-02 16:29:40,626 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:29:40,626 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:29:40,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:29:41,222 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 25 proven. 41 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2023-12-02 16:29:41,222 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:29:41,222 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [699492591] [2023-12-02 16:29:41,222 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [699492591] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:29:41,222 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1598042035] [2023-12-02 16:29:41,222 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:29:41,222 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:29:41,222 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:29:41,223 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:29:41,224 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2023-12-02 16:29:41,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:29:41,362 INFO L262 TraceCheckSpWp]: Trace formula consists of 850 conjuncts, 32 conjunts are in the unsatisfiable core [2023-12-02 16:29:41,365 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:29:41,669 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 64 proven. 2 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2023-12-02 16:29:41,670 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:29:42,258 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 35 proven. 7 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2023-12-02 16:29:42,258 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1598042035] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:29:42,258 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [199657436] [2023-12-02 16:29:42,260 INFO L159 IcfgInterpreter]: Started Sifa with 99 locations of interest [2023-12-02 16:29:42,260 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:29:42,261 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:29:42,261 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:29:42,261 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:29:51,929 INFO L197 IcfgInterpreter]: Interpreting procedure error with input of size 23 for LOIs [2023-12-02 16:29:51,932 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events with input of size 146 for LOIs [2023-12-02 16:29:52,055 INFO L197 IcfgInterpreter]: Interpreting procedure fire_delta_events with input of size 134 for LOIs [2023-12-02 16:29:52,136 INFO L197 IcfgInterpreter]: Interpreting procedure update_channels with input of size 1 for LOIs [2023-12-02 16:29:52,137 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread with input of size 1 for LOIs [2023-12-02 16:29:52,149 INFO L197 IcfgInterpreter]: Interpreting procedure immediate_notify with input of size 42 for LOIs [2023-12-02 16:29:52,233 INFO L197 IcfgInterpreter]: Interpreting procedure activate_threads with input of size 1 for LOIs [2023-12-02 16:29:52,379 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:30:07,398 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7283045#(and (exists ((|v_ULTIMATE.start_eval_~tmp_ndt_1~0#1_BEFORE_CALL_62| Int)) (and (<= 0 (+ 2147483648 |v_ULTIMATE.start_eval_~tmp_ndt_1~0#1_BEFORE_CALL_62|)) (not (= |v_ULTIMATE.start_eval_~tmp_ndt_1~0#1_BEFORE_CALL_62| 0)) (<= |v_ULTIMATE.start_eval_~tmp_ndt_1~0#1_BEFORE_CALL_62| 2147483647))) (= ~m_pc~0 1) (= ~m_st~0 1) (not (= ~token~0 (+ 5 ~local~0))))' at error location [2023-12-02 16:30:07,398 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:30:07,398 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:30:07,398 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 9, 12] total 36 [2023-12-02 16:30:07,399 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1479062750] [2023-12-02 16:30:07,399 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:30:07,399 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2023-12-02 16:30:07,399 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:30:07,400 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2023-12-02 16:30:07,401 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=688, Invalid=12884, Unknown=0, NotChecked=0, Total=13572 [2023-12-02 16:30:07,401 INFO L87 Difference]: Start difference. First operand 109171 states and 136144 transitions. Second operand has 36 states, 24 states have (on average 11.416666666666666) internal successors, (274), 27 states have internal predecessors, (274), 14 states have call successors, (41), 11 states have call predecessors, (41), 18 states have return successors, (40), 14 states have call predecessors, (40), 14 states have call successors, (40) [2023-12-02 16:30:46,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:30:46,062 INFO L93 Difference]: Finished difference Result 415672 states and 530100 transitions. [2023-12-02 16:30:46,062 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2023-12-02 16:30:46,062 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 24 states have (on average 11.416666666666666) internal successors, (274), 27 states have internal predecessors, (274), 14 states have call successors, (41), 11 states have call predecessors, (41), 18 states have return successors, (40), 14 states have call predecessors, (40), 14 states have call successors, (40) Word has length 159 [2023-12-02 16:30:46,063 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:30:46,771 INFO L225 Difference]: With dead ends: 415672 [2023-12-02 16:30:46,771 INFO L226 Difference]: Without dead ends: 314723 [2023-12-02 16:30:46,880 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 601 GetRequests, 405 SyntacticMatches, 0 SemanticMatches, 196 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14457 ImplicationChecksByTransitivity, 17.8s TimeCoverageRelationStatistics Valid=3200, Invalid=35806, Unknown=0, NotChecked=0, Total=39006 [2023-12-02 16:30:46,880 INFO L413 NwaCegarLoop]: 108 mSDtfsCounter, 11790 mSDsluCounter, 1400 mSDsCounter, 0 mSdLazyCounter, 2845 mSolverCounterSat, 3099 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11790 SdHoareTripleChecker+Valid, 1508 SdHoareTripleChecker+Invalid, 5944 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3099 IncrementalHoareTripleChecker+Valid, 2845 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.8s IncrementalHoareTripleChecker+Time [2023-12-02 16:30:46,881 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11790 Valid, 1508 Invalid, 5944 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3099 Valid, 2845 Invalid, 0 Unknown, 0 Unchecked, 2.8s Time] [2023-12-02 16:30:47,072 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 314723 states. [2023-12-02 16:31:11,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 314723 to 209120. [2023-12-02 16:31:11,445 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 209120 states, 186335 states have (on average 1.2523626801191403) internal successors, (233359), 186619 states have internal predecessors, (233359), 11518 states have call successors, (11518), 11297 states have call predecessors, (11518), 11266 states have return successors, (12120), 11204 states have call predecessors, (12120), 11516 states have call successors, (12120) [2023-12-02 16:31:12,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 209120 states to 209120 states and 256997 transitions. [2023-12-02 16:31:12,078 INFO L78 Accepts]: Start accepts. Automaton has 209120 states and 256997 transitions. Word has length 159 [2023-12-02 16:31:12,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:31:12,078 INFO L495 AbstractCegarLoop]: Abstraction has 209120 states and 256997 transitions. [2023-12-02 16:31:12,078 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 24 states have (on average 11.416666666666666) internal successors, (274), 27 states have internal predecessors, (274), 14 states have call successors, (41), 11 states have call predecessors, (41), 18 states have return successors, (40), 14 states have call predecessors, (40), 14 states have call successors, (40) [2023-12-02 16:31:12,079 INFO L276 IsEmpty]: Start isEmpty. Operand 209120 states and 256997 transitions. [2023-12-02 16:31:12,096 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2023-12-02 16:31:12,096 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:31:12,096 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:31:12,101 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Ended with exit code 0 [2023-12-02 16:31:12,296 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:31:12,297 INFO L420 AbstractCegarLoop]: === Iteration 33 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:31:12,297 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:31:12,297 INFO L85 PathProgramCache]: Analyzing trace with hash 998718632, now seen corresponding path program 1 times [2023-12-02 16:31:12,297 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:31:12,297 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2118905278] [2023-12-02 16:31:12,297 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:31:12,297 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:31:12,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:31:12,353 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 32 proven. 0 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2023-12-02 16:31:12,354 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:31:12,354 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2118905278] [2023-12-02 16:31:12,354 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2118905278] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:31:12,354 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 16:31:12,354 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-12-02 16:31:12,354 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [45879546] [2023-12-02 16:31:12,354 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:31:12,354 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 16:31:12,354 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:31:12,355 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 16:31:12,355 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 16:31:12,355 INFO L87 Difference]: Start difference. First operand 209120 states and 256997 transitions. Second operand has 4 states, 4 states have (on average 24.5) internal successors, (98), 4 states have internal predecessors, (98), 3 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) [2023-12-02 16:31:34,197 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:31:34,198 INFO L93 Difference]: Finished difference Result 372617 states and 462396 transitions. [2023-12-02 16:31:34,198 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 16:31:34,198 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 24.5) internal successors, (98), 4 states have internal predecessors, (98), 3 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) Word has length 160 [2023-12-02 16:31:34,198 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:31:34,624 INFO L225 Difference]: With dead ends: 372617 [2023-12-02 16:31:34,624 INFO L226 Difference]: Without dead ends: 199634 [2023-12-02 16:31:34,739 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 16:31:34,739 INFO L413 NwaCegarLoop]: 263 mSDtfsCounter, 288 mSDsluCounter, 193 mSDsCounter, 0 mSdLazyCounter, 184 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 288 SdHoareTripleChecker+Valid, 456 SdHoareTripleChecker+Invalid, 188 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 184 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 16:31:34,740 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [288 Valid, 456 Invalid, 188 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 184 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 16:31:34,868 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 199634 states. [2023-12-02 16:31:56,220 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 199634 to 184069. [2023-12-02 16:31:56,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 184069 states, 163708 states have (on average 1.229805507366775) internal successors, (201329), 163970 states have internal predecessors, (201329), 10272 states have call successors, (10272), 10111 states have call predecessors, (10272), 10088 states have return successors, (10824), 9988 states have call predecessors, (10824), 10270 states have call successors, (10824) [2023-12-02 16:31:56,790 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184069 states to 184069 states and 222425 transitions. [2023-12-02 16:31:56,798 INFO L78 Accepts]: Start accepts. Automaton has 184069 states and 222425 transitions. Word has length 160 [2023-12-02 16:31:56,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:31:56,799 INFO L495 AbstractCegarLoop]: Abstraction has 184069 states and 222425 transitions. [2023-12-02 16:31:56,799 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 24.5) internal successors, (98), 4 states have internal predecessors, (98), 3 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) [2023-12-02 16:31:56,799 INFO L276 IsEmpty]: Start isEmpty. Operand 184069 states and 222425 transitions. [2023-12-02 16:31:56,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2023-12-02 16:31:56,812 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:31:56,812 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:31:56,812 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2023-12-02 16:31:56,812 INFO L420 AbstractCegarLoop]: === Iteration 34 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:31:56,813 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:31:56,813 INFO L85 PathProgramCache]: Analyzing trace with hash -1800911196, now seen corresponding path program 1 times [2023-12-02 16:31:56,813 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:31:56,813 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1202255714] [2023-12-02 16:31:56,813 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:31:56,813 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:31:56,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:31:57,504 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 29 proven. 43 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-12-02 16:31:57,504 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:31:57,504 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1202255714] [2023-12-02 16:31:57,504 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1202255714] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:31:57,505 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [795385666] [2023-12-02 16:31:57,505 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:31:57,505 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:31:57,505 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:31:57,506 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:31:57,509 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42837bc3-7ccb-4276-a892-aff6f41c7c69/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2023-12-02 16:31:57,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:31:57,655 INFO L262 TraceCheckSpWp]: Trace formula consists of 848 conjuncts, 32 conjunts are in the unsatisfiable core [2023-12-02 16:31:57,658 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:31:58,163 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 68 proven. 2 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2023-12-02 16:31:58,163 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:31:58,751 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 39 proven. 7 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2023-12-02 16:31:58,752 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [795385666] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:31:58,752 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2133376739] [2023-12-02 16:31:58,754 INFO L159 IcfgInterpreter]: Started Sifa with 99 locations of interest [2023-12-02 16:31:58,754 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:31:58,754 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:31:58,754 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:31:58,754 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:32:10,619 INFO L197 IcfgInterpreter]: Interpreting procedure error with input of size 58 for LOIs [2023-12-02 16:32:10,625 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events with input of size 45 for LOIs [2023-12-02 16:32:10,649 INFO L197 IcfgInterpreter]: Interpreting procedure fire_delta_events with input of size 158 for LOIs [2023-12-02 16:32:10,806 INFO L197 IcfgInterpreter]: Interpreting procedure update_channels with input of size 121 for LOIs [2023-12-02 16:32:10,924 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread with input of size 1 for LOIs [2023-12-02 16:32:10,939 INFO L197 IcfgInterpreter]: Interpreting procedure immediate_notify with input of size 71 for LOIs [2023-12-02 16:32:11,158 INFO L197 IcfgInterpreter]: Interpreting procedure activate_threads with input of size 45 for LOIs [2023-12-02 16:32:12,246 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:32:33,868 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8673669#(and (<= ~t1_pc~0 1) (<= 0 ~t5_pc~0) (<= 1 |#StackHeapBarrier|) (<= ~local~0 2147483647) (= ~t1_i~0 1) (<= 0 (+ ~local~0 2147483648)) (<= 0 ~t2_pc~0) (= ~m_pc~0 1) (<= ~t2_pc~0 1) (= ~m_i~0 1) (exists ((|v_ULTIMATE.start_eval_~tmp_ndt_1~0#1_BEFORE_CALL_68| Int)) (and (not (= |v_ULTIMATE.start_eval_~tmp_ndt_1~0#1_BEFORE_CALL_68| 0)) (<= 0 (+ 2147483648 |v_ULTIMATE.start_eval_~tmp_ndt_1~0#1_BEFORE_CALL_68|)) (<= |v_ULTIMATE.start_eval_~tmp_ndt_1~0#1_BEFORE_CALL_68| 2147483647))) (<= ~t4_pc~0 1) (<= ~t3_pc~0 1) (= ~t2_i~0 1) (= ~m_st~0 1) (<= ~token~0 2147483647) (= ~t5_i~0 1) (<= 0 ~t3_pc~0) (= ~t3_i~0 1) (<= ~t5_pc~0 1) (<= 0 ~t4_pc~0) (= ~t4_i~0 1) (<= 0 (+ ~token~0 2147483648)) (<= 0 ~t1_pc~0) (not (= ~token~0 (+ 5 ~local~0))))' at error location [2023-12-02 16:32:33,868 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:32:33,868 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:32:33,868 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 9, 12] total 36 [2023-12-02 16:32:33,868 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [761661089] [2023-12-02 16:32:33,868 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:32:33,869 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2023-12-02 16:32:33,869 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:32:33,870 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2023-12-02 16:32:33,871 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=805, Invalid=12535, Unknown=0, NotChecked=0, Total=13340 [2023-12-02 16:32:33,871 INFO L87 Difference]: Start difference. First operand 184069 states and 222425 transitions. Second operand has 36 states, 24 states have (on average 11.791666666666666) internal successors, (283), 27 states have internal predecessors, (283), 14 states have call successors, (41), 11 states have call predecessors, (41), 18 states have return successors, (40), 14 states have call predecessors, (40), 14 states have call successors, (40)