./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/Problem05_label43+token_ring.06.cil-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 0e0057cc Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/Problem05_label43+token_ring.06.cil-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 653a8e34239233d69d9a38d78b85981ab63654836b879da54ad0b88422f00ccf --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-12-02 15:54:48,270 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-12-02 15:54:48,339 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-12-02 15:54:48,345 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-12-02 15:54:48,346 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-12-02 15:54:48,372 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-12-02 15:54:48,373 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-12-02 15:54:48,373 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-12-02 15:54:48,374 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-12-02 15:54:48,375 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-12-02 15:54:48,375 INFO L153 SettingsManager]: * User list type=DISABLED [2023-12-02 15:54:48,376 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-12-02 15:54:48,376 INFO L153 SettingsManager]: * Explicit value domain=true [2023-12-02 15:54:48,377 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-12-02 15:54:48,377 INFO L153 SettingsManager]: * Octagon Domain=false [2023-12-02 15:54:48,378 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-12-02 15:54:48,378 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-12-02 15:54:48,379 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-12-02 15:54:48,379 INFO L153 SettingsManager]: * Interval Domain=false [2023-12-02 15:54:48,380 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-12-02 15:54:48,381 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-12-02 15:54:48,385 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-12-02 15:54:48,386 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-12-02 15:54:48,386 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-12-02 15:54:48,386 INFO L153 SettingsManager]: * sizeof long=4 [2023-12-02 15:54:48,387 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-12-02 15:54:48,387 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-12-02 15:54:48,388 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-12-02 15:54:48,388 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-12-02 15:54:48,388 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-12-02 15:54:48,389 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-12-02 15:54:48,389 INFO L153 SettingsManager]: * sizeof long double=12 [2023-12-02 15:54:48,389 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-12-02 15:54:48,390 INFO L153 SettingsManager]: * Use constant arrays=true [2023-12-02 15:54:48,390 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-12-02 15:54:48,390 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-12-02 15:54:48,390 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-12-02 15:54:48,391 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 15:54:48,391 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-12-02 15:54:48,391 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-12-02 15:54:48,391 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-12-02 15:54:48,392 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-12-02 15:54:48,392 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-12-02 15:54:48,392 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-12-02 15:54:48,393 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-12-02 15:54:48,393 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-12-02 15:54:48,393 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-12-02 15:54:48,393 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_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 653a8e34239233d69d9a38d78b85981ab63654836b879da54ad0b88422f00ccf [2023-12-02 15:54:48,632 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-12-02 15:54:48,654 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-12-02 15:54:48,656 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-12-02 15:54:48,658 INFO L270 PluginConnector]: Initializing CDTParser... [2023-12-02 15:54:48,658 INFO L274 PluginConnector]: CDTParser initialized [2023-12-02 15:54:48,660 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/../../sv-benchmarks/c/combinations/Problem05_label43+token_ring.06.cil-1.c [2023-12-02 15:54:51,576 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-12-02 15:54:52,161 INFO L384 CDTParser]: Found 1 translation units. [2023-12-02 15:54:52,162 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/sv-benchmarks/c/combinations/Problem05_label43+token_ring.06.cil-1.c [2023-12-02 15:54:52,216 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/data/49c82a956/e8b2a9c3fce24ed9a942109540b9a2ba/FLAGc292d5b38 [2023-12-02 15:54:52,232 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/data/49c82a956/e8b2a9c3fce24ed9a942109540b9a2ba [2023-12-02 15:54:52,235 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-12-02 15:54:52,236 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-12-02 15:54:52,238 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-12-02 15:54:52,238 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-12-02 15:54:52,244 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-12-02 15:54:52,244 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 03:54:52" (1/1) ... [2023-12-02 15:54:52,246 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@57ee3d5b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:54:52, skipping insertion in model container [2023-12-02 15:54:52,246 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 03:54:52" (1/1) ... [2023-12-02 15:54:52,553 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-12-02 15:54:54,421 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_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/sv-benchmarks/c/combinations/Problem05_label43+token_ring.06.cil-1.c[381679,381692] [2023-12-02 15:54:54,446 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_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/sv-benchmarks/c/combinations/Problem05_label43+token_ring.06.cil-1.c[383339,383352] [2023-12-02 15:54:54,667 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 15:54:54,677 INFO L202 MainTranslator]: Completed pre-run [2023-12-02 15:54:55,616 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_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/sv-benchmarks/c/combinations/Problem05_label43+token_ring.06.cil-1.c[381679,381692] [2023-12-02 15:54:55,619 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_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/sv-benchmarks/c/combinations/Problem05_label43+token_ring.06.cil-1.c[383339,383352] [2023-12-02 15:54:55,639 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 15:54:55,698 INFO L206 MainTranslator]: Completed translation [2023-12-02 15:54:55,698 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:54:55 WrapperNode [2023-12-02 15:54:55,699 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-12-02 15:54:55,700 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-12-02 15:54:55,700 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-12-02 15:54:55,700 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-12-02 15:54:55,706 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:54:55" (1/1) ... [2023-12-02 15:54:55,772 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:54:55" (1/1) ... [2023-12-02 15:54:56,035 INFO L138 Inliner]: procedures = 56, calls = 60, calls flagged for inlining = 33, calls inlined = 33, statements flattened = 12874 [2023-12-02 15:54:56,036 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-12-02 15:54:56,036 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-12-02 15:54:56,036 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-12-02 15:54:56,036 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-12-02 15:54:56,044 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:54:55" (1/1) ... [2023-12-02 15:54:56,044 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:54:55" (1/1) ... [2023-12-02 15:54:56,080 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:54:55" (1/1) ... [2023-12-02 15:54:56,081 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:54:55" (1/1) ... [2023-12-02 15:54:56,311 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:54:55" (1/1) ... [2023-12-02 15:54:56,360 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:54:55" (1/1) ... [2023-12-02 15:54:56,381 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:54:55" (1/1) ... [2023-12-02 15:54:56,400 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:54:55" (1/1) ... [2023-12-02 15:54:56,447 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-12-02 15:54:56,448 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-12-02 15:54:56,448 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-12-02 15:54:56,448 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-12-02 15:54:56,449 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:54:55" (1/1) ... [2023-12-02 15:54:56,455 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 15:54:56,466 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:54:56,478 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-12-02 15:54:56,481 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-12-02 15:54:56,573 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-12-02 15:54:56,573 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2023-12-02 15:54:56,574 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2023-12-02 15:54:56,574 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2023-12-02 15:54:56,574 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2023-12-02 15:54:56,574 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2023-12-02 15:54:56,574 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2023-12-02 15:54:56,574 INFO L130 BoogieDeclarations]: Found specification of procedure error [2023-12-02 15:54:56,574 INFO L138 BoogieDeclarations]: Found implementation of procedure error [2023-12-02 15:54:56,574 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2023-12-02 15:54:56,575 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2023-12-02 15:54:56,575 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2023-12-02 15:54:56,575 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2023-12-02 15:54:56,575 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2023-12-02 15:54:56,575 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2023-12-02 15:54:56,575 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-12-02 15:54:56,575 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-12-02 15:54:56,576 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-12-02 15:54:56,698 INFO L241 CfgBuilder]: Building ICFG [2023-12-02 15:54:56,701 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-12-02 15:55:04,845 INFO L282 CfgBuilder]: Performing block encoding [2023-12-02 15:55:06,756 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-12-02 15:55:06,756 INFO L309 CfgBuilder]: Removed 10 assume(true) statements. [2023-12-02 15:55:06,758 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 03:55:06 BoogieIcfgContainer [2023-12-02 15:55:06,759 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-12-02 15:55:06,762 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-12-02 15:55:06,762 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-12-02 15:55:06,766 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-12-02 15:55:06,766 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.12 03:54:52" (1/3) ... [2023-12-02 15:55:06,767 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7d1744b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 03:55:06, skipping insertion in model container [2023-12-02 15:55:06,767 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:54:55" (2/3) ... [2023-12-02 15:55:06,767 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7d1744b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 03:55:06, skipping insertion in model container [2023-12-02 15:55:06,767 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 03:55:06" (3/3) ... [2023-12-02 15:55:06,769 INFO L112 eAbstractionObserver]: Analyzing ICFG Problem05_label43+token_ring.06.cil-1.c [2023-12-02 15:55:06,790 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-12-02 15:55:06,790 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2023-12-02 15:55:06,881 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-12-02 15:55:06,887 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;@4e4aab29, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-12-02 15:55:06,887 INFO L358 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2023-12-02 15:55:06,900 INFO L276 IsEmpty]: Start isEmpty. Operand has 1778 states, 1746 states have (on average 1.9644902634593355) internal successors, (3430), 1751 states have internal predecessors, (3430), 22 states have call successors, (22), 7 states have call predecessors, (22), 7 states have return successors, (22), 21 states have call predecessors, (22), 22 states have call successors, (22) [2023-12-02 15:55:06,909 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2023-12-02 15:55:06,910 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:55:06,910 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 15:55:06,911 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:55:06,915 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:55:06,915 INFO L85 PathProgramCache]: Analyzing trace with hash 75406392, now seen corresponding path program 1 times [2023-12-02 15:55:06,925 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:55:06,926 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1137163616] [2023-12-02 15:55:06,926 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:55:06,927 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:55:07,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:55:07,309 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 15:55:07,310 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:55:07,310 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1137163616] [2023-12-02 15:55:07,311 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1137163616] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:55:07,311 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 15:55:07,312 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-12-02 15:55:07,314 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1744284105] [2023-12-02 15:55:07,314 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:55:07,319 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 15:55:07,319 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:55:07,350 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 15:55:07,351 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 15:55:07,359 INFO L87 Difference]: Start difference. First operand has 1778 states, 1746 states have (on average 1.9644902634593355) internal successors, (3430), 1751 states have internal predecessors, (3430), 22 states have call successors, (22), 7 states have call predecessors, (22), 7 states have return successors, (22), 21 states have call predecessors, (22), 22 states have call successors, (22) Second operand has 4 states, 4 states have (on average 9.75) internal successors, (39), 4 states have internal predecessors, (39), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2023-12-02 15:55:08,269 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:55:08,270 INFO L93 Difference]: Finished difference Result 3667 states and 7132 transitions. [2023-12-02 15:55:08,272 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 15:55:08,274 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 9.75) internal successors, (39), 4 states have internal predecessors, (39), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 50 [2023-12-02 15:55:08,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:55:08,299 INFO L225 Difference]: With dead ends: 3667 [2023-12-02 15:55:08,299 INFO L226 Difference]: Without dead ends: 1888 [2023-12-02 15:55:08,308 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 15:55:08,311 INFO L413 NwaCegarLoop]: 3352 mSDtfsCounter, 3603 mSDsluCounter, 3276 mSDsCounter, 0 mSdLazyCounter, 634 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3603 SdHoareTripleChecker+Valid, 6628 SdHoareTripleChecker+Invalid, 648 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 634 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-12-02 15:55:08,312 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3603 Valid, 6628 Invalid, 648 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [14 Valid, 634 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-12-02 15:55:08,334 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1888 states. [2023-12-02 15:55:08,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1888 to 1887. [2023-12-02 15:55:08,436 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1887 states, 1835 states have (on average 1.9335149863760217) internal successors, (3548), 1839 states have internal predecessors, (3548), 38 states have call successors, (38), 13 states have call predecessors, (38), 12 states have return successors, (36), 35 states have call predecessors, (36), 36 states have call successors, (36) [2023-12-02 15:55:08,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1887 states to 1887 states and 3622 transitions. [2023-12-02 15:55:08,451 INFO L78 Accepts]: Start accepts. Automaton has 1887 states and 3622 transitions. Word has length 50 [2023-12-02 15:55:08,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:55:08,452 INFO L495 AbstractCegarLoop]: Abstraction has 1887 states and 3622 transitions. [2023-12-02 15:55:08,452 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 9.75) internal successors, (39), 4 states have internal predecessors, (39), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2023-12-02 15:55:08,453 INFO L276 IsEmpty]: Start isEmpty. Operand 1887 states and 3622 transitions. [2023-12-02 15:55:08,460 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2023-12-02 15:55:08,460 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:55:08,460 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 15:55:08,461 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-12-02 15:55:08,461 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:55:08,462 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:55:08,462 INFO L85 PathProgramCache]: Analyzing trace with hash 1047646348, now seen corresponding path program 1 times [2023-12-02 15:55:08,462 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:55:08,463 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [866159332] [2023-12-02 15:55:08,463 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:55:08,463 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:55:08,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:55:08,676 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-12-02 15:55:08,676 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:55:08,677 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [866159332] [2023-12-02 15:55:08,677 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [866159332] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:55:08,678 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [284815109] [2023-12-02 15:55:08,678 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:55:08,678 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:55:08,678 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:55:08,679 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:55:08,689 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-12-02 15:55:08,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:55:08,882 INFO L262 TraceCheckSpWp]: Trace formula consists of 628 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 15:55:08,892 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:55:08,955 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-12-02 15:55:08,955 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 15:55:08,956 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [284815109] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:55:08,956 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 15:55:08,956 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-12-02 15:55:08,957 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [398241379] [2023-12-02 15:55:08,957 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:55:08,958 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 15:55:08,958 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:55:08,959 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 15:55:08,959 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 15:55:08,960 INFO L87 Difference]: Start difference. First operand 1887 states and 3622 transitions. Second operand has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 2 states have internal predecessors, (62), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-12-02 15:55:09,471 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:55:09,472 INFO L93 Difference]: Finished difference Result 2362 states and 4321 transitions. [2023-12-02 15:55:09,472 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 15:55:09,472 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 2 states have internal predecessors, (62), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 96 [2023-12-02 15:55:09,473 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:55:09,491 INFO L225 Difference]: With dead ends: 2362 [2023-12-02 15:55:09,491 INFO L226 Difference]: Without dead ends: 2121 [2023-12-02 15:55:09,493 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 96 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 15:55:09,495 INFO L413 NwaCegarLoop]: 3261 mSDtfsCounter, 3432 mSDsluCounter, 149 mSDsCounter, 0 mSdLazyCounter, 283 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3432 SdHoareTripleChecker+Valid, 3410 SdHoareTripleChecker+Invalid, 285 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 283 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 15:55:09,496 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3432 Valid, 3410 Invalid, 285 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 283 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 15:55:09,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2121 states. [2023-12-02 15:55:09,565 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2121 to 2115. [2023-12-02 15:55:09,572 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2115 states, 2021 states have (on average 1.8866897575457695) internal successors, (3813), 2026 states have internal predecessors, (3813), 68 states have call successors, (68), 25 states have call predecessors, (68), 24 states have return successors, (66), 64 states have call predecessors, (66), 66 states have call successors, (66) [2023-12-02 15:55:09,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2115 states to 2115 states and 3947 transitions. [2023-12-02 15:55:09,587 INFO L78 Accepts]: Start accepts. Automaton has 2115 states and 3947 transitions. Word has length 96 [2023-12-02 15:55:09,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:55:09,588 INFO L495 AbstractCegarLoop]: Abstraction has 2115 states and 3947 transitions. [2023-12-02 15:55:09,588 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 2 states have internal predecessors, (62), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-12-02 15:55:09,588 INFO L276 IsEmpty]: Start isEmpty. Operand 2115 states and 3947 transitions. [2023-12-02 15:55:09,594 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2023-12-02 15:55:09,594 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:55:09,594 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 15:55:09,602 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-12-02 15:55:09,800 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:55:09,801 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:55:09,801 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:55:09,802 INFO L85 PathProgramCache]: Analyzing trace with hash -2042943124, now seen corresponding path program 1 times [2023-12-02 15:55:09,802 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:55:09,802 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1811712009] [2023-12-02 15:55:09,802 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:55:09,803 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:55:09,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:55:10,039 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-12-02 15:55:10,040 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:55:10,040 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1811712009] [2023-12-02 15:55:10,040 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1811712009] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:55:10,041 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [312898598] [2023-12-02 15:55:10,041 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:55:10,041 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:55:10,041 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:55:10,045 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:55:10,049 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-12-02 15:55:10,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:55:10,204 INFO L262 TraceCheckSpWp]: Trace formula consists of 622 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 15:55:10,209 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:55:10,259 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-12-02 15:55:10,259 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 15:55:10,260 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [312898598] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:55:10,260 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 15:55:10,260 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-12-02 15:55:10,260 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1165359944] [2023-12-02 15:55:10,260 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:55:10,261 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 15:55:10,261 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:55:10,262 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 15:55:10,262 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 15:55:10,262 INFO L87 Difference]: Start difference. First operand 2115 states and 3947 transitions. Second operand has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 2 states have internal predecessors, (68), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-12-02 15:55:10,779 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:55:10,780 INFO L93 Difference]: Finished difference Result 3040 states and 5302 transitions. [2023-12-02 15:55:10,780 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 15:55:10,781 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 2 states have internal predecessors, (68), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 96 [2023-12-02 15:55:10,781 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:55:10,801 INFO L225 Difference]: With dead ends: 3040 [2023-12-02 15:55:10,801 INFO L226 Difference]: Without dead ends: 2571 [2023-12-02 15:55:10,804 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 96 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 15:55:10,806 INFO L413 NwaCegarLoop]: 3213 mSDtfsCounter, 3426 mSDsluCounter, 149 mSDsCounter, 0 mSdLazyCounter, 279 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3426 SdHoareTripleChecker+Valid, 3362 SdHoareTripleChecker+Invalid, 281 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 279 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 15:55:10,807 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3426 Valid, 3362 Invalid, 281 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 279 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 15:55:10,813 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2571 states. [2023-12-02 15:55:10,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2571 to 2563. [2023-12-02 15:55:10,908 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2563 states, 2387 states have (on average 1.8144113950565564) internal successors, (4331), 2394 states have internal predecessors, (4331), 126 states have call successors, (126), 49 states have call predecessors, (126), 48 states have return successors, (124), 120 states have call predecessors, (124), 124 states have call successors, (124) [2023-12-02 15:55:10,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2563 states to 2563 states and 4581 transitions. [2023-12-02 15:55:10,927 INFO L78 Accepts]: Start accepts. Automaton has 2563 states and 4581 transitions. Word has length 96 [2023-12-02 15:55:10,927 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:55:10,928 INFO L495 AbstractCegarLoop]: Abstraction has 2563 states and 4581 transitions. [2023-12-02 15:55:10,928 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 2 states have internal predecessors, (68), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-12-02 15:55:10,928 INFO L276 IsEmpty]: Start isEmpty. Operand 2563 states and 4581 transitions. [2023-12-02 15:55:10,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2023-12-02 15:55:10,933 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:55:10,933 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 15:55:10,940 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-12-02 15:55:11,133 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:55:11,134 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:55:11,134 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:55:11,134 INFO L85 PathProgramCache]: Analyzing trace with hash 1387309644, now seen corresponding path program 1 times [2023-12-02 15:55:11,135 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:55:11,135 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1628120932] [2023-12-02 15:55:11,135 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:55:11,135 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:55:11,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:55:11,250 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-12-02 15:55:11,251 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:55:11,251 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1628120932] [2023-12-02 15:55:11,251 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1628120932] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:55:11,251 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1193543819] [2023-12-02 15:55:11,251 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:55:11,252 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:55:11,252 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:55:11,253 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:55:11,257 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-12-02 15:55:11,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:55:11,424 INFO L262 TraceCheckSpWp]: Trace formula consists of 616 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 15:55:11,429 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:55:11,463 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-12-02 15:55:11,463 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 15:55:11,464 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1193543819] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:55:11,464 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 15:55:11,464 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-12-02 15:55:11,464 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1369517572] [2023-12-02 15:55:11,464 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:55:11,465 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 15:55:11,465 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:55:11,465 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 15:55:11,466 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 15:55:11,466 INFO L87 Difference]: Start difference. First operand 2563 states and 4581 transitions. Second operand has 3 states, 3 states have (on average 19.666666666666668) internal successors, (59), 2 states have internal predecessors, (59), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-12-02 15:55:11,984 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:55:11,985 INFO L93 Difference]: Finished difference Result 4372 states and 7214 transitions. [2023-12-02 15:55:11,985 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 15:55:11,986 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 19.666666666666668) internal successors, (59), 2 states have internal predecessors, (59), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 96 [2023-12-02 15:55:11,986 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:55:12,010 INFO L225 Difference]: With dead ends: 4372 [2023-12-02 15:55:12,010 INFO L226 Difference]: Without dead ends: 3455 [2023-12-02 15:55:12,016 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 96 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 15:55:12,017 INFO L413 NwaCegarLoop]: 3257 mSDtfsCounter, 3435 mSDsluCounter, 149 mSDsCounter, 0 mSdLazyCounter, 283 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3435 SdHoareTripleChecker+Valid, 3406 SdHoareTripleChecker+Invalid, 285 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 283 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 15:55:12,017 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3435 Valid, 3406 Invalid, 285 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 283 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 15:55:12,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3455 states. [2023-12-02 15:55:12,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3455 to 3443. [2023-12-02 15:55:12,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3443 states, 3107 states have (on average 1.7196652719665273) internal successors, (5343), 3118 states have internal predecessors, (5343), 238 states have call successors, (238), 97 states have call predecessors, (238), 96 states have return successors, (236), 228 states have call predecessors, (236), 236 states have call successors, (236) [2023-12-02 15:55:12,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3443 states to 3443 states and 5817 transitions. [2023-12-02 15:55:12,171 INFO L78 Accepts]: Start accepts. Automaton has 3443 states and 5817 transitions. Word has length 96 [2023-12-02 15:55:12,171 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:55:12,171 INFO L495 AbstractCegarLoop]: Abstraction has 3443 states and 5817 transitions. [2023-12-02 15:55:12,172 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 19.666666666666668) internal successors, (59), 2 states have internal predecessors, (59), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-12-02 15:55:12,172 INFO L276 IsEmpty]: Start isEmpty. Operand 3443 states and 5817 transitions. [2023-12-02 15:55:12,178 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2023-12-02 15:55:12,178 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:55:12,178 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 15:55:12,185 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-12-02 15:55:12,384 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:55:12,385 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:55:12,385 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:55:12,385 INFO L85 PathProgramCache]: Analyzing trace with hash 850273644, now seen corresponding path program 1 times [2023-12-02 15:55:12,385 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:55:12,385 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2091377040] [2023-12-02 15:55:12,386 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:55:12,386 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:55:12,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:55:12,510 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-12-02 15:55:12,510 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:55:12,510 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2091377040] [2023-12-02 15:55:12,511 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2091377040] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:55:12,511 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 15:55:12,511 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 15:55:12,511 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [952325749] [2023-12-02 15:55:12,511 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:55:12,519 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 15:55:12,520 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:55:12,520 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 15:55:12,521 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 15:55:12,521 INFO L87 Difference]: Start difference. First operand 3443 states and 5817 transitions. Second operand has 3 states, 3 states have (on average 18.666666666666668) internal successors, (56), 3 states have internal predecessors, (56), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2023-12-02 15:55:13,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:55:13,093 INFO L93 Difference]: Finished difference Result 4871 states and 7892 transitions. [2023-12-02 15:55:13,099 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 15:55:13,099 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.666666666666668) internal successors, (56), 3 states have internal predecessors, (56), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 96 [2023-12-02 15:55:13,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:55:13,127 INFO L225 Difference]: With dead ends: 4871 [2023-12-02 15:55:13,127 INFO L226 Difference]: Without dead ends: 3939 [2023-12-02 15:55:13,132 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 15:55:13,133 INFO L413 NwaCegarLoop]: 3297 mSDtfsCounter, 79 mSDsluCounter, 3220 mSDsCounter, 0 mSdLazyCounter, 506 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 79 SdHoareTripleChecker+Valid, 6517 SdHoareTripleChecker+Invalid, 506 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 506 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 15:55:13,133 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [79 Valid, 6517 Invalid, 506 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 506 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 15:55:13,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3939 states. [2023-12-02 15:55:13,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3939 to 3783. [2023-12-02 15:55:13,289 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3783 states, 3431 states have (on average 1.7064995628096764) internal successors, (5855), 3442 states have internal predecessors, (5855), 246 states have call successors, (246), 105 states have call predecessors, (246), 104 states have return successors, (244), 236 states have call predecessors, (244), 244 states have call successors, (244) [2023-12-02 15:55:13,302 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3783 states to 3783 states and 6345 transitions. [2023-12-02 15:55:13,302 INFO L78 Accepts]: Start accepts. Automaton has 3783 states and 6345 transitions. Word has length 96 [2023-12-02 15:55:13,303 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:55:13,303 INFO L495 AbstractCegarLoop]: Abstraction has 3783 states and 6345 transitions. [2023-12-02 15:55:13,303 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.666666666666668) internal successors, (56), 3 states have internal predecessors, (56), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2023-12-02 15:55:13,303 INFO L276 IsEmpty]: Start isEmpty. Operand 3783 states and 6345 transitions. [2023-12-02 15:55:13,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2023-12-02 15:55:13,312 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:55:13,312 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 15:55:13,312 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-12-02 15:55:13,312 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:55:13,313 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:55:13,313 INFO L85 PathProgramCache]: Analyzing trace with hash 1061716047, now seen corresponding path program 1 times [2023-12-02 15:55:13,313 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:55:13,313 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [58961509] [2023-12-02 15:55:13,313 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:55:13,313 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:55:13,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:55:13,406 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2023-12-02 15:55:13,406 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:55:13,406 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [58961509] [2023-12-02 15:55:13,406 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [58961509] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:55:13,406 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 15:55:13,406 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 15:55:13,407 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [438971763] [2023-12-02 15:55:13,407 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:55:13,407 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 15:55:13,407 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:55:13,408 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 15:55:13,408 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 15:55:13,408 INFO L87 Difference]: Start difference. First operand 3783 states and 6345 transitions. Second operand has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 15:55:14,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:55:14,052 INFO L93 Difference]: Finished difference Result 7984 states and 12474 transitions. [2023-12-02 15:55:14,052 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 15:55:14,053 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 129 [2023-12-02 15:55:14,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:55:14,088 INFO L225 Difference]: With dead ends: 7984 [2023-12-02 15:55:14,088 INFO L226 Difference]: Without dead ends: 5847 [2023-12-02 15:55:14,095 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 15:55:14,096 INFO L413 NwaCegarLoop]: 3215 mSDtfsCounter, 3423 mSDsluCounter, 149 mSDsCounter, 0 mSdLazyCounter, 277 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3423 SdHoareTripleChecker+Valid, 3364 SdHoareTripleChecker+Invalid, 279 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 277 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 15:55:14,096 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3423 Valid, 3364 Invalid, 279 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 277 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 15:55:14,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5847 states. [2023-12-02 15:55:14,306 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5847 to 5819. [2023-12-02 15:55:14,319 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5819 states, 5139 states have (on average 1.6110138159174936) internal successors, (8279), 5158 states have internal predecessors, (8279), 470 states have call successors, (470), 209 states have call predecessors, (470), 208 states have return successors, (468), 452 states have call predecessors, (468), 468 states have call successors, (468) [2023-12-02 15:55:14,339 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5819 states to 5819 states and 9217 transitions. [2023-12-02 15:55:14,340 INFO L78 Accepts]: Start accepts. Automaton has 5819 states and 9217 transitions. Word has length 129 [2023-12-02 15:55:14,340 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:55:14,341 INFO L495 AbstractCegarLoop]: Abstraction has 5819 states and 9217 transitions. [2023-12-02 15:55:14,341 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 15:55:14,341 INFO L276 IsEmpty]: Start isEmpty. Operand 5819 states and 9217 transitions. [2023-12-02 15:55:14,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2023-12-02 15:55:14,357 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:55:14,357 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 15:55:14,357 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-12-02 15:55:14,357 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:55:14,358 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:55:14,358 INFO L85 PathProgramCache]: Analyzing trace with hash 48461841, now seen corresponding path program 1 times [2023-12-02 15:55:14,358 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:55:14,358 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [183076825] [2023-12-02 15:55:14,358 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:55:14,359 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:55:14,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:55:14,460 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2023-12-02 15:55:14,461 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:55:14,461 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [183076825] [2023-12-02 15:55:14,461 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [183076825] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:55:14,461 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 15:55:14,461 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 15:55:14,461 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1731367316] [2023-12-02 15:55:14,462 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:55:14,462 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 15:55:14,462 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:55:14,463 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 15:55:14,463 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 15:55:14,463 INFO L87 Difference]: Start difference. First operand 5819 states and 9217 transitions. Second operand has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 15:55:15,151 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:55:15,152 INFO L93 Difference]: Finished difference Result 14020 states and 21066 transitions. [2023-12-02 15:55:15,152 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 15:55:15,152 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 129 [2023-12-02 15:55:15,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:55:15,212 INFO L225 Difference]: With dead ends: 14020 [2023-12-02 15:55:15,212 INFO L226 Difference]: Without dead ends: 9847 [2023-12-02 15:55:15,229 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 15:55:15,230 INFO L413 NwaCegarLoop]: 3215 mSDtfsCounter, 3425 mSDsluCounter, 149 mSDsCounter, 0 mSdLazyCounter, 277 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3425 SdHoareTripleChecker+Valid, 3364 SdHoareTripleChecker+Invalid, 279 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 277 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 15:55:15,230 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3425 Valid, 3364 Invalid, 279 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 277 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 15:55:15,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9847 states. [2023-12-02 15:55:15,596 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9847 to 9795. [2023-12-02 15:55:15,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9795 states, 8475 states have (on average 1.5300294985250738) internal successors, (12967), 8510 states have internal predecessors, (12967), 902 states have call successors, (902), 417 states have call predecessors, (902), 416 states have return successors, (900), 868 states have call predecessors, (900), 900 states have call successors, (900) [2023-12-02 15:55:15,650 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9795 states to 9795 states and 14769 transitions. [2023-12-02 15:55:15,651 INFO L78 Accepts]: Start accepts. Automaton has 9795 states and 14769 transitions. Word has length 129 [2023-12-02 15:55:15,651 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:55:15,651 INFO L495 AbstractCegarLoop]: Abstraction has 9795 states and 14769 transitions. [2023-12-02 15:55:15,653 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 15:55:15,653 INFO L276 IsEmpty]: Start isEmpty. Operand 9795 states and 14769 transitions. [2023-12-02 15:55:15,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2023-12-02 15:55:15,683 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:55:15,683 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 15:55:15,683 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2023-12-02 15:55:15,684 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:55:15,684 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:55:15,684 INFO L85 PathProgramCache]: Analyzing trace with hash -1133556272, now seen corresponding path program 1 times [2023-12-02 15:55:15,684 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:55:15,684 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [839629658] [2023-12-02 15:55:15,685 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:55:15,685 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:55:15,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:55:15,773 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2023-12-02 15:55:15,773 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:55:15,774 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [839629658] [2023-12-02 15:55:15,774 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [839629658] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:55:15,774 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 15:55:15,774 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 15:55:15,774 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1757156187] [2023-12-02 15:55:15,775 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:55:15,775 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 15:55:15,775 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:55:15,776 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 15:55:15,776 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 15:55:15,776 INFO L87 Difference]: Start difference. First operand 9795 states and 14769 transitions. Second operand has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 15:55:16,758 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:55:16,758 INFO L93 Difference]: Finished difference Result 25804 states and 37658 transitions. [2023-12-02 15:55:16,759 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 15:55:16,759 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 129 [2023-12-02 15:55:16,759 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:55:16,827 INFO L225 Difference]: With dead ends: 25804 [2023-12-02 15:55:16,827 INFO L226 Difference]: Without dead ends: 17655 [2023-12-02 15:55:16,863 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 15:55:16,864 INFO L413 NwaCegarLoop]: 3230 mSDtfsCounter, 3428 mSDsluCounter, 149 mSDsCounter, 0 mSdLazyCounter, 278 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3428 SdHoareTripleChecker+Valid, 3379 SdHoareTripleChecker+Invalid, 280 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 278 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-12-02 15:55:16,864 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3428 Valid, 3379 Invalid, 280 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 278 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-12-02 15:55:16,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17655 states. [2023-12-02 15:55:17,595 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17655 to 17555. [2023-12-02 15:55:17,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17555 states, 14987 states have (on average 1.4694735437379063) internal successors, (22023), 15054 states have internal predecessors, (22023), 1734 states have call successors, (1734), 833 states have call predecessors, (1734), 832 states have return successors, (1732), 1668 states have call predecessors, (1732), 1732 states have call successors, (1732) [2023-12-02 15:55:17,704 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17555 states to 17555 states and 25489 transitions. [2023-12-02 15:55:17,705 INFO L78 Accepts]: Start accepts. Automaton has 17555 states and 25489 transitions. Word has length 129 [2023-12-02 15:55:17,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:55:17,706 INFO L495 AbstractCegarLoop]: Abstraction has 17555 states and 25489 transitions. [2023-12-02 15:55:17,706 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 15:55:17,706 INFO L276 IsEmpty]: Start isEmpty. Operand 17555 states and 25489 transitions. [2023-12-02 15:55:17,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2023-12-02 15:55:17,789 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:55:17,789 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 15:55:17,790 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2023-12-02 15:55:17,790 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:55:17,790 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:55:17,790 INFO L85 PathProgramCache]: Analyzing trace with hash 1857093967, now seen corresponding path program 1 times [2023-12-02 15:55:17,790 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:55:17,791 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1109130868] [2023-12-02 15:55:17,791 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:55:17,791 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:55:17,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:55:18,190 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 10 proven. 45 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2023-12-02 15:55:18,191 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:55:18,191 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1109130868] [2023-12-02 15:55:18,191 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1109130868] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:55:18,191 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [908803647] [2023-12-02 15:55:18,191 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:55:18,192 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:55:18,192 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:55:18,193 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:55:18,195 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-12-02 15:55:18,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:55:18,418 INFO L262 TraceCheckSpWp]: Trace formula consists of 812 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 15:55:18,423 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:55:18,487 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 98 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-12-02 15:55:18,488 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 15:55:18,488 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [908803647] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:55:18,488 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 15:55:18,489 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-12-02 15:55:18,489 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [663124627] [2023-12-02 15:55:18,489 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:55:18,490 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 15:55:18,490 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:55:18,490 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 15:55:18,491 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 15:55:18,491 INFO L87 Difference]: Start difference. First operand 17555 states and 25489 transitions. Second operand has 3 states, 3 states have (on average 41.333333333333336) internal successors, (124), 3 states have internal predecessors, (124), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 15:55:19,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:55:19,659 INFO L93 Difference]: Finished difference Result 25771 states and 37527 transitions. [2023-12-02 15:55:19,660 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 15:55:19,660 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 41.333333333333336) internal successors, (124), 3 states have internal predecessors, (124), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 150 [2023-12-02 15:55:19,660 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:55:19,729 INFO L225 Difference]: With dead ends: 25771 [2023-12-02 15:55:19,729 INFO L226 Difference]: Without dead ends: 17623 [2023-12-02 15:55:19,759 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 152 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 15:55:19,760 INFO L413 NwaCegarLoop]: 3346 mSDtfsCounter, 146 mSDsluCounter, 3207 mSDsCounter, 0 mSdLazyCounter, 514 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 146 SdHoareTripleChecker+Valid, 6553 SdHoareTripleChecker+Invalid, 516 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 514 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 15:55:19,760 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [146 Valid, 6553 Invalid, 516 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 514 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 15:55:19,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17623 states. [2023-12-02 15:55:20,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17623 to 17491. [2023-12-02 15:55:20,373 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17491 states, 14923 states have (on average 1.4543322388259734) internal successors, (21703), 14990 states have internal predecessors, (21703), 1734 states have call successors, (1734), 833 states have call predecessors, (1734), 832 states have return successors, (1732), 1668 states have call predecessors, (1732), 1732 states have call successors, (1732) [2023-12-02 15:55:20,439 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17491 states to 17491 states and 25169 transitions. [2023-12-02 15:55:20,440 INFO L78 Accepts]: Start accepts. Automaton has 17491 states and 25169 transitions. Word has length 150 [2023-12-02 15:55:20,440 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:55:20,440 INFO L495 AbstractCegarLoop]: Abstraction has 17491 states and 25169 transitions. [2023-12-02 15:55:20,440 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 41.333333333333336) internal successors, (124), 3 states have internal predecessors, (124), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 15:55:20,441 INFO L276 IsEmpty]: Start isEmpty. Operand 17491 states and 25169 transitions. [2023-12-02 15:55:20,492 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2023-12-02 15:55:20,493 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:55:20,493 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 15:55:20,499 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-12-02 15:55:20,694 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:55:20,694 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:55:20,695 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:55:20,695 INFO L85 PathProgramCache]: Analyzing trace with hash 1592837807, now seen corresponding path program 1 times [2023-12-02 15:55:20,695 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:55:20,695 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [915715742] [2023-12-02 15:55:20,695 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:55:20,695 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:55:20,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:55:21,063 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 10 proven. 43 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2023-12-02 15:55:21,063 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:55:21,063 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [915715742] [2023-12-02 15:55:21,063 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [915715742] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:55:21,064 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1504637389] [2023-12-02 15:55:21,064 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:55:21,064 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:55:21,064 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:55:21,065 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:55:21,068 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-12-02 15:55:21,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:55:21,265 INFO L262 TraceCheckSpWp]: Trace formula consists of 818 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 15:55:21,269 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:55:21,295 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 71 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-12-02 15:55:21,295 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 15:55:21,295 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1504637389] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:55:21,295 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 15:55:21,296 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-12-02 15:55:21,296 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [596512370] [2023-12-02 15:55:21,296 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:55:21,296 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 15:55:21,296 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:55:21,297 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 15:55:21,297 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 15:55:21,298 INFO L87 Difference]: Start difference. First operand 17491 states and 25169 transitions. Second operand has 3 states, 3 states have (on average 34.333333333333336) internal successors, (103), 3 states have internal predecessors, (103), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 15:55:22,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:55:22,100 INFO L93 Difference]: Finished difference Result 25675 states and 37047 transitions. [2023-12-02 15:55:22,101 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 15:55:22,101 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 34.333333333333336) internal successors, (103), 3 states have internal predecessors, (103), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 150 [2023-12-02 15:55:22,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:55:22,140 INFO L225 Difference]: With dead ends: 25675 [2023-12-02 15:55:22,140 INFO L226 Difference]: Without dead ends: 17559 [2023-12-02 15:55:22,164 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 152 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 15:55:22,165 INFO L413 NwaCegarLoop]: 3341 mSDtfsCounter, 162 mSDsluCounter, 3206 mSDsCounter, 0 mSdLazyCounter, 514 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 162 SdHoareTripleChecker+Valid, 6547 SdHoareTripleChecker+Invalid, 516 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 514 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 15:55:22,165 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [162 Valid, 6547 Invalid, 516 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 514 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 15:55:22,185 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17559 states. [2023-12-02 15:55:22,809 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17559 to 17427. [2023-12-02 15:55:22,823 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17427 states, 14859 states have (on average 1.4390605020526281) internal successors, (21383), 14926 states have internal predecessors, (21383), 1734 states have call successors, (1734), 833 states have call predecessors, (1734), 832 states have return successors, (1732), 1668 states have call predecessors, (1732), 1732 states have call successors, (1732) [2023-12-02 15:55:22,876 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17427 states to 17427 states and 24849 transitions. [2023-12-02 15:55:22,877 INFO L78 Accepts]: Start accepts. Automaton has 17427 states and 24849 transitions. Word has length 150 [2023-12-02 15:55:22,878 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:55:22,878 INFO L495 AbstractCegarLoop]: Abstraction has 17427 states and 24849 transitions. [2023-12-02 15:55:22,878 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 34.333333333333336) internal successors, (103), 3 states have internal predecessors, (103), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 15:55:22,878 INFO L276 IsEmpty]: Start isEmpty. Operand 17427 states and 24849 transitions. [2023-12-02 15:55:22,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2023-12-02 15:55:22,916 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:55:22,917 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 15:55:22,924 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-12-02 15:55:23,117 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:55:23,117 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:55:23,118 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:55:23,118 INFO L85 PathProgramCache]: Analyzing trace with hash 467577838, now seen corresponding path program 1 times [2023-12-02 15:55:23,118 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:55:23,118 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [68138995] [2023-12-02 15:55:23,118 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:55:23,118 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:55:23,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:55:23,441 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 10 proven. 42 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2023-12-02 15:55:23,441 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:55:23,441 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [68138995] [2023-12-02 15:55:23,441 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [68138995] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:55:23,441 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1407485154] [2023-12-02 15:55:23,441 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:55:23,441 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:55:23,442 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:55:23,442 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:55:23,446 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-12-02 15:55:23,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:55:23,660 INFO L262 TraceCheckSpWp]: Trace formula consists of 821 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 15:55:23,664 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:55:23,704 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 70 proven. 0 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2023-12-02 15:55:23,704 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 15:55:23,705 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1407485154] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:55:23,705 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 15:55:23,705 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-12-02 15:55:23,705 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1326664222] [2023-12-02 15:55:23,705 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:55:23,706 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 15:55:23,706 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:55:23,707 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 15:55:23,707 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 15:55:23,707 INFO L87 Difference]: Start difference. First operand 17427 states and 24849 transitions. Second operand has 3 states, 3 states have (on average 34.333333333333336) internal successors, (103), 3 states have internal predecessors, (103), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 15:55:24,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:55:24,549 INFO L93 Difference]: Finished difference Result 29217 states and 40590 transitions. [2023-12-02 15:55:24,550 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 15:55:24,550 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 34.333333333333336) internal successors, (103), 3 states have internal predecessors, (103), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 150 [2023-12-02 15:55:24,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:55:24,593 INFO L225 Difference]: With dead ends: 29217 [2023-12-02 15:55:24,593 INFO L226 Difference]: Without dead ends: 21197 [2023-12-02 15:55:24,610 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 152 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 15:55:24,610 INFO L413 NwaCegarLoop]: 3234 mSDtfsCounter, 3427 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 254 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3427 SdHoareTripleChecker+Valid, 3273 SdHoareTripleChecker+Invalid, 258 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 254 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 15:55:24,611 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3427 Valid, 3273 Invalid, 258 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 254 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 15:55:24,631 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21197 states. [2023-12-02 15:55:25,206 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21197 to 21197. [2023-12-02 15:55:25,221 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21197 states, 18249 states have (on average 1.392569455860595) internal successors, (25413), 18316 states have internal predecessors, (25413), 1860 states have call successors, (1860), 1087 states have call predecessors, (1860), 1086 states have return successors, (1858), 1794 states have call predecessors, (1858), 1858 states have call successors, (1858) [2023-12-02 15:55:25,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21197 states to 21197 states and 29131 transitions. [2023-12-02 15:55:25,265 INFO L78 Accepts]: Start accepts. Automaton has 21197 states and 29131 transitions. Word has length 150 [2023-12-02 15:55:25,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:55:25,265 INFO L495 AbstractCegarLoop]: Abstraction has 21197 states and 29131 transitions. [2023-12-02 15:55:25,265 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 34.333333333333336) internal successors, (103), 3 states have internal predecessors, (103), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 15:55:25,266 INFO L276 IsEmpty]: Start isEmpty. Operand 21197 states and 29131 transitions. [2023-12-02 15:55:25,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2023-12-02 15:55:25,290 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:55:25,291 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 15:55:25,297 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-12-02 15:55:25,491 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:55:25,491 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:55:25,492 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:55:25,492 INFO L85 PathProgramCache]: Analyzing trace with hash -1679648820, now seen corresponding path program 1 times [2023-12-02 15:55:25,492 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:55:25,492 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [75694161] [2023-12-02 15:55:25,492 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:55:25,492 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:55:25,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:55:26,050 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 12 proven. 44 refuted. 0 times theorem prover too weak. 53 trivial. 0 not checked. [2023-12-02 15:55:26,050 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:55:26,050 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [75694161] [2023-12-02 15:55:26,050 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [75694161] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:55:26,051 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1412059919] [2023-12-02 15:55:26,051 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:55:26,051 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:55:26,051 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:55:26,052 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:55:26,054 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-12-02 15:55:26,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:55:26,269 INFO L262 TraceCheckSpWp]: Trace formula consists of 915 conjuncts, 24 conjunts are in the unsatisfiable core [2023-12-02 15:55:26,273 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:55:26,468 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 70 proven. 17 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2023-12-02 15:55:26,469 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 15:55:26,894 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 13 proven. 44 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2023-12-02 15:55:26,895 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1412059919] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 15:55:26,895 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [455419494] [2023-12-02 15:55:26,921 INFO L159 IcfgInterpreter]: Started Sifa with 79 locations of interest [2023-12-02 15:55:26,921 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 15:55:26,925 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 15:55:26,931 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 15:55:26,931 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 15:55:49,776 INFO L197 IcfgInterpreter]: Interpreting procedure error with input of size 12 for LOIs [2023-12-02 15:55:49,778 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events with input of size 169 for LOIs [2023-12-02 15:55:49,895 INFO L197 IcfgInterpreter]: Interpreting procedure fire_delta_events with input of size 232 for LOIs [2023-12-02 15:55:50,416 INFO L197 IcfgInterpreter]: Interpreting procedure update_channels with input of size 1 for LOIs [2023-12-02 15:55:50,417 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread with input of size 1 for LOIs [2023-12-02 15:55:50,439 INFO L197 IcfgInterpreter]: Interpreting procedure immediate_notify with input of size 37 for LOIs [2023-12-02 15:55:50,497 INFO L197 IcfgInterpreter]: Interpreting procedure activate_threads with input of size 1 for LOIs [2023-12-02 15:55:50,655 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 15:56:00,685 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '301020#(and (= ~m_pc~0 1) (= ~m_st~0 1) (not (= ~token~0 (+ 6 ~local~0))))' at error location [2023-12-02 15:56:00,685 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 15:56:00,686 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 15:56:00,686 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7, 6] total 9 [2023-12-02 15:56:00,686 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [396936469] [2023-12-02 15:56:00,686 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 15:56:00,687 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-12-02 15:56:00,687 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:56:00,687 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-12-02 15:56:00,689 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=395, Invalid=4717, Unknown=0, NotChecked=0, Total=5112 [2023-12-02 15:56:00,690 INFO L87 Difference]: Start difference. First operand 21197 states and 29131 transitions. Second operand has 9 states, 9 states have (on average 17.77777777777778) internal successors, (160), 9 states have internal predecessors, (160), 5 states have call successors, (29), 6 states have call predecessors, (29), 7 states have return successors, (30), 6 states have call predecessors, (30), 5 states have call successors, (30) [2023-12-02 15:56:02,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:56:02,470 INFO L93 Difference]: Finished difference Result 51705 states and 69285 transitions. [2023-12-02 15:56:02,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-12-02 15:56:02,471 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 17.77777777777778) internal successors, (160), 9 states have internal predecessors, (160), 5 states have call successors, (29), 6 states have call predecessors, (29), 7 states have return successors, (30), 6 states have call predecessors, (30), 5 states have call successors, (30) Word has length 149 [2023-12-02 15:56:02,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:56:02,527 INFO L225 Difference]: With dead ends: 51705 [2023-12-02 15:56:02,527 INFO L226 Difference]: Without dead ends: 32155 [2023-12-02 15:56:02,558 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 468 GetRequests, 392 SyntacticMatches, 0 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2096 ImplicationChecksByTransitivity, 10.2s TimeCoverageRelationStatistics Valid=456, Invalid=5550, Unknown=0, NotChecked=0, Total=6006 [2023-12-02 15:56:02,558 INFO L413 NwaCegarLoop]: 3231 mSDtfsCounter, 7110 mSDsluCounter, 9606 mSDsCounter, 0 mSdLazyCounter, 1132 mSolverCounterSat, 126 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7125 SdHoareTripleChecker+Valid, 12837 SdHoareTripleChecker+Invalid, 1258 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 126 IncrementalHoareTripleChecker+Valid, 1132 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-12-02 15:56:02,558 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7125 Valid, 12837 Invalid, 1258 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [126 Valid, 1132 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-12-02 15:56:02,580 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32155 states. [2023-12-02 15:56:03,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32155 to 30711. [2023-12-02 15:56:03,402 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30711 states, 26327 states have (on average 1.3675314316101341) internal successors, (36003), 26426 states have internal predecessors, (36003), 2754 states have call successors, (2754), 1629 states have call predecessors, (2754), 1628 states have return successors, (2752), 2656 states have call predecessors, (2752), 2752 states have call successors, (2752) [2023-12-02 15:56:03,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30711 states to 30711 states and 41509 transitions. [2023-12-02 15:56:03,467 INFO L78 Accepts]: Start accepts. Automaton has 30711 states and 41509 transitions. Word has length 149 [2023-12-02 15:56:03,468 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:56:03,468 INFO L495 AbstractCegarLoop]: Abstraction has 30711 states and 41509 transitions. [2023-12-02 15:56:03,468 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 17.77777777777778) internal successors, (160), 9 states have internal predecessors, (160), 5 states have call successors, (29), 6 states have call predecessors, (29), 7 states have return successors, (30), 6 states have call predecessors, (30), 5 states have call successors, (30) [2023-12-02 15:56:03,468 INFO L276 IsEmpty]: Start isEmpty. Operand 30711 states and 41509 transitions. [2023-12-02 15:56:03,513 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 152 [2023-12-02 15:56:03,514 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:56:03,514 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 15:56:03,519 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2023-12-02 15:56:03,714 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2023-12-02 15:56:03,715 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:56:03,715 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:56:03,715 INFO L85 PathProgramCache]: Analyzing trace with hash 320724254, now seen corresponding path program 1 times [2023-12-02 15:56:03,715 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:56:03,715 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [555798642] [2023-12-02 15:56:03,715 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:56:03,716 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:56:03,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:56:03,969 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 10 proven. 42 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2023-12-02 15:56:03,969 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:56:03,969 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [555798642] [2023-12-02 15:56:03,970 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [555798642] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:56:03,970 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [724860552] [2023-12-02 15:56:03,970 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:56:03,970 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:56:03,970 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:56:03,971 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:56:03,974 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-12-02 15:56:04,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:56:04,157 INFO L262 TraceCheckSpWp]: Trace formula consists of 823 conjuncts, 5 conjunts are in the unsatisfiable core [2023-12-02 15:56:04,162 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:56:04,206 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 88 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-12-02 15:56:04,206 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 15:56:04,206 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [724860552] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:56:04,206 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 15:56:04,206 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 8 [2023-12-02 15:56:04,206 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1592498911] [2023-12-02 15:56:04,207 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:56:04,207 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 15:56:04,207 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:56:04,208 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 15:56:04,208 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2023-12-02 15:56:04,208 INFO L87 Difference]: Start difference. First operand 30711 states and 41509 transitions. Second operand has 4 states, 4 states have (on average 30.0) internal successors, (120), 4 states have internal predecessors, (120), 2 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) [2023-12-02 15:56:05,494 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:56:05,494 INFO L93 Difference]: Finished difference Result 43508 states and 58471 transitions. [2023-12-02 15:56:05,495 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-12-02 15:56:05,495 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 30.0) internal successors, (120), 4 states have internal predecessors, (120), 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 151 [2023-12-02 15:56:05,495 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:56:05,562 INFO L225 Difference]: With dead ends: 43508 [2023-12-02 15:56:05,562 INFO L226 Difference]: Without dead ends: 32371 [2023-12-02 15:56:05,577 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 152 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2023-12-02 15:56:05,578 INFO L413 NwaCegarLoop]: 3290 mSDtfsCounter, 3418 mSDsluCounter, 3440 mSDsCounter, 0 mSdLazyCounter, 561 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3418 SdHoareTripleChecker+Valid, 6730 SdHoareTripleChecker+Invalid, 564 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 561 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-12-02 15:56:05,578 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3418 Valid, 6730 Invalid, 564 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 561 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-12-02 15:56:05,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32371 states. [2023-12-02 15:56:06,368 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32371 to 32138. [2023-12-02 15:56:06,390 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32138 states, 27613 states have (on average 1.3609169594031796) internal successors, (37579), 27776 states have internal predecessors, (37579), 2762 states have call successors, (2762), 1634 states have call predecessors, (2762), 1761 states have return successors, (2888), 2728 states have call predecessors, (2888), 2760 states have call successors, (2888) [2023-12-02 15:56:06,452 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32138 states to 32138 states and 43229 transitions. [2023-12-02 15:56:06,453 INFO L78 Accepts]: Start accepts. Automaton has 32138 states and 43229 transitions. Word has length 151 [2023-12-02 15:56:06,453 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:56:06,453 INFO L495 AbstractCegarLoop]: Abstraction has 32138 states and 43229 transitions. [2023-12-02 15:56:06,453 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 30.0) internal successors, (120), 4 states have internal predecessors, (120), 2 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) [2023-12-02 15:56:06,453 INFO L276 IsEmpty]: Start isEmpty. Operand 32138 states and 43229 transitions. [2023-12-02 15:56:06,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 152 [2023-12-02 15:56:06,487 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:56:06,487 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 15:56:06,494 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2023-12-02 15:56:06,688 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2023-12-02 15:56:06,688 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:56:06,688 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:56:06,688 INFO L85 PathProgramCache]: Analyzing trace with hash -74893148, now seen corresponding path program 1 times [2023-12-02 15:56:06,688 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:56:06,689 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1979243440] [2023-12-02 15:56:06,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:56:06,689 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:56:06,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:56:06,784 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 21 proven. 6 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2023-12-02 15:56:06,785 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:56:06,785 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1979243440] [2023-12-02 15:56:06,785 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1979243440] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:56:06,785 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [380125096] [2023-12-02 15:56:06,785 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:56:06,785 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:56:06,785 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:56:06,786 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:56:06,788 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-12-02 15:56:06,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:56:06,962 INFO L262 TraceCheckSpWp]: Trace formula consists of 817 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 15:56:06,965 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:56:06,990 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 78 proven. 0 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2023-12-02 15:56:06,990 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 15:56:06,990 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [380125096] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:56:06,990 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 15:56:06,990 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2023-12-02 15:56:06,990 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1148591142] [2023-12-02 15:56:06,991 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:56:06,991 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 15:56:06,991 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:56:06,992 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 15:56:06,992 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-12-02 15:56:06,992 INFO L87 Difference]: Start difference. First operand 32138 states and 43229 transitions. Second operand has 3 states, 3 states have (on average 35.333333333333336) internal successors, (106), 3 states have internal predecessors, (106), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 15:56:08,352 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:56:08,352 INFO L93 Difference]: Finished difference Result 60190 states and 80875 transitions. [2023-12-02 15:56:08,353 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 15:56:08,353 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 35.333333333333336) internal successors, (106), 3 states have internal predecessors, (106), 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 151 [2023-12-02 15:56:08,353 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:56:08,451 INFO L225 Difference]: With dead ends: 60190 [2023-12-02 15:56:08,451 INFO L226 Difference]: Without dead ends: 44706 [2023-12-02 15:56:08,473 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 151 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-12-02 15:56:08,473 INFO L413 NwaCegarLoop]: 3322 mSDtfsCounter, 122 mSDsluCounter, 3220 mSDsCounter, 0 mSdLazyCounter, 510 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 122 SdHoareTripleChecker+Valid, 6542 SdHoareTripleChecker+Invalid, 510 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 510 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 15:56:08,473 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [122 Valid, 6542 Invalid, 510 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 510 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 15:56:08,503 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44706 states. [2023-12-02 15:56:09,476 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44706 to 37202. [2023-12-02 15:56:09,502 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37202 states, 32389 states have (on average 1.3825372811757077) internal successors, (44779), 32552 states have internal predecessors, (44779), 2906 states have call successors, (2906), 1778 states have call predecessors, (2906), 1905 states have return successors, (3032), 2872 states have call predecessors, (3032), 2904 states have call successors, (3032) [2023-12-02 15:56:09,574 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37202 states to 37202 states and 50717 transitions. [2023-12-02 15:56:09,576 INFO L78 Accepts]: Start accepts. Automaton has 37202 states and 50717 transitions. Word has length 151 [2023-12-02 15:56:09,576 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:56:09,576 INFO L495 AbstractCegarLoop]: Abstraction has 37202 states and 50717 transitions. [2023-12-02 15:56:09,576 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 35.333333333333336) internal successors, (106), 3 states have internal predecessors, (106), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 15:56:09,576 INFO L276 IsEmpty]: Start isEmpty. Operand 37202 states and 50717 transitions. [2023-12-02 15:56:09,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2023-12-02 15:56:09,620 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:56:09,620 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 15:56:09,625 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2023-12-02 15:56:09,820 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:56:09,820 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:56:09,821 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:56:09,821 INFO L85 PathProgramCache]: Analyzing trace with hash 477134813, now seen corresponding path program 2 times [2023-12-02 15:56:09,821 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:56:09,821 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [753554699] [2023-12-02 15:56:09,821 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:56:09,821 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:56:09,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:56:10,000 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 10 proven. 43 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2023-12-02 15:56:10,000 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:56:10,000 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [753554699] [2023-12-02 15:56:10,000 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [753554699] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:56:10,000 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1570828763] [2023-12-02 15:56:10,001 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 15:56:10,001 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:56:10,001 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:56:10,002 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:56:10,013 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-12-02 15:56:10,194 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-12-02 15:56:10,194 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 15:56:10,197 INFO L262 TraceCheckSpWp]: Trace formula consists of 775 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 15:56:10,200 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:56:10,218 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 75 proven. 0 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2023-12-02 15:56:10,218 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 15:56:10,218 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1570828763] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:56:10,218 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 15:56:10,218 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-12-02 15:56:10,218 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [490531547] [2023-12-02 15:56:10,219 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:56:10,219 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 15:56:10,219 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:56:10,219 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 15:56:10,220 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 15:56:10,220 INFO L87 Difference]: Start difference. First operand 37202 states and 50717 transitions. Second operand has 3 states, 3 states have (on average 35.666666666666664) internal successors, (107), 3 states have internal predecessors, (107), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 15:56:11,405 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:56:11,405 INFO L93 Difference]: Finished difference Result 51011 states and 69693 transitions. [2023-12-02 15:56:11,406 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 15:56:11,406 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 35.666666666666664) internal successors, (107), 3 states have internal predecessors, (107), 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 152 [2023-12-02 15:56:11,406 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:56:11,484 INFO L225 Difference]: With dead ends: 51011 [2023-12-02 15:56:11,484 INFO L226 Difference]: Without dead ends: 35602 [2023-12-02 15:56:11,504 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 154 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 15:56:11,505 INFO L413 NwaCegarLoop]: 3232 mSDtfsCounter, 40 mSDsluCounter, 3210 mSDsCounter, 0 mSdLazyCounter, 495 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 6442 SdHoareTripleChecker+Invalid, 495 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 495 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 15:56:11,505 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [40 Valid, 6442 Invalid, 495 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 495 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 15:56:11,530 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35602 states. [2023-12-02 15:56:12,403 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35602 to 33394. [2023-12-02 15:56:12,426 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33394 states, 28965 states have (on average 1.397928534438115) internal successors, (40491), 29032 states have internal predecessors, (40491), 2778 states have call successors, (2778), 1650 states have call predecessors, (2778), 1649 states have return successors, (2776), 2712 states have call predecessors, (2776), 2776 states have call successors, (2776) [2023-12-02 15:56:12,490 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33394 states to 33394 states and 46045 transitions. [2023-12-02 15:56:12,491 INFO L78 Accepts]: Start accepts. Automaton has 33394 states and 46045 transitions. Word has length 152 [2023-12-02 15:56:12,491 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:56:12,491 INFO L495 AbstractCegarLoop]: Abstraction has 33394 states and 46045 transitions. [2023-12-02 15:56:12,491 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 35.666666666666664) internal successors, (107), 3 states have internal predecessors, (107), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 15:56:12,491 INFO L276 IsEmpty]: Start isEmpty. Operand 33394 states and 46045 transitions. [2023-12-02 15:56:12,528 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2023-12-02 15:56:12,528 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:56:12,529 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 15:56:12,535 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2023-12-02 15:56:12,729 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2023-12-02 15:56:12,729 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:56:12,729 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:56:12,730 INFO L85 PathProgramCache]: Analyzing trace with hash 1812922170, now seen corresponding path program 1 times [2023-12-02 15:56:12,730 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:56:12,730 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1565941004] [2023-12-02 15:56:12,730 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:56:12,730 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:56:12,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:56:12,903 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 10 proven. 43 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2023-12-02 15:56:12,904 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:56:12,904 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1565941004] [2023-12-02 15:56:12,904 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1565941004] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:56:12,904 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [141284810] [2023-12-02 15:56:12,904 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:56:12,904 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:56:12,905 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:56:12,905 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:56:12,908 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-12-02 15:56:13,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:56:13,094 INFO L262 TraceCheckSpWp]: Trace formula consists of 826 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 15:56:13,097 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:56:13,124 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 76 proven. 0 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2023-12-02 15:56:13,125 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 15:56:13,125 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [141284810] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:56:13,125 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 15:56:13,125 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-12-02 15:56:13,125 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [684428337] [2023-12-02 15:56:13,125 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:56:13,126 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 15:56:13,126 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:56:13,126 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 15:56:13,126 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 15:56:13,127 INFO L87 Difference]: Start difference. First operand 33394 states and 46045 transitions. Second operand has 3 states, 3 states have (on average 36.333333333333336) internal successors, (109), 3 states have internal predecessors, (109), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 15:56:14,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:56:14,959 INFO L93 Difference]: Finished difference Result 78862 states and 108684 transitions. [2023-12-02 15:56:14,960 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 15:56:14,960 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 36.333333333333336) internal successors, (109), 3 states have internal predecessors, (109), 3 states have call successors, (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 153 [2023-12-02 15:56:14,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:56:15,046 INFO L225 Difference]: With dead ends: 78862 [2023-12-02 15:56:15,046 INFO L226 Difference]: Without dead ends: 47166 [2023-12-02 15:56:15,086 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 155 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 15:56:15,087 INFO L413 NwaCegarLoop]: 3233 mSDtfsCounter, 87 mSDsluCounter, 3196 mSDsCounter, 0 mSdLazyCounter, 491 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 6429 SdHoareTripleChecker+Invalid, 493 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 491 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 15:56:15,087 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [87 Valid, 6429 Invalid, 493 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 491 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 15:56:15,123 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47166 states. [2023-12-02 15:56:16,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47166 to 38462. [2023-12-02 15:56:16,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38462 states, 33743 states have (on average 1.413419079512788) internal successors, (47693), 33811 states have internal predecessors, (47693), 2923 states have call successors, (2923), 1795 states have call predecessors, (2923), 1794 states have return successors, (2921), 2856 states have call predecessors, (2921), 2921 states have call successors, (2921) [2023-12-02 15:56:16,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38462 states to 38462 states and 53537 transitions. [2023-12-02 15:56:16,535 INFO L78 Accepts]: Start accepts. Automaton has 38462 states and 53537 transitions. Word has length 153 [2023-12-02 15:56:16,536 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:56:16,536 INFO L495 AbstractCegarLoop]: Abstraction has 38462 states and 53537 transitions. [2023-12-02 15:56:16,536 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 36.333333333333336) internal successors, (109), 3 states have internal predecessors, (109), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 15:56:16,536 INFO L276 IsEmpty]: Start isEmpty. Operand 38462 states and 53537 transitions. [2023-12-02 15:56:16,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2023-12-02 15:56:16,589 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:56:16,589 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 15:56:16,594 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2023-12-02 15:56:16,789 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2023-12-02 15:56:16,790 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:56:16,790 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:56:16,790 INFO L85 PathProgramCache]: Analyzing trace with hash -211827517, now seen corresponding path program 1 times [2023-12-02 15:56:16,790 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:56:16,790 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [954663154] [2023-12-02 15:56:16,790 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:56:16,790 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:56:16,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:56:17,040 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 18 proven. 43 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2023-12-02 15:56:17,040 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:56:17,040 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [954663154] [2023-12-02 15:56:17,040 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [954663154] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:56:17,040 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2105040832] [2023-12-02 15:56:17,040 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:56:17,041 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:56:17,041 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:56:17,042 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:56:17,044 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-12-02 15:56:17,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:56:17,194 INFO L262 TraceCheckSpWp]: Trace formula consists of 832 conjuncts, 9 conjunts are in the unsatisfiable core [2023-12-02 15:56:17,197 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:56:17,264 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 66 proven. 0 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2023-12-02 15:56:17,264 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 15:56:17,265 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2105040832] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:56:17,265 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 15:56:17,265 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 10 [2023-12-02 15:56:17,265 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1338129533] [2023-12-02 15:56:17,265 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:56:17,265 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 15:56:17,265 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:56:17,266 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 15:56:17,266 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2023-12-02 15:56:17,266 INFO L87 Difference]: Start difference. First operand 38462 states and 53537 transitions. Second operand has 6 states, 6 states have (on average 16.833333333333332) internal successors, (101), 6 states have internal predecessors, (101), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 15:56:19,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:56:19,887 INFO L93 Difference]: Finished difference Result 92722 states and 127491 transitions. [2023-12-02 15:56:19,887 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-12-02 15:56:19,887 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 16.833333333333332) internal successors, (101), 6 states have internal predecessors, (101), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 155 [2023-12-02 15:56:19,888 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:56:19,985 INFO L225 Difference]: With dead ends: 92722 [2023-12-02 15:56:19,986 INFO L226 Difference]: Without dead ends: 55958 [2023-12-02 15:56:20,018 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 154 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2023-12-02 15:56:20,019 INFO L413 NwaCegarLoop]: 3210 mSDtfsCounter, 7073 mSDsluCounter, 6336 mSDsCounter, 0 mSdLazyCounter, 793 mSolverCounterSat, 125 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7088 SdHoareTripleChecker+Valid, 9546 SdHoareTripleChecker+Invalid, 918 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 125 IncrementalHoareTripleChecker+Valid, 793 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-12-02 15:56:20,019 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7088 Valid, 9546 Invalid, 918 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [125 Valid, 793 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-12-02 15:56:20,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55958 states. [2023-12-02 15:56:21,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55958 to 55954. [2023-12-02 15:56:22,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55954 states, 48939 states have (on average 1.3906495841762194) internal successors, (68057), 49039 states have internal predecessors, (68057), 4327 states have call successors, (4327), 2687 states have call predecessors, (4327), 2686 states have return successors, (4325), 4228 states have call predecessors, (4325), 4325 states have call successors, (4325) [2023-12-02 15:56:22,117 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55954 states to 55954 states and 76709 transitions. [2023-12-02 15:56:22,119 INFO L78 Accepts]: Start accepts. Automaton has 55954 states and 76709 transitions. Word has length 155 [2023-12-02 15:56:22,119 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:56:22,120 INFO L495 AbstractCegarLoop]: Abstraction has 55954 states and 76709 transitions. [2023-12-02 15:56:22,120 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 16.833333333333332) internal successors, (101), 6 states have internal predecessors, (101), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 15:56:22,120 INFO L276 IsEmpty]: Start isEmpty. Operand 55954 states and 76709 transitions. [2023-12-02 15:56:22,286 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 152 [2023-12-02 15:56:22,286 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:56:22,286 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 15:56:22,292 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2023-12-02 15:56:22,487 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2023-12-02 15:56:22,487 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:56:22,487 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:56:22,487 INFO L85 PathProgramCache]: Analyzing trace with hash -1227762182, now seen corresponding path program 1 times [2023-12-02 15:56:22,487 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:56:22,487 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1483038811] [2023-12-02 15:56:22,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:56:22,488 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:56:22,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:56:22,572 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 23 proven. 4 refuted. 0 times theorem prover too weak. 76 trivial. 0 not checked. [2023-12-02 15:56:22,573 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:56:22,573 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1483038811] [2023-12-02 15:56:22,573 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1483038811] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:56:22,573 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1113672488] [2023-12-02 15:56:22,573 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:56:22,573 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:56:22,573 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:56:22,574 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:56:22,576 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-12-02 15:56:22,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:56:22,731 INFO L262 TraceCheckSpWp]: Trace formula consists of 814 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 15:56:22,734 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:56:22,753 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 80 proven. 0 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2023-12-02 15:56:22,753 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 15:56:22,753 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1113672488] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:56:22,754 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 15:56:22,754 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2023-12-02 15:56:22,754 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [656576115] [2023-12-02 15:56:22,754 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:56:22,754 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 15:56:22,755 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:56:22,755 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 15:56:22,755 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-12-02 15:56:22,755 INFO L87 Difference]: Start difference. First operand 55954 states and 76709 transitions. Second operand has 3 states, 3 states have (on average 35.333333333333336) internal successors, (106), 3 states have internal predecessors, (106), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 15:56:25,367 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:56:25,368 INFO L93 Difference]: Finished difference Result 106346 states and 146231 transitions. [2023-12-02 15:56:25,368 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 15:56:25,368 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 35.333333333333336) internal successors, (106), 3 states have internal predecessors, (106), 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 151 [2023-12-02 15:56:25,369 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:56:25,503 INFO L225 Difference]: With dead ends: 106346 [2023-12-02 15:56:25,503 INFO L226 Difference]: Without dead ends: 70002 [2023-12-02 15:56:25,548 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 151 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-12-02 15:56:25,548 INFO L413 NwaCegarLoop]: 3322 mSDtfsCounter, 110 mSDsluCounter, 3220 mSDsCounter, 0 mSdLazyCounter, 508 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 110 SdHoareTripleChecker+Valid, 6542 SdHoareTripleChecker+Invalid, 508 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 508 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 15:56:25,549 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [110 Valid, 6542 Invalid, 508 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 508 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 15:56:25,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70002 states. [2023-12-02 15:56:28,211 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70002 to 65218. [2023-12-02 15:56:28,248 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65218 states, 57627 states have (on average 1.4058861297655614) internal successors, (81017), 57727 states have internal predecessors, (81017), 4615 states have call successors, (4615), 2975 states have call predecessors, (4615), 2974 states have return successors, (4613), 4516 states have call predecessors, (4613), 4613 states have call successors, (4613) [2023-12-02 15:56:28,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65218 states to 65218 states and 90245 transitions. [2023-12-02 15:56:28,435 INFO L78 Accepts]: Start accepts. Automaton has 65218 states and 90245 transitions. Word has length 151 [2023-12-02 15:56:28,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:56:28,435 INFO L495 AbstractCegarLoop]: Abstraction has 65218 states and 90245 transitions. [2023-12-02 15:56:28,435 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 35.333333333333336) internal successors, (106), 3 states have internal predecessors, (106), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 15:56:28,435 INFO L276 IsEmpty]: Start isEmpty. Operand 65218 states and 90245 transitions. [2023-12-02 15:56:28,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2023-12-02 15:56:28,507 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:56:28,507 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 15:56:28,512 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2023-12-02 15:56:28,707 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2023-12-02 15:56:28,707 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:56:28,708 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:56:28,708 INFO L85 PathProgramCache]: Analyzing trace with hash 1633506286, now seen corresponding path program 1 times [2023-12-02 15:56:28,708 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:56:28,708 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [142360401] [2023-12-02 15:56:28,708 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:56:28,708 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:56:28,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:56:28,965 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 18 proven. 45 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2023-12-02 15:56:28,965 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:56:28,965 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [142360401] [2023-12-02 15:56:28,965 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [142360401] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:56:28,965 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1305936585] [2023-12-02 15:56:28,965 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:56:28,965 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:56:28,966 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:56:28,967 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:56:28,985 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2023-12-02 15:56:29,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:56:29,158 INFO L262 TraceCheckSpWp]: Trace formula consists of 826 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 15:56:29,160 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:56:29,188 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 97 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-12-02 15:56:29,188 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 15:56:29,188 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1305936585] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:56:29,188 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 15:56:29,188 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-12-02 15:56:29,189 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [227543231] [2023-12-02 15:56:29,189 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:56:29,189 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 15:56:29,189 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:56:29,190 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 15:56:29,190 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 15:56:29,190 INFO L87 Difference]: Start difference. First operand 65218 states and 90245 transitions. Second operand has 3 states, 3 states have (on average 41.0) internal successors, (123), 3 states have internal predecessors, (123), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 15:56:32,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:56:32,131 INFO L93 Difference]: Finished difference Result 110926 states and 154779 transitions. [2023-12-02 15:56:32,132 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 15:56:32,132 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 41.0) internal successors, (123), 3 states have internal predecessors, (123), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 155 [2023-12-02 15:56:32,132 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:56:32,254 INFO L225 Difference]: With dead ends: 110926 [2023-12-02 15:56:32,254 INFO L226 Difference]: Without dead ends: 65318 [2023-12-02 15:56:32,414 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 157 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 15:56:32,414 INFO L413 NwaCegarLoop]: 3331 mSDtfsCounter, 148 mSDsluCounter, 3204 mSDsCounter, 0 mSdLazyCounter, 510 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 148 SdHoareTripleChecker+Valid, 6535 SdHoareTripleChecker+Invalid, 512 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 510 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 15:56:32,414 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [148 Valid, 6535 Invalid, 512 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 510 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 15:56:32,450 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65318 states. [2023-12-02 15:56:34,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65318 to 64834. [2023-12-02 15:56:34,738 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64834 states, 57243 states have (on average 1.3929563440071275) internal successors, (79737), 57343 states have internal predecessors, (79737), 4615 states have call successors, (4615), 2975 states have call predecessors, (4615), 2974 states have return successors, (4613), 4516 states have call predecessors, (4613), 4613 states have call successors, (4613) [2023-12-02 15:56:34,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64834 states to 64834 states and 88965 transitions. [2023-12-02 15:56:34,869 INFO L78 Accepts]: Start accepts. Automaton has 64834 states and 88965 transitions. Word has length 155 [2023-12-02 15:56:34,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:56:34,870 INFO L495 AbstractCegarLoop]: Abstraction has 64834 states and 88965 transitions. [2023-12-02 15:56:34,870 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 41.0) internal successors, (123), 3 states have internal predecessors, (123), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 15:56:34,870 INFO L276 IsEmpty]: Start isEmpty. Operand 64834 states and 88965 transitions. [2023-12-02 15:56:35,086 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2023-12-02 15:56:35,086 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:56:35,086 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 15:56:35,091 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2023-12-02 15:56:35,286 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:56:35,287 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:56:35,287 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:56:35,287 INFO L85 PathProgramCache]: Analyzing trace with hash -2118901264, now seen corresponding path program 1 times [2023-12-02 15:56:35,287 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:56:35,287 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1378344470] [2023-12-02 15:56:35,288 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:56:35,288 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:56:35,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:56:35,493 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 18 proven. 43 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2023-12-02 15:56:35,493 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:56:35,493 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1378344470] [2023-12-02 15:56:35,493 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1378344470] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:56:35,493 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1336348011] [2023-12-02 15:56:35,493 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:56:35,493 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:56:35,494 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:56:35,494 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:56:35,497 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2023-12-02 15:56:35,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:56:35,683 INFO L262 TraceCheckSpWp]: Trace formula consists of 832 conjuncts, 9 conjunts are in the unsatisfiable core [2023-12-02 15:56:35,685 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:56:35,765 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 71 proven. 0 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2023-12-02 15:56:35,765 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 15:56:35,766 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1336348011] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:56:35,766 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 15:56:35,766 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 10 [2023-12-02 15:56:35,766 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [148813357] [2023-12-02 15:56:35,766 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:56:35,767 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 15:56:35,767 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:56:35,767 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 15:56:35,767 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2023-12-02 15:56:35,767 INFO L87 Difference]: Start difference. First operand 64834 states and 88965 transitions. Second operand has 6 states, 6 states have (on average 17.5) internal successors, (105), 6 states have internal predecessors, (105), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 15:56:40,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:56:40,677 INFO L93 Difference]: Finished difference Result 157486 states and 214087 transitions. [2023-12-02 15:56:40,678 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-12-02 15:56:40,678 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 17.5) internal successors, (105), 6 states have internal predecessors, (105), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 155 [2023-12-02 15:56:40,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:56:40,862 INFO L225 Difference]: With dead ends: 157486 [2023-12-02 15:56:40,862 INFO L226 Difference]: Without dead ends: 94350 [2023-12-02 15:56:40,923 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 154 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2023-12-02 15:56:40,924 INFO L413 NwaCegarLoop]: 3208 mSDtfsCounter, 3718 mSDsluCounter, 6403 mSDsCounter, 0 mSdLazyCounter, 825 mSolverCounterSat, 111 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3733 SdHoareTripleChecker+Valid, 9611 SdHoareTripleChecker+Invalid, 936 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 111 IncrementalHoareTripleChecker+Valid, 825 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-12-02 15:56:40,924 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3733 Valid, 9611 Invalid, 936 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [111 Valid, 825 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-12-02 15:56:40,992 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94350 states. [2023-12-02 15:56:44,990 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94350 to 94346. [2023-12-02 15:56:45,040 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94346 states, 83051 states have (on average 1.3681352422005755) internal successors, (113625), 83199 states have internal predecessors, (113625), 6839 states have call successors, (6839), 4455 states have call predecessors, (6839), 4454 states have return successors, (6837), 6692 states have call predecessors, (6837), 6837 states have call successors, (6837) [2023-12-02 15:56:45,288 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94346 states to 94346 states and 127301 transitions. [2023-12-02 15:56:45,293 INFO L78 Accepts]: Start accepts. Automaton has 94346 states and 127301 transitions. Word has length 155 [2023-12-02 15:56:45,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:56:45,294 INFO L495 AbstractCegarLoop]: Abstraction has 94346 states and 127301 transitions. [2023-12-02 15:56:45,294 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 17.5) internal successors, (105), 6 states have internal predecessors, (105), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 15:56:45,294 INFO L276 IsEmpty]: Start isEmpty. Operand 94346 states and 127301 transitions. [2023-12-02 15:56:45,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2023-12-02 15:56:45,549 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:56:45,549 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 15:56:45,554 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2023-12-02 15:56:45,749 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:56:45,750 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:56:45,750 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:56:45,750 INFO L85 PathProgramCache]: Analyzing trace with hash -2072947106, now seen corresponding path program 1 times [2023-12-02 15:56:45,750 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:56:45,750 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1508570684] [2023-12-02 15:56:45,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:56:45,751 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:56:45,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:56:45,843 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 22 proven. 7 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2023-12-02 15:56:45,843 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:56:45,843 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1508570684] [2023-12-02 15:56:45,843 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1508570684] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:56:45,843 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1286740475] [2023-12-02 15:56:45,843 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:56:45,843 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:56:45,844 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:56:45,845 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:56:45,848 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2023-12-02 15:56:46,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:56:46,006 INFO L262 TraceCheckSpWp]: Trace formula consists of 829 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 15:56:46,008 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:56:46,026 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 80 proven. 0 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2023-12-02 15:56:46,026 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 15:56:46,026 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1286740475] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:56:46,026 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 15:56:46,027 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2023-12-02 15:56:46,027 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [335260190] [2023-12-02 15:56:46,027 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:56:46,027 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 15:56:46,027 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:56:46,028 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 15:56:46,028 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-12-02 15:56:46,028 INFO L87 Difference]: Start difference. First operand 94346 states and 127301 transitions. Second operand has 3 states, 3 states have (on average 36.666666666666664) internal successors, (110), 3 states have internal predecessors, (110), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 15:56:50,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:56:50,900 INFO L93 Difference]: Finished difference Result 181058 states and 245011 transitions. [2023-12-02 15:56:50,901 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 15:56:50,901 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 36.666666666666664) internal successors, (110), 3 states have internal predecessors, (110), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 155 [2023-12-02 15:56:50,901 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:56:51,147 INFO L225 Difference]: With dead ends: 181058 [2023-12-02 15:56:51,147 INFO L226 Difference]: Without dead ends: 119414 [2023-12-02 15:56:51,204 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 155 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-12-02 15:56:51,205 INFO L413 NwaCegarLoop]: 3326 mSDtfsCounter, 113 mSDsluCounter, 3219 mSDsCounter, 0 mSdLazyCounter, 510 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 113 SdHoareTripleChecker+Valid, 6545 SdHoareTripleChecker+Invalid, 510 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 510 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 15:56:51,205 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [113 Valid, 6545 Invalid, 510 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 510 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 15:56:51,282 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119414 states. [2023-12-02 15:56:56,235 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119414 to 111290. [2023-12-02 15:56:56,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111290 states, 98843 states have (on average 1.3797335167892517) internal successors, (136377), 98991 states have internal predecessors, (136377), 7415 states have call successors, (7415), 5031 states have call predecessors, (7415), 5030 states have return successors, (7413), 7268 states have call predecessors, (7413), 7413 states have call successors, (7413) [2023-12-02 15:56:56,528 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111290 states to 111290 states and 151205 transitions. [2023-12-02 15:56:56,531 INFO L78 Accepts]: Start accepts. Automaton has 111290 states and 151205 transitions. Word has length 155 [2023-12-02 15:56:56,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:56:56,532 INFO L495 AbstractCegarLoop]: Abstraction has 111290 states and 151205 transitions. [2023-12-02 15:56:56,532 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 36.666666666666664) internal successors, (110), 3 states have internal predecessors, (110), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 15:56:56,532 INFO L276 IsEmpty]: Start isEmpty. Operand 111290 states and 151205 transitions. [2023-12-02 15:56:56,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2023-12-02 15:56:56,654 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:56:56,654 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 15:56:56,660 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2023-12-02 15:56:56,855 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:56:56,855 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:56:56,855 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:56:56,855 INFO L85 PathProgramCache]: Analyzing trace with hash -536282679, now seen corresponding path program 1 times [2023-12-02 15:56:56,856 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:56:56,856 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1922944268] [2023-12-02 15:56:56,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:56:56,856 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:56:56,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:56:57,088 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 18 proven. 43 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2023-12-02 15:56:57,088 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:56:57,088 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1922944268] [2023-12-02 15:56:57,088 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1922944268] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:56:57,088 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [691867510] [2023-12-02 15:56:57,088 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:56:57,088 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:56:57,089 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:56:57,090 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:56:57,092 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2023-12-02 15:56:57,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:56:57,266 INFO L262 TraceCheckSpWp]: Trace formula consists of 844 conjuncts, 9 conjunts are in the unsatisfiable core [2023-12-02 15:56:57,270 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:56:57,589 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 64 proven. 0 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2023-12-02 15:56:57,590 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 15:56:57,590 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [691867510] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:56:57,590 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 15:56:57,590 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 10 [2023-12-02 15:56:57,590 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [366398131] [2023-12-02 15:56:57,590 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:56:57,591 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 15:56:57,591 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:56:57,591 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 15:56:57,592 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2023-12-02 15:56:57,592 INFO L87 Difference]: Start difference. First operand 111290 states and 151205 transitions. Second operand has 6 states, 6 states have (on average 16.833333333333332) internal successors, (101), 6 states have internal predecessors, (101), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 15:57:05,711 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:57:05,711 INFO L93 Difference]: Finished difference Result 271586 states and 366291 transitions. [2023-12-02 15:57:05,711 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-12-02 15:57:05,712 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 16.833333333333332) internal successors, (101), 6 states have internal predecessors, (101), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 159 [2023-12-02 15:57:05,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:57:06,035 INFO L225 Difference]: With dead ends: 271586 [2023-12-02 15:57:06,035 INFO L226 Difference]: Without dead ends: 161994 [2023-12-02 15:57:06,121 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 158 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2023-12-02 15:57:06,122 INFO L413 NwaCegarLoop]: 3204 mSDtfsCounter, 7120 mSDsluCounter, 6330 mSDsCounter, 0 mSdLazyCounter, 788 mSolverCounterSat, 156 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7135 SdHoareTripleChecker+Valid, 9534 SdHoareTripleChecker+Invalid, 944 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 156 IncrementalHoareTripleChecker+Valid, 788 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-12-02 15:57:06,122 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7135 Valid, 9534 Invalid, 944 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [156 Valid, 788 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-12-02 15:57:06,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161994 states. [2023-12-02 15:57:13,198 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161994 to 161990. [2023-12-02 15:57:13,266 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 161990 states, 143455 states have (on average 1.353156041964379) internal successors, (194117), 143675 states have internal predecessors, (194117), 10999 states have call successors, (10999), 7535 states have call predecessors, (10999), 7534 states have return successors, (10997), 10780 states have call predecessors, (10997), 10997 states have call successors, (10997) [2023-12-02 15:57:13,622 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 161990 states to 161990 states and 216113 transitions. [2023-12-02 15:57:13,626 INFO L78 Accepts]: Start accepts. Automaton has 161990 states and 216113 transitions. Word has length 159 [2023-12-02 15:57:13,627 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:57:13,627 INFO L495 AbstractCegarLoop]: Abstraction has 161990 states and 216113 transitions. [2023-12-02 15:57:13,627 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 16.833333333333332) internal successors, (101), 6 states have internal predecessors, (101), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 15:57:13,627 INFO L276 IsEmpty]: Start isEmpty. Operand 161990 states and 216113 transitions. [2023-12-02 15:57:13,826 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2023-12-02 15:57:13,826 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:57:13,827 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 15:57:13,833 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2023-12-02 15:57:14,027 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:57:14,027 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:57:14,028 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:57:14,028 INFO L85 PathProgramCache]: Analyzing trace with hash -1283153261, now seen corresponding path program 1 times [2023-12-02 15:57:14,028 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:57:14,028 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [298283263] [2023-12-02 15:57:14,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:57:14,028 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:57:14,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:57:14,189 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 20 proven. 43 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2023-12-02 15:57:14,189 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:57:14,189 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [298283263] [2023-12-02 15:57:14,189 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [298283263] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:57:14,189 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [868219651] [2023-12-02 15:57:14,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:57:14,190 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:57:14,190 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:57:14,191 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:57:14,191 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2023-12-02 15:57:14,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:57:14,346 INFO L262 TraceCheckSpWp]: Trace formula consists of 856 conjuncts, 9 conjunts are in the unsatisfiable core [2023-12-02 15:57:14,349 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:57:14,425 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 76 proven. 0 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2023-12-02 15:57:14,425 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 15:57:14,426 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [868219651] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:57:14,426 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 15:57:14,426 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 10 [2023-12-02 15:57:14,426 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [229410816] [2023-12-02 15:57:14,426 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:57:14,426 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 15:57:14,427 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:57:14,427 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 15:57:14,427 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2023-12-02 15:57:14,427 INFO L87 Difference]: Start difference. First operand 161990 states and 216113 transitions. Second operand has 6 states, 5 states have (on average 22.8) internal successors, (114), 6 states have internal predecessors, (114), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 15:57:25,626 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:57:25,626 INFO L93 Difference]: Finished difference Result 381602 states and 507219 transitions. [2023-12-02 15:57:25,627 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-12-02 15:57:25,627 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 22.8) internal successors, (114), 6 states have internal predecessors, (114), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 163 [2023-12-02 15:57:25,627 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:57:26,318 INFO L225 Difference]: With dead ends: 381602 [2023-12-02 15:57:26,318 INFO L226 Difference]: Without dead ends: 221310 [2023-12-02 15:57:26,450 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 162 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2023-12-02 15:57:26,451 INFO L413 NwaCegarLoop]: 3208 mSDtfsCounter, 7047 mSDsluCounter, 6323 mSDsCounter, 0 mSdLazyCounter, 788 mSolverCounterSat, 128 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7062 SdHoareTripleChecker+Valid, 9531 SdHoareTripleChecker+Invalid, 916 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 128 IncrementalHoareTripleChecker+Valid, 788 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-12-02 15:57:26,451 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7062 Valid, 9531 Invalid, 916 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [128 Valid, 788 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-12-02 15:57:26,580 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 221310 states. [2023-12-02 15:57:37,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 221310 to 221306. [2023-12-02 15:57:37,616 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 221306 states, 194861 states have (on average 1.3376766002432503) internal successors, (260661), 195189 states have internal predecessors, (260661), 15737 states have call successors, (15737), 10707 states have call predecessors, (15737), 10706 states have return successors, (15735), 15410 states have call predecessors, (15735), 15735 states have call successors, (15735) [2023-12-02 15:57:38,183 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 221306 states to 221306 states and 292133 transitions. [2023-12-02 15:57:38,195 INFO L78 Accepts]: Start accepts. Automaton has 221306 states and 292133 transitions. Word has length 163 [2023-12-02 15:57:38,195 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:57:38,195 INFO L495 AbstractCegarLoop]: Abstraction has 221306 states and 292133 transitions. [2023-12-02 15:57:38,195 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 22.8) internal successors, (114), 6 states have internal predecessors, (114), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 15:57:38,195 INFO L276 IsEmpty]: Start isEmpty. Operand 221306 states and 292133 transitions. [2023-12-02 15:57:38,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2023-12-02 15:57:38,448 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:57:38,448 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 15:57:38,453 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2023-12-02 15:57:38,648 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2023-12-02 15:57:38,649 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:57:38,649 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:57:38,649 INFO L85 PathProgramCache]: Analyzing trace with hash 1957777933, now seen corresponding path program 1 times [2023-12-02 15:57:38,649 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:57:38,649 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1257286267] [2023-12-02 15:57:38,649 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:57:38,649 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:57:38,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:57:39,124 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 20 proven. 43 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2023-12-02 15:57:39,124 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:57:39,124 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1257286267] [2023-12-02 15:57:39,125 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1257286267] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:57:39,125 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [20334638] [2023-12-02 15:57:39,125 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:57:39,125 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:57:39,125 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:57:39,126 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:57:39,129 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2023-12-02 15:57:39,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:57:39,284 INFO L262 TraceCheckSpWp]: Trace formula consists of 868 conjuncts, 9 conjunts are in the unsatisfiable core [2023-12-02 15:57:39,287 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:57:39,360 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 67 proven. 0 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2023-12-02 15:57:39,360 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 15:57:39,361 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [20334638] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:57:39,361 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 15:57:39,361 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 7 [2023-12-02 15:57:39,361 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1949225471] [2023-12-02 15:57:39,361 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:57:39,361 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 15:57:39,361 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:57:39,362 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 15:57:39,362 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2023-12-02 15:57:39,362 INFO L87 Difference]: Start difference. First operand 221306 states and 292133 transitions. Second operand has 6 states, 6 states have (on average 18.0) internal successors, (108), 6 states have internal predecessors, (108), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 15:57:56,975 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:57:56,975 INFO L93 Difference]: Finished difference Result 542477 states and 711897 transitions. [2023-12-02 15:57:56,976 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-12-02 15:57:56,976 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 18.0) internal successors, (108), 6 states have internal predecessors, (108), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 167 [2023-12-02 15:57:56,976 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:57:57,821 INFO L225 Difference]: With dead ends: 542477 [2023-12-02 15:57:57,821 INFO L226 Difference]: Without dead ends: 322869 [2023-12-02 15:57:58,199 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 169 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2023-12-02 15:57:58,199 INFO L413 NwaCegarLoop]: 3203 mSDtfsCounter, 7115 mSDsluCounter, 6325 mSDsCounter, 0 mSdLazyCounter, 785 mSolverCounterSat, 160 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7130 SdHoareTripleChecker+Valid, 9528 SdHoareTripleChecker+Invalid, 945 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 160 IncrementalHoareTripleChecker+Valid, 785 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-12-02 15:57:58,200 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7130 Valid, 9528 Invalid, 945 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [160 Valid, 785 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-12-02 15:57:58,407 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 322869 states. [2023-12-02 15:58:15,397 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 322869 to 322865. [2023-12-02 15:58:15,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 322865 states, 283516 states have (on average 1.311541500303334) internal successors, (371843), 284006 states have internal predecessors, (371843), 23323 states have call successors, (23323), 16025 states have call predecessors, (23323), 16024 states have return successors, (23321), 22834 states have call predecessors, (23321), 23321 states have call successors, (23321) [2023-12-02 15:58:16,599 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 322865 states to 322865 states and 418487 transitions. [2023-12-02 15:58:16,611 INFO L78 Accepts]: Start accepts. Automaton has 322865 states and 418487 transitions. Word has length 167 [2023-12-02 15:58:16,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:58:16,611 INFO L495 AbstractCegarLoop]: Abstraction has 322865 states and 418487 transitions. [2023-12-02 15:58:16,611 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 18.0) internal successors, (108), 6 states have internal predecessors, (108), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 15:58:16,611 INFO L276 IsEmpty]: Start isEmpty. Operand 322865 states and 418487 transitions. [2023-12-02 15:58:16,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 172 [2023-12-02 15:58:16,971 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:58:16,971 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 15:58:16,977 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2023-12-02 15:58:17,172 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2023-12-02 15:58:17,172 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:58:17,172 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:58:17,172 INFO L85 PathProgramCache]: Analyzing trace with hash -731344189, now seen corresponding path program 1 times [2023-12-02 15:58:17,172 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:58:17,172 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1622198899] [2023-12-02 15:58:17,173 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:58:17,173 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:58:17,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:58:17,313 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 50 proven. 23 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2023-12-02 15:58:17,313 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:58:17,313 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1622198899] [2023-12-02 15:58:17,313 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1622198899] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:58:17,313 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [455203675] [2023-12-02 15:58:17,314 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:58:17,314 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:58:17,314 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:58:17,315 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:58:17,317 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2023-12-02 15:58:17,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:58:17,493 INFO L262 TraceCheckSpWp]: Trace formula consists of 880 conjuncts, 6 conjunts are in the unsatisfiable core [2023-12-02 15:58:17,497 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:58:17,562 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 102 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-12-02 15:58:17,893 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 15:58:17,893 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [455203675] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:58:17,893 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 15:58:17,893 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 6 [2023-12-02 15:58:17,893 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1261322577] [2023-12-02 15:58:17,893 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:58:17,894 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 15:58:17,894 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:58:17,894 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 15:58:17,894 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 15:58:17,894 INFO L87 Difference]: Start difference. First operand 322865 states and 418487 transitions. Second operand has 3 states, 3 states have (on average 47.0) internal successors, (141), 3 states have internal predecessors, (141), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 15:58:36,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:58:36,993 INFO L93 Difference]: Finished difference Result 593031 states and 771872 transitions. [2023-12-02 15:58:36,993 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 15:58:36,994 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 47.0) internal successors, (141), 3 states have internal predecessors, (141), 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 171 [2023-12-02 15:58:36,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:58:37,981 INFO L225 Difference]: With dead ends: 593031 [2023-12-02 15:58:37,981 INFO L226 Difference]: Without dead ends: 365609 [2023-12-02 15:58:38,215 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 173 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 15:58:38,216 INFO L413 NwaCegarLoop]: 3233 mSDtfsCounter, 3388 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 262 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3388 SdHoareTripleChecker+Valid, 3279 SdHoareTripleChecker+Invalid, 266 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 262 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 15:58:38,216 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3388 Valid, 3279 Invalid, 266 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 262 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 15:58:38,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 365609 states. [2023-12-02 15:58:57,528 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 365609 to 363277. [2023-12-02 15:58:57,701 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 363277 states, 321625 states have (on average 1.2960342013214148) internal successors, (416837), 322115 states have internal predecessors, (416837), 23745 states have call successors, (23745), 17906 states have call predecessors, (23745), 17905 states have return successors, (25331), 23256 states have call predecessors, (25331), 23743 states have call successors, (25331) [2023-12-02 15:58:58,981 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 363277 states to 363277 states and 465913 transitions. [2023-12-02 15:58:58,988 INFO L78 Accepts]: Start accepts. Automaton has 363277 states and 465913 transitions. Word has length 171 [2023-12-02 15:58:58,988 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:58:58,988 INFO L495 AbstractCegarLoop]: Abstraction has 363277 states and 465913 transitions. [2023-12-02 15:58:58,988 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 47.0) internal successors, (141), 3 states have internal predecessors, (141), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 15:58:58,988 INFO L276 IsEmpty]: Start isEmpty. Operand 363277 states and 465913 transitions. [2023-12-02 15:58:59,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2023-12-02 15:58:59,378 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:58:59,379 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 15:58:59,384 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2023-12-02 15:58:59,579 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2023-12-02 15:58:59,579 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:58:59,579 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:58:59,579 INFO L85 PathProgramCache]: Analyzing trace with hash 451360679, now seen corresponding path program 1 times [2023-12-02 15:58:59,580 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:58:59,580 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1560785543] [2023-12-02 15:58:59,580 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:58:59,580 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:58:59,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:58:59,769 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 63 proven. 26 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2023-12-02 15:58:59,769 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:58:59,769 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1560785543] [2023-12-02 15:58:59,769 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1560785543] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:58:59,769 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2061748411] [2023-12-02 15:58:59,769 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:58:59,770 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:58:59,770 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:58:59,770 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:58:59,776 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24b6406e-c86d-4bb3-b1f5-8eaa15c2b68b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2023-12-02 15:58:59,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:58:59,960 INFO L262 TraceCheckSpWp]: Trace formula consists of 878 conjuncts, 22 conjunts are in the unsatisfiable core [2023-12-02 15:58:59,964 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:59:00,030 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 117 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 15:59:00,030 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 15:59:00,031 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2061748411] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:59:00,031 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 15:59:00,031 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [5] total 6 [2023-12-02 15:59:00,031 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1980135373] [2023-12-02 15:59:00,031 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:59:00,031 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 15:59:00,032 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:59:00,032 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 15:59:00,032 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-12-02 15:59:00,032 INFO L87 Difference]: Start difference. First operand 363277 states and 465913 transitions. Second operand has 6 states, 6 states have (on average 25.0) internal successors, (150), 6 states have internal predecessors, (150), 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)