./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.06.cil-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 0e0057cc Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/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_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.06.cil-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/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_2a0d48da-59dc-487b-99ab-c321e7a8b936/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 0a12aada2256a7483e8803a0f1fb8477c858b141679e1395c89cdfba20292c4b --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-12-02 15:47:51,709 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-12-02 15:47:51,772 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-12-02 15:47:51,776 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-12-02 15:47:51,777 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-12-02 15:47:51,800 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-12-02 15:47:51,801 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-12-02 15:47:51,802 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-12-02 15:47:51,802 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-12-02 15:47:51,803 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-12-02 15:47:51,803 INFO L153 SettingsManager]: * User list type=DISABLED [2023-12-02 15:47:51,804 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-12-02 15:47:51,804 INFO L153 SettingsManager]: * Explicit value domain=true [2023-12-02 15:47:51,805 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-12-02 15:47:51,805 INFO L153 SettingsManager]: * Octagon Domain=false [2023-12-02 15:47:51,806 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-12-02 15:47:51,806 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-12-02 15:47:51,807 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-12-02 15:47:51,807 INFO L153 SettingsManager]: * Interval Domain=false [2023-12-02 15:47:51,808 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-12-02 15:47:51,808 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-12-02 15:47:51,809 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-12-02 15:47:51,809 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-12-02 15:47:51,810 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-12-02 15:47:51,810 INFO L153 SettingsManager]: * sizeof long=4 [2023-12-02 15:47:51,811 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-12-02 15:47:51,811 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-12-02 15:47:51,811 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-12-02 15:47:51,812 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-12-02 15:47:51,812 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-12-02 15:47:51,812 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-12-02 15:47:51,813 INFO L153 SettingsManager]: * sizeof long double=12 [2023-12-02 15:47:51,813 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-12-02 15:47:51,813 INFO L153 SettingsManager]: * Use constant arrays=true [2023-12-02 15:47:51,813 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-12-02 15:47:51,814 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-12-02 15:47:51,814 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-12-02 15:47:51,814 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 15:47:51,814 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-12-02 15:47:51,814 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-12-02 15:47:51,815 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-12-02 15:47:51,815 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-12-02 15:47:51,815 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-12-02 15:47:51,815 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-12-02 15:47:51,816 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-12-02 15:47:51,816 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-12-02 15:47:51,816 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-12-02 15:47:51,816 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_2a0d48da-59dc-487b-99ab-c321e7a8b936/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 0a12aada2256a7483e8803a0f1fb8477c858b141679e1395c89cdfba20292c4b [2023-12-02 15:47:52,043 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-12-02 15:47:52,065 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-12-02 15:47:52,067 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-12-02 15:47:52,069 INFO L270 PluginConnector]: Initializing CDTParser... [2023-12-02 15:47:52,069 INFO L274 PluginConnector]: CDTParser initialized [2023-12-02 15:47:52,070 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/../../sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.06.cil-1.c [2023-12-02 15:47:54,835 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-12-02 15:47:55,031 INFO L384 CDTParser]: Found 1 translation units. [2023-12-02 15:47:55,032 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.06.cil-1.c [2023-12-02 15:47:55,047 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/data/8f0fa2ec8/e6697d0e4507477bae7b2067b24329d2/FLAGbc9c24cc6 [2023-12-02 15:47:55,062 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/data/8f0fa2ec8/e6697d0e4507477bae7b2067b24329d2 [2023-12-02 15:47:55,064 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-12-02 15:47:55,065 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-12-02 15:47:55,067 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-12-02 15:47:55,067 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-12-02 15:47:55,072 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-12-02 15:47:55,073 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 03:47:55" (1/1) ... [2023-12-02 15:47:55,074 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@66d43ec and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:47:55, skipping insertion in model container [2023-12-02 15:47:55,074 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 03:47:55" (1/1) ... [2023-12-02 15:47:55,135 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-12-02 15:47:55,311 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_2a0d48da-59dc-487b-99ab-c321e7a8b936/sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.06.cil-1.c[911,924] [2023-12-02 15:47:55,369 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_2a0d48da-59dc-487b-99ab-c321e7a8b936/sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.06.cil-1.c[8416,8429] [2023-12-02 15:47:55,436 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 15:47:55,449 INFO L202 MainTranslator]: Completed pre-run [2023-12-02 15:47:55,458 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_2a0d48da-59dc-487b-99ab-c321e7a8b936/sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.06.cil-1.c[911,924] [2023-12-02 15:47:55,478 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_2a0d48da-59dc-487b-99ab-c321e7a8b936/sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.06.cil-1.c[8416,8429] [2023-12-02 15:47:55,512 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 15:47:55,532 INFO L206 MainTranslator]: Completed translation [2023-12-02 15:47:55,532 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:47:55 WrapperNode [2023-12-02 15:47:55,532 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-12-02 15:47:55,533 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-12-02 15:47:55,533 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-12-02 15:47:55,533 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-12-02 15:47:55,539 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:47:55" (1/1) ... [2023-12-02 15:47:55,552 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:47:55" (1/1) ... [2023-12-02 15:47:55,595 INFO L138 Inliner]: procedures = 67, calls = 80, calls flagged for inlining = 35, calls inlined = 35, statements flattened = 754 [2023-12-02 15:47:55,596 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-12-02 15:47:55,597 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-12-02 15:47:55,597 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-12-02 15:47:55,597 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-12-02 15:47:55,606 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:47:55" (1/1) ... [2023-12-02 15:47:55,606 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:47:55" (1/1) ... [2023-12-02 15:47:55,611 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:47:55" (1/1) ... [2023-12-02 15:47:55,611 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:47:55" (1/1) ... [2023-12-02 15:47:55,626 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:47:55" (1/1) ... [2023-12-02 15:47:55,636 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:47:55" (1/1) ... [2023-12-02 15:47:55,639 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:47:55" (1/1) ... [2023-12-02 15:47:55,643 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:47:55" (1/1) ... [2023-12-02 15:47:55,648 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-12-02 15:47:55,649 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-12-02 15:47:55,650 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-12-02 15:47:55,650 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-12-02 15:47:55,651 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:47:55" (1/1) ... [2023-12-02 15:47:55,657 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 15:47:55,671 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:47:55,684 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-12-02 15:47:55,696 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-12-02 15:47:55,727 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-12-02 15:47:55,728 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2023-12-02 15:47:55,728 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2023-12-02 15:47:55,728 INFO L130 BoogieDeclarations]: Found specification of procedure is_do_write_p_triggered [2023-12-02 15:47:55,728 INFO L138 BoogieDeclarations]: Found implementation of procedure is_do_write_p_triggered [2023-12-02 15:47:55,728 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread1 [2023-12-02 15:47:55,728 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread1 [2023-12-02 15:47:55,729 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread2 [2023-12-02 15:47:55,729 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread2 [2023-12-02 15:47:55,729 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events1 [2023-12-02 15:47:55,729 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events1 [2023-12-02 15:47:55,729 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events2 [2023-12-02 15:47:55,729 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events2 [2023-12-02 15:47:55,729 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads2 [2023-12-02 15:47:55,730 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads2 [2023-12-02 15:47:55,730 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads1 [2023-12-02 15:47:55,730 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads1 [2023-12-02 15:47:55,730 INFO L130 BoogieDeclarations]: Found specification of procedure is_do_read_c_triggered [2023-12-02 15:47:55,730 INFO L138 BoogieDeclarations]: Found implementation of procedure is_do_read_c_triggered [2023-12-02 15:47:55,730 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels1 [2023-12-02 15:47:55,730 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels1 [2023-12-02 15:47:55,731 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels2 [2023-12-02 15:47:55,731 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels2 [2023-12-02 15:47:55,731 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-12-02 15:47:55,731 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events2 [2023-12-02 15:47:55,731 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events2 [2023-12-02 15:47:55,731 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events1 [2023-12-02 15:47:55,732 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events1 [2023-12-02 15:47:55,732 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-12-02 15:47:55,732 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-12-02 15:47:55,732 INFO L130 BoogieDeclarations]: Found specification of procedure error1 [2023-12-02 15:47:55,732 INFO L138 BoogieDeclarations]: Found implementation of procedure error1 [2023-12-02 15:47:55,732 INFO L130 BoogieDeclarations]: Found specification of procedure error2 [2023-12-02 15:47:55,732 INFO L138 BoogieDeclarations]: Found implementation of procedure error2 [2023-12-02 15:47:55,854 INFO L241 CfgBuilder]: Building ICFG [2023-12-02 15:47:55,857 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-12-02 15:47:56,414 INFO L775 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##56: assume !(1 == ~q_free~0); [2023-12-02 15:47:56,414 INFO L775 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##55: assume 1 == ~q_free~0;~c_dr_st~0 := 2;~c_dr_pc~0 := 2;~a_t~0 := do_read_c_~a~0#1; [2023-12-02 15:47:56,487 INFO L282 CfgBuilder]: Performing block encoding [2023-12-02 15:47:56,871 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-12-02 15:47:56,871 INFO L309 CfgBuilder]: Removed 13 assume(true) statements. [2023-12-02 15:47:56,873 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 03:47:56 BoogieIcfgContainer [2023-12-02 15:47:56,873 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-12-02 15:47:56,876 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-12-02 15:47:56,876 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-12-02 15:47:56,879 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-12-02 15:47:56,880 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.12 03:47:55" (1/3) ... [2023-12-02 15:47:56,880 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@64a6ae34 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 03:47:56, skipping insertion in model container [2023-12-02 15:47:56,881 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:47:55" (2/3) ... [2023-12-02 15:47:56,881 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@64a6ae34 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 03:47:56, skipping insertion in model container [2023-12-02 15:47:56,881 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 03:47:56" (3/3) ... [2023-12-02 15:47:56,882 INFO L112 eAbstractionObserver]: Analyzing ICFG pc_sfifo_3.cil+token_ring.06.cil-1.c [2023-12-02 15:47:56,902 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-12-02 15:47:56,903 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2023-12-02 15:47:56,961 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-12-02 15:47:56,968 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;@c1ffc9, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-12-02 15:47:56,968 INFO L358 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2023-12-02 15:47:56,974 INFO L276 IsEmpty]: Start isEmpty. Operand has 214 states, 158 states have (on average 1.5063291139240507) internal successors, (238), 166 states have internal predecessors, (238), 38 states have call successors, (38), 15 states have call predecessors, (38), 15 states have return successors, (38), 36 states have call predecessors, (38), 38 states have call successors, (38) [2023-12-02 15:47:56,985 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2023-12-02 15:47:56,986 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:47:56,986 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 15:47:56,987 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:47:56,991 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:47:56,992 INFO L85 PathProgramCache]: Analyzing trace with hash 1695152563, now seen corresponding path program 1 times [2023-12-02 15:47:56,999 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:47:56,999 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [299794870] [2023-12-02 15:47:56,999 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:47:57,000 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:47:57,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:47:57,304 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 15:47:57,304 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:47:57,305 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [299794870] [2023-12-02 15:47:57,305 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [299794870] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:47:57,306 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 15:47:57,306 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-12-02 15:47:57,307 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1120545169] [2023-12-02 15:47:57,308 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:47:57,313 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 15:47:57,313 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:47:57,342 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 15:47:57,342 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 15:47:57,345 INFO L87 Difference]: Start difference. First operand has 214 states, 158 states have (on average 1.5063291139240507) internal successors, (238), 166 states have internal predecessors, (238), 38 states have call successors, (38), 15 states have call predecessors, (38), 15 states have return successors, (38), 36 states have call predecessors, (38), 38 states have call successors, (38) Second operand has 4 states, 4 states have (on average 7.25) internal successors, (29), 4 states have internal predecessors, (29), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 3 states have call predecessors, (7), 4 states have call successors, (7) [2023-12-02 15:47:57,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:47:57,753 INFO L93 Difference]: Finished difference Result 550 states and 806 transitions. [2023-12-02 15:47:57,754 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 15:47:57,756 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 7.25) internal successors, (29), 4 states have internal predecessors, (29), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 3 states have call predecessors, (7), 4 states have call successors, (7) Word has length 44 [2023-12-02 15:47:57,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:47:57,769 INFO L225 Difference]: With dead ends: 550 [2023-12-02 15:47:57,769 INFO L226 Difference]: Without dead ends: 337 [2023-12-02 15:47:57,774 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 15:47:57,778 INFO L413 NwaCegarLoop]: 309 mSDtfsCounter, 363 mSDsluCounter, 232 mSDsCounter, 0 mSdLazyCounter, 262 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 363 SdHoareTripleChecker+Valid, 541 SdHoareTripleChecker+Invalid, 284 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 262 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 15:47:57,779 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [363 Valid, 541 Invalid, 284 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 262 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 15:47:57,797 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 337 states. [2023-12-02 15:47:57,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 337 to 326. [2023-12-02 15:47:57,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 326 states, 239 states have (on average 1.4142259414225942) internal successors, (338), 244 states have internal predecessors, (338), 58 states have call successors, (58), 29 states have call predecessors, (58), 27 states have return successors, (57), 54 states have call predecessors, (57), 54 states have call successors, (57) [2023-12-02 15:47:57,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 326 states to 326 states and 453 transitions. [2023-12-02 15:47:57,853 INFO L78 Accepts]: Start accepts. Automaton has 326 states and 453 transitions. Word has length 44 [2023-12-02 15:47:57,854 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:47:57,854 INFO L495 AbstractCegarLoop]: Abstraction has 326 states and 453 transitions. [2023-12-02 15:47:57,854 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 7.25) internal successors, (29), 4 states have internal predecessors, (29), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 3 states have call predecessors, (7), 4 states have call successors, (7) [2023-12-02 15:47:57,854 INFO L276 IsEmpty]: Start isEmpty. Operand 326 states and 453 transitions. [2023-12-02 15:47:57,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2023-12-02 15:47:57,857 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:47:57,857 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 15:47:57,858 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-12-02 15:47:57,858 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:47:57,858 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:47:57,859 INFO L85 PathProgramCache]: Analyzing trace with hash -1455791776, now seen corresponding path program 1 times [2023-12-02 15:47:57,859 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:47:57,859 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1233878957] [2023-12-02 15:47:57,859 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:47:57,859 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:47:57,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:47:57,973 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 15:47:57,973 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:47:57,973 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1233878957] [2023-12-02 15:47:57,974 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1233878957] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:47:57,974 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 15:47:57,974 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-12-02 15:47:57,974 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [483291900] [2023-12-02 15:47:57,974 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:47:57,975 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 15:47:57,976 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:47:57,976 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 15:47:57,977 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 15:47:57,977 INFO L87 Difference]: Start difference. First operand 326 states and 453 transitions. Second operand has 6 states, 6 states have (on average 5.0) internal successors, (30), 6 states have internal predecessors, (30), 4 states have call successors, (8), 2 states have call predecessors, (8), 4 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2023-12-02 15:47:58,842 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:47:58,842 INFO L93 Difference]: Finished difference Result 863 states and 1176 transitions. [2023-12-02 15:47:58,843 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-12-02 15:47:58,843 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 5.0) internal successors, (30), 6 states have internal predecessors, (30), 4 states have call successors, (8), 2 states have call predecessors, (8), 4 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) Word has length 45 [2023-12-02 15:47:58,843 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:47:58,847 INFO L225 Difference]: With dead ends: 863 [2023-12-02 15:47:58,848 INFO L226 Difference]: Without dead ends: 397 [2023-12-02 15:47:58,851 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2023-12-02 15:47:58,853 INFO L413 NwaCegarLoop]: 357 mSDtfsCounter, 808 mSDsluCounter, 562 mSDsCounter, 0 mSdLazyCounter, 701 mSolverCounterSat, 256 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 816 SdHoareTripleChecker+Valid, 919 SdHoareTripleChecker+Invalid, 957 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 256 IncrementalHoareTripleChecker+Valid, 701 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-12-02 15:47:58,853 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [816 Valid, 919 Invalid, 957 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [256 Valid, 701 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-12-02 15:47:58,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 397 states. [2023-12-02 15:47:58,885 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 397 to 312. [2023-12-02 15:47:58,886 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 312 states, 225 states have (on average 1.3555555555555556) internal successors, (305), 230 states have internal predecessors, (305), 58 states have call successors, (58), 29 states have call predecessors, (58), 27 states have return successors, (54), 54 states have call predecessors, (54), 54 states have call successors, (54) [2023-12-02 15:47:58,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 312 states to 312 states and 417 transitions. [2023-12-02 15:47:58,889 INFO L78 Accepts]: Start accepts. Automaton has 312 states and 417 transitions. Word has length 45 [2023-12-02 15:47:58,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:47:58,889 INFO L495 AbstractCegarLoop]: Abstraction has 312 states and 417 transitions. [2023-12-02 15:47:58,889 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 5.0) internal successors, (30), 6 states have internal predecessors, (30), 4 states have call successors, (8), 2 states have call predecessors, (8), 4 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2023-12-02 15:47:58,890 INFO L276 IsEmpty]: Start isEmpty. Operand 312 states and 417 transitions. [2023-12-02 15:47:58,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2023-12-02 15:47:58,891 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:47:58,892 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 15:47:58,892 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-12-02 15:47:58,892 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:47:58,892 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:47:58,893 INFO L85 PathProgramCache]: Analyzing trace with hash 1178051182, now seen corresponding path program 1 times [2023-12-02 15:47:58,893 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:47:58,893 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [48387057] [2023-12-02 15:47:58,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:47:58,893 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:47:58,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:47:59,085 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 15:47:59,085 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:47:59,085 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [48387057] [2023-12-02 15:47:59,085 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [48387057] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:47:59,086 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 15:47:59,086 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2023-12-02 15:47:59,086 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [369270793] [2023-12-02 15:47:59,086 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:47:59,087 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-12-02 15:47:59,087 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:47:59,087 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-12-02 15:47:59,088 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2023-12-02 15:47:59,088 INFO L87 Difference]: Start difference. First operand 312 states and 417 transitions. Second operand has 8 states, 7 states have (on average 4.428571428571429) internal successors, (31), 7 states have internal predecessors, (31), 4 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 4 states have call predecessors, (7), 3 states have call successors, (7) [2023-12-02 15:47:59,835 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:47:59,836 INFO L93 Difference]: Finished difference Result 614 states and 785 transitions. [2023-12-02 15:47:59,836 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-12-02 15:47:59,836 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 4.428571428571429) internal successors, (31), 7 states have internal predecessors, (31), 4 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 4 states have call predecessors, (7), 3 states have call successors, (7) Word has length 46 [2023-12-02 15:47:59,837 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:47:59,840 INFO L225 Difference]: With dead ends: 614 [2023-12-02 15:47:59,841 INFO L226 Difference]: Without dead ends: 440 [2023-12-02 15:47:59,842 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=90, Invalid=216, Unknown=0, NotChecked=0, Total=306 [2023-12-02 15:47:59,843 INFO L413 NwaCegarLoop]: 169 mSDtfsCounter, 430 mSDsluCounter, 588 mSDsCounter, 0 mSdLazyCounter, 806 mSolverCounterSat, 97 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 457 SdHoareTripleChecker+Valid, 757 SdHoareTripleChecker+Invalid, 903 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 97 IncrementalHoareTripleChecker+Valid, 806 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-12-02 15:47:59,844 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [457 Valid, 757 Invalid, 903 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [97 Valid, 806 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-12-02 15:47:59,845 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 440 states. [2023-12-02 15:47:59,880 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 440 to 414. [2023-12-02 15:47:59,881 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 414 states, 293 states have (on average 1.3208191126279865) internal successors, (387), 298 states have internal predecessors, (387), 78 states have call successors, (78), 43 states have call predecessors, (78), 41 states have return successors, (74), 74 states have call predecessors, (74), 74 states have call successors, (74) [2023-12-02 15:47:59,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 414 states to 414 states and 539 transitions. [2023-12-02 15:47:59,885 INFO L78 Accepts]: Start accepts. Automaton has 414 states and 539 transitions. Word has length 46 [2023-12-02 15:47:59,886 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:47:59,886 INFO L495 AbstractCegarLoop]: Abstraction has 414 states and 539 transitions. [2023-12-02 15:47:59,886 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 4.428571428571429) internal successors, (31), 7 states have internal predecessors, (31), 4 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 4 states have call predecessors, (7), 3 states have call successors, (7) [2023-12-02 15:47:59,886 INFO L276 IsEmpty]: Start isEmpty. Operand 414 states and 539 transitions. [2023-12-02 15:47:59,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2023-12-02 15:47:59,888 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:47:59,888 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 15:47:59,888 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-12-02 15:47:59,889 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:47:59,889 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:47:59,889 INFO L85 PathProgramCache]: Analyzing trace with hash 38932531, now seen corresponding path program 1 times [2023-12-02 15:47:59,889 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:47:59,890 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [692467475] [2023-12-02 15:47:59,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:47:59,890 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:47:59,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:47:59,933 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 15:47:59,933 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:47:59,934 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [692467475] [2023-12-02 15:47:59,934 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [692467475] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:47:59,934 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 15:47:59,934 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 15:47:59,934 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1600568028] [2023-12-02 15:47:59,934 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:47:59,935 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 15:47:59,935 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:47:59,935 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 15:47:59,936 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 15:47:59,936 INFO L87 Difference]: Start difference. First operand 414 states and 539 transitions. Second operand has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-12-02 15:48:00,028 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:48:00,029 INFO L93 Difference]: Finished difference Result 679 states and 875 transitions. [2023-12-02 15:48:00,029 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 15:48:00,029 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 47 [2023-12-02 15:48:00,030 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:48:00,031 INFO L225 Difference]: With dead ends: 679 [2023-12-02 15:48:00,031 INFO L226 Difference]: Without dead ends: 133 [2023-12-02 15:48:00,033 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 15:48:00,034 INFO L413 NwaCegarLoop]: 232 mSDtfsCounter, 264 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 264 SdHoareTripleChecker+Valid, 232 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 15:48:00,035 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [264 Valid, 232 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 15:48:00,036 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2023-12-02 15:48:00,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 133. [2023-12-02 15:48:00,044 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 104 states have (on average 1.4615384615384615) internal successors, (152), 106 states have internal predecessors, (152), 22 states have call successors, (22), 7 states have call predecessors, (22), 6 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2023-12-02 15:48:00,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 194 transitions. [2023-12-02 15:48:00,046 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 194 transitions. Word has length 47 [2023-12-02 15:48:00,046 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:48:00,046 INFO L495 AbstractCegarLoop]: Abstraction has 133 states and 194 transitions. [2023-12-02 15:48:00,047 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-12-02 15:48:00,047 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 194 transitions. [2023-12-02 15:48:00,048 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2023-12-02 15:48:00,048 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:48:00,048 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 15:48:00,048 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-12-02 15:48:00,048 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:48:00,049 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:48:00,049 INFO L85 PathProgramCache]: Analyzing trace with hash -2094108103, now seen corresponding path program 1 times [2023-12-02 15:48:00,049 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:48:00,049 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [199113695] [2023-12-02 15:48:00,049 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:48:00,050 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:48:00,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:48:00,147 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 15:48:00,147 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:48:00,148 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [199113695] [2023-12-02 15:48:00,148 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [199113695] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:48:00,148 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 15:48:00,148 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-12-02 15:48:00,148 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1808830549] [2023-12-02 15:48:00,148 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:48:00,149 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 15:48:00,149 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:48:00,150 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 15:48:00,150 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-12-02 15:48:00,150 INFO L87 Difference]: Start difference. First operand 133 states and 194 transitions. Second operand has 5 states, 5 states have (on average 7.8) internal successors, (39), 5 states have internal predecessors, (39), 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 15:48:00,713 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:48:00,713 INFO L93 Difference]: Finished difference Result 726 states and 1122 transitions. [2023-12-02 15:48:00,714 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-12-02 15:48:00,714 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 7.8) internal successors, (39), 5 states have internal predecessors, (39), 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 50 [2023-12-02 15:48:00,714 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:48:00,719 INFO L225 Difference]: With dead ends: 726 [2023-12-02 15:48:00,719 INFO L226 Difference]: Without dead ends: 599 [2023-12-02 15:48:00,720 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2023-12-02 15:48:00,721 INFO L413 NwaCegarLoop]: 294 mSDtfsCounter, 808 mSDsluCounter, 504 mSDsCounter, 0 mSdLazyCounter, 363 mSolverCounterSat, 148 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 810 SdHoareTripleChecker+Valid, 798 SdHoareTripleChecker+Invalid, 511 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 148 IncrementalHoareTripleChecker+Valid, 363 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-12-02 15:48:00,722 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [810 Valid, 798 Invalid, 511 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [148 Valid, 363 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-12-02 15:48:00,723 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 599 states. [2023-12-02 15:48:00,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 599 to 586. [2023-12-02 15:48:00,761 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 586 states, 472 states have (on average 1.4491525423728813) internal successors, (684), 477 states have internal predecessors, (684), 83 states have call successors, (83), 31 states have call predecessors, (83), 30 states have return successors, (119), 78 states have call predecessors, (119), 81 states have call successors, (119) [2023-12-02 15:48:00,766 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 586 states to 586 states and 886 transitions. [2023-12-02 15:48:00,766 INFO L78 Accepts]: Start accepts. Automaton has 586 states and 886 transitions. Word has length 50 [2023-12-02 15:48:00,767 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:48:00,767 INFO L495 AbstractCegarLoop]: Abstraction has 586 states and 886 transitions. [2023-12-02 15:48:00,767 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 7.8) internal successors, (39), 5 states have internal predecessors, (39), 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 15:48:00,767 INFO L276 IsEmpty]: Start isEmpty. Operand 586 states and 886 transitions. [2023-12-02 15:48:00,770 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2023-12-02 15:48:00,770 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:48:00,771 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 15:48:00,771 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-12-02 15:48:00,771 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:48:00,772 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:48:00,772 INFO L85 PathProgramCache]: Analyzing trace with hash 2052014861, now seen corresponding path program 1 times [2023-12-02 15:48:00,772 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:48:00,772 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [197191751] [2023-12-02 15:48:00,772 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:48:00,773 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:48:00,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:48:00,894 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-12-02 15:48:00,894 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:48:00,894 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [197191751] [2023-12-02 15:48:00,895 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [197191751] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:48:00,895 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2139494624] [2023-12-02 15:48:00,895 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:48:00,895 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:48:00,895 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:48:00,899 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:48:00,907 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-12-02 15:48:01,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:48:01,104 INFO L262 TraceCheckSpWp]: Trace formula consists of 640 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 15:48:01,113 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:48:01,170 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-12-02 15:48:01,171 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 15:48:01,171 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2139494624] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:48:01,171 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 15:48:01,172 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-12-02 15:48:01,172 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1069982671] [2023-12-02 15:48:01,172 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:48:01,173 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 15:48:01,173 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:48:01,174 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 15:48:01,174 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 15:48:01,174 INFO L87 Difference]: Start difference. First operand 586 states and 886 transitions. Second operand has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 2 states have internal predecessors, (62), 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 15:48:01,350 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:48:01,350 INFO L93 Difference]: Finished difference Result 1730 states and 2686 transitions. [2023-12-02 15:48:01,351 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 15:48:01,351 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 2 states have internal predecessors, (62), 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 96 [2023-12-02 15:48:01,351 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:48:01,358 INFO L225 Difference]: With dead ends: 1730 [2023-12-02 15:48:01,358 INFO L226 Difference]: Without dead ends: 1150 [2023-12-02 15:48:01,361 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 96 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 15:48:01,362 INFO L413 NwaCegarLoop]: 159 mSDtfsCounter, 166 mSDsluCounter, 150 mSDsCounter, 0 mSdLazyCounter, 67 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 166 SdHoareTripleChecker+Valid, 309 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 67 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 15:48:01,362 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [166 Valid, 309 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 67 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 15:48:01,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1150 states. [2023-12-02 15:48:01,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1150 to 1141. [2023-12-02 15:48:01,422 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1141 states, 925 states have (on average 1.442162162162162) internal successors, (1334), 933 states have internal predecessors, (1334), 155 states have call successors, (155), 61 states have call predecessors, (155), 60 states have return successors, (225), 147 states have call predecessors, (225), 153 states have call successors, (225) [2023-12-02 15:48:01,429 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1141 states to 1141 states and 1714 transitions. [2023-12-02 15:48:01,429 INFO L78 Accepts]: Start accepts. Automaton has 1141 states and 1714 transitions. Word has length 96 [2023-12-02 15:48:01,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:48:01,429 INFO L495 AbstractCegarLoop]: Abstraction has 1141 states and 1714 transitions. [2023-12-02 15:48:01,430 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 2 states have internal predecessors, (62), 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 15:48:01,430 INFO L276 IsEmpty]: Start isEmpty. Operand 1141 states and 1714 transitions. [2023-12-02 15:48:01,432 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2023-12-02 15:48:01,432 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:48:01,432 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 15:48:01,439 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-12-02 15:48:01,633 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:48:01,633 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:48:01,633 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:48:01,634 INFO L85 PathProgramCache]: Analyzing trace with hash -1038574611, now seen corresponding path program 1 times [2023-12-02 15:48:01,634 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:48:01,634 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1452610253] [2023-12-02 15:48:01,634 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:48:01,634 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:48:01,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:48:01,750 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-12-02 15:48:01,750 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:48:01,750 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1452610253] [2023-12-02 15:48:01,750 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1452610253] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:48:01,750 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [113480076] [2023-12-02 15:48:01,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:48:01,750 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:48:01,751 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:48:01,751 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:48:01,756 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-12-02 15:48:01,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:48:01,917 INFO L262 TraceCheckSpWp]: Trace formula consists of 634 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 15:48:01,921 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:48:01,983 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 20 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-12-02 15:48:01,983 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 15:48:01,984 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [113480076] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:48:01,984 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 15:48:01,984 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-12-02 15:48:01,984 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [344773337] [2023-12-02 15:48:01,984 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:48:01,985 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 15:48:01,985 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:48:01,986 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 15:48:01,986 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 15:48:01,986 INFO L87 Difference]: Start difference. First operand 1141 states and 1714 transitions. Second operand has 3 states, 3 states have (on average 23.666666666666668) internal successors, (71), 2 states have internal predecessors, (71), 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 15:48:02,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:48:02,171 INFO L93 Difference]: Finished difference Result 3380 states and 5208 transitions. [2023-12-02 15:48:02,172 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 15:48:02,172 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 23.666666666666668) internal successors, (71), 2 states have internal predecessors, (71), 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 96 [2023-12-02 15:48:02,172 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:48:02,184 INFO L225 Difference]: With dead ends: 3380 [2023-12-02 15:48:02,184 INFO L226 Difference]: Without dead ends: 2245 [2023-12-02 15:48:02,189 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 96 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 15:48:02,189 INFO L413 NwaCegarLoop]: 159 mSDtfsCounter, 157 mSDsluCounter, 150 mSDsCounter, 0 mSdLazyCounter, 67 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 157 SdHoareTripleChecker+Valid, 309 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 67 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 15:48:02,190 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [157 Valid, 309 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 67 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 15:48:02,192 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2245 states. [2023-12-02 15:48:02,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2245 to 2231. [2023-12-02 15:48:02,319 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2231 states, 1816 states have (on average 1.433920704845815) internal successors, (2604), 1830 states have internal predecessors, (2604), 294 states have call successors, (294), 121 states have call predecessors, (294), 120 states have return successors, (428), 280 states have call predecessors, (428), 292 states have call successors, (428) [2023-12-02 15:48:02,334 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2231 states to 2231 states and 3326 transitions. [2023-12-02 15:48:02,335 INFO L78 Accepts]: Start accepts. Automaton has 2231 states and 3326 transitions. Word has length 96 [2023-12-02 15:48:02,335 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:48:02,335 INFO L495 AbstractCegarLoop]: Abstraction has 2231 states and 3326 transitions. [2023-12-02 15:48:02,335 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 23.666666666666668) internal successors, (71), 2 states have internal predecessors, (71), 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 15:48:02,336 INFO L276 IsEmpty]: Start isEmpty. Operand 2231 states and 3326 transitions. [2023-12-02 15:48:02,340 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2023-12-02 15:48:02,340 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:48:02,341 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 15:48:02,347 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-12-02 15:48:02,543 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:48:02,543 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:48:02,544 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:48:02,544 INFO L85 PathProgramCache]: Analyzing trace with hash 790480653, now seen corresponding path program 1 times [2023-12-02 15:48:02,544 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:48:02,544 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2126606266] [2023-12-02 15:48:02,544 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:48:02,544 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:48:02,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:48:02,655 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-12-02 15:48:02,656 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:48:02,656 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2126606266] [2023-12-02 15:48:02,656 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2126606266] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:48:02,656 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1168873968] [2023-12-02 15:48:02,656 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:48:02,657 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:48:02,657 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:48:02,659 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:48:02,662 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-12-02 15:48:02,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:48:02,827 INFO L262 TraceCheckSpWp]: Trace formula consists of 628 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 15:48:02,832 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:48:02,873 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-12-02 15:48:02,874 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 15:48:02,874 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1168873968] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:48:02,874 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 15:48:02,874 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-12-02 15:48:02,875 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2011952618] [2023-12-02 15:48:02,875 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:48:02,875 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 15:48:02,875 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:48:02,876 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 15:48:02,876 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 15:48:02,876 INFO L87 Difference]: Start difference. First operand 2231 states and 3326 transitions. Second operand has 3 states, 3 states have (on average 21.666666666666668) internal successors, (65), 2 states have internal predecessors, (65), 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 15:48:03,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:48:03,232 INFO L93 Difference]: Finished difference Result 6620 states and 10111 transitions. [2023-12-02 15:48:03,232 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 15:48:03,232 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.666666666666668) internal successors, (65), 2 states have internal predecessors, (65), 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 96 [2023-12-02 15:48:03,233 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:48:03,265 INFO L225 Difference]: With dead ends: 6620 [2023-12-02 15:48:03,266 INFO L226 Difference]: Without dead ends: 4395 [2023-12-02 15:48:03,277 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 96 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 15:48:03,278 INFO L413 NwaCegarLoop]: 159 mSDtfsCounter, 163 mSDsluCounter, 150 mSDsCounter, 0 mSdLazyCounter, 67 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 163 SdHoareTripleChecker+Valid, 309 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 67 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 15:48:03,278 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [163 Valid, 309 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 67 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 15:48:03,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4395 states. [2023-12-02 15:48:03,586 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4395 to 4371. [2023-12-02 15:48:03,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4371 states, 3568 states have (on average 1.4248878923766817) internal successors, (5084), 3594 states have internal predecessors, (5084), 562 states have call successors, (562), 241 states have call predecessors, (562), 240 states have return successors, (816), 536 states have call predecessors, (816), 560 states have call successors, (816) [2023-12-02 15:48:03,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4371 states to 4371 states and 6462 transitions. [2023-12-02 15:48:03,617 INFO L78 Accepts]: Start accepts. Automaton has 4371 states and 6462 transitions. Word has length 96 [2023-12-02 15:48:03,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:48:03,618 INFO L495 AbstractCegarLoop]: Abstraction has 4371 states and 6462 transitions. [2023-12-02 15:48:03,618 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.666666666666668) internal successors, (65), 2 states have internal predecessors, (65), 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 15:48:03,618 INFO L276 IsEmpty]: Start isEmpty. Operand 4371 states and 6462 transitions. [2023-12-02 15:48:03,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2023-12-02 15:48:03,625 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:48:03,625 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 15:48:03,632 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-12-02 15:48:03,826 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:48:03,826 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:48:03,826 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:48:03,826 INFO L85 PathProgramCache]: Analyzing trace with hash 1293818413, now seen corresponding path program 1 times [2023-12-02 15:48:03,827 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:48:03,827 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [635214120] [2023-12-02 15:48:03,827 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:48:03,827 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:48:03,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:48:03,973 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-12-02 15:48:03,974 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:48:03,974 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [635214120] [2023-12-02 15:48:03,974 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [635214120] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:48:03,974 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 15:48:03,974 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 15:48:03,975 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [9202123] [2023-12-02 15:48:03,975 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:48:03,975 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 15:48:03,975 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:48:03,976 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 15:48:03,976 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 15:48:03,976 INFO L87 Difference]: Start difference. First operand 4371 states and 6462 transitions. Second operand has 3 states, 3 states have (on average 18.666666666666668) internal successors, (56), 3 states have internal predecessors, (56), 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 15:48:04,385 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:48:04,386 INFO L93 Difference]: Finished difference Result 8919 states and 13453 transitions. [2023-12-02 15:48:04,386 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 15:48:04,386 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.666666666666668) internal successors, (56), 3 states have internal predecessors, (56), 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 96 [2023-12-02 15:48:04,387 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:48:04,427 INFO L225 Difference]: With dead ends: 8919 [2023-12-02 15:48:04,427 INFO L226 Difference]: Without dead ends: 5411 [2023-12-02 15:48:04,441 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 15:48:04,441 INFO L413 NwaCegarLoop]: 243 mSDtfsCounter, 80 mSDsluCounter, 165 mSDsCounter, 0 mSdLazyCounter, 82 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 80 SdHoareTripleChecker+Valid, 408 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 82 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 15:48:04,442 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [80 Valid, 408 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 82 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 15:48:04,449 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5411 states. [2023-12-02 15:48:04,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5411 to 5043. [2023-12-02 15:48:04,815 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5043 states, 4208 states have (on average 1.4496197718631179) internal successors, (6100), 4234 states have internal predecessors, (6100), 578 states have call successors, (578), 257 states have call predecessors, (578), 256 states have return successors, (832), 552 states have call predecessors, (832), 576 states have call successors, (832) [2023-12-02 15:48:04,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5043 states to 5043 states and 7510 transitions. [2023-12-02 15:48:04,835 INFO L78 Accepts]: Start accepts. Automaton has 5043 states and 7510 transitions. Word has length 96 [2023-12-02 15:48:04,835 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:48:04,835 INFO L495 AbstractCegarLoop]: Abstraction has 5043 states and 7510 transitions. [2023-12-02 15:48:04,835 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.666666666666668) internal successors, (56), 3 states have internal predecessors, (56), 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 15:48:04,836 INFO L276 IsEmpty]: Start isEmpty. Operand 5043 states and 7510 transitions. [2023-12-02 15:48:04,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2023-12-02 15:48:04,851 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:48:04,851 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 15:48:04,851 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-12-02 15:48:04,852 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:48:04,852 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:48:04,852 INFO L85 PathProgramCache]: Analyzing trace with hash 1940485234, now seen corresponding path program 1 times [2023-12-02 15:48:04,852 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:48:04,852 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2011305464] [2023-12-02 15:48:04,852 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:48:04,852 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:48:04,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:48:04,939 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2023-12-02 15:48:04,939 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:48:04,939 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2011305464] [2023-12-02 15:48:04,939 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2011305464] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:48:04,939 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 15:48:04,940 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 15:48:04,940 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2094554295] [2023-12-02 15:48:04,940 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:48:04,940 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 15:48:04,940 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:48:04,941 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 15:48:04,941 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 15:48:04,941 INFO L87 Difference]: Start difference. First operand 5043 states and 7510 transitions. Second operand has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 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 15:48:05,618 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:48:05,618 INFO L93 Difference]: Finished difference Result 14940 states and 22667 transitions. [2023-12-02 15:48:05,618 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 15:48:05,619 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 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 129 [2023-12-02 15:48:05,619 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:48:05,691 INFO L225 Difference]: With dead ends: 14940 [2023-12-02 15:48:05,691 INFO L226 Difference]: Without dead ends: 9903 [2023-12-02 15:48:05,711 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 15:48:05,712 INFO L413 NwaCegarLoop]: 161 mSDtfsCounter, 158 mSDsluCounter, 150 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 158 SdHoareTripleChecker+Valid, 311 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 15:48:05,712 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [158 Valid, 311 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 65 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 15:48:05,726 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9903 states. [2023-12-02 15:48:06,406 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9903 to 9843. [2023-12-02 15:48:06,420 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9843 states, 8220 states have (on average 1.4369829683698296) internal successors, (11812), 8270 states have internal predecessors, (11812), 1110 states have call successors, (1110), 513 states have call predecessors, (1110), 512 states have return successors, (1588), 1060 states have call predecessors, (1588), 1108 states have call successors, (1588) [2023-12-02 15:48:06,448 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9843 states to 9843 states and 14510 transitions. [2023-12-02 15:48:06,449 INFO L78 Accepts]: Start accepts. Automaton has 9843 states and 14510 transitions. Word has length 129 [2023-12-02 15:48:06,450 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:48:06,450 INFO L495 AbstractCegarLoop]: Abstraction has 9843 states and 14510 transitions. [2023-12-02 15:48:06,450 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 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 15:48:06,450 INFO L276 IsEmpty]: Start isEmpty. Operand 9843 states and 14510 transitions. [2023-12-02 15:48:06,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2023-12-02 15:48:06,471 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:48:06,471 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 15:48:06,472 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2023-12-02 15:48:06,472 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:48:06,472 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:48:06,472 INFO L85 PathProgramCache]: Analyzing trace with hash -906940679, now seen corresponding path program 1 times [2023-12-02 15:48:06,473 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:48:06,473 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [178559734] [2023-12-02 15:48:06,473 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:48:06,473 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:48:06,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:48:06,535 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2023-12-02 15:48:06,535 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:48:06,535 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [178559734] [2023-12-02 15:48:06,535 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [178559734] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:48:06,535 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 15:48:06,536 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 15:48:06,536 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [916171950] [2023-12-02 15:48:06,536 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:48:06,536 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 15:48:06,536 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:48:06,537 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 15:48:06,537 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 15:48:06,537 INFO L87 Difference]: Start difference. First operand 9843 states and 14510 transitions. Second operand has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 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 15:48:07,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:48:07,667 INFO L93 Difference]: Finished difference Result 29164 states and 43751 transitions. [2023-12-02 15:48:07,667 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 15:48:07,668 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 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 129 [2023-12-02 15:48:07,668 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:48:07,749 INFO L225 Difference]: With dead ends: 29164 [2023-12-02 15:48:07,749 INFO L226 Difference]: Without dead ends: 19327 [2023-12-02 15:48:07,789 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 15:48:07,790 INFO L413 NwaCegarLoop]: 165 mSDtfsCounter, 161 mSDsluCounter, 150 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 161 SdHoareTripleChecker+Valid, 315 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 15:48:07,790 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [161 Valid, 315 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 65 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 15:48:07,812 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19327 states. [2023-12-02 15:48:08,777 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19327 to 19211. [2023-12-02 15:48:08,794 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19211 states, 16052 states have (on average 1.423623224520309) internal successors, (22852), 16150 states have internal predecessors, (22852), 2134 states have call successors, (2134), 1025 states have call predecessors, (2134), 1024 states have return successors, (3028), 2036 states have call predecessors, (3028), 2132 states have call successors, (3028) [2023-12-02 15:48:08,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19211 states to 19211 states and 28014 transitions. [2023-12-02 15:48:08,850 INFO L78 Accepts]: Start accepts. Automaton has 19211 states and 28014 transitions. Word has length 129 [2023-12-02 15:48:08,851 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:48:08,851 INFO L495 AbstractCegarLoop]: Abstraction has 19211 states and 28014 transitions. [2023-12-02 15:48:08,851 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 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 15:48:08,851 INFO L276 IsEmpty]: Start isEmpty. Operand 19211 states and 28014 transitions. [2023-12-02 15:48:08,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2023-12-02 15:48:08,906 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:48:08,907 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 15:48:08,907 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2023-12-02 15:48:08,907 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:48:08,907 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:48:08,907 INFO L85 PathProgramCache]: Analyzing trace with hash 514040696, now seen corresponding path program 1 times [2023-12-02 15:48:08,908 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:48:08,908 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1030288866] [2023-12-02 15:48:08,908 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:48:08,908 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:48:08,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:48:09,233 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 10 proven. 41 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2023-12-02 15:48:09,233 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:48:09,233 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1030288866] [2023-12-02 15:48:09,233 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1030288866] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:48:09,233 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [259322309] [2023-12-02 15:48:09,234 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:48:09,234 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:48:09,234 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:48:09,235 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:48:09,237 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-12-02 15:48:09,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:48:09,428 INFO L262 TraceCheckSpWp]: Trace formula consists of 836 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 15:48:09,431 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:48:09,469 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 71 proven. 0 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2023-12-02 15:48:09,469 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 15:48:09,469 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [259322309] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:48:09,469 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 15:48:09,469 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-12-02 15:48:09,470 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1811127234] [2023-12-02 15:48:09,470 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:48:09,470 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 15:48:09,470 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:48:09,471 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 15:48:09,471 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 15:48:09,471 INFO L87 Difference]: Start difference. First operand 19211 states and 28014 transitions. Second operand has 3 states, 3 states have (on average 35.0) internal successors, (105), 3 states have internal predecessors, (105), 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 15:48:10,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:48:10,572 INFO L93 Difference]: Finished difference Result 35208 states and 51381 transitions. [2023-12-02 15:48:10,573 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 15:48:10,573 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 35.0) internal successors, (105), 3 states have internal predecessors, (105), 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 150 [2023-12-02 15:48:10,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:48:10,644 INFO L225 Difference]: With dead ends: 35208 [2023-12-02 15:48:10,645 INFO L226 Difference]: Without dead ends: 23892 [2023-12-02 15:48:10,684 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 152 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 15:48:10,685 INFO L413 NwaCegarLoop]: 182 mSDtfsCounter, 167 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 167 SdHoareTripleChecker+Valid, 221 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 15:48:10,685 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [167 Valid, 221 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 15:48:10,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23892 states. [2023-12-02 15:48:11,661 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23892 to 23892. [2023-12-02 15:48:11,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23892 states, 20258 states have (on average 1.3877974133675586) internal successors, (28114), 20356 states have internal predecessors, (28114), 2291 states have call successors, (2291), 1342 states have call predecessors, (2291), 1342 states have return successors, (3311), 2194 states have call predecessors, (3311), 2289 states have call successors, (3311) [2023-12-02 15:48:11,790 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23892 states to 23892 states and 33716 transitions. [2023-12-02 15:48:11,791 INFO L78 Accepts]: Start accepts. Automaton has 23892 states and 33716 transitions. Word has length 150 [2023-12-02 15:48:11,791 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:48:11,792 INFO L495 AbstractCegarLoop]: Abstraction has 23892 states and 33716 transitions. [2023-12-02 15:48:11,792 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 35.0) internal successors, (105), 3 states have internal predecessors, (105), 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 15:48:11,792 INFO L276 IsEmpty]: Start isEmpty. Operand 23892 states and 33716 transitions. [2023-12-02 15:48:11,827 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2023-12-02 15:48:11,828 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:48:11,828 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 15:48:11,834 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-12-02 15:48:12,028 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2023-12-02 15:48:12,029 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:48:12,029 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:48:12,029 INFO L85 PathProgramCache]: Analyzing trace with hash 1639300665, now seen corresponding path program 2 times [2023-12-02 15:48:12,029 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:48:12,029 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [376077497] [2023-12-02 15:48:12,029 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:48:12,030 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:48:12,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:48:12,330 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 10 proven. 42 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2023-12-02 15:48:12,330 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:48:12,331 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [376077497] [2023-12-02 15:48:12,331 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [376077497] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:48:12,331 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [94967659] [2023-12-02 15:48:12,331 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 15:48:12,331 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:48:12,331 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:48:12,332 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:48:12,335 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-12-02 15:48:12,500 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-12-02 15:48:12,501 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 15:48:12,503 INFO L262 TraceCheckSpWp]: Trace formula consists of 551 conjuncts, 5 conjunts are in the unsatisfiable core [2023-12-02 15:48:12,508 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:48:12,579 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 87 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-12-02 15:48:12,579 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 15:48:12,580 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [94967659] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:48:12,580 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 15:48:12,580 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 8 [2023-12-02 15:48:12,580 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1635494416] [2023-12-02 15:48:12,580 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:48:12,581 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 15:48:12,581 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:48:12,581 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 15:48:12,581 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2023-12-02 15:48:12,582 INFO L87 Difference]: Start difference. First operand 23892 states and 33716 transitions. Second operand has 4 states, 4 states have (on average 29.75) internal successors, (119), 4 states have internal predecessors, (119), 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 15:48:14,566 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:48:14,566 INFO L93 Difference]: Finished difference Result 70822 states and 99901 transitions. [2023-12-02 15:48:14,567 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-12-02 15:48:14,567 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 29.75) internal successors, (119), 4 states have internal predecessors, (119), 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 150 [2023-12-02 15:48:14,567 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:48:14,716 INFO L225 Difference]: With dead ends: 70822 [2023-12-02 15:48:14,716 INFO L226 Difference]: Without dead ends: 46937 [2023-12-02 15:48:14,755 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 151 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 15:48:14,756 INFO L413 NwaCegarLoop]: 305 mSDtfsCounter, 153 mSDsluCounter, 458 mSDsCounter, 0 mSdLazyCounter, 151 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 153 SdHoareTripleChecker+Valid, 763 SdHoareTripleChecker+Invalid, 154 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 151 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 15:48:14,756 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [153 Valid, 763 Invalid, 154 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 151 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 15:48:14,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46937 states. [2023-12-02 15:48:17,350 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46937 to 46805. [2023-12-02 15:48:17,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46805 states, 39613 states have (on average 1.376442077095903) internal successors, (54525), 39807 states have internal predecessors, (54525), 4510 states have call successors, (4510), 2681 states have call predecessors, (4510), 2681 states have return successors, (6806), 4317 states have call predecessors, (6806), 4508 states have call successors, (6806) [2023-12-02 15:48:17,518 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46805 states to 46805 states and 65841 transitions. [2023-12-02 15:48:17,520 INFO L78 Accepts]: Start accepts. Automaton has 46805 states and 65841 transitions. Word has length 150 [2023-12-02 15:48:17,520 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:48:17,520 INFO L495 AbstractCegarLoop]: Abstraction has 46805 states and 65841 transitions. [2023-12-02 15:48:17,521 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 29.75) internal successors, (119), 4 states have internal predecessors, (119), 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 15:48:17,521 INFO L276 IsEmpty]: Start isEmpty. Operand 46805 states and 65841 transitions. [2023-12-02 15:48:17,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2023-12-02 15:48:17,603 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:48:17,603 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 15:48:17,610 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-12-02 15:48:17,804 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2023-12-02 15:48:17,804 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:48:17,805 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:48:17,805 INFO L85 PathProgramCache]: Analyzing trace with hash 1718418520, now seen corresponding path program 1 times [2023-12-02 15:48:17,805 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:48:17,805 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [998547832] [2023-12-02 15:48:17,805 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:48:17,805 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:48:17,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:48:18,077 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 10 proven. 43 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2023-12-02 15:48:18,077 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:48:18,077 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [998547832] [2023-12-02 15:48:18,077 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [998547832] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:48:18,077 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1520710894] [2023-12-02 15:48:18,078 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:48:18,078 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:48:18,078 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:48:18,079 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:48:18,082 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-12-02 15:48:18,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:48:18,283 INFO L262 TraceCheckSpWp]: Trace formula consists of 830 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 15:48:18,287 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:48:18,338 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 81 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-12-02 15:48:18,339 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 15:48:18,339 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1520710894] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:48:18,339 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 15:48:18,339 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-12-02 15:48:18,339 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1177754294] [2023-12-02 15:48:18,339 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:48:18,340 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 15:48:18,340 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:48:18,341 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 15:48:18,341 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 15:48:18,341 INFO L87 Difference]: Start difference. First operand 46805 states and 65841 transitions. Second operand has 3 states, 3 states have (on average 36.333333333333336) internal successors, (109), 3 states have internal predecessors, (109), 3 states have call successors, (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 15:48:20,800 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:48:20,800 INFO L93 Difference]: Finished difference Result 94373 states and 136111 transitions. [2023-12-02 15:48:20,800 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 15:48:20,800 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 36.333333333333336) internal successors, (109), 3 states have internal predecessors, (109), 3 states have call successors, (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 150 [2023-12-02 15:48:20,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:48:20,979 INFO L225 Difference]: With dead ends: 94373 [2023-12-02 15:48:20,979 INFO L226 Difference]: Without dead ends: 66667 [2023-12-02 15:48:21,035 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 152 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 15:48:21,035 INFO L413 NwaCegarLoop]: 291 mSDtfsCounter, 161 mSDsluCounter, 153 mSDsCounter, 0 mSdLazyCounter, 92 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 161 SdHoareTripleChecker+Valid, 444 SdHoareTripleChecker+Invalid, 96 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 92 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 15:48:21,035 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [161 Valid, 444 Invalid, 96 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 92 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 15:48:21,081 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66667 states. [2023-12-02 15:48:24,574 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66667 to 65831. [2023-12-02 15:48:24,602 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65831 states, 55768 states have (on average 1.3735475541529192) internal successors, (76600), 56026 states have internal predecessors, (76600), 6298 states have call successors, (6298), 3765 states have call predecessors, (6298), 3764 states have return successors, (10665), 6040 states have call predecessors, (10665), 6296 states have call successors, (10665) [2023-12-02 15:48:24,772 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65831 states to 65831 states and 93563 transitions. [2023-12-02 15:48:24,774 INFO L78 Accepts]: Start accepts. Automaton has 65831 states and 93563 transitions. Word has length 150 [2023-12-02 15:48:24,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:48:24,775 INFO L495 AbstractCegarLoop]: Abstraction has 65831 states and 93563 transitions. [2023-12-02 15:48:24,775 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 36.333333333333336) internal successors, (109), 3 states have internal predecessors, (109), 3 states have call successors, (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 15:48:24,775 INFO L276 IsEmpty]: Start isEmpty. Operand 65831 states and 93563 transitions. [2023-12-02 15:48:24,838 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2023-12-02 15:48:24,838 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:48:24,839 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, 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 15:48:24,843 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-12-02 15:48:25,039 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2023-12-02 15:48:25,039 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:48:25,040 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:48:25,040 INFO L85 PathProgramCache]: Analyzing trace with hash -1933029647, now seen corresponding path program 1 times [2023-12-02 15:48:25,040 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:48:25,040 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1308741374] [2023-12-02 15:48:25,040 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:48:25,040 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:48:25,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:48:25,399 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 12 proven. 44 refuted. 0 times theorem prover too weak. 53 trivial. 0 not checked. [2023-12-02 15:48:25,399 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:48:25,400 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1308741374] [2023-12-02 15:48:25,400 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1308741374] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:48:25,400 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1082669372] [2023-12-02 15:48:25,400 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:48:25,400 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:48:25,400 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:48:25,401 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:48:25,404 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-12-02 15:48:25,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:48:25,625 INFO L262 TraceCheckSpWp]: Trace formula consists of 927 conjuncts, 24 conjunts are in the unsatisfiable core [2023-12-02 15:48:25,630 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:48:25,824 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 70 proven. 17 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2023-12-02 15:48:25,825 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 15:48:26,204 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 13 proven. 44 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2023-12-02 15:48:26,204 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1082669372] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 15:48:26,204 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [84085733] [2023-12-02 15:48:26,230 INFO L159 IcfgInterpreter]: Started Sifa with 79 locations of interest [2023-12-02 15:48:26,230 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 15:48:26,234 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 15:48:26,239 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 15:48:26,240 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 15:48:54,000 INFO L197 IcfgInterpreter]: Interpreting procedure error2 with input of size 12 for LOIs [2023-12-02 15:48:54,001 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events2 with input of size 176 for LOIs [2023-12-02 15:48:54,133 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread2 with input of size 1 for LOIs [2023-12-02 15:48:54,151 INFO L197 IcfgInterpreter]: Interpreting procedure update_channels2 with input of size 1 for LOIs [2023-12-02 15:48:54,152 INFO L197 IcfgInterpreter]: Interpreting procedure immediate_notify with input of size 52 for LOIs [2023-12-02 15:48:54,229 INFO L197 IcfgInterpreter]: Interpreting procedure activate_threads2 with input of size 1 for LOIs [2023-12-02 15:48:54,378 INFO L197 IcfgInterpreter]: Interpreting procedure fire_delta_events2 with input of size 239 for LOIs [2023-12-02 15:48:55,060 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 15:49:09,106 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '542470#(and (= ~m_pc~0 1) (= ~m_st~0 1) (not (= ~token~0 (+ 6 ~local~0))))' at error location [2023-12-02 15:49:09,106 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 15:49:09,106 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 15:49:09,106 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7, 6] total 13 [2023-12-02 15:49:09,106 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [861036820] [2023-12-02 15:49:09,107 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 15:49:09,107 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-12-02 15:49:09,107 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:49:09,108 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-12-02 15:49:09,110 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=436, Invalid=5726, Unknown=0, NotChecked=0, Total=6162 [2023-12-02 15:49:09,110 INFO L87 Difference]: Start difference. First operand 65831 states and 93563 transitions. Second operand has 13 states, 13 states have (on average 15.23076923076923) internal successors, (198), 13 states have internal predecessors, (198), 8 states have call successors, (36), 7 states have call predecessors, (36), 8 states have return successors, (35), 8 states have call predecessors, (35), 8 states have call successors, (35) [2023-12-02 15:49:13,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:49:13,249 INFO L93 Difference]: Finished difference Result 137222 states and 194128 transitions. [2023-12-02 15:49:13,249 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2023-12-02 15:49:13,250 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 15.23076923076923) internal successors, (198), 13 states have internal predecessors, (198), 8 states have call successors, (36), 7 states have call predecessors, (36), 8 states have return successors, (35), 8 states have call predecessors, (35), 8 states have call successors, (35) Word has length 149 [2023-12-02 15:49:13,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:49:13,447 INFO L225 Difference]: With dead ends: 137222 [2023-12-02 15:49:13,448 INFO L226 Difference]: Without dead ends: 71398 [2023-12-02 15:49:13,601 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 492 GetRequests, 391 SyntacticMatches, 0 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3609 ImplicationChecksByTransitivity, 14.8s TimeCoverageRelationStatistics Valid=824, Invalid=9682, Unknown=0, NotChecked=0, Total=10506 [2023-12-02 15:49:13,602 INFO L413 NwaCegarLoop]: 201 mSDtfsCounter, 1797 mSDsluCounter, 841 mSDsCounter, 0 mSdLazyCounter, 553 mSolverCounterSat, 490 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1797 SdHoareTripleChecker+Valid, 1042 SdHoareTripleChecker+Invalid, 1043 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 490 IncrementalHoareTripleChecker+Valid, 553 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-12-02 15:49:13,602 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1797 Valid, 1042 Invalid, 1043 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [490 Valid, 553 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-12-02 15:49:13,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71398 states. [2023-12-02 15:49:16,527 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71398 to 66100. [2023-12-02 15:49:16,573 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66100 states, 56220 states have (on average 1.3609035930273923) internal successors, (76510), 56558 states have internal predecessors, (76510), 6048 states have call successors, (6048), 3640 states have call predecessors, (6048), 3831 states have return successors, (9534), 5902 states have call predecessors, (9534), 6046 states have call successors, (9534) [2023-12-02 15:49:16,748 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66100 states to 66100 states and 92092 transitions. [2023-12-02 15:49:16,751 INFO L78 Accepts]: Start accepts. Automaton has 66100 states and 92092 transitions. Word has length 149 [2023-12-02 15:49:16,752 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:49:16,752 INFO L495 AbstractCegarLoop]: Abstraction has 66100 states and 92092 transitions. [2023-12-02 15:49:16,752 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 15.23076923076923) internal successors, (198), 13 states have internal predecessors, (198), 8 states have call successors, (36), 7 states have call predecessors, (36), 8 states have return successors, (35), 8 states have call predecessors, (35), 8 states have call successors, (35) [2023-12-02 15:49:16,752 INFO L276 IsEmpty]: Start isEmpty. Operand 66100 states and 92092 transitions. [2023-12-02 15:49:16,814 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2023-12-02 15:49:16,814 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:49:16,815 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 15:49:16,820 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2023-12-02 15:49:17,015 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2023-12-02 15:49:17,015 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:49:17,016 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:49:17,016 INFO L85 PathProgramCache]: Analyzing trace with hash -1296776885, now seen corresponding path program 1 times [2023-12-02 15:49:17,016 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:49:17,016 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [308208445] [2023-12-02 15:49:17,016 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:49:17,016 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:49:17,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:49:17,136 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 21 proven. 8 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2023-12-02 15:49:17,136 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:49:17,136 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [308208445] [2023-12-02 15:49:17,136 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [308208445] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:49:17,137 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1270929041] [2023-12-02 15:49:17,137 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:49:17,137 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:49:17,137 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:49:17,138 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:49:17,143 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-12-02 15:49:17,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:49:17,340 INFO L262 TraceCheckSpWp]: Trace formula consists of 841 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 15:49:17,344 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:49:17,371 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 80 proven. 0 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2023-12-02 15:49:17,372 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 15:49:17,372 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1270929041] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:49:17,372 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 15:49:17,372 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2023-12-02 15:49:17,372 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1102585807] [2023-12-02 15:49:17,372 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:49:17,373 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 15:49:17,373 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:49:17,374 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 15:49:17,374 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-12-02 15:49:17,374 INFO L87 Difference]: Start difference. First operand 66100 states and 92092 transitions. Second operand has 3 states, 3 states have (on average 36.666666666666664) internal successors, (110), 3 states have internal predecessors, (110), 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 15:49:21,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:49:21,018 INFO L93 Difference]: Finished difference Result 126738 states and 178914 transitions. [2023-12-02 15:49:21,018 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 15:49:21,018 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 36.666666666666664) internal successors, (110), 3 states have internal predecessors, (110), 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 15:49:21,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:49:21,272 INFO L225 Difference]: With dead ends: 126738 [2023-12-02 15:49:21,272 INFO L226 Difference]: Without dead ends: 93082 [2023-12-02 15:49:21,346 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 155 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 15:49:21,346 INFO L413 NwaCegarLoop]: 274 mSDtfsCounter, 123 mSDsluCounter, 168 mSDsCounter, 0 mSdLazyCounter, 86 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 123 SdHoareTripleChecker+Valid, 442 SdHoareTripleChecker+Invalid, 86 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 86 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 15:49:21,347 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [123 Valid, 442 Invalid, 86 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 86 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 15:49:21,416 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93082 states. [2023-12-02 15:49:25,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93082 to 76752. [2023-12-02 15:49:25,216 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76752 states, 66248 states have (on average 1.3803586523366742) internal successors, (91446), 66586 states have internal predecessors, (91446), 6360 states have call successors, (6360), 3952 states have call predecessors, (6360), 4143 states have return successors, (9846), 6214 states have call predecessors, (9846), 6358 states have call successors, (9846) [2023-12-02 15:49:25,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76752 states to 76752 states and 107652 transitions. [2023-12-02 15:49:25,416 INFO L78 Accepts]: Start accepts. Automaton has 76752 states and 107652 transitions. Word has length 155 [2023-12-02 15:49:25,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:49:25,417 INFO L495 AbstractCegarLoop]: Abstraction has 76752 states and 107652 transitions. [2023-12-02 15:49:25,417 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 36.666666666666664) internal successors, (110), 3 states have internal predecessors, (110), 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 15:49:25,417 INFO L276 IsEmpty]: Start isEmpty. Operand 76752 states and 107652 transitions. [2023-12-02 15:49:25,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2023-12-02 15:49:25,506 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:49:25,506 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 15:49:25,511 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2023-12-02 15:49:25,707 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2023-12-02 15:49:25,707 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:49:25,707 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:49:25,708 INFO L85 PathProgramCache]: Analyzing trace with hash 2058954156, now seen corresponding path program 2 times [2023-12-02 15:49:25,708 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:49:25,708 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [675240256] [2023-12-02 15:49:25,708 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:49:25,708 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:49:25,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:49:25,971 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 10 proven. 43 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2023-12-02 15:49:25,971 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:49:25,972 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [675240256] [2023-12-02 15:49:25,972 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [675240256] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:49:25,972 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1012373061] [2023-12-02 15:49:25,972 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 15:49:25,972 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:49:25,972 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:49:25,973 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:49:25,975 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-12-02 15:49:26,167 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-12-02 15:49:26,167 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 15:49:26,170 INFO L262 TraceCheckSpWp]: Trace formula consists of 793 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 15:49:26,173 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:49:26,192 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 77 proven. 0 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2023-12-02 15:49:26,192 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 15:49:26,193 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1012373061] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:49:26,193 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 15:49:26,193 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-12-02 15:49:26,193 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [631643935] [2023-12-02 15:49:26,193 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:49:26,194 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 15:49:26,194 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:49:26,194 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 15:49:26,195 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 15:49:26,195 INFO L87 Difference]: Start difference. First operand 76752 states and 107652 transitions. Second operand has 3 states, 3 states have (on average 37.0) internal successors, (111), 3 states have internal predecessors, (111), 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 15:49:29,158 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:49:29,158 INFO L93 Difference]: Finished difference Result 110032 states and 154761 transitions. [2023-12-02 15:49:29,159 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 15:49:29,159 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 37.0) internal successors, (111), 3 states have internal predecessors, (111), 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 156 [2023-12-02 15:49:29,159 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:49:29,330 INFO L225 Difference]: With dead ends: 110032 [2023-12-02 15:49:29,330 INFO L226 Difference]: Without dead ends: 74336 [2023-12-02 15:49:29,394 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 158 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 15:49:29,395 INFO L413 NwaCegarLoop]: 180 mSDtfsCounter, 40 mSDsluCounter, 158 mSDsCounter, 0 mSdLazyCounter, 71 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 338 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 15:49:29,395 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [40 Valid, 338 Invalid, 71 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 71 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 15:49:29,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74336 states. [2023-12-02 15:49:32,912 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74336 to 74336. [2023-12-02 15:49:32,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74336 states, 64024 states have (on average 1.3825752842683994) internal successors, (88518), 64314 states have internal predecessors, (88518), 6360 states have call successors, (6360), 3952 states have call predecessors, (6360), 3951 states have return successors, (9558), 6070 states have call predecessors, (9558), 6358 states have call successors, (9558) [2023-12-02 15:49:33,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74336 states to 74336 states and 104436 transitions. [2023-12-02 15:49:33,131 INFO L78 Accepts]: Start accepts. Automaton has 74336 states and 104436 transitions. Word has length 156 [2023-12-02 15:49:33,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:49:33,131 INFO L495 AbstractCegarLoop]: Abstraction has 74336 states and 104436 transitions. [2023-12-02 15:49:33,132 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 37.0) internal successors, (111), 3 states have internal predecessors, (111), 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 15:49:33,132 INFO L276 IsEmpty]: Start isEmpty. Operand 74336 states and 104436 transitions. [2023-12-02 15:49:33,201 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2023-12-02 15:49:33,202 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:49:33,202 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 15:49:33,207 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2023-12-02 15:49:33,402 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2023-12-02 15:49:33,402 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:49:33,403 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:49:33,403 INFO L85 PathProgramCache]: Analyzing trace with hash -752098537, now seen corresponding path program 1 times [2023-12-02 15:49:33,403 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:49:33,403 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [43837838] [2023-12-02 15:49:33,403 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:49:33,403 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:49:33,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:49:33,655 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 10 proven. 43 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2023-12-02 15:49:33,655 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:49:33,655 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [43837838] [2023-12-02 15:49:33,655 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [43837838] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:49:33,655 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1246553684] [2023-12-02 15:49:33,655 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:49:33,656 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:49:33,656 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:49:33,657 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:49:33,663 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-12-02 15:49:33,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:49:33,825 INFO L262 TraceCheckSpWp]: Trace formula consists of 850 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 15:49:33,828 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:49:33,853 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 78 proven. 0 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2023-12-02 15:49:33,853 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 15:49:33,854 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1246553684] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:49:33,854 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 15:49:33,854 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-12-02 15:49:33,854 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [94358635] [2023-12-02 15:49:33,854 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:49:33,855 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 15:49:33,855 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:49:33,855 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 15:49:33,855 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 15:49:33,856 INFO L87 Difference]: Start difference. First operand 74336 states and 104436 transitions. Second operand has 3 states, 3 states have (on average 37.666666666666664) internal successors, (113), 3 states have internal predecessors, (113), 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 15:49:38,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:49:38,965 INFO L93 Difference]: Finished difference Result 178852 states and 254697 transitions. [2023-12-02 15:49:38,966 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 15:49:38,966 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 37.666666666666664) internal successors, (113), 3 states have internal predecessors, (113), 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 157 [2023-12-02 15:49:38,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:49:39,228 INFO L225 Difference]: With dead ends: 178852 [2023-12-02 15:49:39,228 INFO L226 Difference]: Without dead ends: 104574 [2023-12-02 15:49:39,408 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 159 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 15:49:39,408 INFO L413 NwaCegarLoop]: 180 mSDtfsCounter, 88 mSDsluCounter, 143 mSDsCounter, 0 mSdLazyCounter, 67 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 88 SdHoareTripleChecker+Valid, 323 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 67 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 15:49:39,408 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [88 Valid, 323 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 67 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 15:49:39,477 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104574 states. [2023-12-02 15:49:43,611 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104574 to 86928. [2023-12-02 15:49:43,658 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86928 states, 75894 states have (on average 1.4006904366616597) internal successors, (106304), 76185 states have internal predecessors, (106304), 6721 states have call successors, (6721), 4313 states have call predecessors, (6721), 4312 states have return successors, (9919), 6430 states have call predecessors, (9919), 6719 states have call successors, (9919) [2023-12-02 15:49:43,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86928 states to 86928 states and 122944 transitions. [2023-12-02 15:49:43,866 INFO L78 Accepts]: Start accepts. Automaton has 86928 states and 122944 transitions. Word has length 157 [2023-12-02 15:49:43,866 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:49:43,866 INFO L495 AbstractCegarLoop]: Abstraction has 86928 states and 122944 transitions. [2023-12-02 15:49:43,867 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 37.666666666666664) internal successors, (113), 3 states have internal predecessors, (113), 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 15:49:43,867 INFO L276 IsEmpty]: Start isEmpty. Operand 86928 states and 122944 transitions. [2023-12-02 15:49:43,943 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2023-12-02 15:49:43,943 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:49:43,944 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 15:49:43,949 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2023-12-02 15:49:44,144 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2023-12-02 15:49:44,145 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:49:44,145 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:49:44,145 INFO L85 PathProgramCache]: Analyzing trace with hash 622611168, now seen corresponding path program 1 times [2023-12-02 15:49:44,145 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:49:44,145 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [150679393] [2023-12-02 15:49:44,145 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:49:44,145 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:49:44,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:49:44,551 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 17 proven. 43 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2023-12-02 15:49:44,551 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:49:44,552 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [150679393] [2023-12-02 15:49:44,552 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [150679393] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:49:44,552 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1376110340] [2023-12-02 15:49:44,552 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:49:44,552 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:49:44,552 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:49:44,553 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:49:44,557 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-12-02 15:49:44,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:49:44,740 INFO L262 TraceCheckSpWp]: Trace formula consists of 856 conjuncts, 9 conjunts are in the unsatisfiable core [2023-12-02 15:49:44,744 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:49:44,828 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 68 proven. 0 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2023-12-02 15:49:44,828 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 15:49:44,828 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1376110340] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:49:44,828 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 15:49:44,828 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 10 [2023-12-02 15:49:44,829 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1816662523] [2023-12-02 15:49:44,829 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:49:44,829 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 15:49:44,829 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:49:44,830 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 15:49:44,830 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2023-12-02 15:49:44,831 INFO L87 Difference]: Start difference. First operand 86928 states and 122944 transitions. Second operand has 6 states, 6 states have (on average 17.5) internal successors, (105), 6 states have internal predecessors, (105), 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 15:49:51,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:49:51,297 INFO L93 Difference]: Finished difference Result 214944 states and 303558 transitions. [2023-12-02 15:49:51,297 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-12-02 15:49:51,298 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 17.5) internal successors, (105), 6 states have internal predecessors, (105), 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 159 [2023-12-02 15:49:51,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:49:51,575 INFO L225 Difference]: With dead ends: 214944 [2023-12-02 15:49:51,576 INFO L226 Difference]: Without dead ends: 128074 [2023-12-02 15:49:51,673 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 158 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 15:49:51,673 INFO L413 NwaCegarLoop]: 158 mSDtfsCounter, 587 mSDsluCounter, 218 mSDsCounter, 0 mSdLazyCounter, 149 mSolverCounterSat, 157 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 602 SdHoareTripleChecker+Valid, 376 SdHoareTripleChecker+Invalid, 306 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 157 IncrementalHoareTripleChecker+Valid, 149 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 15:49:51,673 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [602 Valid, 376 Invalid, 306 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [157 Valid, 149 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 15:49:51,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128074 states. [2023-12-02 15:49:58,666 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128074 to 128070. [2023-12-02 15:49:58,721 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128070 states, 111652 states have (on average 1.3862895425070756) internal successors, (154782), 112087 states have internal predecessors, (154782), 9959 states have call successors, (9959), 6459 states have call predecessors, (9959), 6458 states have return successors, (14641), 9524 states have call predecessors, (14641), 9957 states have call successors, (14641) [2023-12-02 15:49:59,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128070 states to 128070 states and 179382 transitions. [2023-12-02 15:49:59,040 INFO L78 Accepts]: Start accepts. Automaton has 128070 states and 179382 transitions. Word has length 159 [2023-12-02 15:49:59,040 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:49:59,041 INFO L495 AbstractCegarLoop]: Abstraction has 128070 states and 179382 transitions. [2023-12-02 15:49:59,041 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 17.5) internal successors, (105), 6 states have internal predecessors, (105), 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 15:49:59,041 INFO L276 IsEmpty]: Start isEmpty. Operand 128070 states and 179382 transitions. [2023-12-02 15:49:59,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2023-12-02 15:49:59,152 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:49:59,152 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 15:49:59,158 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2023-12-02 15:49:59,353 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:49:59,353 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:49:59,353 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:49:59,353 INFO L85 PathProgramCache]: Analyzing trace with hash -513088150, now seen corresponding path program 1 times [2023-12-02 15:49:59,354 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:49:59,354 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1100296981] [2023-12-02 15:49:59,354 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:49:59,354 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:49:59,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:49:59,443 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 23 proven. 6 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2023-12-02 15:49:59,443 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:49:59,443 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1100296981] [2023-12-02 15:49:59,444 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1100296981] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:49:59,444 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [913459990] [2023-12-02 15:49:59,444 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:49:59,444 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:49:59,444 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:49:59,445 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:49:59,447 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-12-02 15:49:59,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:49:59,579 INFO L262 TraceCheckSpWp]: Trace formula consists of 841 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 15:49:59,582 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:49:59,602 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 80 proven. 0 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2023-12-02 15:49:59,603 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 15:49:59,603 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [913459990] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:49:59,603 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 15:49:59,603 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2023-12-02 15:49:59,603 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1179684140] [2023-12-02 15:49:59,603 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:49:59,604 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 15:49:59,604 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:49:59,604 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 15:49:59,604 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-12-02 15:49:59,604 INFO L87 Difference]: Start difference. First operand 128070 states and 179382 transitions. Second operand has 3 states, 3 states have (on average 36.666666666666664) internal successors, (110), 3 states have internal predecessors, (110), 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 15:50:07,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:50:07,297 INFO L93 Difference]: Finished difference Result 246162 states and 347898 transitions. [2023-12-02 15:50:07,298 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 15:50:07,298 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 36.666666666666664) internal successors, (110), 3 states have internal predecessors, (110), 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 15:50:07,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:50:07,829 INFO L225 Difference]: With dead ends: 246162 [2023-12-02 15:50:07,829 INFO L226 Difference]: Without dead ends: 160808 [2023-12-02 15:50:07,931 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 155 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 15:50:07,932 INFO L413 NwaCegarLoop]: 271 mSDtfsCounter, 111 mSDsluCounter, 168 mSDsCounter, 0 mSdLazyCounter, 84 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 111 SdHoareTripleChecker+Valid, 439 SdHoareTripleChecker+Invalid, 84 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 84 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 15:50:07,932 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [111 Valid, 439 Invalid, 84 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 84 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 15:50:08,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160808 states. [2023-12-02 15:50:15,950 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160808 to 148518. [2023-12-02 15:50:16,019 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 148518 states, 130804 states have (on average 1.3996360967554509) internal successors, (183078), 131239 states have internal predecessors, (183078), 10607 states have call successors, (10607), 7107 states have call predecessors, (10607), 7106 states have return successors, (15289), 10172 states have call predecessors, (15289), 10605 states have call successors, (15289) [2023-12-02 15:50:16,394 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148518 states to 148518 states and 208974 transitions. [2023-12-02 15:50:16,399 INFO L78 Accepts]: Start accepts. Automaton has 148518 states and 208974 transitions. Word has length 155 [2023-12-02 15:50:16,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:50:16,399 INFO L495 AbstractCegarLoop]: Abstraction has 148518 states and 208974 transitions. [2023-12-02 15:50:16,399 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 36.666666666666664) internal successors, (110), 3 states have internal predecessors, (110), 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 15:50:16,399 INFO L276 IsEmpty]: Start isEmpty. Operand 148518 states and 208974 transitions. [2023-12-02 15:50:16,532 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2023-12-02 15:50:16,532 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:50:16,532 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 15:50:16,538 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2023-12-02 15:50:16,732 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:50:16,732 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:50:16,733 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:50:16,733 INFO L85 PathProgramCache]: Analyzing trace with hash -165962713, now seen corresponding path program 1 times [2023-12-02 15:50:16,733 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:50:16,733 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2019059457] [2023-12-02 15:50:16,733 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:50:16,733 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:50:16,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:50:16,898 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 17 proven. 43 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2023-12-02 15:50:16,898 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:50:16,898 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2019059457] [2023-12-02 15:50:16,899 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2019059457] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:50:16,899 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [167461733] [2023-12-02 15:50:16,899 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:50:16,899 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:50:16,899 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:50:16,900 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:50:16,902 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-12-02 15:50:17,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:50:17,054 INFO L262 TraceCheckSpWp]: Trace formula consists of 856 conjuncts, 9 conjunts are in the unsatisfiable core [2023-12-02 15:50:17,057 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:50:17,132 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 73 proven. 0 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2023-12-02 15:50:17,132 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 15:50:17,132 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [167461733] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:50:17,133 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 15:50:17,133 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 10 [2023-12-02 15:50:17,133 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1809263536] [2023-12-02 15:50:17,133 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:50:17,133 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 15:50:17,133 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:50:17,133 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 15:50:17,134 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2023-12-02 15:50:17,134 INFO L87 Difference]: Start difference. First operand 148518 states and 208974 transitions. Second operand has 6 states, 6 states have (on average 18.166666666666668) internal successors, (109), 6 states have internal predecessors, (109), 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 15:50:29,351 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:50:29,351 INFO L93 Difference]: Finished difference Result 367278 states and 516120 transitions. [2023-12-02 15:50:29,352 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-12-02 15:50:29,352 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 18.166666666666668) internal successors, (109), 6 states have internal predecessors, (109), 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 159 [2023-12-02 15:50:29,352 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:50:29,973 INFO L225 Difference]: With dead ends: 367278 [2023-12-02 15:50:29,973 INFO L226 Difference]: Without dead ends: 218818 [2023-12-02 15:50:30,123 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 158 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 15:50:30,124 INFO L413 NwaCegarLoop]: 155 mSDtfsCounter, 537 mSDsluCounter, 225 mSDsCounter, 0 mSdLazyCounter, 154 mSolverCounterSat, 127 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 552 SdHoareTripleChecker+Valid, 380 SdHoareTripleChecker+Invalid, 281 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 127 IncrementalHoareTripleChecker+Valid, 154 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 15:50:30,124 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [552 Valid, 380 Invalid, 281 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [127 Valid, 154 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 15:50:30,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 218818 states. [2023-12-02 15:50:42,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 218818 to 218814. [2023-12-02 15:50:42,502 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 218814 states, 192444 states have (on average 1.3838727110224274) internal successors, (266318), 193095 states have internal predecessors, (266318), 15727 states have call successors, (15727), 10643 states have call predecessors, (15727), 10642 states have return successors, (22573), 15076 states have call predecessors, (22573), 15725 states have call successors, (22573) [2023-12-02 15:50:43,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 218814 states to 218814 states and 304618 transitions. [2023-12-02 15:50:43,326 INFO L78 Accepts]: Start accepts. Automaton has 218814 states and 304618 transitions. Word has length 159 [2023-12-02 15:50:43,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:50:43,327 INFO L495 AbstractCegarLoop]: Abstraction has 218814 states and 304618 transitions. [2023-12-02 15:50:43,327 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 18.166666666666668) internal successors, (109), 6 states have internal predecessors, (109), 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 15:50:43,327 INFO L276 IsEmpty]: Start isEmpty. Operand 218814 states and 304618 transitions. [2023-12-02 15:50:43,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2023-12-02 15:50:43,790 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:50:43,790 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 15:50:43,795 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2023-12-02 15:50:43,990 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:50:43,990 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:50:43,991 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:50:43,991 INFO L85 PathProgramCache]: Analyzing trace with hash 1308565700, now seen corresponding path program 1 times [2023-12-02 15:50:43,991 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:50:43,991 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1794114671] [2023-12-02 15:50:43,991 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:50:43,991 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:50:44,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:50:44,069 INFO L134 CoverageAnalysis]: Checked inductivity of 107 backedges. 22 proven. 9 refuted. 0 times theorem prover too weak. 76 trivial. 0 not checked. [2023-12-02 15:50:44,069 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:50:44,070 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1794114671] [2023-12-02 15:50:44,070 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1794114671] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:50:44,070 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1670766372] [2023-12-02 15:50:44,070 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:50:44,070 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:50:44,070 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:50:44,071 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:50:44,073 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2023-12-02 15:50:44,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:50:44,235 INFO L262 TraceCheckSpWp]: Trace formula consists of 850 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 15:50:44,238 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:50:44,263 INFO L134 CoverageAnalysis]: Checked inductivity of 107 backedges. 84 proven. 0 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2023-12-02 15:50:44,263 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 15:50:44,263 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1670766372] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:50:44,263 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 15:50:44,263 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2023-12-02 15:50:44,263 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1388382344] [2023-12-02 15:50:44,264 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:50:44,264 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 15:50:44,264 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:50:44,264 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 15:50:44,265 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-12-02 15:50:44,265 INFO L87 Difference]: Start difference. First operand 218814 states and 304618 transitions. Second operand has 3 states, 3 states have (on average 38.0) internal successors, (114), 3 states have internal predecessors, (114), 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 15:50:58,955 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:50:58,955 INFO L93 Difference]: Finished difference Result 425026 states and 596920 transitions. [2023-12-02 15:50:58,955 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 15:50:58,955 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 38.0) internal successors, (114), 3 states have internal predecessors, (114), 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 159 [2023-12-02 15:50:58,956 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:50:59,656 INFO L225 Difference]: With dead ends: 425026 [2023-12-02 15:50:59,656 INFO L226 Difference]: Without dead ends: 278514 [2023-12-02 15:50:59,954 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 159 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 15:50:59,954 INFO L413 NwaCegarLoop]: 279 mSDtfsCounter, 115 mSDsluCounter, 168 mSDsCounter, 0 mSdLazyCounter, 86 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 115 SdHoareTripleChecker+Valid, 447 SdHoareTripleChecker+Invalid, 86 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 86 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 15:50:59,955 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [115 Valid, 447 Invalid, 86 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 86 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 15:51:00,130 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 278514 states. [2023-12-02 15:51:14,382 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 278514 to 257766. [2023-12-02 15:51:14,496 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 257766 states, 228804 states have (on average 1.3943025471582664) internal successors, (319022), 229455 states have internal predecessors, (319022), 17023 states have call successors, (17023), 11939 states have call predecessors, (17023), 11938 states have return successors, (23869), 16372 states have call predecessors, (23869), 17021 states have call successors, (23869) [2023-12-02 15:51:15,390 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 257766 states to 257766 states and 359914 transitions. [2023-12-02 15:51:15,397 INFO L78 Accepts]: Start accepts. Automaton has 257766 states and 359914 transitions. Word has length 159 [2023-12-02 15:51:15,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:51:15,397 INFO L495 AbstractCegarLoop]: Abstraction has 257766 states and 359914 transitions. [2023-12-02 15:51:15,397 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 38.0) internal successors, (114), 3 states have internal predecessors, (114), 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 15:51:15,397 INFO L276 IsEmpty]: Start isEmpty. Operand 257766 states and 359914 transitions. [2023-12-02 15:51:15,633 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2023-12-02 15:51:15,633 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:51:15,633 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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 15:51:15,637 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2023-12-02 15:51:15,833 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2023-12-02 15:51:15,833 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:51:15,834 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:51:15,834 INFO L85 PathProgramCache]: Analyzing trace with hash 1296938166, now seen corresponding path program 1 times [2023-12-02 15:51:15,834 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:51:15,834 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1854887769] [2023-12-02 15:51:15,834 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:51:15,834 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:51:15,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:51:15,988 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 17 proven. 45 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2023-12-02 15:51:15,988 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:51:15,988 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1854887769] [2023-12-02 15:51:15,988 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1854887769] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:51:15,988 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [893919156] [2023-12-02 15:51:15,988 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:51:15,988 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:51:15,988 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:51:15,989 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:51:15,991 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2023-12-02 15:51:16,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:51:16,179 INFO L262 TraceCheckSpWp]: Trace formula consists of 862 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 15:51:16,182 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:51:16,220 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 104 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-12-02 15:51:16,220 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 15:51:16,220 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [893919156] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:51:16,220 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 15:51:16,221 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-12-02 15:51:16,221 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1876931969] [2023-12-02 15:51:16,221 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:51:16,221 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 15:51:16,221 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:51:16,222 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 15:51:16,222 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 15:51:16,222 INFO L87 Difference]: Start difference. First operand 257766 states and 359914 transitions. Second operand has 3 states, 3 states have (on average 44.666666666666664) internal successors, (134), 3 states have internal predecessors, (134), 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 15:51:30,433 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:51:30,433 INFO L93 Difference]: Finished difference Result 443558 states and 630644 transitions. [2023-12-02 15:51:30,433 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 15:51:30,434 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 44.666666666666664) internal successors, (134), 3 states have internal predecessors, (134), 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 163 [2023-12-02 15:51:30,434 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:51:31,015 INFO L225 Difference]: With dead ends: 443558 [2023-12-02 15:51:31,015 INFO L226 Difference]: Without dead ends: 258094 [2023-12-02 15:51:31,331 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 165 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 15:51:31,331 INFO L413 NwaCegarLoop]: 288 mSDtfsCounter, 149 mSDsluCounter, 152 mSDsCounter, 0 mSdLazyCounter, 89 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 149 SdHoareTripleChecker+Valid, 440 SdHoareTripleChecker+Invalid, 91 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 89 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 15:51:31,332 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [149 Valid, 440 Invalid, 91 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 89 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 15:51:31,506 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 258094 states. [2023-12-02 15:51:45,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 258094 to 255822. [2023-12-02 15:51:45,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 255822 states, 226860 states have (on average 1.380543066208234) internal successors, (313190), 227511 states have internal predecessors, (313190), 17023 states have call successors, (17023), 11939 states have call predecessors, (17023), 11938 states have return successors, (23869), 16372 states have call predecessors, (23869), 17021 states have call successors, (23869) [2023-12-02 15:51:46,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 255822 states to 255822 states and 354082 transitions. [2023-12-02 15:51:46,707 INFO L78 Accepts]: Start accepts. Automaton has 255822 states and 354082 transitions. Word has length 163 [2023-12-02 15:51:46,707 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:51:46,707 INFO L495 AbstractCegarLoop]: Abstraction has 255822 states and 354082 transitions. [2023-12-02 15:51:46,707 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 44.666666666666664) internal successors, (134), 3 states have internal predecessors, (134), 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 15:51:46,707 INFO L276 IsEmpty]: Start isEmpty. Operand 255822 states and 354082 transitions. [2023-12-02 15:51:46,919 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2023-12-02 15:51:46,920 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:51:46,920 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 15:51:46,925 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2023-12-02 15:51:47,120 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2023-12-02 15:51:47,121 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:51:47,121 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:51:47,121 INFO L85 PathProgramCache]: Analyzing trace with hash -1473834346, now seen corresponding path program 1 times [2023-12-02 15:51:47,121 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:51:47,121 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [890082029] [2023-12-02 15:51:47,121 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:51:47,121 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:51:47,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:51:47,641 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 17 proven. 43 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2023-12-02 15:51:47,641 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:51:47,641 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [890082029] [2023-12-02 15:51:47,641 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [890082029] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:51:47,641 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1664146621] [2023-12-02 15:51:47,641 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:51:47,641 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:51:47,642 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:51:47,642 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:51:47,643 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a0d48da-59dc-487b-99ab-c321e7a8b936/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2023-12-02 15:51:47,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:51:47,814 INFO L262 TraceCheckSpWp]: Trace formula consists of 868 conjuncts, 9 conjunts are in the unsatisfiable core [2023-12-02 15:51:47,818 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:51:47,886 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 64 proven. 0 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2023-12-02 15:51:47,886 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 15:51:47,886 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1664146621] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:51:47,886 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 15:51:47,886 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 7 [2023-12-02 15:51:47,886 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [314932511] [2023-12-02 15:51:47,886 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:51:47,887 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 15:51:47,887 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:51:47,888 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 15:51:47,888 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2023-12-02 15:51:47,888 INFO L87 Difference]: Start difference. First operand 255822 states and 354082 transitions. Second operand has 6 states, 6 states have (on average 17.166666666666668) internal successors, (103), 6 states have internal predecessors, (103), 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 15:52:09,853 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:52:09,854 INFO L93 Difference]: Finished difference Result 631608 states and 872514 transitions. [2023-12-02 15:52:09,854 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-12-02 15:52:09,854 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 17.166666666666668) internal successors, (103), 6 states have internal predecessors, (103), 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 163 [2023-12-02 15:52:09,854 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:52:10,937 INFO L225 Difference]: With dead ends: 631608 [2023-12-02 15:52:10,937 INFO L226 Difference]: Without dead ends: 375844 [2023-12-02 15:52:11,271 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 165 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 15:52:11,272 INFO L413 NwaCegarLoop]: 153 mSDtfsCounter, 600 mSDsluCounter, 226 mSDsCounter, 0 mSdLazyCounter, 148 mSolverCounterSat, 163 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 615 SdHoareTripleChecker+Valid, 379 SdHoareTripleChecker+Invalid, 311 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 163 IncrementalHoareTripleChecker+Valid, 148 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 15:52:11,272 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [615 Valid, 379 Invalid, 311 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [163 Valid, 148 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time]