./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/eca-rers2012/Problem03_label12.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_66ba2723-afc8-4c4b-87fa-7dce968db381/bin/utaipan-verify-nQ1chXbOIh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66ba2723-afc8-4c4b-87fa-7dce968db381/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_66ba2723-afc8-4c4b-87fa-7dce968db381/bin/utaipan-verify-nQ1chXbOIh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66ba2723-afc8-4c4b-87fa-7dce968db381/bin/utaipan-verify-nQ1chXbOIh/config/TaipanReach.xml -i ../../sv-benchmarks/c/eca-rers2012/Problem03_label12.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66ba2723-afc8-4c4b-87fa-7dce968db381/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_66ba2723-afc8-4c4b-87fa-7dce968db381/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 8d17ef4c86a3b9aaad0f3756316af6b356203f50f5a16d9fd49cf45964daad71 --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-12-02 15:59:27,124 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-12-02 15:59:27,189 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66ba2723-afc8-4c4b-87fa-7dce968db381/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-12-02 15:59:27,193 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-12-02 15:59:27,194 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-12-02 15:59:27,218 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-12-02 15:59:27,219 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-12-02 15:59:27,219 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-12-02 15:59:27,220 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-12-02 15:59:27,221 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-12-02 15:59:27,221 INFO L153 SettingsManager]: * User list type=DISABLED [2023-12-02 15:59:27,222 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-12-02 15:59:27,222 INFO L153 SettingsManager]: * Explicit value domain=true [2023-12-02 15:59:27,223 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-12-02 15:59:27,223 INFO L153 SettingsManager]: * Octagon Domain=false [2023-12-02 15:59:27,224 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-12-02 15:59:27,224 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-12-02 15:59:27,225 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-12-02 15:59:27,225 INFO L153 SettingsManager]: * Interval Domain=false [2023-12-02 15:59:27,226 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-12-02 15:59:27,226 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-12-02 15:59:27,227 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-12-02 15:59:27,228 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-12-02 15:59:27,228 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-12-02 15:59:27,229 INFO L153 SettingsManager]: * sizeof long=4 [2023-12-02 15:59:27,229 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-12-02 15:59:27,229 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-12-02 15:59:27,230 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-12-02 15:59:27,230 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-12-02 15:59:27,231 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-12-02 15:59:27,231 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-12-02 15:59:27,231 INFO L153 SettingsManager]: * sizeof long double=12 [2023-12-02 15:59:27,232 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-12-02 15:59:27,232 INFO L153 SettingsManager]: * Use constant arrays=true [2023-12-02 15:59:27,232 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-12-02 15:59:27,232 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-12-02 15:59:27,232 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-12-02 15:59:27,233 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 15:59:27,233 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-12-02 15:59:27,233 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-12-02 15:59:27,233 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-12-02 15:59:27,234 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-12-02 15:59:27,234 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-12-02 15:59:27,234 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-12-02 15:59:27,234 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-12-02 15:59:27,234 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-12-02 15:59:27,235 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-12-02 15:59:27,235 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_66ba2723-afc8-4c4b-87fa-7dce968db381/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66ba2723-afc8-4c4b-87fa-7dce968db381/bin/utaipan-verify-nQ1chXbOIh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 8d17ef4c86a3b9aaad0f3756316af6b356203f50f5a16d9fd49cf45964daad71 [2023-12-02 15:59:27,454 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-12-02 15:59:27,475 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-12-02 15:59:27,477 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-12-02 15:59:27,478 INFO L270 PluginConnector]: Initializing CDTParser... [2023-12-02 15:59:27,479 INFO L274 PluginConnector]: CDTParser initialized [2023-12-02 15:59:27,480 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66ba2723-afc8-4c4b-87fa-7dce968db381/bin/utaipan-verify-nQ1chXbOIh/../../sv-benchmarks/c/eca-rers2012/Problem03_label12.c [2023-12-02 15:59:30,251 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-12-02 15:59:30,581 INFO L384 CDTParser]: Found 1 translation units. [2023-12-02 15:59:30,582 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66ba2723-afc8-4c4b-87fa-7dce968db381/sv-benchmarks/c/eca-rers2012/Problem03_label12.c [2023-12-02 15:59:30,597 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66ba2723-afc8-4c4b-87fa-7dce968db381/bin/utaipan-verify-nQ1chXbOIh/data/062620d02/88f34b47d80b4a2d98b88bb34b96bba7/FLAGd35f44a2b [2023-12-02 15:59:30,609 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66ba2723-afc8-4c4b-87fa-7dce968db381/bin/utaipan-verify-nQ1chXbOIh/data/062620d02/88f34b47d80b4a2d98b88bb34b96bba7 [2023-12-02 15:59:30,611 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-12-02 15:59:30,612 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-12-02 15:59:30,613 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-12-02 15:59:30,613 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-12-02 15:59:30,617 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-12-02 15:59:30,618 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 03:59:30" (1/1) ... [2023-12-02 15:59:30,619 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@50767ff0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:59:30, skipping insertion in model container [2023-12-02 15:59:30,619 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 03:59:30" (1/1) ... [2023-12-02 15:59:30,700 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-12-02 15:59:31,128 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_66ba2723-afc8-4c4b-87fa-7dce968db381/sv-benchmarks/c/eca-rers2012/Problem03_label12.c[56222,56235] [2023-12-02 15:59:31,168 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 15:59:31,180 INFO L202 MainTranslator]: Completed pre-run [2023-12-02 15:59:31,435 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_66ba2723-afc8-4c4b-87fa-7dce968db381/sv-benchmarks/c/eca-rers2012/Problem03_label12.c[56222,56235] [2023-12-02 15:59:31,451 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 15:59:31,470 INFO L206 MainTranslator]: Completed translation [2023-12-02 15:59:31,470 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:59:31 WrapperNode [2023-12-02 15:59:31,470 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-12-02 15:59:31,471 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-12-02 15:59:31,471 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-12-02 15:59:31,472 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-12-02 15:59:31,478 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:59:31" (1/1) ... [2023-12-02 15:59:31,508 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:59:31" (1/1) ... [2023-12-02 15:59:31,583 INFO L138 Inliner]: procedures = 14, calls = 8, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 1772 [2023-12-02 15:59:31,584 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-12-02 15:59:31,585 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-12-02 15:59:31,585 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-12-02 15:59:31,585 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-12-02 15:59:31,594 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:59:31" (1/1) ... [2023-12-02 15:59:31,594 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:59:31" (1/1) ... [2023-12-02 15:59:31,601 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:59:31" (1/1) ... [2023-12-02 15:59:31,601 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:59:31" (1/1) ... [2023-12-02 15:59:31,645 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:59:31" (1/1) ... [2023-12-02 15:59:31,656 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:59:31" (1/1) ... [2023-12-02 15:59:31,675 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:59:31" (1/1) ... [2023-12-02 15:59:31,685 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:59:31" (1/1) ... [2023-12-02 15:59:31,699 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-12-02 15:59:31,700 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-12-02 15:59:31,700 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-12-02 15:59:31,700 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-12-02 15:59:31,701 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:59:31" (1/1) ... [2023-12-02 15:59:31,706 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 15:59:31,717 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66ba2723-afc8-4c4b-87fa-7dce968db381/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:59:31,728 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66ba2723-afc8-4c4b-87fa-7dce968db381/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-12-02 15:59:31,731 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66ba2723-afc8-4c4b-87fa-7dce968db381/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-12-02 15:59:31,760 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-12-02 15:59:31,761 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-12-02 15:59:31,761 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-12-02 15:59:31,761 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-12-02 15:59:31,843 INFO L241 CfgBuilder]: Building ICFG [2023-12-02 15:59:31,844 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-12-02 15:59:33,611 INFO L282 CfgBuilder]: Performing block encoding [2023-12-02 15:59:33,991 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-12-02 15:59:33,991 INFO L309 CfgBuilder]: Removed 1 assume(true) statements. [2023-12-02 15:59:33,992 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 03:59:33 BoogieIcfgContainer [2023-12-02 15:59:33,993 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-12-02 15:59:33,995 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-12-02 15:59:33,995 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-12-02 15:59:33,998 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-12-02 15:59:33,998 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.12 03:59:30" (1/3) ... [2023-12-02 15:59:33,999 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4bd794b5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 03:59:33, skipping insertion in model container [2023-12-02 15:59:33,999 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:59:31" (2/3) ... [2023-12-02 15:59:34,000 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4bd794b5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 03:59:33, skipping insertion in model container [2023-12-02 15:59:34,000 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 03:59:33" (3/3) ... [2023-12-02 15:59:34,001 INFO L112 eAbstractionObserver]: Analyzing ICFG Problem03_label12.c [2023-12-02 15:59:34,019 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-12-02 15:59:34,020 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-12-02 15:59:34,072 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-12-02 15:59:34,079 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;@584302a7, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-12-02 15:59:34,079 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-12-02 15:59:34,085 INFO L276 IsEmpty]: Start isEmpty. Operand has 148 states, 146 states have (on average 1.9726027397260273) internal successors, (288), 147 states have internal predecessors, (288), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:59:34,099 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2023-12-02 15:59:34,099 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:59:34,100 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 15:59:34,101 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:59:34,106 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:59:34,106 INFO L85 PathProgramCache]: Analyzing trace with hash 1290439282, now seen corresponding path program 1 times [2023-12-02 15:59:34,116 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:59:34,116 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [538905831] [2023-12-02 15:59:34,116 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:59:34,117 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:59:34,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:59:34,922 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 15:59:34,922 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:59:34,922 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [538905831] [2023-12-02 15:59:34,923 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [538905831] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:59:34,923 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 15:59:34,924 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-12-02 15:59:34,925 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [806420374] [2023-12-02 15:59:34,926 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:59:34,930 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 15:59:34,931 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:59:34,959 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 15:59:34,959 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 15:59:34,962 INFO L87 Difference]: Start difference. First operand has 148 states, 146 states have (on average 1.9726027397260273) internal successors, (288), 147 states have internal predecessors, (288), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 47.666666666666664) internal successors, (143), 2 states have internal predecessors, (143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:59:35,943 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:59:35,943 INFO L93 Difference]: Finished difference Result 440 states and 860 transitions. [2023-12-02 15:59:35,945 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 15:59:35,946 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 47.666666666666664) internal successors, (143), 2 states have internal predecessors, (143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 143 [2023-12-02 15:59:35,947 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:59:35,957 INFO L225 Difference]: With dead ends: 440 [2023-12-02 15:59:35,957 INFO L226 Difference]: Without dead ends: 289 [2023-12-02 15:59:35,960 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 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 15:59:35,965 INFO L413 NwaCegarLoop]: 45 mSDtfsCounter, 31 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 471 mSolverCounterSat, 126 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 50 SdHoareTripleChecker+Invalid, 597 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 126 IncrementalHoareTripleChecker+Valid, 471 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2023-12-02 15:59:35,966 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [31 Valid, 50 Invalid, 597 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [126 Valid, 471 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2023-12-02 15:59:35,981 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 289 states. [2023-12-02 15:59:36,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 289 to 289. [2023-12-02 15:59:36,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 289 states, 288 states have (on average 1.8125) internal successors, (522), 288 states have internal predecessors, (522), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:59:36,020 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 289 states to 289 states and 522 transitions. [2023-12-02 15:59:36,021 INFO L78 Accepts]: Start accepts. Automaton has 289 states and 522 transitions. Word has length 143 [2023-12-02 15:59:36,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:59:36,022 INFO L495 AbstractCegarLoop]: Abstraction has 289 states and 522 transitions. [2023-12-02 15:59:36,023 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 47.666666666666664) internal successors, (143), 2 states have internal predecessors, (143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:59:36,023 INFO L276 IsEmpty]: Start isEmpty. Operand 289 states and 522 transitions. [2023-12-02 15:59:36,026 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2023-12-02 15:59:36,027 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:59:36,027 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 15:59:36,027 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-12-02 15:59:36,028 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:59:36,028 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:59:36,029 INFO L85 PathProgramCache]: Analyzing trace with hash -767478068, now seen corresponding path program 1 times [2023-12-02 15:59:36,029 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:59:36,029 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [13298058] [2023-12-02 15:59:36,030 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:59:36,030 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:59:36,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:59:36,449 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 15:59:36,449 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:59:36,450 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [13298058] [2023-12-02 15:59:36,450 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [13298058] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:59:36,450 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 15:59:36,450 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-12-02 15:59:36,450 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1644972087] [2023-12-02 15:59:36,450 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:59:36,452 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 15:59:36,452 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:59:36,453 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 15:59:36,453 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 15:59:36,453 INFO L87 Difference]: Start difference. First operand 289 states and 522 transitions. Second operand has 3 states, 3 states have (on average 51.0) internal successors, (153), 2 states have internal predecessors, (153), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:59:37,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:59:37,152 INFO L93 Difference]: Finished difference Result 863 states and 1563 transitions. [2023-12-02 15:59:37,152 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 15:59:37,153 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 51.0) internal successors, (153), 2 states have internal predecessors, (153), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 153 [2023-12-02 15:59:37,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:59:37,157 INFO L225 Difference]: With dead ends: 863 [2023-12-02 15:59:37,158 INFO L226 Difference]: Without dead ends: 575 [2023-12-02 15:59:37,160 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 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 15:59:37,161 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 157 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 455 mSolverCounterSat, 168 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 157 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 623 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 168 IncrementalHoareTripleChecker+Valid, 455 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-12-02 15:59:37,162 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [157 Valid, 33 Invalid, 623 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [168 Valid, 455 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-12-02 15:59:37,163 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 575 states. [2023-12-02 15:59:37,193 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 575 to 575. [2023-12-02 15:59:37,194 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 575 states, 574 states have (on average 1.6986062717770034) internal successors, (975), 574 states have internal predecessors, (975), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:59:37,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 575 states to 575 states and 975 transitions. [2023-12-02 15:59:37,197 INFO L78 Accepts]: Start accepts. Automaton has 575 states and 975 transitions. Word has length 153 [2023-12-02 15:59:37,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:59:37,198 INFO L495 AbstractCegarLoop]: Abstraction has 575 states and 975 transitions. [2023-12-02 15:59:37,198 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 51.0) internal successors, (153), 2 states have internal predecessors, (153), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:59:37,198 INFO L276 IsEmpty]: Start isEmpty. Operand 575 states and 975 transitions. [2023-12-02 15:59:37,203 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2023-12-02 15:59:37,204 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:59:37,204 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 15:59:37,204 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-12-02 15:59:37,205 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:59:37,205 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:59:37,205 INFO L85 PathProgramCache]: Analyzing trace with hash 59620743, now seen corresponding path program 1 times [2023-12-02 15:59:37,205 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:59:37,206 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [467266081] [2023-12-02 15:59:37,206 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:59:37,206 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:59:37,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:59:37,554 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 15:59:37,555 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:59:37,555 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [467266081] [2023-12-02 15:59:37,555 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [467266081] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:59:37,555 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 15:59:37,556 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-12-02 15:59:37,556 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1597897046] [2023-12-02 15:59:37,556 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:59:37,557 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 15:59:37,557 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:59:37,558 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 15:59:37,558 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 15:59:37,558 INFO L87 Difference]: Start difference. First operand 575 states and 975 transitions. Second operand has 3 states, 3 states have (on average 51.666666666666664) internal successors, (155), 2 states have internal predecessors, (155), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:59:38,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:59:38,272 INFO L93 Difference]: Finished difference Result 1723 states and 2923 transitions. [2023-12-02 15:59:38,272 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 15:59:38,272 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 51.666666666666664) internal successors, (155), 2 states have internal predecessors, (155), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 155 [2023-12-02 15:59:38,272 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:59:38,279 INFO L225 Difference]: With dead ends: 1723 [2023-12-02 15:59:38,280 INFO L226 Difference]: Without dead ends: 1149 [2023-12-02 15:59:38,281 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 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 15:59:38,283 INFO L413 NwaCegarLoop]: 50 mSDtfsCounter, 183 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 560 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 183 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 583 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 560 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-12-02 15:59:38,283 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [183 Valid, 54 Invalid, 583 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 560 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-12-02 15:59:38,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1149 states. [2023-12-02 15:59:38,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1149 to 1147. [2023-12-02 15:59:38,316 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1147 states, 1146 states have (on average 1.6657940663176265) internal successors, (1909), 1146 states have internal predecessors, (1909), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:59:38,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1147 states to 1147 states and 1909 transitions. [2023-12-02 15:59:38,322 INFO L78 Accepts]: Start accepts. Automaton has 1147 states and 1909 transitions. Word has length 155 [2023-12-02 15:59:38,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:59:38,323 INFO L495 AbstractCegarLoop]: Abstraction has 1147 states and 1909 transitions. [2023-12-02 15:59:38,323 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 51.666666666666664) internal successors, (155), 2 states have internal predecessors, (155), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:59:38,323 INFO L276 IsEmpty]: Start isEmpty. Operand 1147 states and 1909 transitions. [2023-12-02 15:59:38,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2023-12-02 15:59:38,327 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:59:38,328 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 15:59:38,328 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-12-02 15:59:38,328 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:59:38,329 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:59:38,329 INFO L85 PathProgramCache]: Analyzing trace with hash 2140371085, now seen corresponding path program 1 times [2023-12-02 15:59:38,329 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:59:38,330 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [103149167] [2023-12-02 15:59:38,330 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:59:38,330 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:59:38,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:59:38,630 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 15:59:38,631 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:59:38,631 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [103149167] [2023-12-02 15:59:38,631 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [103149167] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:59:38,631 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 15:59:38,631 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-12-02 15:59:38,632 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1918219925] [2023-12-02 15:59:38,632 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:59:38,632 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 15:59:38,632 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:59:38,633 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 15:59:38,633 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 15:59:38,633 INFO L87 Difference]: Start difference. First operand 1147 states and 1909 transitions. Second operand has 3 states, 3 states have (on average 52.666666666666664) internal successors, (158), 2 states have internal predecessors, (158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:59:39,431 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:59:39,431 INFO L93 Difference]: Finished difference Result 3437 states and 5724 transitions. [2023-12-02 15:59:39,432 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 15:59:39,432 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 52.666666666666664) internal successors, (158), 2 states have internal predecessors, (158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 158 [2023-12-02 15:59:39,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:59:39,445 INFO L225 Difference]: With dead ends: 3437 [2023-12-02 15:59:39,446 INFO L226 Difference]: Without dead ends: 2291 [2023-12-02 15:59:39,448 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 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 15:59:39,449 INFO L413 NwaCegarLoop]: 46 mSDtfsCounter, 155 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 457 mSolverCounterSat, 142 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 155 SdHoareTripleChecker+Valid, 50 SdHoareTripleChecker+Invalid, 599 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 142 IncrementalHoareTripleChecker+Valid, 457 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-12-02 15:59:39,450 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [155 Valid, 50 Invalid, 599 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [142 Valid, 457 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-12-02 15:59:39,453 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2291 states. [2023-12-02 15:59:39,513 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2291 to 2291. [2023-12-02 15:59:39,518 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2291 states, 2290 states have (on average 1.57117903930131) internal successors, (3598), 2290 states have internal predecessors, (3598), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:59:39,531 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2291 states to 2291 states and 3598 transitions. [2023-12-02 15:59:39,531 INFO L78 Accepts]: Start accepts. Automaton has 2291 states and 3598 transitions. Word has length 158 [2023-12-02 15:59:39,531 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:59:39,531 INFO L495 AbstractCegarLoop]: Abstraction has 2291 states and 3598 transitions. [2023-12-02 15:59:39,532 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 52.666666666666664) internal successors, (158), 2 states have internal predecessors, (158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:59:39,532 INFO L276 IsEmpty]: Start isEmpty. Operand 2291 states and 3598 transitions. [2023-12-02 15:59:39,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2023-12-02 15:59:39,540 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:59:39,540 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 15:59:39,540 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-12-02 15:59:39,540 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:59:39,541 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:59:39,541 INFO L85 PathProgramCache]: Analyzing trace with hash 73100515, now seen corresponding path program 1 times [2023-12-02 15:59:39,541 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:59:39,542 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1814791193] [2023-12-02 15:59:39,542 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:59:39,542 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:59:39,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:59:39,827 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 19 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 15:59:39,827 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:59:39,828 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1814791193] [2023-12-02 15:59:39,828 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1814791193] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:59:39,828 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [468075960] [2023-12-02 15:59:39,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:59:39,829 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:59:39,829 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66ba2723-afc8-4c4b-87fa-7dce968db381/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:59:39,832 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66ba2723-afc8-4c4b-87fa-7dce968db381/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:59:39,840 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66ba2723-afc8-4c4b-87fa-7dce968db381/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-12-02 15:59:40,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:59:40,021 INFO L262 TraceCheckSpWp]: Trace formula consists of 376 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 15:59:40,031 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:59:40,088 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 19 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-12-02 15:59:40,088 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 15:59:40,088 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [468075960] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:59:40,089 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 15:59:40,089 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [3] total 4 [2023-12-02 15:59:40,089 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [487433035] [2023-12-02 15:59:40,089 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:59:40,090 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 15:59:40,090 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:59:40,091 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 15:59:40,091 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-12-02 15:59:40,091 INFO L87 Difference]: Start difference. First operand 2291 states and 3598 transitions. Second operand has 3 states, 3 states have (on average 52.666666666666664) internal successors, (158), 2 states have internal predecessors, (158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:59:40,919 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:59:40,919 INFO L93 Difference]: Finished difference Result 6871 states and 10792 transitions. [2023-12-02 15:59:40,920 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 15:59:40,920 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 52.666666666666664) internal successors, (158), 2 states have internal predecessors, (158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 163 [2023-12-02 15:59:40,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:59:40,945 INFO L225 Difference]: With dead ends: 6871 [2023-12-02 15:59:40,946 INFO L226 Difference]: Without dead ends: 4581 [2023-12-02 15:59:40,949 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 162 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-12-02 15:59:40,950 INFO L413 NwaCegarLoop]: 52 mSDtfsCounter, 156 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 497 mSolverCounterSat, 91 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 156 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 588 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 91 IncrementalHoareTripleChecker+Valid, 497 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2023-12-02 15:59:40,951 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [156 Valid, 56 Invalid, 588 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [91 Valid, 497 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2023-12-02 15:59:40,956 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4581 states. [2023-12-02 15:59:41,047 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4581 to 4579. [2023-12-02 15:59:41,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4579 states, 4578 states have (on average 1.494102228047182) internal successors, (6840), 4578 states have internal predecessors, (6840), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:59:41,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4579 states to 4579 states and 6840 transitions. [2023-12-02 15:59:41,077 INFO L78 Accepts]: Start accepts. Automaton has 4579 states and 6840 transitions. Word has length 163 [2023-12-02 15:59:41,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:59:41,078 INFO L495 AbstractCegarLoop]: Abstraction has 4579 states and 6840 transitions. [2023-12-02 15:59:41,078 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 52.666666666666664) internal successors, (158), 2 states have internal predecessors, (158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:59:41,078 INFO L276 IsEmpty]: Start isEmpty. Operand 4579 states and 6840 transitions. [2023-12-02 15:59:41,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 169 [2023-12-02 15:59:41,088 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:59:41,088 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 15:59:41,096 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66ba2723-afc8-4c4b-87fa-7dce968db381/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-12-02 15:59:41,289 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66ba2723-afc8-4c4b-87fa-7dce968db381/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:59:41,290 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:59:41,290 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:59:41,290 INFO L85 PathProgramCache]: Analyzing trace with hash 787923715, now seen corresponding path program 1 times [2023-12-02 15:59:41,290 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:59:41,291 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [162788307] [2023-12-02 15:59:41,291 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:59:41,291 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:59:41,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:59:41,412 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 30 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 15:59:41,412 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:59:41,412 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [162788307] [2023-12-02 15:59:41,413 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [162788307] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:59:41,413 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 15:59:41,413 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 15:59:41,413 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1317178311] [2023-12-02 15:59:41,413 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:59:41,414 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 15:59:41,414 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:59:41,415 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 15:59:41,415 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 15:59:41,415 INFO L87 Difference]: Start difference. First operand 4579 states and 6840 transitions. Second operand has 3 states, 3 states have (on average 56.0) internal successors, (168), 3 states have internal predecessors, (168), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:59:42,229 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:59:42,230 INFO L93 Difference]: Finished difference Result 12589 states and 18955 transitions. [2023-12-02 15:59:42,230 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 15:59:42,230 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 56.0) internal successors, (168), 3 states have internal predecessors, (168), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 168 [2023-12-02 15:59:42,230 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:59:42,272 INFO L225 Difference]: With dead ends: 12589 [2023-12-02 15:59:42,273 INFO L226 Difference]: Without dead ends: 8011 [2023-12-02 15:59:42,279 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 15:59:42,280 INFO L413 NwaCegarLoop]: 48 mSDtfsCounter, 158 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 493 mSolverCounterSat, 84 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 158 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 577 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 84 IncrementalHoareTripleChecker+Valid, 493 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-12-02 15:59:42,281 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [158 Valid, 52 Invalid, 577 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [84 Valid, 493 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-12-02 15:59:42,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8011 states. [2023-12-02 15:59:42,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8011 to 8011. [2023-12-02 15:59:42,465 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8011 states, 8010 states have (on average 1.452434456928839) internal successors, (11634), 8010 states have internal predecessors, (11634), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:59:42,484 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8011 states to 8011 states and 11634 transitions. [2023-12-02 15:59:42,484 INFO L78 Accepts]: Start accepts. Automaton has 8011 states and 11634 transitions. Word has length 168 [2023-12-02 15:59:42,484 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:59:42,485 INFO L495 AbstractCegarLoop]: Abstraction has 8011 states and 11634 transitions. [2023-12-02 15:59:42,485 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 56.0) internal successors, (168), 3 states have internal predecessors, (168), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:59:42,485 INFO L276 IsEmpty]: Start isEmpty. Operand 8011 states and 11634 transitions. [2023-12-02 15:59:42,498 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2023-12-02 15:59:42,498 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:59:42,499 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 15:59:42,499 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-12-02 15:59:42,499 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:59:42,499 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:59:42,500 INFO L85 PathProgramCache]: Analyzing trace with hash -727449207, now seen corresponding path program 1 times [2023-12-02 15:59:42,500 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:59:42,500 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [216760563] [2023-12-02 15:59:42,500 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:59:42,500 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:59:42,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:59:42,837 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 43 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-12-02 15:59:42,837 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:59:42,837 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [216760563] [2023-12-02 15:59:42,837 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [216760563] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:59:42,838 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 15:59:42,838 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 15:59:42,838 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [426455575] [2023-12-02 15:59:42,838 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:59:42,838 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 15:59:42,839 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:59:42,839 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 15:59:42,839 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 15:59:42,840 INFO L87 Difference]: Start difference. First operand 8011 states and 11634 transitions. Second operand has 3 states, 3 states have (on average 52.666666666666664) internal successors, (158), 3 states have internal predecessors, (158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:59:43,775 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:59:43,775 INFO L93 Difference]: Finished difference Result 23743 states and 34514 transitions. [2023-12-02 15:59:43,776 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 15:59:43,776 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 52.666666666666664) internal successors, (158), 3 states have internal predecessors, (158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 177 [2023-12-02 15:59:43,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:59:43,832 INFO L225 Difference]: With dead ends: 23743 [2023-12-02 15:59:43,832 INFO L226 Difference]: Without dead ends: 15733 [2023-12-02 15:59:43,841 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 15:59:43,841 INFO L413 NwaCegarLoop]: 239 mSDtfsCounter, 147 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 476 mSolverCounterSat, 132 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 147 SdHoareTripleChecker+Valid, 243 SdHoareTripleChecker+Invalid, 608 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 132 IncrementalHoareTripleChecker+Valid, 476 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2023-12-02 15:59:43,842 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [147 Valid, 243 Invalid, 608 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [132 Valid, 476 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2023-12-02 15:59:43,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15733 states. [2023-12-02 15:59:44,054 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15733 to 15733. [2023-12-02 15:59:44,078 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15733 states, 15732 states have (on average 1.3384820747520976) internal successors, (21057), 15732 states have internal predecessors, (21057), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:59:44,098 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15733 states to 15733 states and 21057 transitions. [2023-12-02 15:59:44,098 INFO L78 Accepts]: Start accepts. Automaton has 15733 states and 21057 transitions. Word has length 177 [2023-12-02 15:59:44,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:59:44,099 INFO L495 AbstractCegarLoop]: Abstraction has 15733 states and 21057 transitions. [2023-12-02 15:59:44,099 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 52.666666666666664) internal successors, (158), 3 states have internal predecessors, (158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:59:44,099 INFO L276 IsEmpty]: Start isEmpty. Operand 15733 states and 21057 transitions. [2023-12-02 15:59:44,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 187 [2023-12-02 15:59:44,116 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:59:44,116 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 15:59:44,116 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2023-12-02 15:59:44,116 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:59:44,116 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:59:44,116 INFO L85 PathProgramCache]: Analyzing trace with hash -233352857, now seen corresponding path program 1 times [2023-12-02 15:59:44,117 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:59:44,117 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1548694926] [2023-12-02 15:59:44,117 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:59:44,117 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:59:44,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:59:44,378 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 41 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-12-02 15:59:44,379 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:59:44,379 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1548694926] [2023-12-02 15:59:44,379 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1548694926] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:59:44,379 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 15:59:44,379 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-12-02 15:59:44,379 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1085092183] [2023-12-02 15:59:44,379 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:59:44,380 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 15:59:44,380 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:59:44,380 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 15:59:44,381 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 15:59:44,381 INFO L87 Difference]: Start difference. First operand 15733 states and 21057 transitions. Second operand has 3 states, 3 states have (on average 57.333333333333336) internal successors, (172), 2 states have internal predecessors, (172), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:59:45,283 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:59:45,284 INFO L93 Difference]: Finished difference Result 38903 states and 52176 transitions. [2023-12-02 15:59:45,285 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 15:59:45,286 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 57.333333333333336) internal successors, (172), 2 states have internal predecessors, (172), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 186 [2023-12-02 15:59:45,286 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:59:45,333 INFO L225 Difference]: With dead ends: 38903 [2023-12-02 15:59:45,333 INFO L226 Difference]: Without dead ends: 23743 [2023-12-02 15:59:45,350 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 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 15:59:45,351 INFO L413 NwaCegarLoop]: 63 mSDtfsCounter, 138 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 517 mSolverCounterSat, 91 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 138 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 608 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 91 IncrementalHoareTripleChecker+Valid, 517 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-12-02 15:59:45,352 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [138 Valid, 67 Invalid, 608 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [91 Valid, 517 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-12-02 15:59:45,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23743 states. [2023-12-02 15:59:45,627 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23743 to 23741. [2023-12-02 15:59:45,647 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23741 states, 23740 states have (on average 1.3118786857624263) internal successors, (31144), 23740 states have internal predecessors, (31144), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:59:45,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23741 states to 23741 states and 31144 transitions. [2023-12-02 15:59:45,673 INFO L78 Accepts]: Start accepts. Automaton has 23741 states and 31144 transitions. Word has length 186 [2023-12-02 15:59:45,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:59:45,674 INFO L495 AbstractCegarLoop]: Abstraction has 23741 states and 31144 transitions. [2023-12-02 15:59:45,674 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 57.333333333333336) internal successors, (172), 2 states have internal predecessors, (172), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:59:45,674 INFO L276 IsEmpty]: Start isEmpty. Operand 23741 states and 31144 transitions. [2023-12-02 15:59:45,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 194 [2023-12-02 15:59:45,699 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:59:45,700 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 15:59:45,700 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2023-12-02 15:59:45,700 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:59:45,700 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:59:45,700 INFO L85 PathProgramCache]: Analyzing trace with hash 1920339428, now seen corresponding path program 1 times [2023-12-02 15:59:45,701 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:59:45,701 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [810308177] [2023-12-02 15:59:45,701 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:59:45,701 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:59:45,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:59:46,032 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 55 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-12-02 15:59:46,032 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:59:46,032 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [810308177] [2023-12-02 15:59:46,032 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [810308177] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:59:46,032 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 15:59:46,033 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 15:59:46,033 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2007853812] [2023-12-02 15:59:46,033 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:59:46,033 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 15:59:46,033 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:59:46,034 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 15:59:46,034 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-12-02 15:59:46,034 INFO L87 Difference]: Start difference. First operand 23741 states and 31144 transitions. Second operand has 4 states, 4 states have (on average 44.75) internal successors, (179), 3 states have internal predecessors, (179), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:59:47,250 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:59:47,250 INFO L93 Difference]: Finished difference Result 52772 states and 70622 transitions. [2023-12-02 15:59:47,251 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 15:59:47,251 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 44.75) internal successors, (179), 3 states have internal predecessors, (179), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 193 [2023-12-02 15:59:47,251 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:59:47,316 INFO L225 Difference]: With dead ends: 52772 [2023-12-02 15:59:47,316 INFO L226 Difference]: Without dead ends: 29604 [2023-12-02 15:59:47,337 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-12-02 15:59:47,338 INFO L413 NwaCegarLoop]: 66 mSDtfsCounter, 258 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 917 mSolverCounterSat, 218 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 258 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 1135 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 218 IncrementalHoareTripleChecker+Valid, 917 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2023-12-02 15:59:47,338 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [258 Valid, 74 Invalid, 1135 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [218 Valid, 917 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2023-12-02 15:59:47,369 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29604 states. [2023-12-02 15:59:47,675 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29604 to 27459. [2023-12-02 15:59:47,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27459 states, 27458 states have (on average 1.330868963507903) internal successors, (36543), 27458 states have internal predecessors, (36543), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:59:47,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27459 states to 27459 states and 36543 transitions. [2023-12-02 15:59:47,728 INFO L78 Accepts]: Start accepts. Automaton has 27459 states and 36543 transitions. Word has length 193 [2023-12-02 15:59:47,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:59:47,728 INFO L495 AbstractCegarLoop]: Abstraction has 27459 states and 36543 transitions. [2023-12-02 15:59:47,728 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 44.75) internal successors, (179), 3 states have internal predecessors, (179), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:59:47,728 INFO L276 IsEmpty]: Start isEmpty. Operand 27459 states and 36543 transitions. [2023-12-02 15:59:47,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 195 [2023-12-02 15:59:47,751 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:59:47,751 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 15:59:47,751 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-12-02 15:59:47,751 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:59:47,751 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:59:47,752 INFO L85 PathProgramCache]: Analyzing trace with hash -1615804562, now seen corresponding path program 1 times [2023-12-02 15:59:47,752 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:59:47,752 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [22877050] [2023-12-02 15:59:47,752 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:59:47,752 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:59:47,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:59:48,066 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 56 proven. 6 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2023-12-02 15:59:48,066 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:59:48,066 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [22877050] [2023-12-02 15:59:48,066 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [22877050] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:59:48,067 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [831472655] [2023-12-02 15:59:48,067 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:59:48,067 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:59:48,067 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66ba2723-afc8-4c4b-87fa-7dce968db381/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:59:48,068 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66ba2723-afc8-4c4b-87fa-7dce968db381/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:59:48,070 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66ba2723-afc8-4c4b-87fa-7dce968db381/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-12-02 15:59:48,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:59:48,247 INFO L262 TraceCheckSpWp]: Trace formula consists of 449 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 15:59:48,252 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:59:48,432 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 50 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-12-02 15:59:48,432 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 15:59:48,432 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [831472655] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:59:48,432 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 15:59:48,433 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 5 [2023-12-02 15:59:48,433 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [328726495] [2023-12-02 15:59:48,433 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:59:48,433 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 15:59:48,434 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:59:48,434 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 15:59:48,434 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-12-02 15:59:48,434 INFO L87 Difference]: Start difference. First operand 27459 states and 36543 transitions. Second operand has 3 states, 3 states have (on average 59.0) internal successors, (177), 3 states have internal predecessors, (177), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:59:49,253 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:59:49,253 INFO L93 Difference]: Finished difference Result 55632 states and 74440 transitions. [2023-12-02 15:59:49,254 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 15:59:49,254 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 59.0) internal successors, (177), 3 states have internal predecessors, (177), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 194 [2023-12-02 15:59:49,254 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:59:49,282 INFO L225 Difference]: With dead ends: 55632 [2023-12-02 15:59:49,282 INFO L226 Difference]: Without dead ends: 28174 [2023-12-02 15:59:49,296 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 193 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-12-02 15:59:49,297 INFO L413 NwaCegarLoop]: 227 mSDtfsCounter, 9 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 560 mSolverCounterSat, 62 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 231 SdHoareTripleChecker+Invalid, 622 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 62 IncrementalHoareTripleChecker+Valid, 560 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-12-02 15:59:49,297 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 231 Invalid, 622 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [62 Valid, 560 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-12-02 15:59:49,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28174 states. [2023-12-02 15:59:49,589 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28174 to 28174. [2023-12-02 15:59:49,612 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28174 states, 28173 states have (on average 1.3344691726120754) internal successors, (37596), 28173 states have internal predecessors, (37596), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:59:49,656 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28174 states to 28174 states and 37596 transitions. [2023-12-02 15:59:49,656 INFO L78 Accepts]: Start accepts. Automaton has 28174 states and 37596 transitions. Word has length 194 [2023-12-02 15:59:49,657 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:59:49,657 INFO L495 AbstractCegarLoop]: Abstraction has 28174 states and 37596 transitions. [2023-12-02 15:59:49,657 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 59.0) internal successors, (177), 3 states have internal predecessors, (177), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:59:49,657 INFO L276 IsEmpty]: Start isEmpty. Operand 28174 states and 37596 transitions. [2023-12-02 15:59:49,681 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 200 [2023-12-02 15:59:49,681 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:59:49,681 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 15:59:49,686 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66ba2723-afc8-4c4b-87fa-7dce968db381/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-12-02 15:59:49,882 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66ba2723-afc8-4c4b-87fa-7dce968db381/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-12-02 15:59:49,882 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:59:49,883 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:59:49,883 INFO L85 PathProgramCache]: Analyzing trace with hash -501528744, now seen corresponding path program 1 times [2023-12-02 15:59:49,883 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:59:49,883 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [949115354] [2023-12-02 15:59:49,883 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:59:49,883 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:59:49,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:59:50,402 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 61 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-12-02 15:59:50,403 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:59:50,403 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [949115354] [2023-12-02 15:59:50,403 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [949115354] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:59:50,403 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [715883225] [2023-12-02 15:59:50,403 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:59:50,403 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:59:50,404 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66ba2723-afc8-4c4b-87fa-7dce968db381/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:59:50,406 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66ba2723-afc8-4c4b-87fa-7dce968db381/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:59:50,409 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66ba2723-afc8-4c4b-87fa-7dce968db381/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-12-02 15:59:50,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:59:50,608 INFO L262 TraceCheckSpWp]: Trace formula consists of 440 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 15:59:50,613 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:59:50,680 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 55 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-12-02 15:59:50,680 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 15:59:50,680 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [715883225] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:59:50,680 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 15:59:50,680 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [3] total 4 [2023-12-02 15:59:50,680 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [420424197] [2023-12-02 15:59:50,681 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:59:50,681 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 15:59:50,681 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:59:50,682 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 15:59:50,682 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-12-02 15:59:50,682 INFO L87 Difference]: Start difference. First operand 28174 states and 37596 transitions. Second operand has 3 states, 3 states have (on average 59.0) internal successors, (177), 2 states have internal predecessors, (177), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:59:51,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:59:51,125 INFO L93 Difference]: Finished difference Result 53773 states and 71565 transitions. [2023-12-02 15:59:51,125 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 15:59:51,125 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 59.0) internal successors, (177), 2 states have internal predecessors, (177), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 199 [2023-12-02 15:59:51,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:59:51,150 INFO L225 Difference]: With dead ends: 53773 [2023-12-02 15:59:51,150 INFO L226 Difference]: Without dead ends: 26172 [2023-12-02 15:59:51,165 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 198 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-12-02 15:59:51,165 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 227 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 265 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 227 SdHoareTripleChecker+Valid, 4 SdHoareTripleChecker+Invalid, 288 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 265 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 15:59:51,166 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [227 Valid, 4 Invalid, 288 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 265 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 15:59:51,189 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26172 states. [2023-12-02 15:59:51,445 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26172 to 26172. [2023-12-02 15:59:51,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26172 states, 26171 states have (on average 1.3059875434641397) internal successors, (34179), 26171 states have internal predecessors, (34179), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:59:51,501 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26172 states to 26172 states and 34179 transitions. [2023-12-02 15:59:51,501 INFO L78 Accepts]: Start accepts. Automaton has 26172 states and 34179 transitions. Word has length 199 [2023-12-02 15:59:51,501 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:59:51,501 INFO L495 AbstractCegarLoop]: Abstraction has 26172 states and 34179 transitions. [2023-12-02 15:59:51,502 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 59.0) internal successors, (177), 2 states have internal predecessors, (177), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:59:51,502 INFO L276 IsEmpty]: Start isEmpty. Operand 26172 states and 34179 transitions. [2023-12-02 15:59:51,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 201 [2023-12-02 15:59:51,517 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:59:51,517 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 15:59:51,522 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66ba2723-afc8-4c4b-87fa-7dce968db381/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-12-02 15:59:51,718 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66ba2723-afc8-4c4b-87fa-7dce968db381/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:59:51,718 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:59:51,719 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:59:51,719 INFO L85 PathProgramCache]: Analyzing trace with hash -186139437, now seen corresponding path program 1 times [2023-12-02 15:59:51,719 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:59:51,719 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1515563509] [2023-12-02 15:59:51,719 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:59:51,719 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:59:51,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:59:52,045 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 65 proven. 6 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2023-12-02 15:59:52,045 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:59:52,046 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1515563509] [2023-12-02 15:59:52,046 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1515563509] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:59:52,046 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [132155037] [2023-12-02 15:59:52,046 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:59:52,046 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:59:52,046 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66ba2723-afc8-4c4b-87fa-7dce968db381/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:59:52,047 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66ba2723-afc8-4c4b-87fa-7dce968db381/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:59:52,049 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66ba2723-afc8-4c4b-87fa-7dce968db381/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-12-02 15:59:52,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:59:52,245 INFO L262 TraceCheckSpWp]: Trace formula consists of 485 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 15:59:52,250 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:59:52,266 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 73 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-12-02 15:59:52,267 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 15:59:52,267 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [132155037] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:59:52,267 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 15:59:52,267 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 5 [2023-12-02 15:59:52,267 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [7485176] [2023-12-02 15:59:52,267 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:59:52,268 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 15:59:52,268 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:59:52,269 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 15:59:52,269 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-12-02 15:59:52,270 INFO L87 Difference]: Start difference. First operand 26172 states and 34179 transitions. Second operand has 3 states, 3 states have (on average 60.333333333333336) internal successors, (181), 3 states have internal predecessors, (181), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:59:53,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:59:53,086 INFO L93 Difference]: Finished difference Result 55775 states and 73752 transitions. [2023-12-02 15:59:53,087 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 15:59:53,087 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 60.333333333333336) internal successors, (181), 3 states have internal predecessors, (181), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 200 [2023-12-02 15:59:53,087 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:59:53,113 INFO L225 Difference]: With dead ends: 55775 [2023-12-02 15:59:53,113 INFO L226 Difference]: Without dead ends: 29604 [2023-12-02 15:59:53,126 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 199 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-12-02 15:59:53,127 INFO L413 NwaCegarLoop]: 252 mSDtfsCounter, 149 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 385 mSolverCounterSat, 162 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 149 SdHoareTripleChecker+Valid, 255 SdHoareTripleChecker+Invalid, 547 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 162 IncrementalHoareTripleChecker+Valid, 385 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-12-02 15:59:53,127 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [149 Valid, 255 Invalid, 547 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [162 Valid, 385 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-12-02 15:59:53,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29604 states. [2023-12-02 15:59:53,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29604 to 29175. [2023-12-02 15:59:53,508 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29175 states, 29174 states have (on average 1.2029204085829848) internal successors, (35094), 29174 states have internal predecessors, (35094), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:59:53,550 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29175 states to 29175 states and 35094 transitions. [2023-12-02 15:59:53,550 INFO L78 Accepts]: Start accepts. Automaton has 29175 states and 35094 transitions. Word has length 200 [2023-12-02 15:59:53,550 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:59:53,550 INFO L495 AbstractCegarLoop]: Abstraction has 29175 states and 35094 transitions. [2023-12-02 15:59:53,551 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 60.333333333333336) internal successors, (181), 3 states have internal predecessors, (181), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:59:53,551 INFO L276 IsEmpty]: Start isEmpty. Operand 29175 states and 35094 transitions. [2023-12-02 15:59:53,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 207 [2023-12-02 15:59:53,573 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:59:53,573 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 15:59:53,578 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66ba2723-afc8-4c4b-87fa-7dce968db381/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-12-02 15:59:53,774 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66ba2723-afc8-4c4b-87fa-7dce968db381/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2023-12-02 15:59:53,774 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:59:53,774 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:59:53,775 INFO L85 PathProgramCache]: Analyzing trace with hash 2063589537, now seen corresponding path program 1 times [2023-12-02 15:59:53,775 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:59:53,775 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [236294956] [2023-12-02 15:59:53,775 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:59:53,775 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:59:53,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:59:54,211 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 36 proven. 0 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2023-12-02 15:59:54,211 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:59:54,211 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [236294956] [2023-12-02 15:59:54,212 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [236294956] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:59:54,212 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 15:59:54,212 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-12-02 15:59:54,212 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [69696769] [2023-12-02 15:59:54,212 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:59:54,213 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 15:59:54,213 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:59:54,213 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 15:59:54,213 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 15:59:54,214 INFO L87 Difference]: Start difference. First operand 29175 states and 35094 transitions. Second operand has 3 states, 3 states have (on average 54.333333333333336) internal successors, (163), 2 states have internal predecessors, (163), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:59:54,911 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:59:54,911 INFO L93 Difference]: Finished difference Result 62353 states and 75116 transitions. [2023-12-02 15:59:54,912 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 15:59:54,912 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 54.333333333333336) internal successors, (163), 2 states have internal predecessors, (163), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 206 [2023-12-02 15:59:54,912 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:59:54,938 INFO L225 Difference]: With dead ends: 62353 [2023-12-02 15:59:54,939 INFO L226 Difference]: Without dead ends: 34323 [2023-12-02 15:59:54,951 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 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 15:59:54,951 INFO L413 NwaCegarLoop]: 84 mSDtfsCounter, 130 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 467 mSolverCounterSat, 93 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 130 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 560 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 93 IncrementalHoareTripleChecker+Valid, 467 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-12-02 15:59:54,952 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [130 Valid, 88 Invalid, 560 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [93 Valid, 467 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-12-02 15:59:54,975 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34323 states. [2023-12-02 15:59:55,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34323 to 33179. [2023-12-02 15:59:55,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33179 states, 33178 states have (on average 1.2013080957260835) internal successors, (39857), 33178 states have internal predecessors, (39857), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:59:55,339 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33179 states to 33179 states and 39857 transitions. [2023-12-02 15:59:55,340 INFO L78 Accepts]: Start accepts. Automaton has 33179 states and 39857 transitions. Word has length 206 [2023-12-02 15:59:55,340 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:59:55,340 INFO L495 AbstractCegarLoop]: Abstraction has 33179 states and 39857 transitions. [2023-12-02 15:59:55,340 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 54.333333333333336) internal successors, (163), 2 states have internal predecessors, (163), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:59:55,340 INFO L276 IsEmpty]: Start isEmpty. Operand 33179 states and 39857 transitions. [2023-12-02 15:59:55,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 213 [2023-12-02 15:59:55,357 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:59:55,357 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 15:59:55,357 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2023-12-02 15:59:55,357 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:59:55,358 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:59:55,358 INFO L85 PathProgramCache]: Analyzing trace with hash -1184694626, now seen corresponding path program 1 times [2023-12-02 15:59:55,358 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:59:55,358 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [194905105] [2023-12-02 15:59:55,358 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:59:55,358 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:59:55,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:59:55,613 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 82 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-12-02 15:59:55,613 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:59:55,613 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [194905105] [2023-12-02 15:59:55,614 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [194905105] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:59:55,614 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 15:59:55,614 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 15:59:55,614 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [239579959] [2023-12-02 15:59:55,614 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:59:55,615 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 15:59:55,615 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:59:55,615 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 15:59:55,615 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 15:59:55,615 INFO L87 Difference]: Start difference. First operand 33179 states and 39857 transitions. Second operand has 3 states, 3 states have (on average 69.0) internal successors, (207), 3 states have internal predecessors, (207), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:59:56,319 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:59:56,319 INFO L93 Difference]: Finished difference Result 68645 states and 82741 transitions. [2023-12-02 15:59:56,319 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 15:59:56,319 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 69.0) internal successors, (207), 3 states have internal predecessors, (207), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 212 [2023-12-02 15:59:56,320 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:59:56,344 INFO L225 Difference]: With dead ends: 68645 [2023-12-02 15:59:56,344 INFO L226 Difference]: Without dead ends: 29461 [2023-12-02 15:59:56,359 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 15:59:56,359 INFO L413 NwaCegarLoop]: 242 mSDtfsCounter, 94 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 425 mSolverCounterSat, 122 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 94 SdHoareTripleChecker+Valid, 246 SdHoareTripleChecker+Invalid, 547 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 122 IncrementalHoareTripleChecker+Valid, 425 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-12-02 15:59:56,360 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [94 Valid, 246 Invalid, 547 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [122 Valid, 425 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-12-02 15:59:56,381 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29461 states. [2023-12-02 15:59:56,571 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29461 to 23312. [2023-12-02 15:59:56,585 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23312 states, 23311 states have (on average 1.165415469091845) internal successors, (27167), 23311 states have internal predecessors, (27167), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:59:56,607 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23312 states to 23312 states and 27167 transitions. [2023-12-02 15:59:56,607 INFO L78 Accepts]: Start accepts. Automaton has 23312 states and 27167 transitions. Word has length 212 [2023-12-02 15:59:56,608 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:59:56,608 INFO L495 AbstractCegarLoop]: Abstraction has 23312 states and 27167 transitions. [2023-12-02 15:59:56,608 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 69.0) internal successors, (207), 3 states have internal predecessors, (207), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:59:56,608 INFO L276 IsEmpty]: Start isEmpty. Operand 23312 states and 27167 transitions. [2023-12-02 15:59:56,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 222 [2023-12-02 15:59:56,618 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:59:56,618 INFO L195 NwaCegarLoop]: trace histogram [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, 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, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 15:59:56,618 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2023-12-02 15:59:56,618 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:59:56,618 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:59:56,619 INFO L85 PathProgramCache]: Analyzing trace with hash 869104203, now seen corresponding path program 1 times [2023-12-02 15:59:56,619 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:59:56,619 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1506552719] [2023-12-02 15:59:56,619 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:59:56,619 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:59:56,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:59:57,502 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 77 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 15:59:57,502 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:59:57,503 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1506552719] [2023-12-02 15:59:57,503 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1506552719] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:59:57,503 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [416140133] [2023-12-02 15:59:57,503 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:59:57,503 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:59:57,503 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66ba2723-afc8-4c4b-87fa-7dce968db381/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:59:57,504 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66ba2723-afc8-4c4b-87fa-7dce968db381/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:59:57,505 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66ba2723-afc8-4c4b-87fa-7dce968db381/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-12-02 15:59:57,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:59:57,672 INFO L262 TraceCheckSpWp]: Trace formula consists of 423 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 15:59:57,677 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:59:57,921 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 12 proven. 71 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 15:59:57,922 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 15:59:58,167 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 12 proven. 71 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 15:59:58,168 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [416140133] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 15:59:58,168 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [43284616] [2023-12-02 15:59:58,196 INFO L159 IcfgInterpreter]: Started Sifa with 145 locations of interest [2023-12-02 15:59:58,196 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 15:59:58,200 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 15:59:58,205 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 15:59:58,206 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:00:37,960 WARN L293 SmtUtils]: Spent 19.40s on a formula simplification that was a NOOP. DAG size: 874 (called from [L 212] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.BasicPredicateFactory.xJunctTerm) [2023-12-02 16:00:57,313 WARN L293 SmtUtils]: Spent 19.35s on a formula simplification that was a NOOP. DAG size: 874 (called from [L 212] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.BasicPredicateFactory.xJunctTerm) [2023-12-02 16:02:45,339 WARN L176 XnfTransformerHelper]: Simplifying disjunction of 13408 conjunctions. This might take some time... [2023-12-02 16:02:55,796 INFO L192 XnfTransformerHelper]: Simplified to disjunction of 13408 conjunctions. [2023-12-02 16:02:55,929 WARN L176 XnfTransformerHelper]: Simplifying disjunction of 13408 conjunctions. This might take some time... [2023-12-02 16:03:07,582 INFO L192 XnfTransformerHelper]: Simplified to disjunction of 13408 conjunctions. [2023-12-02 16:10:11,615 WARN L293 SmtUtils]: Spent 7.06m on a formula simplification that was a NOOP. DAG size: 3756 (called from [L 212] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.BasicPredicateFactory.xJunctTerm)