./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.02.cil-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 30e01a73 Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.02.cil-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire --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 d9dd329404607c04c3b8409033c911abc5eb1af40daa0f8673d76c8f1e85e1ae --- Real Ultimate output --- This is Ultimate 0.2.3-dev-30e01a7 [2023-11-23 20:40:11,502 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-23 20:40:11,583 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-23 20:40:11,589 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-23 20:40:11,590 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-23 20:40:11,625 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-23 20:40:11,626 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-23 20:40:11,627 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-23 20:40:11,628 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-23 20:40:11,629 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-23 20:40:11,629 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-23 20:40:11,630 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-23 20:40:11,631 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-23 20:40:11,631 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-23 20:40:11,632 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-23 20:40:11,633 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-23 20:40:11,633 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-23 20:40:11,634 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-23 20:40:11,635 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-23 20:40:11,635 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-23 20:40:11,636 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-23 20:40:11,637 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-23 20:40:11,638 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-23 20:40:11,639 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-23 20:40:11,639 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-23 20:40:11,640 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-23 20:40:11,640 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-23 20:40:11,641 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-23 20:40:11,642 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-23 20:40:11,642 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-23 20:40:11,643 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-23 20:40:11,643 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-23 20:40:11,644 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-23 20:40:11,644 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-23 20:40:11,645 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-23 20:40:11,645 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-23 20:40:11,646 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-23 20:40:11,646 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 20:40:11,647 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-23 20:40:11,647 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-23 20:40:11,647 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-23 20:40:11,648 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-23 20:40:11,648 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-23 20:40:11,649 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-23 20:40:11,649 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-23 20:40:11,649 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-23 20:40:11,649 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-23 20:40:11,650 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_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> d9dd329404607c04c3b8409033c911abc5eb1af40daa0f8673d76c8f1e85e1ae [2023-11-23 20:40:11,980 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-23 20:40:12,015 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-23 20:40:12,018 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-23 20:40:12,020 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-23 20:40:12,021 INFO L274 PluginConnector]: CDTParser initialized [2023-11-23 20:40:12,022 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/../../sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.02.cil-2.c [2023-11-23 20:40:15,159 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-23 20:40:15,419 INFO L384 CDTParser]: Found 1 translation units. [2023-11-23 20:40:15,420 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.02.cil-2.c [2023-11-23 20:40:15,434 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/data/78238c95c/69e62a2d37ff443d8042701d5bf555bc/FLAG1da22d96a [2023-11-23 20:40:15,448 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/data/78238c95c/69e62a2d37ff443d8042701d5bf555bc [2023-11-23 20:40:15,450 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-23 20:40:15,452 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-23 20:40:15,453 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-23 20:40:15,454 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-23 20:40:15,462 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-23 20:40:15,463 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 08:40:15" (1/1) ... [2023-11-23 20:40:15,464 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3fb5226b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:40:15, skipping insertion in model container [2023-11-23 20:40:15,464 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 08:40:15" (1/1) ... [2023-11-23 20:40:15,531 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-23 20:40:15,683 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_ed402fb9-1411-43d5-848f-b42658c3bde9/sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.02.cil-2.c[911,924] [2023-11-23 20:40:15,780 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_ed402fb9-1411-43d5-848f-b42658c3bde9/sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.02.cil-2.c[8416,8429] [2023-11-23 20:40:15,819 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 20:40:15,837 INFO L202 MainTranslator]: Completed pre-run [2023-11-23 20:40:15,850 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_ed402fb9-1411-43d5-848f-b42658c3bde9/sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.02.cil-2.c[911,924] [2023-11-23 20:40:15,888 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_ed402fb9-1411-43d5-848f-b42658c3bde9/sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.02.cil-2.c[8416,8429] [2023-11-23 20:40:15,920 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 20:40:15,944 INFO L206 MainTranslator]: Completed translation [2023-11-23 20:40:15,944 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:40:15 WrapperNode [2023-11-23 20:40:15,944 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-23 20:40:15,946 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-23 20:40:15,946 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-23 20:40:15,946 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-23 20:40:15,953 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:40:15" (1/1) ... [2023-11-23 20:40:15,966 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:40:15" (1/1) ... [2023-11-23 20:40:16,011 INFO L138 Inliner]: procedures = 59, calls = 68, calls flagged for inlining = 27, calls inlined = 27, statements flattened = 514 [2023-11-23 20:40:16,012 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-23 20:40:16,013 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-23 20:40:16,013 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-23 20:40:16,013 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-23 20:40:16,023 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:40:15" (1/1) ... [2023-11-23 20:40:16,023 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:40:15" (1/1) ... [2023-11-23 20:40:16,027 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:40:15" (1/1) ... [2023-11-23 20:40:16,028 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:40:15" (1/1) ... [2023-11-23 20:40:16,039 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:40:15" (1/1) ... [2023-11-23 20:40:16,048 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:40:15" (1/1) ... [2023-11-23 20:40:16,052 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:40:15" (1/1) ... [2023-11-23 20:40:16,055 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:40:15" (1/1) ... [2023-11-23 20:40:16,060 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-23 20:40:16,061 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-23 20:40:16,061 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-23 20:40:16,062 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-23 20:40:16,062 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:40:15" (1/1) ... [2023-11-23 20:40:16,068 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 20:40:16,093 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:40:16,110 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-23 20:40:16,120 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-23 20:40:16,143 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-23 20:40:16,144 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2023-11-23 20:40:16,144 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2023-11-23 20:40:16,144 INFO L130 BoogieDeclarations]: Found specification of procedure is_do_write_p_triggered [2023-11-23 20:40:16,145 INFO L138 BoogieDeclarations]: Found implementation of procedure is_do_write_p_triggered [2023-11-23 20:40:16,145 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread1 [2023-11-23 20:40:16,145 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread1 [2023-11-23 20:40:16,145 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread2 [2023-11-23 20:40:16,145 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread2 [2023-11-23 20:40:16,146 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events1 [2023-11-23 20:40:16,146 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events1 [2023-11-23 20:40:16,146 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events2 [2023-11-23 20:40:16,146 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events2 [2023-11-23 20:40:16,147 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads2 [2023-11-23 20:40:16,147 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads2 [2023-11-23 20:40:16,147 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads1 [2023-11-23 20:40:16,147 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads1 [2023-11-23 20:40:16,147 INFO L130 BoogieDeclarations]: Found specification of procedure is_do_read_c_triggered [2023-11-23 20:40:16,148 INFO L138 BoogieDeclarations]: Found implementation of procedure is_do_read_c_triggered [2023-11-23 20:40:16,148 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels1 [2023-11-23 20:40:16,148 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels1 [2023-11-23 20:40:16,148 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels2 [2023-11-23 20:40:16,149 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels2 [2023-11-23 20:40:16,149 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-23 20:40:16,149 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events2 [2023-11-23 20:40:16,149 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events2 [2023-11-23 20:40:16,150 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events1 [2023-11-23 20:40:16,150 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events1 [2023-11-23 20:40:16,150 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-23 20:40:16,150 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-23 20:40:16,150 INFO L130 BoogieDeclarations]: Found specification of procedure error1 [2023-11-23 20:40:16,151 INFO L138 BoogieDeclarations]: Found implementation of procedure error1 [2023-11-23 20:40:16,151 INFO L130 BoogieDeclarations]: Found specification of procedure error2 [2023-11-23 20:40:16,151 INFO L138 BoogieDeclarations]: Found implementation of procedure error2 [2023-11-23 20:40:16,255 INFO L241 CfgBuilder]: Building ICFG [2023-11-23 20:40:16,258 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-23 20:40:16,861 INFO L775 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##56: assume !(1 == ~q_free~0); [2023-11-23 20:40:16,861 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; [2023-11-23 20:40:16,960 INFO L282 CfgBuilder]: Performing block encoding [2023-11-23 20:40:17,252 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-23 20:40:17,252 INFO L309 CfgBuilder]: Removed 9 assume(true) statements. [2023-11-23 20:40:17,254 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 08:40:17 BoogieIcfgContainer [2023-11-23 20:40:17,254 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-23 20:40:17,260 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-23 20:40:17,260 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-23 20:40:17,263 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-23 20:40:17,264 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 08:40:15" (1/3) ... [2023-11-23 20:40:17,265 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2d2001fd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 08:40:17, skipping insertion in model container [2023-11-23 20:40:17,265 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:40:15" (2/3) ... [2023-11-23 20:40:17,267 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2d2001fd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 08:40:17, skipping insertion in model container [2023-11-23 20:40:17,267 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 08:40:17" (3/3) ... [2023-11-23 20:40:17,268 INFO L112 eAbstractionObserver]: Analyzing ICFG pc_sfifo_3.cil+token_ring.02.cil-2.c [2023-11-23 20:40:17,284 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-23 20:40:17,284 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2023-11-23 20:40:17,347 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-23 20:40:17,357 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;@53ab1648, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-23 20:40:17,357 INFO L358 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2023-11-23 20:40:17,363 INFO L276 IsEmpty]: Start isEmpty. Operand has 166 states, 114 states have (on average 1.4912280701754386) internal successors, (170), 122 states have internal predecessors, (170), 34 states have call successors, (34), 15 states have call predecessors, (34), 15 states have return successors, (34), 32 states have call predecessors, (34), 34 states have call successors, (34) [2023-11-23 20:40:17,379 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2023-11-23 20:40:17,380 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:40:17,380 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] [2023-11-23 20:40:17,381 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:40:17,388 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:40:17,388 INFO L85 PathProgramCache]: Analyzing trace with hash 1393167113, now seen corresponding path program 1 times [2023-11-23 20:40:17,396 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:40:17,397 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [606797860] [2023-11-23 20:40:17,397 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:40:17,397 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:40:17,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:40:17,907 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:40:17,908 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:40:17,908 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [606797860] [2023-11-23 20:40:17,909 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [606797860] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:40:17,909 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:40:17,909 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-23 20:40:17,911 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [515148698] [2023-11-23 20:40:17,911 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:40:17,915 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-23 20:40:17,916 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:40:17,946 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-23 20:40:17,947 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-23 20:40:17,950 INFO L87 Difference]: Start difference. First operand has 166 states, 114 states have (on average 1.4912280701754386) internal successors, (170), 122 states have internal predecessors, (170), 34 states have call successors, (34), 15 states have call predecessors, (34), 15 states have return successors, (34), 32 states have call predecessors, (34), 34 states have call successors, (34) Second operand has 5 states, 5 states have (on average 5.4) internal successors, (27), 5 states have internal predecessors, (27), 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) [2023-11-23 20:40:18,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:40:18,897 INFO L93 Difference]: Finished difference Result 605 states and 895 transitions. [2023-11-23 20:40:18,899 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-23 20:40:18,901 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 5.4) internal successors, (27), 5 states have internal predecessors, (27), 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 38 [2023-11-23 20:40:18,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:40:18,926 INFO L225 Difference]: With dead ends: 605 [2023-11-23 20:40:18,927 INFO L226 Difference]: Without dead ends: 434 [2023-11-23 20:40:18,936 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 [2023-11-23 20:40:18,943 INFO L413 NwaCegarLoop]: 256 mSDtfsCounter, 579 mSDsluCounter, 331 mSDsCounter, 0 mSdLazyCounter, 343 mSolverCounterSat, 189 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 581 SdHoareTripleChecker+Valid, 587 SdHoareTripleChecker+Invalid, 532 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 189 IncrementalHoareTripleChecker+Valid, 343 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-11-23 20:40:18,945 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [581 Valid, 587 Invalid, 532 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [189 Valid, 343 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-11-23 20:40:18,969 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 434 states. [2023-11-23 20:40:19,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 434 to 421. [2023-11-23 20:40:19,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 421 states, 303 states have (on average 1.3795379537953796) internal successors, (418), 311 states have internal predecessors, (418), 79 states have call successors, (79), 39 states have call predecessors, (79), 37 states have return successors, (97), 72 states have call predecessors, (97), 75 states have call successors, (97) [2023-11-23 20:40:19,102 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 421 states to 421 states and 594 transitions. [2023-11-23 20:40:19,104 INFO L78 Accepts]: Start accepts. Automaton has 421 states and 594 transitions. Word has length 38 [2023-11-23 20:40:19,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:40:19,105 INFO L495 AbstractCegarLoop]: Abstraction has 421 states and 594 transitions. [2023-11-23 20:40:19,106 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 5.4) internal successors, (27), 5 states have internal predecessors, (27), 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) [2023-11-23 20:40:19,106 INFO L276 IsEmpty]: Start isEmpty. Operand 421 states and 594 transitions. [2023-11-23 20:40:19,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2023-11-23 20:40:19,115 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:40:19,116 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:40:19,116 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-23 20:40:19,116 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:40:19,117 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:40:19,117 INFO L85 PathProgramCache]: Analyzing trace with hash -1386693914, now seen corresponding path program 1 times [2023-11-23 20:40:19,118 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:40:19,118 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [761265538] [2023-11-23 20:40:19,119 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:40:19,121 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:40:19,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:40:19,225 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:40:19,225 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:40:19,225 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [761265538] [2023-11-23 20:40:19,226 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [761265538] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:40:19,226 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:40:19,226 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-23 20:40:19,226 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1684024943] [2023-11-23 20:40:19,227 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:40:19,228 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-23 20:40:19,228 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:40:19,229 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-23 20:40:19,229 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-23 20:40:19,230 INFO L87 Difference]: Start difference. First operand 421 states and 594 transitions. Second operand has 4 states, 4 states have (on average 7.25) internal successors, (29), 4 states have internal predecessors, (29), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 3 states have call predecessors, (7), 4 states have call successors, (7) [2023-11-23 20:40:19,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:40:19,579 INFO L93 Difference]: Finished difference Result 621 states and 871 transitions. [2023-11-23 20:40:19,580 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-23 20:40:19,580 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 7.25) internal successors, (29), 4 states have internal predecessors, (29), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 3 states have call predecessors, (7), 4 states have call successors, (7) Word has length 44 [2023-11-23 20:40:19,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:40:19,585 INFO L225 Difference]: With dead ends: 621 [2023-11-23 20:40:19,585 INFO L226 Difference]: Without dead ends: 550 [2023-11-23 20:40:19,586 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-23 20:40:19,588 INFO L413 NwaCegarLoop]: 241 mSDtfsCounter, 280 mSDsluCounter, 172 mSDsCounter, 0 mSdLazyCounter, 217 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 280 SdHoareTripleChecker+Valid, 413 SdHoareTripleChecker+Invalid, 230 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 217 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-23 20:40:19,589 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [280 Valid, 413 Invalid, 230 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 217 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-23 20:40:19,590 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 550 states. [2023-11-23 20:40:19,661 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 550 to 539. [2023-11-23 20:40:19,663 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 539 states, 387 states have (on average 1.3695090439276485) internal successors, (530), 395 states have internal predecessors, (530), 99 states have call successors, (99), 53 states have call predecessors, (99), 51 states have return successors, (120), 92 states have call predecessors, (120), 95 states have call successors, (120) [2023-11-23 20:40:19,668 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 539 states to 539 states and 749 transitions. [2023-11-23 20:40:19,668 INFO L78 Accepts]: Start accepts. Automaton has 539 states and 749 transitions. Word has length 44 [2023-11-23 20:40:19,668 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:40:19,668 INFO L495 AbstractCegarLoop]: Abstraction has 539 states and 749 transitions. [2023-11-23 20:40:19,669 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 7.25) internal successors, (29), 4 states have internal predecessors, (29), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 3 states have call predecessors, (7), 4 states have call successors, (7) [2023-11-23 20:40:19,669 INFO L276 IsEmpty]: Start isEmpty. Operand 539 states and 749 transitions. [2023-11-23 20:40:19,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2023-11-23 20:40:19,671 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:40:19,671 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:40:19,671 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-23 20:40:19,671 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:40:19,672 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:40:19,672 INFO L85 PathProgramCache]: Analyzing trace with hash -1962806607, now seen corresponding path program 1 times [2023-11-23 20:40:19,672 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:40:19,672 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1606645982] [2023-11-23 20:40:19,673 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:40:19,673 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:40:19,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:40:19,778 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:40:19,778 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:40:19,778 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1606645982] [2023-11-23 20:40:19,778 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1606645982] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:40:19,779 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:40:19,779 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-11-23 20:40:19,779 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1603997652] [2023-11-23 20:40:19,779 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:40:19,780 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-23 20:40:19,780 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:40:19,781 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-23 20:40:19,781 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 20:40:19,781 INFO L87 Difference]: Start difference. First operand 539 states and 749 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) [2023-11-23 20:40:20,614 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:40:20,614 INFO L93 Difference]: Finished difference Result 1076 states and 1472 transitions. [2023-11-23 20:40:20,615 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-23 20:40:20,615 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 [2023-11-23 20:40:20,616 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:40:20,624 INFO L225 Difference]: With dead ends: 1076 [2023-11-23 20:40:20,625 INFO L226 Difference]: Without dead ends: 610 [2023-11-23 20:40:20,630 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 [2023-11-23 20:40:20,633 INFO L413 NwaCegarLoop]: 293 mSDtfsCounter, 672 mSDsluCounter, 450 mSDsCounter, 0 mSdLazyCounter, 649 mSolverCounterSat, 240 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 680 SdHoareTripleChecker+Valid, 743 SdHoareTripleChecker+Invalid, 889 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 240 IncrementalHoareTripleChecker+Valid, 649 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-11-23 20:40:20,636 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [680 Valid, 743 Invalid, 889 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [240 Valid, 649 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-11-23 20:40:20,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 610 states. [2023-11-23 20:40:20,716 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 610 to 525. [2023-11-23 20:40:20,718 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 525 states, 373 states have (on average 1.3324396782841823) internal successors, (497), 381 states have internal predecessors, (497), 99 states have call successors, (99), 53 states have call predecessors, (99), 51 states have return successors, (117), 92 states have call predecessors, (117), 95 states have call successors, (117) [2023-11-23 20:40:20,722 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 525 states to 525 states and 713 transitions. [2023-11-23 20:40:20,723 INFO L78 Accepts]: Start accepts. Automaton has 525 states and 713 transitions. Word has length 45 [2023-11-23 20:40:20,723 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:40:20,724 INFO L495 AbstractCegarLoop]: Abstraction has 525 states and 713 transitions. [2023-11-23 20:40:20,724 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) [2023-11-23 20:40:20,724 INFO L276 IsEmpty]: Start isEmpty. Operand 525 states and 713 transitions. [2023-11-23 20:40:20,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2023-11-23 20:40:20,726 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:40:20,726 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:40:20,727 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-23 20:40:20,727 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:40:20,727 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:40:20,728 INFO L85 PathProgramCache]: Analyzing trace with hash -500246002, now seen corresponding path program 1 times [2023-11-23 20:40:20,728 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:40:20,728 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [789138568] [2023-11-23 20:40:20,728 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:40:20,729 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:40:20,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:40:20,825 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:40:20,825 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:40:20,825 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [789138568] [2023-11-23 20:40:20,825 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [789138568] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:40:20,826 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:40:20,826 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-11-23 20:40:20,826 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2118762911] [2023-11-23 20:40:20,826 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:40:20,828 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-23 20:40:20,828 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:40:20,829 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-23 20:40:20,830 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 20:40:20,830 INFO L87 Difference]: Start difference. First operand 525 states and 713 transitions. Second operand has 6 states, 6 states have (on average 5.166666666666667) internal successors, (31), 6 states have internal predecessors, (31), 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) [2023-11-23 20:40:21,538 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:40:21,538 INFO L93 Difference]: Finished difference Result 991 states and 1321 transitions. [2023-11-23 20:40:21,540 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-23 20:40:21,540 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 5.166666666666667) internal successors, (31), 6 states have internal predecessors, (31), 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 46 [2023-11-23 20:40:21,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:40:21,567 INFO L225 Difference]: With dead ends: 991 [2023-11-23 20:40:21,567 INFO L226 Difference]: Without dead ends: 814 [2023-11-23 20:40:21,568 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 [2023-11-23 20:40:21,569 INFO L413 NwaCegarLoop]: 285 mSDtfsCounter, 586 mSDsluCounter, 416 mSDsCounter, 0 mSdLazyCounter, 542 mSolverCounterSat, 234 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 592 SdHoareTripleChecker+Valid, 701 SdHoareTripleChecker+Invalid, 776 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 234 IncrementalHoareTripleChecker+Valid, 542 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-23 20:40:21,570 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [592 Valid, 701 Invalid, 776 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [234 Valid, 542 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-23 20:40:21,572 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 814 states. [2023-11-23 20:40:21,657 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 814 to 789. [2023-11-23 20:40:21,659 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 789 states, 554 states have (on average 1.2924187725631768) internal successors, (716), 562 states have internal predecessors, (716), 148 states have call successors, (148), 87 states have call predecessors, (148), 85 states have return successors, (183), 141 states have call predecessors, (183), 144 states have call successors, (183) [2023-11-23 20:40:21,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 789 states to 789 states and 1047 transitions. [2023-11-23 20:40:21,666 INFO L78 Accepts]: Start accepts. Automaton has 789 states and 1047 transitions. Word has length 46 [2023-11-23 20:40:21,666 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:40:21,666 INFO L495 AbstractCegarLoop]: Abstraction has 789 states and 1047 transitions. [2023-11-23 20:40:21,666 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 5.166666666666667) internal successors, (31), 6 states have internal predecessors, (31), 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) [2023-11-23 20:40:21,667 INFO L276 IsEmpty]: Start isEmpty. Operand 789 states and 1047 transitions. [2023-11-23 20:40:21,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2023-11-23 20:40:21,668 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:40:21,668 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] [2023-11-23 20:40:21,668 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-23 20:40:21,669 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:40:21,669 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:40:21,669 INFO L85 PathProgramCache]: Analyzing trace with hash -373489586, now seen corresponding path program 1 times [2023-11-23 20:40:21,669 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:40:21,670 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [77646877] [2023-11-23 20:40:21,670 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:40:21,670 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:40:21,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:40:21,719 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:40:21,720 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:40:21,720 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [77646877] [2023-11-23 20:40:21,720 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [77646877] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:40:21,720 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:40:21,720 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-23 20:40:21,721 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1289678955] [2023-11-23 20:40:21,721 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:40:21,721 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 20:40:21,721 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:40:21,722 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 20:40:21,722 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 20:40:21,723 INFO L87 Difference]: Start difference. First operand 789 states and 1047 transitions. Second operand has 3 states, 3 states have (on average 11.666666666666666) internal successors, (35), 3 states have internal predecessors, (35), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-23 20:40:21,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:40:21,840 INFO L93 Difference]: Finished difference Result 790 states and 1048 transitions. [2023-11-23 20:40:21,841 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 20:40:21,841 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 11.666666666666666) internal successors, (35), 3 states have internal predecessors, (35), 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 50 [2023-11-23 20:40:21,841 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:40:21,844 INFO L225 Difference]: With dead ends: 790 [2023-11-23 20:40:21,844 INFO L226 Difference]: Without dead ends: 346 [2023-11-23 20:40:21,846 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 20:40:21,847 INFO L413 NwaCegarLoop]: 168 mSDtfsCounter, 185 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 185 SdHoareTripleChecker+Valid, 168 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 20:40:21,847 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [185 Valid, 168 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 20:40:21,848 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 346 states. [2023-11-23 20:40:21,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 346 to 346. [2023-11-23 20:40:21,888 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 346 states, 252 states have (on average 1.3650793650793651) internal successors, (344), 257 states have internal predecessors, (344), 63 states have call successors, (63), 31 states have call predecessors, (63), 30 states have return successors, (83), 58 states have call predecessors, (83), 61 states have call successors, (83) [2023-11-23 20:40:21,891 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 346 states to 346 states and 490 transitions. [2023-11-23 20:40:21,892 INFO L78 Accepts]: Start accepts. Automaton has 346 states and 490 transitions. Word has length 50 [2023-11-23 20:40:21,892 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:40:21,892 INFO L495 AbstractCegarLoop]: Abstraction has 346 states and 490 transitions. [2023-11-23 20:40:21,892 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 11.666666666666666) internal successors, (35), 3 states have internal predecessors, (35), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-23 20:40:21,892 INFO L276 IsEmpty]: Start isEmpty. Operand 346 states and 490 transitions. [2023-11-23 20:40:21,894 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2023-11-23 20:40:21,894 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:40:21,894 INFO L195 NwaCegarLoop]: trace histogram [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] [2023-11-23 20:40:21,895 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-11-23 20:40:21,895 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:40:21,895 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:40:21,895 INFO L85 PathProgramCache]: Analyzing trace with hash 2141062717, now seen corresponding path program 1 times [2023-11-23 20:40:21,896 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:40:21,896 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1614375220] [2023-11-23 20:40:21,896 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:40:21,896 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:40:21,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:40:22,278 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2023-11-23 20:40:22,278 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:40:22,278 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1614375220] [2023-11-23 20:40:22,279 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1614375220] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:40:22,279 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:40:22,279 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-11-23 20:40:22,279 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1194220794] [2023-11-23 20:40:22,279 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:40:22,280 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-23 20:40:22,280 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:40:22,280 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-23 20:40:22,281 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-23 20:40:22,281 INFO L87 Difference]: Start difference. First operand 346 states and 490 transitions. Second operand has 6 states, 6 states have (on average 6.666666666666667) internal successors, (40), 6 states have internal predecessors, (40), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2023-11-23 20:40:22,590 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:40:22,590 INFO L93 Difference]: Finished difference Result 895 states and 1279 transitions. [2023-11-23 20:40:22,591 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-23 20:40:22,591 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 6.666666666666667) internal successors, (40), 6 states have internal predecessors, (40), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 68 [2023-11-23 20:40:22,591 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:40:22,595 INFO L225 Difference]: With dead ends: 895 [2023-11-23 20:40:22,596 INFO L226 Difference]: Without dead ends: 556 [2023-11-23 20:40:22,597 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2023-11-23 20:40:22,598 INFO L413 NwaCegarLoop]: 126 mSDtfsCounter, 228 mSDsluCounter, 172 mSDsCounter, 0 mSdLazyCounter, 167 mSolverCounterSat, 65 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 235 SdHoareTripleChecker+Valid, 298 SdHoareTripleChecker+Invalid, 232 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 65 IncrementalHoareTripleChecker+Valid, 167 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-23 20:40:22,599 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [235 Valid, 298 Invalid, 232 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [65 Valid, 167 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-23 20:40:22,600 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 556 states. [2023-11-23 20:40:22,693 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 556 to 534. [2023-11-23 20:40:22,695 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 534 states, 389 states have (on average 1.3470437017994858) internal successors, (524), 396 states have internal predecessors, (524), 96 states have call successors, (96), 49 states have call predecessors, (96), 48 states have return successors, (131), 89 states have call predecessors, (131), 94 states have call successors, (131) [2023-11-23 20:40:22,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 534 states to 534 states and 751 transitions. [2023-11-23 20:40:22,700 INFO L78 Accepts]: Start accepts. Automaton has 534 states and 751 transitions. Word has length 68 [2023-11-23 20:40:22,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:40:22,701 INFO L495 AbstractCegarLoop]: Abstraction has 534 states and 751 transitions. [2023-11-23 20:40:22,701 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 6.666666666666667) internal successors, (40), 6 states have internal predecessors, (40), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2023-11-23 20:40:22,701 INFO L276 IsEmpty]: Start isEmpty. Operand 534 states and 751 transitions. [2023-11-23 20:40:22,703 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2023-11-23 20:40:22,704 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:40:22,704 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:40:22,704 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-11-23 20:40:22,704 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:40:22,705 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:40:22,705 INFO L85 PathProgramCache]: Analyzing trace with hash -1363365352, now seen corresponding path program 1 times [2023-11-23 20:40:22,705 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:40:22,705 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2026073937] [2023-11-23 20:40:22,706 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:40:22,706 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:40:22,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:40:23,010 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2023-11-23 20:40:23,011 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:40:23,011 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2026073937] [2023-11-23 20:40:23,011 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2026073937] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:40:23,011 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:40:23,011 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-11-23 20:40:23,012 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2135995742] [2023-11-23 20:40:23,012 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:40:23,012 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-23 20:40:23,012 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:40:23,013 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-23 20:40:23,013 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-23 20:40:23,013 INFO L87 Difference]: Start difference. First operand 534 states and 751 transitions. Second operand has 6 states, 6 states have (on average 7.0) internal successors, (42), 6 states have internal predecessors, (42), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2023-11-23 20:40:23,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:40:23,374 INFO L93 Difference]: Finished difference Result 1580 states and 2247 transitions. [2023-11-23 20:40:23,375 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-23 20:40:23,375 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 7.0) internal successors, (42), 6 states have internal predecessors, (42), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 70 [2023-11-23 20:40:23,376 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:40:23,383 INFO L225 Difference]: With dead ends: 1580 [2023-11-23 20:40:23,383 INFO L226 Difference]: Without dead ends: 1053 [2023-11-23 20:40:23,385 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2023-11-23 20:40:23,387 INFO L413 NwaCegarLoop]: 103 mSDtfsCounter, 236 mSDsluCounter, 149 mSDsCounter, 0 mSdLazyCounter, 142 mSolverCounterSat, 85 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 247 SdHoareTripleChecker+Valid, 252 SdHoareTripleChecker+Invalid, 227 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 85 IncrementalHoareTripleChecker+Valid, 142 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-23 20:40:23,387 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [247 Valid, 252 Invalid, 227 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [85 Valid, 142 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-23 20:40:23,389 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1053 states. [2023-11-23 20:40:23,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1053 to 1009. [2023-11-23 20:40:23,514 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1009 states, 734 states have (on average 1.32425068119891) internal successors, (972), 746 states have internal predecessors, (972), 178 states have call successors, (178), 97 states have call predecessors, (178), 96 states have return successors, (243), 166 states have call predecessors, (243), 176 states have call successors, (243) [2023-11-23 20:40:23,522 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1009 states to 1009 states and 1393 transitions. [2023-11-23 20:40:23,523 INFO L78 Accepts]: Start accepts. Automaton has 1009 states and 1393 transitions. Word has length 70 [2023-11-23 20:40:23,526 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:40:23,526 INFO L495 AbstractCegarLoop]: Abstraction has 1009 states and 1393 transitions. [2023-11-23 20:40:23,526 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 7.0) internal successors, (42), 6 states have internal predecessors, (42), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2023-11-23 20:40:23,527 INFO L276 IsEmpty]: Start isEmpty. Operand 1009 states and 1393 transitions. [2023-11-23 20:40:23,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2023-11-23 20:40:23,530 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:40:23,530 INFO L195 NwaCegarLoop]: trace histogram [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] [2023-11-23 20:40:23,530 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2023-11-23 20:40:23,530 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:40:23,531 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:40:23,531 INFO L85 PathProgramCache]: Analyzing trace with hash -2017983107, now seen corresponding path program 1 times [2023-11-23 20:40:23,531 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:40:23,531 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [398575955] [2023-11-23 20:40:23,531 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:40:23,532 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:40:23,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:40:23,624 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2023-11-23 20:40:23,624 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:40:23,624 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [398575955] [2023-11-23 20:40:23,625 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [398575955] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:40:23,625 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:40:23,625 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-23 20:40:23,626 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1638684914] [2023-11-23 20:40:23,626 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:40:23,626 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 20:40:23,626 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:40:23,627 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 20:40:23,627 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 20:40:23,627 INFO L87 Difference]: Start difference. First operand 1009 states and 1393 transitions. Second operand has 3 states, 3 states have (on average 14.666666666666666) internal successors, (44), 3 states have internal predecessors, (44), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2023-11-23 20:40:23,832 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:40:23,832 INFO L93 Difference]: Finished difference Result 2102 states and 2930 transitions. [2023-11-23 20:40:23,833 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 20:40:23,833 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 14.666666666666666) internal successors, (44), 3 states have internal predecessors, (44), 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 72 [2023-11-23 20:40:23,834 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:40:23,842 INFO L225 Difference]: With dead ends: 2102 [2023-11-23 20:40:23,842 INFO L226 Difference]: Without dead ends: 1224 [2023-11-23 20:40:23,848 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 20:40:23,849 INFO L413 NwaCegarLoop]: 139 mSDtfsCounter, 36 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 236 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 20:40:23,853 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [36 Valid, 236 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 20:40:23,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1224 states. [2023-11-23 20:40:23,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1224 to 1107. [2023-11-23 20:40:23,972 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1107 states, 820 states have (on average 1.329268292682927) internal successors, (1090), 832 states have internal predecessors, (1090), 184 states have call successors, (184), 103 states have call predecessors, (184), 102 states have return successors, (249), 172 states have call predecessors, (249), 182 states have call successors, (249) [2023-11-23 20:40:23,981 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1107 states to 1107 states and 1523 transitions. [2023-11-23 20:40:23,981 INFO L78 Accepts]: Start accepts. Automaton has 1107 states and 1523 transitions. Word has length 72 [2023-11-23 20:40:23,982 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:40:23,982 INFO L495 AbstractCegarLoop]: Abstraction has 1107 states and 1523 transitions. [2023-11-23 20:40:23,982 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 14.666666666666666) internal successors, (44), 3 states have internal predecessors, (44), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2023-11-23 20:40:23,983 INFO L276 IsEmpty]: Start isEmpty. Operand 1107 states and 1523 transitions. [2023-11-23 20:40:23,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2023-11-23 20:40:23,991 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:40:23,991 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:40:23,991 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2023-11-23 20:40:23,992 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:40:23,992 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:40:23,992 INFO L85 PathProgramCache]: Analyzing trace with hash 119197756, now seen corresponding path program 1 times [2023-11-23 20:40:23,992 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:40:23,994 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [475439234] [2023-11-23 20:40:23,994 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:40:23,995 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:40:24,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:40:24,104 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-11-23 20:40:24,104 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:40:24,105 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [475439234] [2023-11-23 20:40:24,105 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [475439234] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:40:24,105 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:40:24,105 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-23 20:40:24,105 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1065370715] [2023-11-23 20:40:24,106 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:40:24,107 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 20:40:24,107 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:40:24,108 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 20:40:24,108 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 20:40:24,108 INFO L87 Difference]: Start difference. First operand 1107 states and 1523 transitions. Second operand has 3 states, 3 states have (on average 16.666666666666668) internal successors, (50), 3 states have internal predecessors, (50), 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) [2023-11-23 20:40:24,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:40:24,338 INFO L93 Difference]: Finished difference Result 2755 states and 3839 transitions. [2023-11-23 20:40:24,339 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 20:40:24,339 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 16.666666666666668) internal successors, (50), 3 states have internal predecessors, (50), 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 91 [2023-11-23 20:40:24,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:40:24,350 INFO L225 Difference]: With dead ends: 2755 [2023-11-23 20:40:24,350 INFO L226 Difference]: Without dead ends: 1654 [2023-11-23 20:40:24,354 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 20:40:24,356 INFO L413 NwaCegarLoop]: 110 mSDtfsCounter, 82 mSDsluCounter, 86 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 82 SdHoareTripleChecker+Valid, 196 SdHoareTripleChecker+Invalid, 45 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 20:40:24,357 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [82 Valid, 196 Invalid, 45 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 20:40:24,360 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1654 states. [2023-11-23 20:40:24,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1654 to 1639. [2023-11-23 20:40:24,554 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1639 states, 1216 states have (on average 1.3108552631578947) internal successors, (1594), 1233 states have internal predecessors, (1594), 269 states have call successors, (269), 154 states have call predecessors, (269), 153 states have return successors, (364), 252 states have call predecessors, (364), 267 states have call successors, (364) [2023-11-23 20:40:24,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1639 states to 1639 states and 2227 transitions. [2023-11-23 20:40:24,570 INFO L78 Accepts]: Start accepts. Automaton has 1639 states and 2227 transitions. Word has length 91 [2023-11-23 20:40:24,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:40:24,570 INFO L495 AbstractCegarLoop]: Abstraction has 1639 states and 2227 transitions. [2023-11-23 20:40:24,571 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 16.666666666666668) internal successors, (50), 3 states have internal predecessors, (50), 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) [2023-11-23 20:40:24,571 INFO L276 IsEmpty]: Start isEmpty. Operand 1639 states and 2227 transitions. [2023-11-23 20:40:24,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2023-11-23 20:40:24,579 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:40:24,580 INFO L195 NwaCegarLoop]: trace histogram [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, 1] [2023-11-23 20:40:24,580 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-11-23 20:40:24,580 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:40:24,580 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:40:24,581 INFO L85 PathProgramCache]: Analyzing trace with hash -35526338, now seen corresponding path program 1 times [2023-11-23 20:40:24,581 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:40:24,581 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [97616368] [2023-11-23 20:40:24,581 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:40:24,581 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:40:24,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:40:24,694 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 21 proven. 2 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2023-11-23 20:40:24,694 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:40:24,694 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [97616368] [2023-11-23 20:40:24,694 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [97616368] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:40:24,694 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1048332126] [2023-11-23 20:40:24,695 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:40:24,695 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:40:24,695 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:40:24,700 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:40:24,728 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-23 20:40:24,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:40:24,853 INFO L262 TraceCheckSpWp]: Trace formula consists of 487 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-23 20:40:24,864 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:40:24,955 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 46 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-23 20:40:24,956 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 20:40:24,956 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1048332126] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:40:24,956 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 20:40:24,956 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2023-11-23 20:40:24,956 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2067161213] [2023-11-23 20:40:24,957 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:40:24,957 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 20:40:24,957 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:40:24,958 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 20:40:24,958 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 20:40:24,958 INFO L87 Difference]: Start difference. First operand 1639 states and 2227 transitions. Second operand has 3 states, 3 states have (on average 23.666666666666668) internal successors, (71), 3 states have internal predecessors, (71), 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) [2023-11-23 20:40:25,224 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:40:25,224 INFO L93 Difference]: Finished difference Result 3184 states and 4368 transitions. [2023-11-23 20:40:25,225 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 20:40:25,225 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 23.666666666666668) internal successors, (71), 3 states have internal predecessors, (71), 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 106 [2023-11-23 20:40:25,226 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:40:25,239 INFO L225 Difference]: With dead ends: 3184 [2023-11-23 20:40:25,240 INFO L226 Difference]: Without dead ends: 1980 [2023-11-23 20:40:25,245 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 106 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 20:40:25,246 INFO L413 NwaCegarLoop]: 106 mSDtfsCounter, 80 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 80 SdHoareTripleChecker+Valid, 125 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 20:40:25,247 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [80 Valid, 125 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 20:40:25,250 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1980 states. [2023-11-23 20:40:25,497 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1980 to 1924. [2023-11-23 20:40:25,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1924 states, 1463 states have (on average 1.3000683526999317) internal successors, (1902), 1477 states have internal predecessors, (1902), 275 states have call successors, (275), 184 states have call predecessors, (275), 185 states have return successors, (369), 263 states have call predecessors, (369), 273 states have call successors, (369) [2023-11-23 20:40:25,519 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1924 states to 1924 states and 2546 transitions. [2023-11-23 20:40:25,519 INFO L78 Accepts]: Start accepts. Automaton has 1924 states and 2546 transitions. Word has length 106 [2023-11-23 20:40:25,520 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:40:25,521 INFO L495 AbstractCegarLoop]: Abstraction has 1924 states and 2546 transitions. [2023-11-23 20:40:25,521 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 23.666666666666668) internal successors, (71), 3 states have internal predecessors, (71), 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) [2023-11-23 20:40:25,521 INFO L276 IsEmpty]: Start isEmpty. Operand 1924 states and 2546 transitions. [2023-11-23 20:40:25,527 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2023-11-23 20:40:25,527 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:40:25,529 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:40:25,556 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-23 20:40:25,750 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-11-23 20:40:25,750 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:40:25,751 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:40:25,751 INFO L85 PathProgramCache]: Analyzing trace with hash -2093130369, now seen corresponding path program 1 times [2023-11-23 20:40:25,751 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:40:25,751 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [267048690] [2023-11-23 20:40:25,751 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:40:25,751 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:40:25,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:40:25,866 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 21 proven. 2 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2023-11-23 20:40:25,866 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:40:25,866 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [267048690] [2023-11-23 20:40:25,867 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [267048690] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:40:25,867 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [210638087] [2023-11-23 20:40:25,867 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:40:25,867 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:40:25,867 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:40:25,868 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:40:25,895 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-23 20:40:26,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:40:26,019 INFO L262 TraceCheckSpWp]: Trace formula consists of 484 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-23 20:40:26,024 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:40:26,052 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 52 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-11-23 20:40:26,052 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 20:40:26,052 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [210638087] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:40:26,052 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 20:40:26,052 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2023-11-23 20:40:26,053 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2071870208] [2023-11-23 20:40:26,053 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:40:26,053 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 20:40:26,053 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:40:26,054 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 20:40:26,054 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-23 20:40:26,054 INFO L87 Difference]: Start difference. First operand 1924 states and 2546 transitions. Second operand has 3 states, 3 states have (on average 24.333333333333332) internal successors, (73), 3 states have internal predecessors, (73), 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) [2023-11-23 20:40:26,396 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:40:26,397 INFO L93 Difference]: Finished difference Result 3677 states and 4932 transitions. [2023-11-23 20:40:26,397 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 20:40:26,398 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 24.333333333333332) internal successors, (73), 3 states have internal predecessors, (73), 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 106 [2023-11-23 20:40:26,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:40:26,415 INFO L225 Difference]: With dead ends: 3677 [2023-11-23 20:40:26,415 INFO L226 Difference]: Without dead ends: 2377 [2023-11-23 20:40:26,420 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 106 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-23 20:40:26,421 INFO L413 NwaCegarLoop]: 148 mSDtfsCounter, 61 mSDsluCounter, 99 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 247 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 20:40:26,422 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [61 Valid, 247 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 20:40:26,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2377 states. [2023-11-23 20:40:26,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2377 to 2071. [2023-11-23 20:40:26,690 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2071 states, 1588 states have (on average 1.3073047858942066) internal successors, (2076), 1602 states have internal predecessors, (2076), 286 states have call successors, (286), 195 states have call predecessors, (286), 196 states have return successors, (380), 274 states have call predecessors, (380), 284 states have call successors, (380) [2023-11-23 20:40:26,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2071 states to 2071 states and 2742 transitions. [2023-11-23 20:40:26,704 INFO L78 Accepts]: Start accepts. Automaton has 2071 states and 2742 transitions. Word has length 106 [2023-11-23 20:40:26,704 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:40:26,704 INFO L495 AbstractCegarLoop]: Abstraction has 2071 states and 2742 transitions. [2023-11-23 20:40:26,705 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 24.333333333333332) internal successors, (73), 3 states have internal predecessors, (73), 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) [2023-11-23 20:40:26,705 INFO L276 IsEmpty]: Start isEmpty. Operand 2071 states and 2742 transitions. [2023-11-23 20:40:26,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2023-11-23 20:40:26,713 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:40:26,713 INFO L195 NwaCegarLoop]: trace histogram [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, 1] [2023-11-23 20:40:26,743 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-23 20:40:26,937 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2023-11-23 20:40:26,938 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:40:26,938 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:40:26,938 INFO L85 PathProgramCache]: Analyzing trace with hash 1842440702, now seen corresponding path program 2 times [2023-11-23 20:40:26,938 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:40:26,938 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [301980896] [2023-11-23 20:40:26,939 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:40:26,939 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:40:26,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:40:27,283 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 10 proven. 20 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2023-11-23 20:40:27,283 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:40:27,284 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [301980896] [2023-11-23 20:40:27,284 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [301980896] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:40:27,284 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1555433212] [2023-11-23 20:40:27,284 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-23 20:40:27,285 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:40:27,287 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:40:27,288 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:40:27,301 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-23 20:40:27,448 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-11-23 20:40:27,449 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 20:40:27,451 INFO L262 TraceCheckSpWp]: Trace formula consists of 321 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-23 20:40:27,462 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:40:27,543 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 49 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-23 20:40:27,543 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 20:40:27,543 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1555433212] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:40:27,544 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 20:40:27,544 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 8 [2023-11-23 20:40:27,544 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [670887435] [2023-11-23 20:40:27,544 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:40:27,545 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-23 20:40:27,545 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:40:27,546 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-23 20:40:27,546 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2023-11-23 20:40:27,546 INFO L87 Difference]: Start difference. First operand 2071 states and 2742 transitions. Second operand has 4 states, 4 states have (on average 18.75) internal successors, (75), 4 states have internal predecessors, (75), 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) [2023-11-23 20:40:27,877 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:40:27,877 INFO L93 Difference]: Finished difference Result 3718 states and 4910 transitions. [2023-11-23 20:40:27,878 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-23 20:40:27,878 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 18.75) internal successors, (75), 4 states have internal predecessors, (75), 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 106 [2023-11-23 20:40:27,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:40:27,898 INFO L225 Difference]: With dead ends: 3718 [2023-11-23 20:40:27,898 INFO L226 Difference]: Without dead ends: 2204 [2023-11-23 20:40:27,904 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 107 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2023-11-23 20:40:27,905 INFO L413 NwaCegarLoop]: 157 mSDtfsCounter, 89 mSDsluCounter, 246 mSDsCounter, 0 mSdLazyCounter, 85 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 89 SdHoareTripleChecker+Valid, 403 SdHoareTripleChecker+Invalid, 88 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 85 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 20:40:27,905 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [89 Valid, 403 Invalid, 88 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 85 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 20:40:27,909 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2204 states. [2023-11-23 20:40:28,204 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2204 to 2156. [2023-11-23 20:40:28,212 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2156 states, 1648 states have (on average 1.3021844660194175) internal successors, (2146), 1668 states have internal predecessors, (2146), 294 states have call successors, (294), 200 states have call predecessors, (294), 213 states have return successors, (406), 288 states have call predecessors, (406), 292 states have call successors, (406) [2023-11-23 20:40:28,225 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2156 states to 2156 states and 2846 transitions. [2023-11-23 20:40:28,225 INFO L78 Accepts]: Start accepts. Automaton has 2156 states and 2846 transitions. Word has length 106 [2023-11-23 20:40:28,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:40:28,226 INFO L495 AbstractCegarLoop]: Abstraction has 2156 states and 2846 transitions. [2023-11-23 20:40:28,226 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 18.75) internal successors, (75), 4 states have internal predecessors, (75), 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) [2023-11-23 20:40:28,226 INFO L276 IsEmpty]: Start isEmpty. Operand 2156 states and 2846 transitions. [2023-11-23 20:40:28,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2023-11-23 20:40:28,234 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:40:28,234 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:40:28,262 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-23 20:40:28,448 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2023-11-23 20:40:28,448 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:40:28,449 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:40:28,449 INFO L85 PathProgramCache]: Analyzing trace with hash -1019691875, now seen corresponding path program 2 times [2023-11-23 20:40:28,449 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:40:28,449 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2003025411] [2023-11-23 20:40:28,449 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:40:28,450 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:40:28,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:40:28,691 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 10 proven. 21 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2023-11-23 20:40:28,692 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:40:28,692 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2003025411] [2023-11-23 20:40:28,692 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2003025411] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:40:28,693 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [758825839] [2023-11-23 20:40:28,693 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-23 20:40:28,693 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:40:28,693 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:40:28,694 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:40:28,724 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-23 20:40:28,865 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-11-23 20:40:28,866 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 20:40:28,868 INFO L262 TraceCheckSpWp]: Trace formula consists of 318 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-23 20:40:28,873 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:40:28,907 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 41 proven. 0 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2023-11-23 20:40:28,907 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 20:40:28,907 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [758825839] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:40:28,908 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 20:40:28,908 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-11-23 20:40:28,911 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1239587239] [2023-11-23 20:40:28,912 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:40:28,912 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 20:40:28,912 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:40:28,914 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 20:40:28,914 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-23 20:40:28,914 INFO L87 Difference]: Start difference. First operand 2156 states and 2846 transitions. Second operand has 3 states, 3 states have (on average 22.333333333333332) internal successors, (67), 3 states have internal predecessors, (67), 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) [2023-11-23 20:40:29,234 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:40:29,234 INFO L93 Difference]: Finished difference Result 3647 states and 5005 transitions. [2023-11-23 20:40:29,235 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 20:40:29,235 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 22.333333333333332) internal successors, (67), 3 states have internal predecessors, (67), 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 106 [2023-11-23 20:40:29,236 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:40:29,251 INFO L225 Difference]: With dead ends: 3647 [2023-11-23 20:40:29,252 INFO L226 Difference]: Without dead ends: 2168 [2023-11-23 20:40:29,258 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 108 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-23 20:40:29,259 INFO L413 NwaCegarLoop]: 152 mSDtfsCounter, 93 mSDsluCounter, 88 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 93 SdHoareTripleChecker+Valid, 240 SdHoareTripleChecker+Invalid, 54 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 20:40:29,260 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [93 Valid, 240 Invalid, 54 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 20:40:29,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2168 states. [2023-11-23 20:40:29,621 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2168 to 2150. [2023-11-23 20:40:29,626 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2150 states, 1642 states have (on average 1.269183922046285) internal successors, (2084), 1662 states have internal predecessors, (2084), 294 states have call successors, (294), 200 states have call predecessors, (294), 213 states have return successors, (406), 288 states have call predecessors, (406), 292 states have call successors, (406) [2023-11-23 20:40:29,640 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2150 states to 2150 states and 2784 transitions. [2023-11-23 20:40:29,640 INFO L78 Accepts]: Start accepts. Automaton has 2150 states and 2784 transitions. Word has length 106 [2023-11-23 20:40:29,641 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:40:29,641 INFO L495 AbstractCegarLoop]: Abstraction has 2150 states and 2784 transitions. [2023-11-23 20:40:29,641 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 22.333333333333332) internal successors, (67), 3 states have internal predecessors, (67), 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) [2023-11-23 20:40:29,642 INFO L276 IsEmpty]: Start isEmpty. Operand 2150 states and 2784 transitions. [2023-11-23 20:40:29,650 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2023-11-23 20:40:29,650 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:40:29,651 INFO L195 NwaCegarLoop]: trace histogram [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, 1] [2023-11-23 20:40:29,678 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-23 20:40:29,864 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2023-11-23 20:40:29,865 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:40:29,865 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:40:29,865 INFO L85 PathProgramCache]: Analyzing trace with hash -32827523, now seen corresponding path program 1 times [2023-11-23 20:40:29,866 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:40:29,866 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [684299796] [2023-11-23 20:40:29,866 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:40:29,866 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:40:29,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:40:30,164 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 10 proven. 19 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2023-11-23 20:40:30,164 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:40:30,164 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [684299796] [2023-11-23 20:40:30,165 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [684299796] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:40:30,165 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1598193982] [2023-11-23 20:40:30,165 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:40:30,165 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:40:30,166 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:40:30,167 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:40:30,196 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-23 20:40:30,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:40:30,348 INFO L262 TraceCheckSpWp]: Trace formula consists of 490 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-23 20:40:30,353 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:40:30,400 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 53 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-11-23 20:40:30,401 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 20:40:30,401 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1598193982] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:40:30,401 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 20:40:30,401 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-11-23 20:40:30,402 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [235137311] [2023-11-23 20:40:30,402 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:40:30,403 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 20:40:30,403 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:40:30,404 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 20:40:30,404 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-23 20:40:30,404 INFO L87 Difference]: Start difference. First operand 2150 states and 2784 transitions. Second operand has 3 states, 3 states have (on average 25.666666666666668) internal successors, (77), 3 states have internal predecessors, (77), 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) [2023-11-23 20:40:30,778 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:40:30,778 INFO L93 Difference]: Finished difference Result 4143 states and 5517 transitions. [2023-11-23 20:40:30,779 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 20:40:30,779 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 25.666666666666668) internal successors, (77), 3 states have internal predecessors, (77), 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 106 [2023-11-23 20:40:30,779 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:40:30,797 INFO L225 Difference]: With dead ends: 4143 [2023-11-23 20:40:30,797 INFO L226 Difference]: Without dead ends: 2587 [2023-11-23 20:40:30,802 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 108 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-23 20:40:30,803 INFO L413 NwaCegarLoop]: 157 mSDtfsCounter, 85 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 85 SdHoareTripleChecker+Valid, 244 SdHoareTripleChecker+Invalid, 60 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 20:40:30,804 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [85 Valid, 244 Invalid, 60 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 20:40:30,807 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2587 states. [2023-11-23 20:40:31,108 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2587 to 2523. [2023-11-23 20:40:31,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2523 states, 1941 states have (on average 1.2570839773312725) internal successors, (2440), 1964 states have internal predecessors, (2440), 337 states have call successors, (337), 233 states have call predecessors, (337), 244 states have return successors, (484), 326 states have call predecessors, (484), 335 states have call successors, (484) [2023-11-23 20:40:31,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2523 states to 2523 states and 3261 transitions. [2023-11-23 20:40:31,128 INFO L78 Accepts]: Start accepts. Automaton has 2523 states and 3261 transitions. Word has length 106 [2023-11-23 20:40:31,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:40:31,128 INFO L495 AbstractCegarLoop]: Abstraction has 2523 states and 3261 transitions. [2023-11-23 20:40:31,129 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 25.666666666666668) internal successors, (77), 3 states have internal predecessors, (77), 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) [2023-11-23 20:40:31,129 INFO L276 IsEmpty]: Start isEmpty. Operand 2523 states and 3261 transitions. [2023-11-23 20:40:31,136 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2023-11-23 20:40:31,136 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:40:31,137 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:40:31,166 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-23 20:40:31,352 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2023-11-23 20:40:31,352 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:40:31,353 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:40:31,353 INFO L85 PathProgramCache]: Analyzing trace with hash -2065040315, now seen corresponding path program 1 times [2023-11-23 20:40:31,353 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:40:31,353 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1630720671] [2023-11-23 20:40:31,353 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:40:31,354 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:40:31,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:40:31,648 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 10 proven. 19 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2023-11-23 20:40:31,648 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:40:31,648 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1630720671] [2023-11-23 20:40:31,649 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1630720671] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:40:31,649 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [197610671] [2023-11-23 20:40:31,649 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:40:31,649 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:40:31,650 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:40:31,651 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:40:31,653 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-23 20:40:31,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:40:31,809 INFO L262 TraceCheckSpWp]: Trace formula consists of 494 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-23 20:40:31,812 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:40:31,835 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 47 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-23 20:40:31,836 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 20:40:31,836 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [197610671] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:40:31,836 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 20:40:31,836 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-11-23 20:40:31,837 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [909138304] [2023-11-23 20:40:31,837 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:40:31,838 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 20:40:31,838 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:40:31,838 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 20:40:31,839 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-23 20:40:31,839 INFO L87 Difference]: Start difference. First operand 2523 states and 3261 transitions. Second operand has 3 states, 3 states have (on average 25.0) internal successors, (75), 3 states have internal predecessors, (75), 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) [2023-11-23 20:40:32,168 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:40:32,169 INFO L93 Difference]: Finished difference Result 3602 states and 4688 transitions. [2023-11-23 20:40:32,169 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 20:40:32,170 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 25.0) internal successors, (75), 3 states have internal predecessors, (75), 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 108 [2023-11-23 20:40:32,170 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:40:32,189 INFO L225 Difference]: With dead ends: 3602 [2023-11-23 20:40:32,189 INFO L226 Difference]: Without dead ends: 2456 [2023-11-23 20:40:32,194 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 110 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-23 20:40:32,195 INFO L413 NwaCegarLoop]: 107 mSDtfsCounter, 16 mSDsluCounter, 93 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 200 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 20:40:32,196 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 200 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 20:40:32,200 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2456 states. [2023-11-23 20:40:32,494 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2456 to 2456. [2023-11-23 20:40:32,501 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2456 states, 1886 states have (on average 1.2560975609756098) internal successors, (2369), 1906 states have internal predecessors, (2369), 337 states have call successors, (337), 233 states have call predecessors, (337), 232 states have return successors, (466), 317 states have call predecessors, (466), 335 states have call successors, (466) [2023-11-23 20:40:32,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2456 states to 2456 states and 3172 transitions. [2023-11-23 20:40:32,513 INFO L78 Accepts]: Start accepts. Automaton has 2456 states and 3172 transitions. Word has length 108 [2023-11-23 20:40:32,514 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:40:32,514 INFO L495 AbstractCegarLoop]: Abstraction has 2456 states and 3172 transitions. [2023-11-23 20:40:32,514 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 25.0) internal successors, (75), 3 states have internal predecessors, (75), 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) [2023-11-23 20:40:32,514 INFO L276 IsEmpty]: Start isEmpty. Operand 2456 states and 3172 transitions. [2023-11-23 20:40:32,522 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2023-11-23 20:40:32,522 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:40:32,523 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:40:32,552 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-23 20:40:32,736 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2023-11-23 20:40:32,736 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:40:32,737 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:40:32,737 INFO L85 PathProgramCache]: Analyzing trace with hash 1355217734, now seen corresponding path program 1 times [2023-11-23 20:40:32,737 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:40:32,737 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [829635271] [2023-11-23 20:40:32,737 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:40:32,737 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:40:32,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:40:33,003 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 10 proven. 19 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2023-11-23 20:40:33,004 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:40:33,004 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [829635271] [2023-11-23 20:40:33,004 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [829635271] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:40:33,004 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [560407861] [2023-11-23 20:40:33,004 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:40:33,005 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:40:33,005 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:40:33,006 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:40:33,021 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-23 20:40:33,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:40:33,165 INFO L262 TraceCheckSpWp]: Trace formula consists of 498 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-23 20:40:33,168 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:40:33,200 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 48 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-23 20:40:33,200 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 20:40:33,201 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [560407861] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:40:33,201 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 20:40:33,201 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-11-23 20:40:33,201 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [358578438] [2023-11-23 20:40:33,202 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:40:33,202 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 20:40:33,202 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:40:33,203 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 20:40:33,203 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-23 20:40:33,203 INFO L87 Difference]: Start difference. First operand 2456 states and 3172 transitions. Second operand has 3 states, 3 states have (on average 25.666666666666668) internal successors, (77), 3 states have internal predecessors, (77), 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) [2023-11-23 20:40:33,644 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:40:33,644 INFO L93 Difference]: Finished difference Result 5778 states and 7493 transitions. [2023-11-23 20:40:33,645 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 20:40:33,645 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 25.666666666666668) internal successors, (77), 3 states have internal predecessors, (77), 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 109 [2023-11-23 20:40:33,645 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:40:33,671 INFO L225 Difference]: With dead ends: 5778 [2023-11-23 20:40:33,671 INFO L226 Difference]: Without dead ends: 3368 [2023-11-23 20:40:33,681 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 111 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-23 20:40:33,682 INFO L413 NwaCegarLoop]: 116 mSDtfsCounter, 49 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 194 SdHoareTripleChecker+Invalid, 45 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 20:40:33,683 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [49 Valid, 194 Invalid, 45 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 20:40:33,689 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3368 states. [2023-11-23 20:40:34,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3368 to 2731. [2023-11-23 20:40:34,220 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2731 states, 2119 states have (on average 1.2595563945257198) internal successors, (2669), 2140 states have internal predecessors, (2669), 358 states have call successors, (358), 254 states have call predecessors, (358), 253 states have return successors, (487), 337 states have call predecessors, (487), 356 states have call successors, (487) [2023-11-23 20:40:34,244 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2731 states to 2731 states and 3514 transitions. [2023-11-23 20:40:34,246 INFO L78 Accepts]: Start accepts. Automaton has 2731 states and 3514 transitions. Word has length 109 [2023-11-23 20:40:34,246 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:40:34,246 INFO L495 AbstractCegarLoop]: Abstraction has 2731 states and 3514 transitions. [2023-11-23 20:40:34,247 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 25.666666666666668) internal successors, (77), 3 states have internal predecessors, (77), 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) [2023-11-23 20:40:34,248 INFO L276 IsEmpty]: Start isEmpty. Operand 2731 states and 3514 transitions. [2023-11-23 20:40:34,259 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2023-11-23 20:40:34,259 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:40:34,259 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:40:34,294 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-23 20:40:34,484 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2023-11-23 20:40:34,485 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:40:34,485 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:40:34,486 INFO L85 PathProgramCache]: Analyzing trace with hash -258261041, now seen corresponding path program 1 times [2023-11-23 20:40:34,486 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:40:34,486 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [57440214] [2023-11-23 20:40:34,486 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:40:34,486 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:40:34,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:40:34,727 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 26 proven. 11 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2023-11-23 20:40:34,727 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:40:34,728 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [57440214] [2023-11-23 20:40:34,728 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [57440214] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:40:34,728 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [517563060] [2023-11-23 20:40:34,728 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:40:34,729 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:40:34,729 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:40:34,731 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:40:34,738 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-23 20:40:34,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:40:34,903 INFO L262 TraceCheckSpWp]: Trace formula consists of 504 conjuncts, 6 conjunts are in the unsatisfiable core [2023-11-23 20:40:34,907 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:40:34,973 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 54 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-23 20:40:34,973 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 20:40:34,974 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [517563060] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:40:34,974 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 20:40:34,974 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 6 [2023-11-23 20:40:34,975 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1408018496] [2023-11-23 20:40:34,976 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:40:34,976 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 20:40:34,977 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:40:34,977 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 20:40:34,978 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 20:40:34,978 INFO L87 Difference]: Start difference. First operand 2731 states and 3514 transitions. Second operand has 3 states, 3 states have (on average 27.0) internal successors, (81), 3 states have internal predecessors, (81), 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) [2023-11-23 20:40:35,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:40:35,396 INFO L93 Difference]: Finished difference Result 4980 states and 6557 transitions. [2023-11-23 20:40:35,397 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 20:40:35,397 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.0) internal successors, (81), 3 states have internal predecessors, (81), 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 111 [2023-11-23 20:40:35,397 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:40:35,432 INFO L225 Difference]: With dead ends: 4980 [2023-11-23 20:40:35,432 INFO L226 Difference]: Without dead ends: 3113 [2023-11-23 20:40:35,439 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 113 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 20:40:35,440 INFO L413 NwaCegarLoop]: 114 mSDtfsCounter, 72 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 140 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 20:40:35,440 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [72 Valid, 140 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 20:40:35,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3113 states. [2023-11-23 20:40:35,827 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3113 to 3069. [2023-11-23 20:40:35,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3069 states, 2425 states have (on average 1.2342268041237114) internal successors, (2993), 2446 states have internal predecessors, (2993), 360 states have call successors, (360), 284 states have call predecessors, (360), 283 states have return successors, (535), 339 states have call predecessors, (535), 358 states have call successors, (535) [2023-11-23 20:40:35,845 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3069 states to 3069 states and 3888 transitions. [2023-11-23 20:40:35,846 INFO L78 Accepts]: Start accepts. Automaton has 3069 states and 3888 transitions. Word has length 111 [2023-11-23 20:40:35,846 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:40:35,846 INFO L495 AbstractCegarLoop]: Abstraction has 3069 states and 3888 transitions. [2023-11-23 20:40:35,846 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.0) internal successors, (81), 3 states have internal predecessors, (81), 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) [2023-11-23 20:40:35,847 INFO L276 IsEmpty]: Start isEmpty. Operand 3069 states and 3888 transitions. [2023-11-23 20:40:35,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2023-11-23 20:40:35,855 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:40:35,855 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:40:35,891 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-11-23 20:40:36,064 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:40:36,064 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:40:36,065 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:40:36,065 INFO L85 PathProgramCache]: Analyzing trace with hash -1293900556, now seen corresponding path program 1 times [2023-11-23 20:40:36,065 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:40:36,065 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1908716617] [2023-11-23 20:40:36,066 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:40:36,066 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:40:36,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:40:36,199 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 22 proven. 1 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2023-11-23 20:40:36,200 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:40:36,200 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1908716617] [2023-11-23 20:40:36,200 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1908716617] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:40:36,200 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1605972619] [2023-11-23 20:40:36,201 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:40:36,201 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:40:36,201 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:40:36,202 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:40:36,231 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-11-23 20:40:36,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:40:36,376 INFO L262 TraceCheckSpWp]: Trace formula consists of 489 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-23 20:40:36,381 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:40:36,413 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 50 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-11-23 20:40:36,414 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 20:40:36,414 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1605972619] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:40:36,414 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 20:40:36,415 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2023-11-23 20:40:36,415 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [237536055] [2023-11-23 20:40:36,415 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:40:36,416 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 20:40:36,416 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:40:36,417 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 20:40:36,417 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-23 20:40:36,417 INFO L87 Difference]: Start difference. First operand 3069 states and 3888 transitions. Second operand has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 states have internal predecessors, (74), 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) [2023-11-23 20:40:36,876 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:40:36,876 INFO L93 Difference]: Finished difference Result 4807 states and 6065 transitions. [2023-11-23 20:40:36,877 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 20:40:36,877 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 states have internal predecessors, (74), 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 107 [2023-11-23 20:40:36,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:40:36,897 INFO L225 Difference]: With dead ends: 4807 [2023-11-23 20:40:36,898 INFO L226 Difference]: Without dead ends: 3478 [2023-11-23 20:40:36,902 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 107 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-23 20:40:36,903 INFO L413 NwaCegarLoop]: 140 mSDtfsCounter, 49 mSDsluCounter, 99 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 239 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 20:40:36,903 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [49 Valid, 239 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 20:40:36,909 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3478 states. [2023-11-23 20:40:37,306 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3478 to 3257. [2023-11-23 20:40:37,311 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3257 states, 2581 states have (on average 1.2371173963580007) internal successors, (3193), 2602 states have internal predecessors, (3193), 376 states have call successors, (376), 300 states have call predecessors, (376), 299 states have return successors, (551), 355 states have call predecessors, (551), 374 states have call successors, (551) [2023-11-23 20:40:37,324 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3257 states to 3257 states and 4120 transitions. [2023-11-23 20:40:37,324 INFO L78 Accepts]: Start accepts. Automaton has 3257 states and 4120 transitions. Word has length 107 [2023-11-23 20:40:37,324 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:40:37,325 INFO L495 AbstractCegarLoop]: Abstraction has 3257 states and 4120 transitions. [2023-11-23 20:40:37,325 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 states have internal predecessors, (74), 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) [2023-11-23 20:40:37,325 INFO L276 IsEmpty]: Start isEmpty. Operand 3257 states and 4120 transitions. [2023-11-23 20:40:37,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2023-11-23 20:40:37,333 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:40:37,333 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:40:37,361 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-11-23 20:40:37,546 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2023-11-23 20:40:37,547 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:40:37,547 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:40:37,547 INFO L85 PathProgramCache]: Analyzing trace with hash 613350791, now seen corresponding path program 1 times [2023-11-23 20:40:37,548 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:40:37,548 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1058223534] [2023-11-23 20:40:37,548 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:40:37,548 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:40:37,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:40:38,306 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 13 proven. 34 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2023-11-23 20:40:38,306 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:40:38,306 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1058223534] [2023-11-23 20:40:38,307 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1058223534] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:40:38,307 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1940817064] [2023-11-23 20:40:38,307 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:40:38,307 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:40:38,308 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:40:38,309 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:40:38,346 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-11-23 20:40:38,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:40:38,557 INFO L262 TraceCheckSpWp]: Trace formula consists of 539 conjuncts, 8 conjunts are in the unsatisfiable core [2023-11-23 20:40:38,561 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:40:38,735 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 56 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2023-11-23 20:40:38,736 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 20:40:38,736 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1940817064] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:40:38,736 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 20:40:38,736 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [13] total 18 [2023-11-23 20:40:38,737 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [372163595] [2023-11-23 20:40:38,737 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:40:38,737 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-23 20:40:38,738 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:40:38,738 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-23 20:40:38,739 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2023-11-23 20:40:38,739 INFO L87 Difference]: Start difference. First operand 3257 states and 4120 transitions. Second operand has 7 states, 6 states have (on average 11.666666666666666) internal successors, (70), 6 states have internal predecessors, (70), 3 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) [2023-11-23 20:40:39,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:40:39,460 INFO L93 Difference]: Finished difference Result 6276 states and 8028 transitions. [2023-11-23 20:40:39,460 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-23 20:40:39,460 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 11.666666666666666) internal successors, (70), 6 states have internal predecessors, (70), 3 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) Word has length 113 [2023-11-23 20:40:39,461 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:40:39,489 INFO L225 Difference]: With dead ends: 6276 [2023-11-23 20:40:39,492 INFO L226 Difference]: Without dead ends: 3412 [2023-11-23 20:40:39,500 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 117 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=80, Invalid=382, Unknown=0, NotChecked=0, Total=462 [2023-11-23 20:40:39,501 INFO L413 NwaCegarLoop]: 160 mSDtfsCounter, 107 mSDsluCounter, 667 mSDsCounter, 0 mSdLazyCounter, 250 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 110 SdHoareTripleChecker+Valid, 827 SdHoareTripleChecker+Invalid, 253 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 250 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-23 20:40:39,502 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [110 Valid, 827 Invalid, 253 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 250 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-23 20:40:39,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3412 states. [2023-11-23 20:40:39,942 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3412 to 2939. [2023-11-23 20:40:39,946 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2939 states, 2331 states have (on average 1.2303732303732304) internal successors, (2868), 2347 states have internal predecessors, (2868), 338 states have call successors, (338), 270 states have call predecessors, (338), 269 states have return successors, (483), 322 states have call predecessors, (483), 336 states have call successors, (483) [2023-11-23 20:40:39,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2939 states to 2939 states and 3689 transitions. [2023-11-23 20:40:39,959 INFO L78 Accepts]: Start accepts. Automaton has 2939 states and 3689 transitions. Word has length 113 [2023-11-23 20:40:39,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:40:39,960 INFO L495 AbstractCegarLoop]: Abstraction has 2939 states and 3689 transitions. [2023-11-23 20:40:39,960 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 11.666666666666666) internal successors, (70), 6 states have internal predecessors, (70), 3 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) [2023-11-23 20:40:39,960 INFO L276 IsEmpty]: Start isEmpty. Operand 2939 states and 3689 transitions. [2023-11-23 20:40:39,967 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2023-11-23 20:40:39,967 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:40:39,968 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:40:40,003 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2023-11-23 20:40:40,180 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:40:40,181 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:40:40,181 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:40:40,181 INFO L85 PathProgramCache]: Analyzing trace with hash 687073329, now seen corresponding path program 1 times [2023-11-23 20:40:40,181 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:40:40,181 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1757803208] [2023-11-23 20:40:40,181 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:40:40,182 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:40:40,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:40:40,416 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 36 proven. 4 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2023-11-23 20:40:40,417 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:40:40,417 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1757803208] [2023-11-23 20:40:40,417 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1757803208] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:40:40,417 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1597499625] [2023-11-23 20:40:40,418 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:40:40,418 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:40:40,418 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:40:40,420 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:40:40,440 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-11-23 20:40:40,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:40:40,581 INFO L262 TraceCheckSpWp]: Trace formula consists of 494 conjuncts, 6 conjunts are in the unsatisfiable core [2023-11-23 20:40:40,585 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:40:40,708 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 59 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-11-23 20:40:40,708 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 20:40:40,708 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1597499625] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:40:40,709 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 20:40:40,709 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 7 [2023-11-23 20:40:40,709 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [956023312] [2023-11-23 20:40:40,709 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:40:40,710 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-23 20:40:40,710 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:40:40,711 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-23 20:40:40,711 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2023-11-23 20:40:40,711 INFO L87 Difference]: Start difference. First operand 2939 states and 3689 transitions. Second operand has 4 states, 4 states have (on average 20.25) internal successors, (81), 4 states have internal predecessors, (81), 4 states have call successors, (11), 4 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 4 states have call successors, (10) [2023-11-23 20:40:41,202 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:40:41,203 INFO L93 Difference]: Finished difference Result 6185 states and 7814 transitions. [2023-11-23 20:40:41,203 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-23 20:40:41,203 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 20.25) internal successors, (81), 4 states have internal predecessors, (81), 4 states have call successors, (11), 4 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 4 states have call successors, (10) Word has length 109 [2023-11-23 20:40:41,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:40:41,223 INFO L225 Difference]: With dead ends: 6185 [2023-11-23 20:40:41,223 INFO L226 Difference]: Without dead ends: 3696 [2023-11-23 20:40:41,233 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 109 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2023-11-23 20:40:41,234 INFO L413 NwaCegarLoop]: 158 mSDtfsCounter, 128 mSDsluCounter, 104 mSDsCounter, 0 mSdLazyCounter, 92 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 128 SdHoareTripleChecker+Valid, 262 SdHoareTripleChecker+Invalid, 97 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 92 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 20:40:41,235 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [128 Valid, 262 Invalid, 97 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 92 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 20:40:41,241 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3696 states. [2023-11-23 20:40:41,709 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3696 to 3305. [2023-11-23 20:40:41,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3305 states, 2655 states have (on average 1.2131826741996234) internal successors, (3221), 2678 states have internal predecessors, (3221), 349 states have call successors, (349), 297 states have call predecessors, (349), 300 states have return successors, (505), 330 states have call predecessors, (505), 347 states have call successors, (505) [2023-11-23 20:40:41,725 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3305 states to 3305 states and 4075 transitions. [2023-11-23 20:40:41,726 INFO L78 Accepts]: Start accepts. Automaton has 3305 states and 4075 transitions. Word has length 109 [2023-11-23 20:40:41,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:40:41,727 INFO L495 AbstractCegarLoop]: Abstraction has 3305 states and 4075 transitions. [2023-11-23 20:40:41,727 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 20.25) internal successors, (81), 4 states have internal predecessors, (81), 4 states have call successors, (11), 4 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 4 states have call successors, (10) [2023-11-23 20:40:41,727 INFO L276 IsEmpty]: Start isEmpty. Operand 3305 states and 4075 transitions. [2023-11-23 20:40:41,734 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2023-11-23 20:40:41,735 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:40:41,735 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:40:41,770 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2023-11-23 20:40:41,948 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:40:41,948 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:40:41,949 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:40:41,949 INFO L85 PathProgramCache]: Analyzing trace with hash 1457449421, now seen corresponding path program 1 times [2023-11-23 20:40:41,949 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:40:41,949 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1488045670] [2023-11-23 20:40:41,949 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:40:41,950 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:40:41,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:40:42,191 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 47 proven. 0 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2023-11-23 20:40:42,191 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:40:42,191 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1488045670] [2023-11-23 20:40:42,192 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1488045670] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:40:42,192 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:40:42,192 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-23 20:40:42,192 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1426182216] [2023-11-23 20:40:42,192 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:40:42,193 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-23 20:40:42,193 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:40:42,194 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-23 20:40:42,194 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-23 20:40:42,194 INFO L87 Difference]: Start difference. First operand 3305 states and 4075 transitions. Second operand has 5 states, 5 states have (on average 14.6) internal successors, (73), 5 states have internal predecessors, (73), 4 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2023-11-23 20:40:43,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:40:43,147 INFO L93 Difference]: Finished difference Result 8106 states and 10031 transitions. [2023-11-23 20:40:43,148 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-23 20:40:43,148 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 14.6) internal successors, (73), 5 states have internal predecessors, (73), 4 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 110 [2023-11-23 20:40:43,149 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:40:43,167 INFO L225 Difference]: With dead ends: 8106 [2023-11-23 20:40:43,167 INFO L226 Difference]: Without dead ends: 4246 [2023-11-23 20:40:43,177 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2023-11-23 20:40:43,178 INFO L413 NwaCegarLoop]: 140 mSDtfsCounter, 68 mSDsluCounter, 244 mSDsCounter, 0 mSdLazyCounter, 234 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 384 SdHoareTripleChecker+Invalid, 258 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 234 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-23 20:40:43,179 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [73 Valid, 384 Invalid, 258 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 234 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-23 20:40:43,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4246 states. [2023-11-23 20:40:43,739 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4246 to 4120. [2023-11-23 20:40:43,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4120 states, 3271 states have (on average 1.1974931213696118) internal successors, (3917), 3304 states have internal predecessors, (3917), 455 states have call successors, (455), 383 states have call predecessors, (455), 393 states have return successors, (674), 433 states have call predecessors, (674), 453 states have call successors, (674) [2023-11-23 20:40:43,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4120 states to 4120 states and 5046 transitions. [2023-11-23 20:40:43,759 INFO L78 Accepts]: Start accepts. Automaton has 4120 states and 5046 transitions. Word has length 110 [2023-11-23 20:40:43,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:40:43,762 INFO L495 AbstractCegarLoop]: Abstraction has 4120 states and 5046 transitions. [2023-11-23 20:40:43,762 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 14.6) internal successors, (73), 5 states have internal predecessors, (73), 4 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2023-11-23 20:40:43,763 INFO L276 IsEmpty]: Start isEmpty. Operand 4120 states and 5046 transitions. [2023-11-23 20:40:43,770 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2023-11-23 20:40:43,770 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:40:43,770 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:40:43,771 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2023-11-23 20:40:43,771 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:40:43,771 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:40:43,772 INFO L85 PathProgramCache]: Analyzing trace with hash 637671356, now seen corresponding path program 1 times [2023-11-23 20:40:43,772 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:40:43,772 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1421985211] [2023-11-23 20:40:43,772 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:40:43,772 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:40:43,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:40:43,997 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 39 proven. 14 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-11-23 20:40:43,998 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:40:43,998 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1421985211] [2023-11-23 20:40:43,998 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1421985211] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:40:43,998 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [647230200] [2023-11-23 20:40:43,999 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:40:43,999 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:40:43,999 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:40:44,001 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:40:44,035 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-11-23 20:40:44,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:40:44,176 INFO L262 TraceCheckSpWp]: Trace formula consists of 493 conjuncts, 22 conjunts are in the unsatisfiable core [2023-11-23 20:40:44,180 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:40:44,253 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 69 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:40:44,253 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 20:40:44,253 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [647230200] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:40:44,253 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 20:40:44,254 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [5] total 6 [2023-11-23 20:40:44,254 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1418162824] [2023-11-23 20:40:44,254 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:40:44,255 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-23 20:40:44,255 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:40:44,255 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-23 20:40:44,256 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-23 20:40:44,256 INFO L87 Difference]: Start difference. First operand 4120 states and 5046 transitions. Second operand has 6 states, 6 states have (on average 14.5) internal successors, (87), 6 states have internal predecessors, (87), 5 states have call successors, (12), 5 states have call predecessors, (12), 5 states have return successors, (11), 5 states have call predecessors, (11), 5 states have call successors, (11) [2023-11-23 20:40:45,157 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:40:45,157 INFO L93 Difference]: Finished difference Result 8735 states and 10830 transitions. [2023-11-23 20:40:45,158 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-23 20:40:45,158 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 14.5) internal successors, (87), 6 states have internal predecessors, (87), 5 states have call successors, (12), 5 states have call predecessors, (12), 5 states have return successors, (11), 5 states have call predecessors, (11), 5 states have call successors, (11) Word has length 110 [2023-11-23 20:40:45,158 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:40:45,181 INFO L225 Difference]: With dead ends: 8735 [2023-11-23 20:40:45,181 INFO L226 Difference]: Without dead ends: 5471 [2023-11-23 20:40:45,192 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 117 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2023-11-23 20:40:45,193 INFO L413 NwaCegarLoop]: 148 mSDtfsCounter, 189 mSDsluCounter, 176 mSDsCounter, 0 mSdLazyCounter, 194 mSolverCounterSat, 45 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 203 SdHoareTripleChecker+Valid, 324 SdHoareTripleChecker+Invalid, 239 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 194 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-23 20:40:45,193 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [203 Valid, 324 Invalid, 239 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 194 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-23 20:40:45,202 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5471 states. [2023-11-23 20:40:46,076 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5471 to 5178. [2023-11-23 20:40:46,084 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5178 states, 4096 states have (on average 1.191650390625) internal successors, (4881), 4135 states have internal predecessors, (4881), 586 states have call successors, (586), 488 states have call predecessors, (586), 495 states have return successors, (908), 555 states have call predecessors, (908), 584 states have call successors, (908) [2023-11-23 20:40:46,111 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5178 states to 5178 states and 6375 transitions. [2023-11-23 20:40:46,111 INFO L78 Accepts]: Start accepts. Automaton has 5178 states and 6375 transitions. Word has length 110 [2023-11-23 20:40:46,112 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:40:46,112 INFO L495 AbstractCegarLoop]: Abstraction has 5178 states and 6375 transitions. [2023-11-23 20:40:46,113 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 14.5) internal successors, (87), 6 states have internal predecessors, (87), 5 states have call successors, (12), 5 states have call predecessors, (12), 5 states have return successors, (11), 5 states have call predecessors, (11), 5 states have call successors, (11) [2023-11-23 20:40:46,113 INFO L276 IsEmpty]: Start isEmpty. Operand 5178 states and 6375 transitions. [2023-11-23 20:40:46,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2023-11-23 20:40:46,122 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:40:46,122 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:40:46,152 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2023-11-23 20:40:46,351 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2023-11-23 20:40:46,352 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:40:46,352 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:40:46,352 INFO L85 PathProgramCache]: Analyzing trace with hash -1072939452, now seen corresponding path program 1 times [2023-11-23 20:40:46,353 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:40:46,353 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1526773155] [2023-11-23 20:40:46,353 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:40:46,353 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:40:46,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:40:47,194 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 13 proven. 34 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2023-11-23 20:40:47,194 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:40:47,195 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1526773155] [2023-11-23 20:40:47,195 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1526773155] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:40:47,195 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1588519826] [2023-11-23 20:40:47,195 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:40:47,196 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:40:47,196 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:40:47,201 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:40:47,224 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-11-23 20:40:47,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:40:47,382 INFO L262 TraceCheckSpWp]: Trace formula consists of 548 conjuncts, 9 conjunts are in the unsatisfiable core [2023-11-23 20:40:47,385 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:40:47,527 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 56 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2023-11-23 20:40:47,527 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 20:40:47,527 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1588519826] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:40:47,527 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 20:40:47,528 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [13] total 19 [2023-11-23 20:40:47,528 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2054005758] [2023-11-23 20:40:47,528 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:40:47,529 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-23 20:40:47,529 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:40:47,530 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-23 20:40:47,530 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=289, Unknown=0, NotChecked=0, Total=342 [2023-11-23 20:40:47,531 INFO L87 Difference]: Start difference. First operand 5178 states and 6375 transitions. Second operand has 8 states, 7 states have (on average 10.428571428571429) internal successors, (73), 7 states have internal predecessors, (73), 3 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) [2023-11-23 20:40:48,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:40:48,379 INFO L93 Difference]: Finished difference Result 8110 states and 9897 transitions. [2023-11-23 20:40:48,384 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-11-23 20:40:48,385 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 10.428571428571429) internal successors, (73), 7 states have internal predecessors, (73), 3 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) Word has length 116 [2023-11-23 20:40:48,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:40:48,406 INFO L225 Difference]: With dead ends: 8110 [2023-11-23 20:40:48,406 INFO L226 Difference]: Without dead ends: 5338 [2023-11-23 20:40:48,416 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 119 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 113 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=89, Invalid=417, Unknown=0, NotChecked=0, Total=506 [2023-11-23 20:40:48,417 INFO L413 NwaCegarLoop]: 162 mSDtfsCounter, 96 mSDsluCounter, 580 mSDsCounter, 0 mSdLazyCounter, 260 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 98 SdHoareTripleChecker+Valid, 742 SdHoareTripleChecker+Invalid, 269 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 260 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-23 20:40:48,418 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [98 Valid, 742 Invalid, 269 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 260 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-23 20:40:48,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5338 states. [2023-11-23 20:40:49,017 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5338 to 5219. [2023-11-23 20:40:49,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5219 states, 4131 states have (on average 1.1914790607601065) internal successors, (4922), 4170 states have internal predecessors, (4922), 589 states have call successors, (589), 491 states have call predecessors, (589), 498 states have return successors, (911), 558 states have call predecessors, (911), 587 states have call successors, (911) [2023-11-23 20:40:49,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5219 states to 5219 states and 6422 transitions. [2023-11-23 20:40:49,038 INFO L78 Accepts]: Start accepts. Automaton has 5219 states and 6422 transitions. Word has length 116 [2023-11-23 20:40:49,039 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:40:49,039 INFO L495 AbstractCegarLoop]: Abstraction has 5219 states and 6422 transitions. [2023-11-23 20:40:49,039 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 10.428571428571429) internal successors, (73), 7 states have internal predecessors, (73), 3 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) [2023-11-23 20:40:49,039 INFO L276 IsEmpty]: Start isEmpty. Operand 5219 states and 6422 transitions. [2023-11-23 20:40:49,047 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2023-11-23 20:40:49,047 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:40:49,047 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:40:49,074 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2023-11-23 20:40:49,274 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2023-11-23 20:40:49,274 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:40:49,274 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:40:49,275 INFO L85 PathProgramCache]: Analyzing trace with hash -931566664, now seen corresponding path program 1 times [2023-11-23 20:40:49,275 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:40:49,275 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1735695784] [2023-11-23 20:40:49,275 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:40:49,275 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:40:49,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:40:50,113 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 21 proven. 26 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-11-23 20:40:50,114 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:40:50,114 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1735695784] [2023-11-23 20:40:50,114 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1735695784] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:40:50,114 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1154578963] [2023-11-23 20:40:50,115 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:40:50,115 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:40:50,115 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:40:50,116 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:40:50,120 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2023-11-23 20:40:50,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:40:50,298 INFO L262 TraceCheckSpWp]: Trace formula consists of 558 conjuncts, 27 conjunts are in the unsatisfiable core [2023-11-23 20:40:50,303 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:40:50,847 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 54 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2023-11-23 20:40:50,848 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 20:40:50,848 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1154578963] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:40:50,848 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 20:40:50,849 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [18] total 25 [2023-11-23 20:40:50,849 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [38525009] [2023-11-23 20:40:50,849 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:40:50,850 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-23 20:40:50,850 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:40:50,851 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-23 20:40:50,851 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=538, Unknown=0, NotChecked=0, Total=600 [2023-11-23 20:40:50,852 INFO L87 Difference]: Start difference. First operand 5219 states and 6422 transitions. Second operand has 9 states, 6 states have (on average 12.5) internal successors, (75), 6 states have internal predecessors, (75), 3 states have call successors, (16), 5 states have call predecessors, (16), 6 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) [2023-11-23 20:40:51,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:40:51,905 INFO L93 Difference]: Finished difference Result 8310 states and 10121 transitions. [2023-11-23 20:40:51,905 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-11-23 20:40:51,905 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 6 states have (on average 12.5) internal successors, (75), 6 states have internal predecessors, (75), 3 states have call successors, (16), 5 states have call predecessors, (16), 6 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) Word has length 118 [2023-11-23 20:40:51,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:40:51,919 INFO L225 Difference]: With dead ends: 8310 [2023-11-23 20:40:51,920 INFO L226 Difference]: Without dead ends: 3938 [2023-11-23 20:40:51,932 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 115 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 173 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=124, Invalid=868, Unknown=0, NotChecked=0, Total=992 [2023-11-23 20:40:51,933 INFO L413 NwaCegarLoop]: 79 mSDtfsCounter, 273 mSDsluCounter, 314 mSDsCounter, 0 mSdLazyCounter, 443 mSolverCounterSat, 126 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 287 SdHoareTripleChecker+Valid, 393 SdHoareTripleChecker+Invalid, 569 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 126 IncrementalHoareTripleChecker+Valid, 443 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-23 20:40:51,934 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [287 Valid, 393 Invalid, 569 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [126 Valid, 443 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-23 20:40:51,940 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3938 states. [2023-11-23 20:40:52,390 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3938 to 3016. [2023-11-23 20:40:52,399 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3016 states, 2362 states have (on average 1.1591871295512277) internal successors, (2738), 2377 states have internal predecessors, (2738), 358 states have call successors, (358), 290 states have call predecessors, (358), 295 states have return successors, (434), 349 states have call predecessors, (434), 356 states have call successors, (434) [2023-11-23 20:40:52,406 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3016 states to 3016 states and 3530 transitions. [2023-11-23 20:40:52,407 INFO L78 Accepts]: Start accepts. Automaton has 3016 states and 3530 transitions. Word has length 118 [2023-11-23 20:40:52,407 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:40:52,408 INFO L495 AbstractCegarLoop]: Abstraction has 3016 states and 3530 transitions. [2023-11-23 20:40:52,408 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 6 states have (on average 12.5) internal successors, (75), 6 states have internal predecessors, (75), 3 states have call successors, (16), 5 states have call predecessors, (16), 6 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) [2023-11-23 20:40:52,408 INFO L276 IsEmpty]: Start isEmpty. Operand 3016 states and 3530 transitions. [2023-11-23 20:40:52,412 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2023-11-23 20:40:52,413 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:40:52,413 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:40:52,439 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2023-11-23 20:40:52,634 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2023-11-23 20:40:52,634 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:40:52,635 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:40:52,635 INFO L85 PathProgramCache]: Analyzing trace with hash 1867881106, now seen corresponding path program 1 times [2023-11-23 20:40:52,635 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:40:52,635 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1346777452] [2023-11-23 20:40:52,635 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:40:52,635 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:40:52,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:40:53,360 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 22 proven. 27 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-11-23 20:40:53,361 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:40:53,361 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1346777452] [2023-11-23 20:40:53,361 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1346777452] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:40:53,361 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1521560819] [2023-11-23 20:40:53,362 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:40:53,362 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:40:53,362 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:40:53,363 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:40:53,384 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2023-11-23 20:40:53,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:40:53,528 INFO L262 TraceCheckSpWp]: Trace formula consists of 557 conjuncts, 27 conjunts are in the unsatisfiable core [2023-11-23 20:40:53,531 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:40:53,863 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 56 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2023-11-23 20:40:53,864 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 20:40:53,864 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1521560819] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:40:53,864 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 20:40:53,864 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [18] total 22 [2023-11-23 20:40:53,865 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [922638772] [2023-11-23 20:40:53,865 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:40:53,865 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-23 20:40:53,866 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:40:53,866 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-23 20:40:53,867 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=399, Unknown=0, NotChecked=0, Total=462 [2023-11-23 20:40:53,867 INFO L87 Difference]: Start difference. First operand 3016 states and 3530 transitions. Second operand has 9 states, 6 states have (on average 12.666666666666666) internal successors, (76), 6 states have internal predecessors, (76), 3 states have call successors, (16), 5 states have call predecessors, (16), 6 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) [2023-11-23 20:40:55,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:40:55,095 INFO L93 Difference]: Finished difference Result 6371 states and 7438 transitions. [2023-11-23 20:40:55,096 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-11-23 20:40:55,096 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 6 states have (on average 12.666666666666666) internal successors, (76), 6 states have internal predecessors, (76), 3 states have call successors, (16), 5 states have call predecessors, (16), 6 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) Word has length 119 [2023-11-23 20:40:55,096 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:40:55,110 INFO L225 Difference]: With dead ends: 6371 [2023-11-23 20:40:55,110 INFO L226 Difference]: Without dead ends: 3844 [2023-11-23 20:40:55,122 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 119 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 145 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=149, Invalid=663, Unknown=0, NotChecked=0, Total=812 [2023-11-23 20:40:55,124 INFO L413 NwaCegarLoop]: 64 mSDtfsCounter, 380 mSDsluCounter, 215 mSDsCounter, 0 mSdLazyCounter, 367 mSolverCounterSat, 160 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 396 SdHoareTripleChecker+Valid, 279 SdHoareTripleChecker+Invalid, 527 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 160 IncrementalHoareTripleChecker+Valid, 367 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-23 20:40:55,125 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [396 Valid, 279 Invalid, 527 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [160 Valid, 367 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-23 20:40:55,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3844 states. [2023-11-23 20:40:55,658 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3844 to 3205. [2023-11-23 20:40:55,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3205 states, 2505 states have (on average 1.1528942115768464) internal successors, (2888), 2520 states have internal predecessors, (2888), 382 states have call successors, (382), 310 states have call predecessors, (382), 317 states have return successors, (438), 375 states have call predecessors, (438), 380 states have call successors, (438) [2023-11-23 20:40:55,675 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3205 states to 3205 states and 3708 transitions. [2023-11-23 20:40:55,675 INFO L78 Accepts]: Start accepts. Automaton has 3205 states and 3708 transitions. Word has length 119 [2023-11-23 20:40:55,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:40:55,676 INFO L495 AbstractCegarLoop]: Abstraction has 3205 states and 3708 transitions. [2023-11-23 20:40:55,676 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 6 states have (on average 12.666666666666666) internal successors, (76), 6 states have internal predecessors, (76), 3 states have call successors, (16), 5 states have call predecessors, (16), 6 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) [2023-11-23 20:40:55,677 INFO L276 IsEmpty]: Start isEmpty. Operand 3205 states and 3708 transitions. [2023-11-23 20:40:55,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2023-11-23 20:40:55,682 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:40:55,682 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:40:55,714 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2023-11-23 20:40:55,908 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed402fb9-1411-43d5-848f-b42658c3bde9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:40:55,908 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:40:55,909 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:40:55,909 INFO L85 PathProgramCache]: Analyzing trace with hash -999989288, now seen corresponding path program 1 times [2023-11-23 20:40:55,909 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:40:55,909 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [54490820] [2023-11-23 20:40:55,909 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:40:55,910 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:40:55,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:40:56,215 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 24 proven. 0 refuted. 0 times theorem prover too weak. 85 trivial. 0 not checked. [2023-11-23 20:40:56,215 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:40:56,216 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [54490820] [2023-11-23 20:40:56,216 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [54490820] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:40:56,216 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:40:56,216 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-23 20:40:56,217 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1909629479] [2023-11-23 20:40:56,217 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:40:56,218 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-23 20:40:56,218 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:40:56,219 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-23 20:40:56,219 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-23 20:40:56,219 INFO L87 Difference]: Start difference. First operand 3205 states and 3708 transitions. Second operand has 5 states, 5 states have (on average 14.6) internal successors, (73), 5 states have internal predecessors, (73), 5 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10)