./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-crafted/zero_sum_const4.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 0e0057cc Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/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_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-crafted/zero_sum_const4.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/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_af8ba8a7-108d-4f28-8762-4e7a0ab66967/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 e61c61c9ffe0a2031cf5a0964b1882adcc5bdae1b7345aeaf1c374f155ad9e78 --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-12-02 19:45:12,118 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-12-02 19:45:12,178 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-12-02 19:45:12,182 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-12-02 19:45:12,183 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-12-02 19:45:12,205 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-12-02 19:45:12,206 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-12-02 19:45:12,206 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-12-02 19:45:12,207 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-12-02 19:45:12,208 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-12-02 19:45:12,208 INFO L153 SettingsManager]: * User list type=DISABLED [2023-12-02 19:45:12,209 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-12-02 19:45:12,209 INFO L153 SettingsManager]: * Explicit value domain=true [2023-12-02 19:45:12,210 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-12-02 19:45:12,210 INFO L153 SettingsManager]: * Octagon Domain=false [2023-12-02 19:45:12,211 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-12-02 19:45:12,211 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-12-02 19:45:12,212 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-12-02 19:45:12,212 INFO L153 SettingsManager]: * Interval Domain=false [2023-12-02 19:45:12,213 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-12-02 19:45:12,213 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-12-02 19:45:12,214 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-12-02 19:45:12,215 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-12-02 19:45:12,215 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-12-02 19:45:12,216 INFO L153 SettingsManager]: * sizeof long=4 [2023-12-02 19:45:12,216 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-12-02 19:45:12,217 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-12-02 19:45:12,217 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-12-02 19:45:12,218 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-12-02 19:45:12,218 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-12-02 19:45:12,219 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-12-02 19:45:12,219 INFO L153 SettingsManager]: * sizeof long double=12 [2023-12-02 19:45:12,219 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-12-02 19:45:12,219 INFO L153 SettingsManager]: * Use constant arrays=true [2023-12-02 19:45:12,220 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-12-02 19:45:12,220 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-12-02 19:45:12,220 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-12-02 19:45:12,220 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 19:45:12,221 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-12-02 19:45:12,221 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-12-02 19:45:12,221 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-12-02 19:45:12,221 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-12-02 19:45:12,221 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-12-02 19:45:12,222 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-12-02 19:45:12,222 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-12-02 19:45:12,222 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-12-02 19:45:12,222 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-12-02 19:45:12,222 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_af8ba8a7-108d-4f28-8762-4e7a0ab66967/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> e61c61c9ffe0a2031cf5a0964b1882adcc5bdae1b7345aeaf1c374f155ad9e78 [2023-12-02 19:45:12,433 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-12-02 19:45:12,455 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-12-02 19:45:12,458 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-12-02 19:45:12,459 INFO L270 PluginConnector]: Initializing CDTParser... [2023-12-02 19:45:12,460 INFO L274 PluginConnector]: CDTParser initialized [2023-12-02 19:45:12,461 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/../../sv-benchmarks/c/array-crafted/zero_sum_const4.c [2023-12-02 19:45:15,210 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-12-02 19:45:15,385 INFO L384 CDTParser]: Found 1 translation units. [2023-12-02 19:45:15,386 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/sv-benchmarks/c/array-crafted/zero_sum_const4.c [2023-12-02 19:45:15,391 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/data/a5f2d6845/a0f61386d24c4b3aa94be90a6c9700ab/FLAGe989ea72a [2023-12-02 19:45:15,402 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/data/a5f2d6845/a0f61386d24c4b3aa94be90a6c9700ab [2023-12-02 19:45:15,404 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-12-02 19:45:15,405 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-12-02 19:45:15,405 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-12-02 19:45:15,406 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-12-02 19:45:15,410 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-12-02 19:45:15,410 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 07:45:15" (1/1) ... [2023-12-02 19:45:15,411 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4f1b61ab and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:45:15, skipping insertion in model container [2023-12-02 19:45:15,411 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 07:45:15" (1/1) ... [2023-12-02 19:45:15,430 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-12-02 19:45:15,547 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_af8ba8a7-108d-4f28-8762-4e7a0ab66967/sv-benchmarks/c/array-crafted/zero_sum_const4.c[406,419] [2023-12-02 19:45:15,568 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 19:45:15,577 INFO L202 MainTranslator]: Completed pre-run [2023-12-02 19:45:15,587 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_af8ba8a7-108d-4f28-8762-4e7a0ab66967/sv-benchmarks/c/array-crafted/zero_sum_const4.c[406,419] [2023-12-02 19:45:15,598 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 19:45:15,612 INFO L206 MainTranslator]: Completed translation [2023-12-02 19:45:15,613 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:45:15 WrapperNode [2023-12-02 19:45:15,613 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-12-02 19:45:15,614 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-12-02 19:45:15,614 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-12-02 19:45:15,614 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-12-02 19:45:15,621 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:45:15" (1/1) ... [2023-12-02 19:45:15,627 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:45:15" (1/1) ... [2023-12-02 19:45:15,644 INFO L138 Inliner]: procedures = 16, calls = 18, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 127 [2023-12-02 19:45:15,644 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-12-02 19:45:15,645 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-12-02 19:45:15,645 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-12-02 19:45:15,645 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-12-02 19:45:15,652 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:45:15" (1/1) ... [2023-12-02 19:45:15,652 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:45:15" (1/1) ... [2023-12-02 19:45:15,654 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:45:15" (1/1) ... [2023-12-02 19:45:15,654 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:45:15" (1/1) ... [2023-12-02 19:45:15,659 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:45:15" (1/1) ... [2023-12-02 19:45:15,662 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:45:15" (1/1) ... [2023-12-02 19:45:15,663 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:45:15" (1/1) ... [2023-12-02 19:45:15,664 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:45:15" (1/1) ... [2023-12-02 19:45:15,667 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-12-02 19:45:15,667 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-12-02 19:45:15,667 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-12-02 19:45:15,667 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-12-02 19:45:15,668 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:45:15" (1/1) ... [2023-12-02 19:45:15,672 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 19:45:15,682 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:45:15,691 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-12-02 19:45:15,693 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-12-02 19:45:15,721 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-12-02 19:45:15,721 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-12-02 19:45:15,722 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-12-02 19:45:15,722 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-12-02 19:45:15,722 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-12-02 19:45:15,722 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-12-02 19:45:15,722 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-12-02 19:45:15,795 INFO L241 CfgBuilder]: Building ICFG [2023-12-02 19:45:15,797 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-12-02 19:45:15,991 INFO L282 CfgBuilder]: Performing block encoding [2023-12-02 19:45:16,054 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-12-02 19:45:16,054 INFO L309 CfgBuilder]: Removed 9 assume(true) statements. [2023-12-02 19:45:16,056 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 07:45:16 BoogieIcfgContainer [2023-12-02 19:45:16,056 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-12-02 19:45:16,058 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-12-02 19:45:16,059 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-12-02 19:45:16,062 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-12-02 19:45:16,062 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.12 07:45:15" (1/3) ... [2023-12-02 19:45:16,063 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1aa31692 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 07:45:16, skipping insertion in model container [2023-12-02 19:45:16,063 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:45:15" (2/3) ... [2023-12-02 19:45:16,063 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1aa31692 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 07:45:16, skipping insertion in model container [2023-12-02 19:45:16,063 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 07:45:16" (3/3) ... [2023-12-02 19:45:16,065 INFO L112 eAbstractionObserver]: Analyzing ICFG zero_sum_const4.c [2023-12-02 19:45:16,099 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-12-02 19:45:16,099 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-12-02 19:45:16,147 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-12-02 19:45:16,154 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;@5e096161, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-12-02 19:45:16,154 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-12-02 19:45:16,157 INFO L276 IsEmpty]: Start isEmpty. Operand has 17 states, 15 states have (on average 1.8) internal successors, (27), 16 states have internal predecessors, (27), 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 19:45:16,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-12-02 19:45:16,163 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:45:16,163 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:45:16,164 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:45:16,168 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:45:16,169 INFO L85 PathProgramCache]: Analyzing trace with hash -1435089549, now seen corresponding path program 1 times [2023-12-02 19:45:16,176 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:45:16,177 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [788874909] [2023-12-02 19:45:16,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:45:16,177 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:45:16,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:45:16,408 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 19:45:16,408 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:45:16,409 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [788874909] [2023-12-02 19:45:16,409 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [788874909] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 19:45:16,410 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 19:45:16,410 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 19:45:16,411 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1852403113] [2023-12-02 19:45:16,412 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 19:45:16,416 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 19:45:16,417 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:45:16,447 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 19:45:16,447 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 19:45:16,450 INFO L87 Difference]: Start difference. First operand has 17 states, 15 states have (on average 1.8) internal successors, (27), 16 states have internal predecessors, (27), 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 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 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 19:45:16,522 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:45:16,523 INFO L93 Difference]: Finished difference Result 32 states and 51 transitions. [2023-12-02 19:45:16,524 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 19:45:16,525 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 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 13 [2023-12-02 19:45:16,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:45:16,533 INFO L225 Difference]: With dead ends: 32 [2023-12-02 19:45:16,534 INFO L226 Difference]: Without dead ends: 15 [2023-12-02 19:45:16,536 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 19:45:16,540 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 0 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 19:45:16,541 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 9 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 19:45:16,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2023-12-02 19:45:16,572 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2023-12-02 19:45:16,573 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.6428571428571428) internal successors, (23), 14 states have internal predecessors, (23), 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 19:45:16,574 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 23 transitions. [2023-12-02 19:45:16,575 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 23 transitions. Word has length 13 [2023-12-02 19:45:16,575 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:45:16,576 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 23 transitions. [2023-12-02 19:45:16,576 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 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 19:45:16,576 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 23 transitions. [2023-12-02 19:45:16,577 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-12-02 19:45:16,577 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:45:16,577 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:45:16,577 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-12-02 19:45:16,578 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:45:16,578 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:45:16,579 INFO L85 PathProgramCache]: Analyzing trace with hash -1433785562, now seen corresponding path program 1 times [2023-12-02 19:45:16,579 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:45:16,579 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1453837171] [2023-12-02 19:45:16,579 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:45:16,580 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:45:16,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:45:16,679 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 19:45:16,680 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:45:16,680 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1453837171] [2023-12-02 19:45:16,680 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1453837171] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 19:45:16,680 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 19:45:16,680 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-12-02 19:45:16,681 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [668866167] [2023-12-02 19:45:16,681 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 19:45:16,682 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 19:45:16,682 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:45:16,683 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 19:45:16,683 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-12-02 19:45:16,683 INFO L87 Difference]: Start difference. First operand 15 states and 23 transitions. Second operand has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 states have internal predecessors, (14), 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 19:45:16,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:45:16,747 INFO L93 Difference]: Finished difference Result 33 states and 55 transitions. [2023-12-02 19:45:16,748 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 19:45:16,748 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 states have internal predecessors, (14), 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 14 [2023-12-02 19:45:16,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:45:16,749 INFO L225 Difference]: With dead ends: 33 [2023-12-02 19:45:16,749 INFO L226 Difference]: Without dead ends: 23 [2023-12-02 19:45:16,750 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 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 19:45:16,751 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 19 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 19:45:16,752 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 5 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 19:45:16,753 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2023-12-02 19:45:16,758 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2023-12-02 19:45:16,758 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 22 states have internal predecessors, (31), 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 19:45:16,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 31 transitions. [2023-12-02 19:45:16,759 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 31 transitions. Word has length 14 [2023-12-02 19:45:16,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:45:16,760 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 31 transitions. [2023-12-02 19:45:16,760 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 states have internal predecessors, (14), 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 19:45:16,760 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 31 transitions. [2023-12-02 19:45:16,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2023-12-02 19:45:16,761 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:45:16,761 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] [2023-12-02 19:45:16,761 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-12-02 19:45:16,761 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:45:16,762 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:45:16,762 INFO L85 PathProgramCache]: Analyzing trace with hash -135726125, now seen corresponding path program 1 times [2023-12-02 19:45:16,762 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:45:16,763 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [969439582] [2023-12-02 19:45:16,763 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:45:16,763 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:45:16,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:45:16,885 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-12-02 19:45:16,885 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:45:16,885 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [969439582] [2023-12-02 19:45:16,886 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [969439582] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:45:16,886 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1244901705] [2023-12-02 19:45:16,886 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:45:16,886 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:45:16,887 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:45:16,889 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:45:16,894 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-12-02 19:45:16,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:45:16,977 INFO L262 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 4 conjunts are in the unsatisfiable core [2023-12-02 19:45:16,982 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:45:17,037 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-12-02 19:45:17,037 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:45:17,063 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-12-02 19:45:17,063 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1244901705] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:45:17,064 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1606976437] [2023-12-02 19:45:17,083 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 19:45:17,083 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:45:17,086 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:45:17,091 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:45:17,092 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:45:17,728 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:45:17,878 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '334#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 19:45:17,879 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:45:17,879 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 19:45:17,879 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2023-12-02 19:45:17,880 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1457625197] [2023-12-02 19:45:17,880 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 19:45:17,880 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-12-02 19:45:17,880 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:45:17,881 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-12-02 19:45:17,882 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2023-12-02 19:45:17,882 INFO L87 Difference]: Start difference. First operand 23 states and 31 transitions. Second operand has 7 states, 7 states have (on average 3.857142857142857) internal successors, (27), 7 states have internal predecessors, (27), 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 19:45:17,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:45:17,965 INFO L93 Difference]: Finished difference Result 43 states and 59 transitions. [2023-12-02 19:45:17,968 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 19:45:17,969 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.857142857142857) internal successors, (27), 7 states have internal predecessors, (27), 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 22 [2023-12-02 19:45:17,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:45:17,969 INFO L225 Difference]: With dead ends: 43 [2023-12-02 19:45:17,969 INFO L226 Difference]: Without dead ends: 24 [2023-12-02 19:45:17,970 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 57 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2023-12-02 19:45:17,971 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 95 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 95 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 95 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 19:45:17,972 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 11 Invalid, 95 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 95 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 19:45:17,973 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2023-12-02 19:45:17,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2023-12-02 19:45:17,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 23 states have (on average 1.391304347826087) internal successors, (32), 23 states have internal predecessors, (32), 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 19:45:17,978 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 32 transitions. [2023-12-02 19:45:17,978 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 32 transitions. Word has length 22 [2023-12-02 19:45:17,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:45:17,979 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 32 transitions. [2023-12-02 19:45:17,979 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.857142857142857) internal successors, (27), 7 states have internal predecessors, (27), 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 19:45:17,979 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 32 transitions. [2023-12-02 19:45:17,980 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2023-12-02 19:45:17,980 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:45:17,980 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:45:17,986 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-12-02 19:45:18,180 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:45:18,181 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:45:18,181 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:45:18,182 INFO L85 PathProgramCache]: Analyzing trace with hash -557789312, now seen corresponding path program 2 times [2023-12-02 19:45:18,182 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:45:18,182 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1209348630] [2023-12-02 19:45:18,182 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:45:18,182 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:45:18,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:45:18,281 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-12-02 19:45:18,281 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:45:18,281 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1209348630] [2023-12-02 19:45:18,282 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1209348630] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:45:18,282 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [246255512] [2023-12-02 19:45:18,282 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 19:45:18,282 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:45:18,282 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:45:18,283 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:45:18,298 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-12-02 19:45:18,362 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-12-02 19:45:18,362 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 19:45:18,363 INFO L262 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 4 conjunts are in the unsatisfiable core [2023-12-02 19:45:18,365 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:45:18,411 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-12-02 19:45:18,411 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:45:18,451 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-12-02 19:45:18,451 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [246255512] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:45:18,451 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [691656773] [2023-12-02 19:45:18,454 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 19:45:18,454 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:45:18,455 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:45:18,455 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:45:18,455 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:45:18,724 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:45:18,850 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '600#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 19:45:18,850 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:45:18,850 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 19:45:18,850 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2023-12-02 19:45:18,850 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [235722755] [2023-12-02 19:45:18,850 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 19:45:18,851 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-12-02 19:45:18,851 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:45:18,852 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-12-02 19:45:18,852 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=115, Unknown=0, NotChecked=0, Total=156 [2023-12-02 19:45:18,852 INFO L87 Difference]: Start difference. First operand 24 states and 32 transitions. Second operand has 8 states, 8 states have (on average 5.0) internal successors, (40), 8 states have internal predecessors, (40), 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 19:45:18,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:45:18,937 INFO L93 Difference]: Finished difference Result 49 states and 71 transitions. [2023-12-02 19:45:18,937 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-12-02 19:45:18,937 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 5.0) internal successors, (40), 8 states have internal predecessors, (40), 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 23 [2023-12-02 19:45:18,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:45:18,938 INFO L225 Difference]: With dead ends: 49 [2023-12-02 19:45:18,938 INFO L226 Difference]: Without dead ends: 32 [2023-12-02 19:45:18,939 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 58 SyntacticMatches, 3 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=41, Invalid=115, Unknown=0, NotChecked=0, Total=156 [2023-12-02 19:45:18,940 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 8 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 53 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 89 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 53 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 19:45:18,940 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 9 Invalid, 89 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 53 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 19:45:18,941 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2023-12-02 19:45:18,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2023-12-02 19:45:18,946 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 31 states have (on average 1.2903225806451613) internal successors, (40), 31 states have internal predecessors, (40), 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 19:45:18,947 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 40 transitions. [2023-12-02 19:45:18,947 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 40 transitions. Word has length 23 [2023-12-02 19:45:18,947 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:45:18,947 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 40 transitions. [2023-12-02 19:45:18,948 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 5.0) internal successors, (40), 8 states have internal predecessors, (40), 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 19:45:18,948 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 40 transitions. [2023-12-02 19:45:18,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2023-12-02 19:45:18,949 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:45:18,949 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:45:18,954 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-12-02 19:45:19,153 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:45:19,154 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:45:19,154 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:45:19,154 INFO L85 PathProgramCache]: Analyzing trace with hash -315919245, now seen corresponding path program 3 times [2023-12-02 19:45:19,154 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:45:19,154 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [595378131] [2023-12-02 19:45:19,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:45:19,155 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:45:19,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:45:21,531 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:45:21,532 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:45:21,532 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [595378131] [2023-12-02 19:45:21,532 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [595378131] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:45:21,532 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [908695355] [2023-12-02 19:45:21,532 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 19:45:21,532 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:45:21,532 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:45:21,534 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:45:21,555 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-12-02 19:45:21,627 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 19:45:21,627 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 19:45:21,630 INFO L262 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 82 conjunts are in the unsatisfiable core [2023-12-02 19:45:21,635 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:45:21,965 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 24 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 19:45:21,965 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:45:22,328 INFO L349 Elim1Store]: treesize reduction 10, result has 76.7 percent of original size [2023-12-02 19:45:22,329 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 35 treesize of output 41 [2023-12-02 19:45:22,498 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:45:22,499 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [908695355] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:45:22,500 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1497668176] [2023-12-02 19:45:22,502 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 19:45:22,502 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:45:22,503 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:45:22,503 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:45:22,503 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:45:22,872 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:45:23,140 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '965#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 19:45:23,140 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:45:23,140 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 19:45:23,140 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 14] total 31 [2023-12-02 19:45:23,141 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [950443079] [2023-12-02 19:45:23,141 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 19:45:23,142 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2023-12-02 19:45:23,142 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:45:23,143 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2023-12-02 19:45:23,144 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=147, Invalid=1113, Unknown=0, NotChecked=0, Total=1260 [2023-12-02 19:45:23,144 INFO L87 Difference]: Start difference. First operand 32 states and 40 transitions. Second operand has 31 states, 31 states have (on average 2.806451612903226) internal successors, (87), 31 states have internal predecessors, (87), 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 19:45:23,932 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:45:23,932 INFO L93 Difference]: Finished difference Result 57 states and 72 transitions. [2023-12-02 19:45:23,933 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-12-02 19:45:23,933 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 2.806451612903226) internal successors, (87), 31 states have internal predecessors, (87), 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 31 [2023-12-02 19:45:23,933 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:45:23,934 INFO L225 Difference]: With dead ends: 57 [2023-12-02 19:45:23,934 INFO L226 Difference]: Without dead ends: 54 [2023-12-02 19:45:23,935 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 87 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=252, Invalid=1818, Unknown=0, NotChecked=0, Total=2070 [2023-12-02 19:45:23,936 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 7 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 599 mSolverCounterSat, 48 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 647 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 48 IncrementalHoareTripleChecker+Valid, 599 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 19:45:23,937 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 35 Invalid, 647 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [48 Valid, 599 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 19:45:23,938 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2023-12-02 19:45:23,948 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 52. [2023-12-02 19:45:23,949 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 51 states have (on average 1.3137254901960784) internal successors, (67), 51 states have internal predecessors, (67), 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 19:45:23,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 67 transitions. [2023-12-02 19:45:23,950 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 67 transitions. Word has length 31 [2023-12-02 19:45:23,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:45:23,950 INFO L495 AbstractCegarLoop]: Abstraction has 52 states and 67 transitions. [2023-12-02 19:45:23,951 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 2.806451612903226) internal successors, (87), 31 states have internal predecessors, (87), 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 19:45:23,951 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 67 transitions. [2023-12-02 19:45:23,952 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2023-12-02 19:45:23,952 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:45:23,952 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:45:23,957 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-12-02 19:45:24,153 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:45:24,153 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:45:24,153 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:45:24,153 INFO L85 PathProgramCache]: Analyzing trace with hash 335112836, now seen corresponding path program 4 times [2023-12-02 19:45:24,154 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:45:24,154 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [214183704] [2023-12-02 19:45:24,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:45:24,154 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:45:24,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:45:24,262 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-12-02 19:45:24,262 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:45:24,262 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [214183704] [2023-12-02 19:45:24,262 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [214183704] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:45:24,262 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1661898823] [2023-12-02 19:45:24,262 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 19:45:24,262 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:45:24,263 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:45:24,263 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:45:24,266 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-12-02 19:45:24,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:45:24,345 INFO L262 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 8 conjunts are in the unsatisfiable core [2023-12-02 19:45:24,347 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:45:24,404 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-12-02 19:45:24,404 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:45:24,448 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-12-02 19:45:24,449 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1661898823] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:45:24,449 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2012217445] [2023-12-02 19:45:24,451 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 19:45:24,452 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:45:24,452 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:45:24,452 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:45:24,452 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:45:24,678 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:45:24,817 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1395#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 19:45:24,817 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:45:24,818 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 19:45:24,818 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2023-12-02 19:45:24,818 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [536102524] [2023-12-02 19:45:24,818 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 19:45:24,818 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-12-02 19:45:24,819 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:45:24,819 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-12-02 19:45:24,820 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=264, Unknown=0, NotChecked=0, Total=342 [2023-12-02 19:45:24,820 INFO L87 Difference]: Start difference. First operand 52 states and 67 transitions. Second operand has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 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 19:45:25,072 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:45:25,073 INFO L93 Difference]: Finished difference Result 114 states and 149 transitions. [2023-12-02 19:45:25,073 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-12-02 19:45:25,073 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 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 32 [2023-12-02 19:45:25,073 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:45:25,074 INFO L225 Difference]: With dead ends: 114 [2023-12-02 19:45:25,074 INFO L226 Difference]: Without dead ends: 65 [2023-12-02 19:45:25,075 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 81 SyntacticMatches, 5 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 158 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=107, Invalid=355, Unknown=0, NotChecked=0, Total=462 [2023-12-02 19:45:25,076 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 28 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 187 mSolverCounterSat, 122 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 309 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 122 IncrementalHoareTripleChecker+Valid, 187 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 19:45:25,076 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 15 Invalid, 309 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [122 Valid, 187 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 19:45:25,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2023-12-02 19:45:25,087 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 58. [2023-12-02 19:45:25,087 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 57 states have (on average 1.263157894736842) internal successors, (72), 57 states have internal predecessors, (72), 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 19:45:25,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 72 transitions. [2023-12-02 19:45:25,088 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 72 transitions. Word has length 32 [2023-12-02 19:45:25,088 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:45:25,088 INFO L495 AbstractCegarLoop]: Abstraction has 58 states and 72 transitions. [2023-12-02 19:45:25,089 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 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 19:45:25,089 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 72 transitions. [2023-12-02 19:45:25,090 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2023-12-02 19:45:25,090 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:45:25,090 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:45:25,096 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-12-02 19:45:25,295 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:45:25,295 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:45:25,296 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:45:25,296 INFO L85 PathProgramCache]: Analyzing trace with hash -269107872, now seen corresponding path program 5 times [2023-12-02 19:45:25,296 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:45:25,296 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1647900663] [2023-12-02 19:45:25,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:45:25,296 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:45:25,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:45:25,418 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-12-02 19:45:25,418 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:45:25,419 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1647900663] [2023-12-02 19:45:25,419 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1647900663] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:45:25,419 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1257443943] [2023-12-02 19:45:25,419 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 19:45:25,419 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:45:25,419 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:45:25,421 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:45:25,423 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-12-02 19:45:25,505 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-12-02 19:45:25,505 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 19:45:25,506 INFO L262 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 8 conjunts are in the unsatisfiable core [2023-12-02 19:45:25,508 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:45:25,565 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-12-02 19:45:25,565 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:45:25,628 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-12-02 19:45:25,628 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1257443943] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:45:25,628 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2078766934] [2023-12-02 19:45:25,630 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 19:45:25,630 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:45:25,631 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:45:25,631 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:45:25,631 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:45:25,921 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:45:26,036 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1937#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 19:45:26,036 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:45:26,037 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 19:45:26,037 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2023-12-02 19:45:26,037 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1083084192] [2023-12-02 19:45:26,037 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 19:45:26,037 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-12-02 19:45:26,038 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:45:26,038 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-12-02 19:45:26,038 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=241, Unknown=0, NotChecked=0, Total=306 [2023-12-02 19:45:26,038 INFO L87 Difference]: Start difference. First operand 58 states and 72 transitions. Second operand has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 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 19:45:26,237 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:45:26,238 INFO L93 Difference]: Finished difference Result 62 states and 76 transitions. [2023-12-02 19:45:26,238 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-12-02 19:45:26,238 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 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 33 [2023-12-02 19:45:26,238 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:45:26,239 INFO L225 Difference]: With dead ends: 62 [2023-12-02 19:45:26,239 INFO L226 Difference]: Without dead ends: 41 [2023-12-02 19:45:26,240 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 84 SyntacticMatches, 6 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 157 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=103, Invalid=403, Unknown=0, NotChecked=0, Total=506 [2023-12-02 19:45:26,240 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 32 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 145 mSolverCounterSat, 152 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 297 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 152 IncrementalHoareTripleChecker+Valid, 145 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 19:45:26,241 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [32 Valid, 9 Invalid, 297 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [152 Valid, 145 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 19:45:26,241 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2023-12-02 19:45:26,248 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2023-12-02 19:45:26,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 40 states have (on average 1.225) internal successors, (49), 40 states have internal predecessors, (49), 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 19:45:26,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 49 transitions. [2023-12-02 19:45:26,249 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 49 transitions. Word has length 33 [2023-12-02 19:45:26,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:45:26,249 INFO L495 AbstractCegarLoop]: Abstraction has 41 states and 49 transitions. [2023-12-02 19:45:26,250 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 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 19:45:26,250 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 49 transitions. [2023-12-02 19:45:26,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2023-12-02 19:45:26,251 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:45:26,251 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:45:26,256 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-12-02 19:45:26,451 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:45:26,452 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:45:26,452 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:45:26,452 INFO L85 PathProgramCache]: Analyzing trace with hash 1553637331, now seen corresponding path program 6 times [2023-12-02 19:45:26,452 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:45:26,452 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [74946556] [2023-12-02 19:45:26,452 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:45:26,452 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:45:26,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:45:30,863 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 54 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:45:30,863 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:45:30,863 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [74946556] [2023-12-02 19:45:30,863 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [74946556] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:45:30,863 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1055348162] [2023-12-02 19:45:30,863 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 19:45:30,863 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:45:30,864 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:45:30,864 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:45:30,866 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-12-02 19:45:30,944 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 19:45:30,944 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 19:45:30,947 WARN L260 TraceCheckSpWp]: Trace formula consists of 216 conjuncts, 114 conjunts are in the unsatisfiable core [2023-12-02 19:45:30,950 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:45:31,523 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 3 proven. 48 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-12-02 19:45:31,523 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:45:32,185 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 19:45:32,185 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 52 treesize of output 89 [2023-12-02 19:45:32,529 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 53 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 19:45:32,529 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1055348162] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:45:32,529 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1046337994] [2023-12-02 19:45:32,531 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 19:45:32,531 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:45:32,531 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:45:32,531 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:45:32,532 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:45:32,730 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:45:33,035 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2435#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 19:45:33,035 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:45:33,035 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 19:45:33,035 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 14, 17] total 57 [2023-12-02 19:45:33,036 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [914251812] [2023-12-02 19:45:33,036 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 19:45:33,036 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2023-12-02 19:45:33,036 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:45:33,037 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2023-12-02 19:45:33,038 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=270, Invalid=3512, Unknown=0, NotChecked=0, Total=3782 [2023-12-02 19:45:33,039 INFO L87 Difference]: Start difference. First operand 41 states and 49 transitions. Second operand has 57 states, 57 states have (on average 1.9824561403508771) internal successors, (113), 57 states have internal predecessors, (113), 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 19:45:38,028 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:45:38,029 INFO L93 Difference]: Finished difference Result 149 states and 193 transitions. [2023-12-02 19:45:38,029 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2023-12-02 19:45:38,029 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 1.9824561403508771) internal successors, (113), 57 states have internal predecessors, (113), 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 40 [2023-12-02 19:45:38,030 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:45:38,030 INFO L225 Difference]: With dead ends: 149 [2023-12-02 19:45:38,031 INFO L226 Difference]: Without dead ends: 115 [2023-12-02 19:45:38,033 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 198 GetRequests, 97 SyntacticMatches, 0 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2123 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=1201, Invalid=9305, Unknown=0, NotChecked=0, Total=10506 [2023-12-02 19:45:38,034 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 157 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 2075 mSolverCounterSat, 872 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 157 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 2947 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 872 IncrementalHoareTripleChecker+Valid, 2075 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2023-12-02 19:45:38,034 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [157 Valid, 35 Invalid, 2947 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [872 Valid, 2075 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2023-12-02 19:45:38,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2023-12-02 19:45:38,050 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 73. [2023-12-02 19:45:38,050 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 72 states have (on average 1.25) internal successors, (90), 72 states have internal predecessors, (90), 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 19:45:38,051 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 90 transitions. [2023-12-02 19:45:38,051 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 90 transitions. Word has length 40 [2023-12-02 19:45:38,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:45:38,051 INFO L495 AbstractCegarLoop]: Abstraction has 73 states and 90 transitions. [2023-12-02 19:45:38,051 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 57 states, 57 states have (on average 1.9824561403508771) internal successors, (113), 57 states have internal predecessors, (113), 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 19:45:38,051 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 90 transitions. [2023-12-02 19:45:38,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2023-12-02 19:45:38,052 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:45:38,052 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:45:38,057 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-12-02 19:45:38,253 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:45:38,253 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:45:38,253 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:45:38,253 INFO L85 PathProgramCache]: Analyzing trace with hash 917851843, now seen corresponding path program 7 times [2023-12-02 19:45:38,254 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:45:38,254 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1431559489] [2023-12-02 19:45:38,254 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:45:38,254 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:45:38,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:45:38,379 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 7 proven. 9 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2023-12-02 19:45:38,379 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:45:38,379 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1431559489] [2023-12-02 19:45:38,379 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1431559489] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:45:38,379 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1640000193] [2023-12-02 19:45:38,379 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 19:45:38,380 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:45:38,380 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:45:38,380 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:45:38,390 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-12-02 19:45:38,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:45:38,471 INFO L262 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 10 conjunts are in the unsatisfiable core [2023-12-02 19:45:38,474 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:45:38,565 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2023-12-02 19:45:38,565 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:45:38,648 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2023-12-02 19:45:38,649 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1640000193] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:45:38,649 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2117493903] [2023-12-02 19:45:38,651 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 19:45:38,651 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:45:38,651 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:45:38,652 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:45:38,652 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:45:38,859 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:45:39,000 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3207#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 19:45:39,001 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:45:39,001 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 19:45:39,001 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 17 [2023-12-02 19:45:39,001 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1508895904] [2023-12-02 19:45:39,001 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 19:45:39,002 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-12-02 19:45:39,002 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:45:39,002 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-12-02 19:45:39,002 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=359, Unknown=0, NotChecked=0, Total=462 [2023-12-02 19:45:39,003 INFO L87 Difference]: Start difference. First operand 73 states and 90 transitions. Second operand has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 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 19:45:39,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:45:39,221 INFO L93 Difference]: Finished difference Result 141 states and 175 transitions. [2023-12-02 19:45:39,221 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-12-02 19:45:39,222 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 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 41 [2023-12-02 19:45:39,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:45:39,222 INFO L225 Difference]: With dead ends: 141 [2023-12-02 19:45:39,222 INFO L226 Difference]: Without dead ends: 50 [2023-12-02 19:45:39,223 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 105 SyntacticMatches, 7 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 233 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=139, Invalid=461, Unknown=0, NotChecked=0, Total=600 [2023-12-02 19:45:39,224 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 4 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 253 mSolverCounterSat, 224 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 477 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 224 IncrementalHoareTripleChecker+Valid, 253 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 19:45:39,224 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 9 Invalid, 477 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [224 Valid, 253 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 19:45:39,225 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2023-12-02 19:45:39,235 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2023-12-02 19:45:39,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 49 states have (on average 1.183673469387755) internal successors, (58), 49 states have internal predecessors, (58), 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 19:45:39,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 58 transitions. [2023-12-02 19:45:39,236 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 58 transitions. Word has length 41 [2023-12-02 19:45:39,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:45:39,236 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 58 transitions. [2023-12-02 19:45:39,236 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 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 19:45:39,236 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 58 transitions. [2023-12-02 19:45:39,237 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2023-12-02 19:45:39,237 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:45:39,238 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:45:39,242 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2023-12-02 19:45:39,438 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:45:39,438 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:45:39,438 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:45:39,439 INFO L85 PathProgramCache]: Analyzing trace with hash -1663966349, now seen corresponding path program 8 times [2023-12-02 19:45:39,439 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:45:39,439 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [183140159] [2023-12-02 19:45:39,439 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:45:39,439 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:45:39,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:45:44,358 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 1 proven. 89 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:45:44,358 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:45:44,358 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [183140159] [2023-12-02 19:45:44,359 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [183140159] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:45:44,359 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [326478788] [2023-12-02 19:45:44,359 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 19:45:44,359 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:45:44,359 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:45:44,360 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:45:44,361 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-12-02 19:45:44,454 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-12-02 19:45:44,454 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 19:45:44,459 WARN L260 TraceCheckSpWp]: Trace formula consists of 263 conjuncts, 151 conjunts are in the unsatisfiable core [2023-12-02 19:45:44,464 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:45:44,513 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-12-02 19:45:45,769 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 19:45:45,769 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 19 [2023-12-02 19:45:45,860 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 4 proven. 80 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-12-02 19:45:45,860 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:45:46,575 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 84 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-12-02 19:45:46,575 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [326478788] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:45:46,576 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [296608442] [2023-12-02 19:45:46,577 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 19:45:46,577 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:45:46,578 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:45:46,578 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:45:46,578 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:45:46,767 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:45:47,116 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3939#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 19:45:47,116 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:45:47,116 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 19:45:47,116 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 16, 14] total 64 [2023-12-02 19:45:47,116 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [705850159] [2023-12-02 19:45:47,116 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 19:45:47,116 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 64 states [2023-12-02 19:45:47,116 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:45:47,117 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2023-12-02 19:45:47,118 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=283, Invalid=4409, Unknown=0, NotChecked=0, Total=4692 [2023-12-02 19:45:47,118 INFO L87 Difference]: Start difference. First operand 50 states and 58 transitions. Second operand has 64 states, 64 states have (on average 2.15625) internal successors, (138), 64 states have internal predecessors, (138), 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 19:45:53,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:45:53,058 INFO L93 Difference]: Finished difference Result 131 states and 159 transitions. [2023-12-02 19:45:53,058 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2023-12-02 19:45:53,059 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 2.15625) internal successors, (138), 64 states have internal predecessors, (138), 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 49 [2023-12-02 19:45:53,059 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:45:53,061 INFO L225 Difference]: With dead ends: 131 [2023-12-02 19:45:53,061 INFO L226 Difference]: Without dead ends: 127 [2023-12-02 19:45:53,066 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 237 GetRequests, 121 SyntacticMatches, 5 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3085 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=1129, Invalid=11527, Unknown=0, NotChecked=0, Total=12656 [2023-12-02 19:45:53,067 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 160 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 2915 mSolverCounterSat, 896 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 160 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 3811 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 896 IncrementalHoareTripleChecker+Valid, 2915 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2023-12-02 19:45:53,067 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [160 Valid, 43 Invalid, 3811 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [896 Valid, 2915 Invalid, 0 Unknown, 0 Unchecked, 2.2s Time] [2023-12-02 19:45:53,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2023-12-02 19:45:53,092 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 51. [2023-12-02 19:45:53,093 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 50 states have (on average 1.18) internal successors, (59), 50 states have internal predecessors, (59), 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 19:45:53,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 59 transitions. [2023-12-02 19:45:53,093 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 59 transitions. Word has length 49 [2023-12-02 19:45:53,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:45:53,093 INFO L495 AbstractCegarLoop]: Abstraction has 51 states and 59 transitions. [2023-12-02 19:45:53,094 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 64 states, 64 states have (on average 2.15625) internal successors, (138), 64 states have internal predecessors, (138), 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 19:45:53,094 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 59 transitions. [2023-12-02 19:45:53,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2023-12-02 19:45:53,094 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:45:53,094 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:45:53,099 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-12-02 19:45:53,294 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-12-02 19:45:53,295 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:45:53,295 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:45:53,295 INFO L85 PathProgramCache]: Analyzing trace with hash -43614429, now seen corresponding path program 9 times [2023-12-02 19:45:53,295 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:45:53,295 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [285178112] [2023-12-02 19:45:53,295 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:45:53,296 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:45:53,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:45:53,446 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 11 proven. 14 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2023-12-02 19:45:53,446 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:45:53,446 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [285178112] [2023-12-02 19:45:53,446 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [285178112] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:45:53,446 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1455068249] [2023-12-02 19:45:53,446 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 19:45:53,446 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:45:53,446 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:45:53,447 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:45:53,448 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-12-02 19:45:53,516 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 19:45:53,516 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 19:45:53,517 INFO L262 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 12 conjunts are in the unsatisfiable core [2023-12-02 19:45:53,520 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:45:53,607 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2023-12-02 19:45:53,607 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:45:53,689 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2023-12-02 19:45:53,689 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1455068249] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:45:53,689 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [949904319] [2023-12-02 19:45:53,691 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 19:45:53,691 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:45:53,691 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:45:53,691 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:45:53,691 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:45:53,870 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:45:53,986 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4696#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 19:45:53,986 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:45:53,986 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 19:45:53,986 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2023-12-02 19:45:53,986 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1760806142] [2023-12-02 19:45:53,986 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 19:45:53,986 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2023-12-02 19:45:53,987 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:45:53,987 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2023-12-02 19:45:53,987 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=468, Unknown=0, NotChecked=0, Total=600 [2023-12-02 19:45:53,987 INFO L87 Difference]: Start difference. First operand 51 states and 59 transitions. Second operand has 20 states, 20 states have (on average 2.25) internal successors, (45), 20 states have internal predecessors, (45), 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 19:45:54,243 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:45:54,243 INFO L93 Difference]: Finished difference Result 139 states and 169 transitions. [2023-12-02 19:45:54,243 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-12-02 19:45:54,243 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.25) internal successors, (45), 20 states have internal predecessors, (45), 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 50 [2023-12-02 19:45:54,243 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:45:54,244 INFO L225 Difference]: With dead ends: 139 [2023-12-02 19:45:54,244 INFO L226 Difference]: Without dead ends: 59 [2023-12-02 19:45:54,245 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 129 SyntacticMatches, 9 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 330 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=186, Invalid=626, Unknown=0, NotChecked=0, Total=812 [2023-12-02 19:45:54,245 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 6 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 206 mSolverCounterSat, 295 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 501 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 295 IncrementalHoareTripleChecker+Valid, 206 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 19:45:54,246 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 9 Invalid, 501 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [295 Valid, 206 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 19:45:54,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2023-12-02 19:45:54,274 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2023-12-02 19:45:54,275 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 58 states have (on average 1.1551724137931034) internal successors, (67), 58 states have internal predecessors, (67), 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 19:45:54,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 67 transitions. [2023-12-02 19:45:54,275 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 67 transitions. Word has length 50 [2023-12-02 19:45:54,275 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:45:54,275 INFO L495 AbstractCegarLoop]: Abstraction has 59 states and 67 transitions. [2023-12-02 19:45:54,276 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.25) internal successors, (45), 20 states have internal predecessors, (45), 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 19:45:54,276 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 67 transitions. [2023-12-02 19:45:54,276 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2023-12-02 19:45:54,276 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:45:54,277 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:45:54,281 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2023-12-02 19:45:54,477 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2023-12-02 19:45:54,477 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:45:54,477 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:45:54,478 INFO L85 PathProgramCache]: Analyzing trace with hash -111901741, now seen corresponding path program 10 times [2023-12-02 19:45:54,478 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:45:54,478 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [351901958] [2023-12-02 19:45:54,478 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:45:54,478 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:45:54,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:46:01,073 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 3 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:46:01,073 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:46:01,073 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [351901958] [2023-12-02 19:46:01,073 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [351901958] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:46:01,073 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1988989635] [2023-12-02 19:46:01,073 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 19:46:01,073 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:46:01,074 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:46:01,074 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:46:01,075 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-12-02 19:46:01,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:46:01,163 WARN L260 TraceCheckSpWp]: Trace formula consists of 310 conjuncts, 182 conjunts are in the unsatisfiable core [2023-12-02 19:46:01,166 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:46:01,309 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-12-02 19:46:02,260 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 0 proven. 135 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:46:02,260 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:46:03,239 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-12-02 19:46:03,239 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1988989635] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:46:03,239 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [972478870] [2023-12-02 19:46:03,241 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 19:46:03,241 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:46:03,241 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:46:03,241 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:46:03,241 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:46:03,419 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:46:03,856 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5508#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 19:46:03,856 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:46:03,856 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 19:46:03,856 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 21, 15] total 74 [2023-12-02 19:46:03,856 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1256527996] [2023-12-02 19:46:03,856 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 19:46:03,857 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 74 states [2023-12-02 19:46:03,857 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:46:03,858 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2023-12-02 19:46:03,859 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=326, Invalid=5836, Unknown=0, NotChecked=0, Total=6162 [2023-12-02 19:46:03,860 INFO L87 Difference]: Start difference. First operand 59 states and 67 transitions. Second operand has 74 states, 74 states have (on average 2.189189189189189) internal successors, (162), 74 states have internal predecessors, (162), 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 19:46:08,839 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:46:08,839 INFO L93 Difference]: Finished difference Result 179 states and 211 transitions. [2023-12-02 19:46:08,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2023-12-02 19:46:08,840 INFO L78 Accepts]: Start accepts. Automaton has has 74 states, 74 states have (on average 2.189189189189189) internal successors, (162), 74 states have internal predecessors, (162), 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 58 [2023-12-02 19:46:08,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:46:08,841 INFO L225 Difference]: With dead ends: 179 [2023-12-02 19:46:08,841 INFO L226 Difference]: Without dead ends: 131 [2023-12-02 19:46:08,844 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 258 GetRequests, 152 SyntacticMatches, 0 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2574 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=901, Invalid=10655, Unknown=0, NotChecked=0, Total=11556 [2023-12-02 19:46:08,845 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 133 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 3360 mSolverCounterSat, 975 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 133 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 4335 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 975 IncrementalHoareTripleChecker+Valid, 3360 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2023-12-02 19:46:08,845 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [133 Valid, 67 Invalid, 4335 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [975 Valid, 3360 Invalid, 0 Unknown, 0 Unchecked, 2.3s Time] [2023-12-02 19:46:08,846 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2023-12-02 19:46:08,898 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 110. [2023-12-02 19:46:08,898 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 109 states have (on average 1.146788990825688) internal successors, (125), 109 states have internal predecessors, (125), 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 19:46:08,899 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 125 transitions. [2023-12-02 19:46:08,899 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 125 transitions. Word has length 58 [2023-12-02 19:46:08,899 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:46:08,899 INFO L495 AbstractCegarLoop]: Abstraction has 110 states and 125 transitions. [2023-12-02 19:46:08,899 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 74 states, 74 states have (on average 2.189189189189189) internal successors, (162), 74 states have internal predecessors, (162), 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 19:46:08,899 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 125 transitions. [2023-12-02 19:46:08,900 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2023-12-02 19:46:08,900 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:46:08,900 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:46:08,906 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2023-12-02 19:46:09,101 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2023-12-02 19:46:09,101 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:46:09,101 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:46:09,101 INFO L85 PathProgramCache]: Analyzing trace with hash 825748163, now seen corresponding path program 11 times [2023-12-02 19:46:09,101 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:46:09,102 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1578261404] [2023-12-02 19:46:09,102 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:46:09,102 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:46:09,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:46:09,268 INFO L134 CoverageAnalysis]: Checked inductivity of 141 backedges. 16 proven. 20 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2023-12-02 19:46:09,268 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:46:09,268 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1578261404] [2023-12-02 19:46:09,268 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1578261404] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:46:09,268 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [714146933] [2023-12-02 19:46:09,268 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 19:46:09,268 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:46:09,269 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:46:09,269 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:46:09,270 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-12-02 19:46:09,393 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-12-02 19:46:09,393 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 19:46:09,395 INFO L262 TraceCheckSpWp]: Trace formula consists of 315 conjuncts, 14 conjunts are in the unsatisfiable core [2023-12-02 19:46:09,398 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:46:09,533 INFO L134 CoverageAnalysis]: Checked inductivity of 141 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2023-12-02 19:46:09,533 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:46:09,648 INFO L134 CoverageAnalysis]: Checked inductivity of 141 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2023-12-02 19:46:09,648 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [714146933] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:46:09,648 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [469245968] [2023-12-02 19:46:09,650 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 19:46:09,650 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:46:09,650 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:46:09,650 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:46:09,650 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:46:09,832 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:46:09,965 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6505#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 19:46:09,966 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:46:09,966 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 19:46:09,966 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 23 [2023-12-02 19:46:09,966 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1819942833] [2023-12-02 19:46:09,966 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 19:46:09,966 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2023-12-02 19:46:09,967 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:46:09,967 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2023-12-02 19:46:09,967 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=599, Unknown=0, NotChecked=0, Total=756 [2023-12-02 19:46:09,968 INFO L87 Difference]: Start difference. First operand 110 states and 125 transitions. Second operand has 23 states, 23 states have (on average 2.217391304347826) internal successors, (51), 23 states have internal predecessors, (51), 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 19:46:10,343 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:46:10,343 INFO L93 Difference]: Finished difference Result 191 states and 219 transitions. [2023-12-02 19:46:10,343 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-12-02 19:46:10,343 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.217391304347826) internal successors, (51), 23 states have internal predecessors, (51), 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 59 [2023-12-02 19:46:10,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:46:10,344 INFO L225 Difference]: With dead ends: 191 [2023-12-02 19:46:10,344 INFO L226 Difference]: Without dead ends: 68 [2023-12-02 19:46:10,344 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 200 GetRequests, 158 SyntacticMatches, 11 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 440 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=227, Invalid=829, Unknown=0, NotChecked=0, Total=1056 [2023-12-02 19:46:10,345 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 4 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 313 mSolverCounterSat, 306 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 619 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 306 IncrementalHoareTripleChecker+Valid, 313 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 19:46:10,345 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 13 Invalid, 619 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [306 Valid, 313 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 19:46:10,345 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2023-12-02 19:46:10,375 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2023-12-02 19:46:10,376 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 67 states have (on average 1.1343283582089552) internal successors, (76), 67 states have internal predecessors, (76), 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 19:46:10,376 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 76 transitions. [2023-12-02 19:46:10,376 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 76 transitions. Word has length 59 [2023-12-02 19:46:10,376 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:46:10,376 INFO L495 AbstractCegarLoop]: Abstraction has 68 states and 76 transitions. [2023-12-02 19:46:10,376 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 2.217391304347826) internal successors, (51), 23 states have internal predecessors, (51), 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 19:46:10,376 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 76 transitions. [2023-12-02 19:46:10,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2023-12-02 19:46:10,377 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:46:10,377 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:46:10,381 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2023-12-02 19:46:10,577 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:46:10,577 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:46:10,578 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:46:10,578 INFO L85 PathProgramCache]: Analyzing trace with hash -1618898317, now seen corresponding path program 12 times [2023-12-02 19:46:10,578 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:46:10,578 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1662408241] [2023-12-02 19:46:10,578 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:46:10,578 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:46:10,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:46:19,318 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 5 proven. 184 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:46:19,318 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:46:19,318 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1662408241] [2023-12-02 19:46:19,318 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1662408241] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:46:19,318 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [110138624] [2023-12-02 19:46:19,318 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 19:46:19,318 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:46:19,318 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:46:19,319 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:46:19,320 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-12-02 19:46:19,433 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 19:46:19,433 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 19:46:19,438 WARN L260 TraceCheckSpWp]: Trace formula consists of 357 conjuncts, 208 conjunts are in the unsatisfiable core [2023-12-02 19:46:19,442 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:46:20,804 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 6 proven. 168 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-12-02 19:46:20,805 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:46:23,458 INFO L349 Elim1Store]: treesize reduction 80, result has 78.4 percent of original size [2023-12-02 19:46:23,458 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 12 select indices, 12 select index equivalence classes, 0 disjoint index pairs (out of 66 index pairs), introduced 12 new quantified variables, introduced 66 case distinctions, treesize of input 103 treesize of output 307 [2023-12-02 19:46:28,555 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 0 proven. 174 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-12-02 19:46:28,555 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [110138624] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:46:28,555 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [879163970] [2023-12-02 19:46:28,557 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 19:46:28,557 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:46:28,557 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:46:28,557 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:46:28,557 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:46:28,767 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:46:29,373 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7520#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 19:46:29,373 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:46:29,374 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 19:46:29,374 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 20, 25] total 94 [2023-12-02 19:46:29,374 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [49845030] [2023-12-02 19:46:29,374 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 19:46:29,375 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 94 states [2023-12-02 19:46:29,375 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:46:29,376 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 94 interpolants. [2023-12-02 19:46:29,379 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=553, Invalid=9149, Unknown=0, NotChecked=0, Total=9702 [2023-12-02 19:46:29,379 INFO L87 Difference]: Start difference. First operand 68 states and 76 transitions. Second operand has 94 states, 94 states have (on average 1.9893617021276595) internal successors, (187), 94 states have internal predecessors, (187), 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 19:46:46,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:46:46,125 INFO L93 Difference]: Finished difference Result 434 states and 516 transitions. [2023-12-02 19:46:46,125 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 107 states. [2023-12-02 19:46:46,125 INFO L78 Accepts]: Start accepts. Automaton has has 94 states, 94 states have (on average 1.9893617021276595) internal successors, (187), 94 states have internal predecessors, (187), 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 67 [2023-12-02 19:46:46,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:46:46,127 INFO L225 Difference]: With dead ends: 434 [2023-12-02 19:46:46,127 INFO L226 Difference]: Without dead ends: 322 [2023-12-02 19:46:46,130 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 361 GetRequests, 168 SyntacticMatches, 0 SemanticMatches, 193 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10323 ImplicationChecksByTransitivity, 17.3s TimeCoverageRelationStatistics Valid=3335, Invalid=34495, Unknown=0, NotChecked=0, Total=37830 [2023-12-02 19:46:46,130 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 106 mSDsluCounter, 174 mSDsCounter, 0 mSdLazyCounter, 5922 mSolverCounterSat, 1957 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 106 SdHoareTripleChecker+Valid, 179 SdHoareTripleChecker+Invalid, 7879 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1957 IncrementalHoareTripleChecker+Valid, 5922 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.9s IncrementalHoareTripleChecker+Time [2023-12-02 19:46:46,130 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [106 Valid, 179 Invalid, 7879 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1957 Valid, 5922 Invalid, 0 Unknown, 0 Unchecked, 4.9s Time] [2023-12-02 19:46:46,131 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 322 states. [2023-12-02 19:46:46,253 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 322 to 206. [2023-12-02 19:46:46,254 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 206 states, 205 states have (on average 1.1951219512195121) internal successors, (245), 205 states have internal predecessors, (245), 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 19:46:46,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 206 states to 206 states and 245 transitions. [2023-12-02 19:46:46,255 INFO L78 Accepts]: Start accepts. Automaton has 206 states and 245 transitions. Word has length 67 [2023-12-02 19:46:46,255 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:46:46,255 INFO L495 AbstractCegarLoop]: Abstraction has 206 states and 245 transitions. [2023-12-02 19:46:46,255 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 94 states, 94 states have (on average 1.9893617021276595) internal successors, (187), 94 states have internal predecessors, (187), 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 19:46:46,256 INFO L276 IsEmpty]: Start isEmpty. Operand 206 states and 245 transitions. [2023-12-02 19:46:46,256 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2023-12-02 19:46:46,256 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:46:46,256 INFO L195 NwaCegarLoop]: trace histogram [9, 7, 7, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:46:46,261 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2023-12-02 19:46:46,457 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2023-12-02 19:46:46,457 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:46:46,457 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:46:46,457 INFO L85 PathProgramCache]: Analyzing trace with hash -1656988809, now seen corresponding path program 13 times [2023-12-02 19:46:46,457 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:46:46,458 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1040983087] [2023-12-02 19:46:46,458 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:46:46,458 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:46:46,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:46:46,688 INFO L134 CoverageAnalysis]: Checked inductivity of 227 backedges. 15 proven. 34 refuted. 0 times theorem prover too weak. 178 trivial. 0 not checked. [2023-12-02 19:46:46,688 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:46:46,688 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1040983087] [2023-12-02 19:46:46,688 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1040983087] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:46:46,688 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [875977153] [2023-12-02 19:46:46,688 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 19:46:46,688 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:46:46,689 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:46:46,689 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:46:46,692 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-12-02 19:46:46,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:46:46,801 INFO L262 TraceCheckSpWp]: Trace formula consists of 384 conjuncts, 18 conjunts are in the unsatisfiable core [2023-12-02 19:46:46,803 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:46:47,040 INFO L134 CoverageAnalysis]: Checked inductivity of 227 backedges. 44 proven. 28 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2023-12-02 19:46:47,040 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:46:47,302 INFO L134 CoverageAnalysis]: Checked inductivity of 227 backedges. 44 proven. 28 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2023-12-02 19:46:47,302 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [875977153] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:46:47,302 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [72375233] [2023-12-02 19:46:47,303 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 19:46:47,303 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:46:47,304 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:46:47,304 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:46:47,304 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:46:47,472 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:46:47,641 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9439#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 19:46:47,642 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:46:47,642 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 19:46:47,642 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 18, 18] total 41 [2023-12-02 19:46:47,642 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [443548311] [2023-12-02 19:46:47,642 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 19:46:47,642 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2023-12-02 19:46:47,643 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:46:47,643 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2023-12-02 19:46:47,644 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=326, Invalid=1744, Unknown=0, NotChecked=0, Total=2070 [2023-12-02 19:46:47,644 INFO L87 Difference]: Start difference. First operand 206 states and 245 transitions. Second operand has 41 states, 41 states have (on average 1.5853658536585367) internal successors, (65), 41 states have internal predecessors, (65), 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 19:46:48,684 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:46:48,685 INFO L93 Difference]: Finished difference Result 430 states and 527 transitions. [2023-12-02 19:46:48,685 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2023-12-02 19:46:48,685 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.5853658536585367) internal successors, (65), 41 states have internal predecessors, (65), 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 72 [2023-12-02 19:46:48,685 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:46:48,686 INFO L225 Difference]: With dead ends: 430 [2023-12-02 19:46:48,687 INFO L226 Difference]: Without dead ends: 242 [2023-12-02 19:46:48,688 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 179 SyntacticMatches, 8 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1409 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=764, Invalid=4066, Unknown=0, NotChecked=0, Total=4830 [2023-12-02 19:46:48,689 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 138 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 899 mSolverCounterSat, 760 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 138 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 1659 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 760 IncrementalHoareTripleChecker+Valid, 899 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-12-02 19:46:48,689 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [138 Valid, 27 Invalid, 1659 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [760 Valid, 899 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-12-02 19:46:48,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 242 states. [2023-12-02 19:46:48,794 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 242 to 149. [2023-12-02 19:46:48,794 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 149 states, 148 states have (on average 1.114864864864865) internal successors, (165), 148 states have internal predecessors, (165), 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 19:46:48,795 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 165 transitions. [2023-12-02 19:46:48,795 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 165 transitions. Word has length 72 [2023-12-02 19:46:48,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:46:48,795 INFO L495 AbstractCegarLoop]: Abstraction has 149 states and 165 transitions. [2023-12-02 19:46:48,795 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 1.5853658536585367) internal successors, (65), 41 states have internal predecessors, (65), 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 19:46:48,795 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 165 transitions. [2023-12-02 19:46:48,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2023-12-02 19:46:48,795 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:46:48,796 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:46:48,800 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2023-12-02 19:46:48,996 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:46:48,996 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:46:48,996 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:46:48,996 INFO L85 PathProgramCache]: Analyzing trace with hash 1761519571, now seen corresponding path program 14 times [2023-12-02 19:46:48,996 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:46:48,997 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [718208648] [2023-12-02 19:46:48,997 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:46:48,997 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:46:49,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:47:00,599 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 16 proven. 236 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:47:00,599 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:47:00,599 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [718208648] [2023-12-02 19:47:00,599 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [718208648] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:47:00,599 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [804192059] [2023-12-02 19:47:00,600 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 19:47:00,600 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:47:00,600 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:47:00,601 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:47:00,601 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2023-12-02 19:47:00,799 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2023-12-02 19:47:00,799 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 19:47:00,805 WARN L260 TraceCheckSpWp]: Trace formula consists of 404 conjuncts, 263 conjunts are in the unsatisfiable core [2023-12-02 19:47:00,810 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:47:01,043 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-12-02 19:47:01,113 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 18 [2023-12-02 19:47:12,211 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 19:47:12,212 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 19:47:12,214 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 19:47:12,244 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 19:47:12,244 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 9 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 50 treesize of output 64 [2023-12-02 19:47:12,431 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 252 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:47:12,432 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:47:15,298 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-12-02 19:47:15,298 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [804192059] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:47:15,298 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [524313966] [2023-12-02 19:47:15,299 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 19:47:15,299 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:47:15,300 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:47:15,300 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:47:15,300 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:47:15,464 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:47:16,006 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11189#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 19:47:16,007 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:47:16,007 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 19:47:16,007 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 28, 20] total 105 [2023-12-02 19:47:16,007 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1061272851] [2023-12-02 19:47:16,007 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 19:47:16,008 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 105 states [2023-12-02 19:47:16,008 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:47:16,009 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 105 interpolants. [2023-12-02 19:47:16,011 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=812, Invalid=11176, Unknown=2, NotChecked=0, Total=11990 [2023-12-02 19:47:16,011 INFO L87 Difference]: Start difference. First operand 149 states and 165 transitions. Second operand has 105 states, 105 states have (on average 2.057142857142857) internal successors, (216), 105 states have internal predecessors, (216), 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 19:47:34,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:47:34,453 INFO L93 Difference]: Finished difference Result 360 states and 410 transitions. [2023-12-02 19:47:34,453 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2023-12-02 19:47:34,453 INFO L78 Accepts]: Start accepts. Automaton has has 105 states, 105 states have (on average 2.057142857142857) internal successors, (216), 105 states have internal predecessors, (216), 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 76 [2023-12-02 19:47:34,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:47:34,454 INFO L225 Difference]: With dead ends: 360 [2023-12-02 19:47:34,454 INFO L226 Difference]: Without dead ends: 173 [2023-12-02 19:47:34,456 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 372 GetRequests, 183 SyntacticMatches, 10 SemanticMatches, 179 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9968 ImplicationChecksByTransitivity, 28.1s TimeCoverageRelationStatistics Valid=3508, Invalid=29070, Unknown=2, NotChecked=0, Total=32580 [2023-12-02 19:47:34,456 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 320 mSDsluCounter, 80 mSDsCounter, 0 mSdLazyCounter, 6377 mSolverCounterSat, 3339 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 320 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 9716 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3339 IncrementalHoareTripleChecker+Valid, 6377 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.5s IncrementalHoareTripleChecker+Time [2023-12-02 19:47:34,457 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [320 Valid, 83 Invalid, 9716 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3339 Valid, 6377 Invalid, 0 Unknown, 0 Unchecked, 6.5s Time] [2023-12-02 19:47:34,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2023-12-02 19:47:34,574 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 159. [2023-12-02 19:47:34,574 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 159 states, 158 states have (on average 1.2151898734177216) internal successors, (192), 158 states have internal predecessors, (192), 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 19:47:34,575 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 192 transitions. [2023-12-02 19:47:34,575 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 192 transitions. Word has length 76 [2023-12-02 19:47:34,575 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:47:34,575 INFO L495 AbstractCegarLoop]: Abstraction has 159 states and 192 transitions. [2023-12-02 19:47:34,576 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 105 states, 105 states have (on average 2.057142857142857) internal successors, (216), 105 states have internal predecessors, (216), 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 19:47:34,576 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 192 transitions. [2023-12-02 19:47:34,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2023-12-02 19:47:34,576 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:47:34,576 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:47:34,583 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2023-12-02 19:47:34,777 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:47:34,777 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:47:34,778 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:47:34,778 INFO L85 PathProgramCache]: Analyzing trace with hash -346914445, now seen corresponding path program 15 times [2023-12-02 19:47:34,778 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:47:34,778 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1879686803] [2023-12-02 19:47:34,778 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:47:34,778 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:47:35,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:47:50,298 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 32 proven. 292 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:47:50,298 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:47:50,298 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1879686803] [2023-12-02 19:47:50,298 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1879686803] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:47:50,298 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1686939039] [2023-12-02 19:47:50,298 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 19:47:50,298 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:47:50,298 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:47:50,299 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:47:50,300 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2023-12-02 19:47:50,436 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 19:47:50,436 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 19:47:50,441 WARN L260 TraceCheckSpWp]: Trace formula consists of 451 conjuncts, 270 conjunts are in the unsatisfiable core [2023-12-02 19:47:50,446 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:47:50,535 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-12-02 19:47:53,230 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 8 proven. 288 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2023-12-02 19:47:53,230 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:47:56,010 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 288 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-12-02 19:47:56,010 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1686939039] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:47:56,011 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1147488909] [2023-12-02 19:47:56,012 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 19:47:56,012 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:47:56,012 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:47:56,012 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:47:56,013 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:47:56,190 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:47:56,801 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12971#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 19:47:56,801 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:47:56,801 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 19:47:56,801 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [73, 23, 21] total 110 [2023-12-02 19:47:56,802 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [303369045] [2023-12-02 19:47:56,802 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 19:47:56,802 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 110 states [2023-12-02 19:47:56,802 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:47:56,803 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 110 interpolants. [2023-12-02 19:47:56,804 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=540, Invalid=12570, Unknown=0, NotChecked=0, Total=13110 [2023-12-02 19:47:56,804 INFO L87 Difference]: Start difference. First operand 159 states and 192 transitions. Second operand has 110 states, 110 states have (on average 2.1454545454545455) internal successors, (236), 110 states have internal predecessors, (236), 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 19:48:24,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:48:24,278 INFO L93 Difference]: Finished difference Result 544 states and 723 transitions. [2023-12-02 19:48:24,279 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 104 states. [2023-12-02 19:48:24,279 INFO L78 Accepts]: Start accepts. Automaton has has 110 states, 110 states have (on average 2.1454545454545455) internal successors, (236), 110 states have internal predecessors, (236), 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 85 [2023-12-02 19:48:24,279 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:48:24,281 INFO L225 Difference]: With dead ends: 544 [2023-12-02 19:48:24,282 INFO L226 Difference]: Without dead ends: 539 [2023-12-02 19:48:24,284 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 438 GetRequests, 224 SyntacticMatches, 0 SemanticMatches, 214 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12448 ImplicationChecksByTransitivity, 26.4s TimeCoverageRelationStatistics Valid=4300, Invalid=42140, Unknown=0, NotChecked=0, Total=46440 [2023-12-02 19:48:24,284 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 400 mSDsluCounter, 100 mSDsCounter, 0 mSdLazyCounter, 9028 mSolverCounterSat, 3487 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 400 SdHoareTripleChecker+Valid, 103 SdHoareTripleChecker+Invalid, 12515 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3487 IncrementalHoareTripleChecker+Valid, 9028 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 9.3s IncrementalHoareTripleChecker+Time [2023-12-02 19:48:24,284 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [400 Valid, 103 Invalid, 12515 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3487 Valid, 9028 Invalid, 0 Unknown, 0 Unchecked, 9.3s Time] [2023-12-02 19:48:24,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 539 states. [2023-12-02 19:48:24,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 539 to 215. [2023-12-02 19:48:24,484 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 215 states, 214 states have (on average 1.3037383177570094) internal successors, (279), 214 states have internal predecessors, (279), 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 19:48:24,485 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 215 states to 215 states and 279 transitions. [2023-12-02 19:48:24,485 INFO L78 Accepts]: Start accepts. Automaton has 215 states and 279 transitions. Word has length 85 [2023-12-02 19:48:24,485 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:48:24,485 INFO L495 AbstractCegarLoop]: Abstraction has 215 states and 279 transitions. [2023-12-02 19:48:24,485 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 110 states, 110 states have (on average 2.1454545454545455) internal successors, (236), 110 states have internal predecessors, (236), 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 19:48:24,485 INFO L276 IsEmpty]: Start isEmpty. Operand 215 states and 279 transitions. [2023-12-02 19:48:24,486 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2023-12-02 19:48:24,486 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:48:24,486 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:48:24,491 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2023-12-02 19:48:24,686 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2023-12-02 19:48:24,687 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:48:24,687 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:48:24,687 INFO L85 PathProgramCache]: Analyzing trace with hash 2130288931, now seen corresponding path program 16 times [2023-12-02 19:48:24,687 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:48:24,687 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [360034434] [2023-12-02 19:48:24,687 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:48:24,687 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:48:24,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:48:24,979 INFO L134 CoverageAnalysis]: Checked inductivity of 333 backedges. 37 proven. 44 refuted. 0 times theorem prover too weak. 252 trivial. 0 not checked. [2023-12-02 19:48:24,979 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:48:24,980 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [360034434] [2023-12-02 19:48:24,980 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [360034434] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:48:24,980 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [305149559] [2023-12-02 19:48:24,980 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 19:48:24,980 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:48:24,980 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:48:24,981 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:48:24,982 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2023-12-02 19:48:25,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:48:25,103 INFO L262 TraceCheckSpWp]: Trace formula consists of 456 conjuncts, 20 conjunts are in the unsatisfiable core [2023-12-02 19:48:25,104 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:48:25,325 INFO L134 CoverageAnalysis]: Checked inductivity of 333 backedges. 45 proven. 36 refuted. 0 times theorem prover too weak. 252 trivial. 0 not checked. [2023-12-02 19:48:25,325 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:48:25,500 INFO L134 CoverageAnalysis]: Checked inductivity of 333 backedges. 45 proven. 36 refuted. 0 times theorem prover too weak. 252 trivial. 0 not checked. [2023-12-02 19:48:25,501 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [305149559] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:48:25,501 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [551975919] [2023-12-02 19:48:25,502 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 19:48:25,502 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:48:25,502 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:48:25,502 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:48:25,502 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:48:25,669 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:48:25,842 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15220#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 19:48:25,842 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:48:25,842 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 19:48:25,842 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 32 [2023-12-02 19:48:25,843 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1243248478] [2023-12-02 19:48:25,843 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 19:48:25,843 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2023-12-02 19:48:25,843 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:48:25,843 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2023-12-02 19:48:25,844 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=288, Invalid=1044, Unknown=0, NotChecked=0, Total=1332 [2023-12-02 19:48:25,844 INFO L87 Difference]: Start difference. First operand 215 states and 279 transitions. Second operand has 32 states, 32 states have (on average 1.59375) internal successors, (51), 32 states have internal predecessors, (51), 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 19:48:26,681 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:48:26,681 INFO L93 Difference]: Finished difference Result 504 states and 644 transitions. [2023-12-02 19:48:26,681 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2023-12-02 19:48:26,682 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.59375) internal successors, (51), 32 states have internal predecessors, (51), 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 86 [2023-12-02 19:48:26,682 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:48:26,683 INFO L225 Difference]: With dead ends: 504 [2023-12-02 19:48:26,683 INFO L226 Difference]: Without dead ends: 210 [2023-12-02 19:48:26,683 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 287 GetRequests, 225 SyntacticMatches, 17 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 907 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=473, Invalid=1689, Unknown=0, NotChecked=0, Total=2162 [2023-12-02 19:48:26,684 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 18 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 467 mSolverCounterSat, 502 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 969 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 502 IncrementalHoareTripleChecker+Valid, 467 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 19:48:26,684 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 29 Invalid, 969 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [502 Valid, 467 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 19:48:26,684 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 210 states. [2023-12-02 19:48:26,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 210 to 195. [2023-12-02 19:48:26,875 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 195 states, 194 states have (on average 1.2835051546391754) internal successors, (249), 194 states have internal predecessors, (249), 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 19:48:26,876 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 195 states to 195 states and 249 transitions. [2023-12-02 19:48:26,876 INFO L78 Accepts]: Start accepts. Automaton has 195 states and 249 transitions. Word has length 86 [2023-12-02 19:48:26,876 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:48:26,876 INFO L495 AbstractCegarLoop]: Abstraction has 195 states and 249 transitions. [2023-12-02 19:48:26,876 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 1.59375) internal successors, (51), 32 states have internal predecessors, (51), 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 19:48:26,876 INFO L276 IsEmpty]: Start isEmpty. Operand 195 states and 249 transitions. [2023-12-02 19:48:26,877 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2023-12-02 19:48:26,877 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:48:26,877 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:48:26,882 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2023-12-02 19:48:27,077 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2023-12-02 19:48:27,078 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:48:27,078 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:48:27,078 INFO L85 PathProgramCache]: Analyzing trace with hash -1769927725, now seen corresponding path program 17 times [2023-12-02 19:48:27,078 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:48:27,078 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [339851931] [2023-12-02 19:48:27,078 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:48:27,078 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:48:27,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:48:47,556 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 24 proven. 381 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:48:47,557 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:48:47,557 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [339851931] [2023-12-02 19:48:47,557 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [339851931] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:48:47,557 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [333601692] [2023-12-02 19:48:47,557 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 19:48:47,557 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:48:47,557 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:48:47,558 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:48:47,560 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2023-12-02 19:48:47,795 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2023-12-02 19:48:47,795 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 19:48:47,803 WARN L260 TraceCheckSpWp]: Trace formula consists of 498 conjuncts, 320 conjunts are in the unsatisfiable core [2023-12-02 19:48:47,809 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:48:47,894 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2023-12-02 19:48:47,979 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 24 [2023-12-02 19:48:55,852 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 19:48:55,855 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 19:48:55,856 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 19:48:55,858 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 19:48:55,860 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 19:48:55,861 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 19:48:55,904 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 19:48:55,904 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 18 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 80 treesize of output 118 [2023-12-02 19:48:56,204 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 16 proven. 361 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2023-12-02 19:48:56,204 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:49:06,930 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 0 proven. 390 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-12-02 19:49:06,930 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [333601692] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:49:06,930 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1032227943] [2023-12-02 19:49:06,931 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 19:49:06,931 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:49:06,932 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:49:06,932 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:49:06,932 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:49:07,120 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:49:07,998 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '17356#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 19:49:07,998 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:49:07,998 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 19:49:07,999 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [82, 47, 51] total 174 [2023-12-02 19:49:07,999 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1203588833] [2023-12-02 19:49:07,999 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 19:49:07,999 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 174 states [2023-12-02 19:49:07,999 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:49:08,001 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 174 interpolants. [2023-12-02 19:49:08,002 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1635, Invalid=30227, Unknown=0, NotChecked=0, Total=31862 [2023-12-02 19:49:08,002 INFO L87 Difference]: Start difference. First operand 195 states and 249 transitions. Second operand has 174 states, 174 states have (on average 1.5344827586206897) internal successors, (267), 174 states have internal predecessors, (267), 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 19:49:37,681 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:49:37,681 INFO L93 Difference]: Finished difference Result 525 states and 647 transitions. [2023-12-02 19:49:37,682 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 103 states. [2023-12-02 19:49:37,682 INFO L78 Accepts]: Start accepts. Automaton has has 174 states, 174 states have (on average 1.5344827586206897) internal successors, (267), 174 states have internal predecessors, (267), 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 94 [2023-12-02 19:49:37,682 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:49:37,684 INFO L225 Difference]: With dead ends: 525 [2023-12-02 19:49:37,684 INFO L226 Difference]: Without dead ends: 350 [2023-12-02 19:49:37,686 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 457 GetRequests, 188 SyntacticMatches, 8 SemanticMatches, 261 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21203 ImplicationChecksByTransitivity, 45.4s TimeCoverageRelationStatistics Valid=3960, Invalid=64945, Unknown=1, NotChecked=0, Total=68906 [2023-12-02 19:49:37,687 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 57 mSDsluCounter, 122 mSDsCounter, 0 mSdLazyCounter, 6922 mSolverCounterSat, 803 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 125 SdHoareTripleChecker+Invalid, 7725 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 803 IncrementalHoareTripleChecker+Valid, 6922 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.2s IncrementalHoareTripleChecker+Time [2023-12-02 19:49:37,687 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [57 Valid, 125 Invalid, 7725 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [803 Valid, 6922 Invalid, 0 Unknown, 0 Unchecked, 7.2s Time] [2023-12-02 19:49:37,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 350 states. [2023-12-02 19:49:37,967 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 350 to 277. [2023-12-02 19:49:37,967 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 277 states, 276 states have (on average 1.2246376811594204) internal successors, (338), 276 states have internal predecessors, (338), 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 19:49:37,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 277 states to 277 states and 338 transitions. [2023-12-02 19:49:37,968 INFO L78 Accepts]: Start accepts. Automaton has 277 states and 338 transitions. Word has length 94 [2023-12-02 19:49:37,968 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:49:37,968 INFO L495 AbstractCegarLoop]: Abstraction has 277 states and 338 transitions. [2023-12-02 19:49:37,969 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 174 states, 174 states have (on average 1.5344827586206897) internal successors, (267), 174 states have internal predecessors, (267), 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 19:49:37,969 INFO L276 IsEmpty]: Start isEmpty. Operand 277 states and 338 transitions. [2023-12-02 19:49:37,969 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2023-12-02 19:49:37,969 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:49:37,970 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:49:37,975 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2023-12-02 19:49:38,170 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:49:38,170 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:49:38,171 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:49:38,171 INFO L85 PathProgramCache]: Analyzing trace with hash 325137410, now seen corresponding path program 18 times [2023-12-02 19:49:38,171 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:49:38,171 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [426937767] [2023-12-02 19:49:38,171 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:49:38,171 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:49:38,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:49:38,509 INFO L134 CoverageAnalysis]: Checked inductivity of 415 backedges. 46 proven. 54 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2023-12-02 19:49:38,509 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:49:38,509 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [426937767] [2023-12-02 19:49:38,509 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [426937767] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:49:38,509 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [18353737] [2023-12-02 19:49:38,509 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 19:49:38,509 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:49:38,509 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:49:38,510 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:49:38,511 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2023-12-02 19:49:38,630 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 19:49:38,630 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 19:49:38,633 INFO L262 TraceCheckSpWp]: Trace formula consists of 462 conjuncts, 22 conjunts are in the unsatisfiable core [2023-12-02 19:49:38,635 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:49:38,845 INFO L134 CoverageAnalysis]: Checked inductivity of 415 backedges. 55 proven. 45 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2023-12-02 19:49:38,845 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:49:39,022 INFO L134 CoverageAnalysis]: Checked inductivity of 415 backedges. 55 proven. 45 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2023-12-02 19:49:39,022 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [18353737] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:49:39,022 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1004129446] [2023-12-02 19:49:39,023 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 19:49:39,023 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:49:39,023 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:49:39,023 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:49:39,024 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:49:39,227 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:49:39,416 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19717#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 19:49:39,416 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:49:39,417 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 19:49:39,417 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 35 [2023-12-02 19:49:39,417 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [745482137] [2023-12-02 19:49:39,417 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 19:49:39,417 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2023-12-02 19:49:39,418 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:49:39,418 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2023-12-02 19:49:39,418 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=325, Invalid=1235, Unknown=0, NotChecked=0, Total=1560 [2023-12-02 19:49:39,418 INFO L87 Difference]: Start difference. First operand 277 states and 338 transitions. Second operand has 35 states, 35 states have (on average 1.8571428571428572) internal successors, (65), 35 states have internal predecessors, (65), 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 19:49:40,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:49:40,739 INFO L93 Difference]: Finished difference Result 586 states and 707 transitions. [2023-12-02 19:49:40,739 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2023-12-02 19:49:40,739 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.8571428571428572) internal successors, (65), 35 states have internal predecessors, (65), 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 95 [2023-12-02 19:49:40,739 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:49:40,741 INFO L225 Difference]: With dead ends: 586 [2023-12-02 19:49:40,741 INFO L226 Difference]: Without dead ends: 349 [2023-12-02 19:49:40,742 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 320 GetRequests, 249 SyntacticMatches, 19 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1128 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=609, Invalid=2253, Unknown=0, NotChecked=0, Total=2862 [2023-12-02 19:49:40,743 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 95 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 548 mSolverCounterSat, 598 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 95 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 1146 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 598 IncrementalHoareTripleChecker+Valid, 548 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-12-02 19:49:40,743 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [95 Valid, 39 Invalid, 1146 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [598 Valid, 548 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-12-02 19:49:40,744 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 349 states. [2023-12-02 19:49:41,108 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 349 to 321. [2023-12-02 19:49:41,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 321 states, 320 states have (on average 1.19375) internal successors, (382), 320 states have internal predecessors, (382), 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 19:49:41,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 321 states to 321 states and 382 transitions. [2023-12-02 19:49:41,109 INFO L78 Accepts]: Start accepts. Automaton has 321 states and 382 transitions. Word has length 95 [2023-12-02 19:49:41,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:49:41,109 INFO L495 AbstractCegarLoop]: Abstraction has 321 states and 382 transitions. [2023-12-02 19:49:41,109 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.8571428571428572) internal successors, (65), 35 states have internal predecessors, (65), 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 19:49:41,110 INFO L276 IsEmpty]: Start isEmpty. Operand 321 states and 382 transitions. [2023-12-02 19:49:41,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2023-12-02 19:49:41,110 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:49:41,110 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:49:41,114 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2023-12-02 19:49:41,310 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:49:41,311 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:49:41,311 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:49:41,311 INFO L85 PathProgramCache]: Analyzing trace with hash -39042816, now seen corresponding path program 19 times [2023-12-02 19:49:41,311 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:49:41,311 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1050437719] [2023-12-02 19:49:41,311 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:49:41,311 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:49:41,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:49:41,653 INFO L134 CoverageAnalysis]: Checked inductivity of 425 backedges. 36 proven. 64 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2023-12-02 19:49:41,653 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:49:41,653 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1050437719] [2023-12-02 19:49:41,653 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1050437719] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:49:41,653 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1987146801] [2023-12-02 19:49:41,653 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 19:49:41,653 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:49:41,654 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:49:41,654 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:49:41,658 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2023-12-02 19:49:41,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:49:41,772 INFO L262 TraceCheckSpWp]: Trace formula consists of 510 conjuncts, 22 conjunts are in the unsatisfiable core [2023-12-02 19:49:41,774 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:49:41,940 INFO L134 CoverageAnalysis]: Checked inductivity of 425 backedges. 45 proven. 55 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2023-12-02 19:49:41,940 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:49:42,115 INFO L134 CoverageAnalysis]: Checked inductivity of 425 backedges. 45 proven. 55 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2023-12-02 19:49:42,115 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1987146801] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:49:42,115 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [127908575] [2023-12-02 19:49:42,117 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 19:49:42,117 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:49:42,117 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:49:42,117 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:49:42,117 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:49:42,292 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:49:42,415 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '22138#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 19:49:42,415 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:49:42,415 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 19:49:42,415 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 35 [2023-12-02 19:49:42,415 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1453554933] [2023-12-02 19:49:42,416 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 19:49:42,416 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2023-12-02 19:49:42,416 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:49:42,417 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2023-12-02 19:49:42,417 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=303, Invalid=1179, Unknown=0, NotChecked=0, Total=1482 [2023-12-02 19:49:42,417 INFO L87 Difference]: Start difference. First operand 321 states and 382 transitions. Second operand has 35 states, 35 states have (on average 1.542857142857143) internal successors, (54), 35 states have internal predecessors, (54), 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 19:49:43,149 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:49:43,149 INFO L93 Difference]: Finished difference Result 334 states and 397 transitions. [2023-12-02 19:49:43,149 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2023-12-02 19:49:43,150 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.542857142857143) internal successors, (54), 35 states have internal predecessors, (54), 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 96 [2023-12-02 19:49:43,150 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:49:43,151 INFO L225 Difference]: With dead ends: 334 [2023-12-02 19:49:43,151 INFO L226 Difference]: Without dead ends: 212 [2023-12-02 19:49:43,151 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 321 GetRequests, 252 SyntacticMatches, 20 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1187 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=509, Invalid=2041, Unknown=0, NotChecked=0, Total=2550 [2023-12-02 19:49:43,152 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 32 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 652 mSolverCounterSat, 431 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 1083 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 431 IncrementalHoareTripleChecker+Valid, 652 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 19:49:43,152 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [32 Valid, 9 Invalid, 1083 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [431 Valid, 652 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 19:49:43,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 212 states. [2023-12-02 19:49:43,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 212 to 104. [2023-12-02 19:49:43,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 103 states have (on average 1.087378640776699) internal successors, (112), 103 states have internal predecessors, (112), 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 19:49:43,283 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 112 transitions. [2023-12-02 19:49:43,283 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 112 transitions. Word has length 96 [2023-12-02 19:49:43,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:49:43,283 INFO L495 AbstractCegarLoop]: Abstraction has 104 states and 112 transitions. [2023-12-02 19:49:43,283 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.542857142857143) internal successors, (54), 35 states have internal predecessors, (54), 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 19:49:43,284 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 112 transitions. [2023-12-02 19:49:43,284 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2023-12-02 19:49:43,284 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:49:43,284 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:49:43,289 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2023-12-02 19:49:43,485 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2023-12-02 19:49:43,485 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:49:43,485 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:49:43,485 INFO L85 PathProgramCache]: Analyzing trace with hash 106737779, now seen corresponding path program 20 times [2023-12-02 19:49:43,485 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:49:43,485 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1992333942] [2023-12-02 19:49:43,485 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:49:43,486 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:49:43,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:50:09,912 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 49 proven. 446 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:50:09,912 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:50:09,912 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1992333942] [2023-12-02 19:50:09,912 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1992333942] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:50:09,912 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [506359010] [2023-12-02 19:50:09,912 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 19:50:09,912 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:50:09,912 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:50:09,913 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:50:09,914 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2023-12-02 19:50:10,150 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2023-12-02 19:50:10,150 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 19:50:10,158 WARN L260 TraceCheckSpWp]: Trace formula consists of 545 conjuncts, 365 conjunts are in the unsatisfiable core [2023-12-02 19:50:10,164 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:50:10,754 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-12-02 19:50:10,854 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 18 [2023-12-02 19:50:16,146 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 19:50:16,146 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 19:50:16,148 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 19:50:16,149 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 19:50:16,150 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 19:50:16,151 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 19:50:16,191 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 19:50:16,192 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 18 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 64 treesize of output 98 [2023-12-02 19:50:16,453 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:50:16,453 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:50:21,339 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 450 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2023-12-02 19:50:21,339 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [506359010] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:50:21,339 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [162463090] [2023-12-02 19:50:21,341 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 19:50:21,341 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:50:21,341 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:50:21,341 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:50:21,341 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:50:21,535 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:50:22,383 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '23784#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 19:50:22,384 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:50:22,384 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 19:50:22,384 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [88, 37, 26] total 143 [2023-12-02 19:50:22,384 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1723636914] [2023-12-02 19:50:22,384 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 19:50:22,384 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 143 states [2023-12-02 19:50:22,384 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:50:22,385 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 143 interpolants. [2023-12-02 19:50:22,386 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1418, Invalid=20338, Unknown=0, NotChecked=0, Total=21756 [2023-12-02 19:50:22,387 INFO L87 Difference]: Start difference. First operand 104 states and 112 transitions. Second operand has 143 states, 143 states have (on average 2.055944055944056) internal successors, (294), 143 states have internal predecessors, (294), 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 19:50:49,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:50:49,395 INFO L93 Difference]: Finished difference Result 382 states and 421 transitions. [2023-12-02 19:50:49,396 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2023-12-02 19:50:49,396 INFO L78 Accepts]: Start accepts. Automaton has has 143 states, 143 states have (on average 2.055944055944056) internal successors, (294), 143 states have internal predecessors, (294), 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 103 [2023-12-02 19:50:49,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:50:49,398 INFO L225 Difference]: With dead ends: 382 [2023-12-02 19:50:49,398 INFO L226 Difference]: Without dead ends: 211 [2023-12-02 19:50:49,400 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 486 GetRequests, 254 SyntacticMatches, 9 SemanticMatches, 223 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15474 ImplicationChecksByTransitivity, 32.6s TimeCoverageRelationStatistics Valid=4842, Invalid=45558, Unknown=0, NotChecked=0, Total=50400 [2023-12-02 19:50:49,400 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 302 mSDsluCounter, 100 mSDsCounter, 0 mSdLazyCounter, 11081 mSolverCounterSat, 3176 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 302 SdHoareTripleChecker+Valid, 103 SdHoareTripleChecker+Invalid, 14257 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3176 IncrementalHoareTripleChecker+Valid, 11081 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 10.5s IncrementalHoareTripleChecker+Time [2023-12-02 19:50:49,400 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [302 Valid, 103 Invalid, 14257 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3176 Valid, 11081 Invalid, 0 Unknown, 0 Unchecked, 10.5s Time] [2023-12-02 19:50:49,401 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 211 states. [2023-12-02 19:50:49,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 211 to 106. [2023-12-02 19:50:49,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 105 states have (on average 1.0857142857142856) internal successors, (114), 105 states have internal predecessors, (114), 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 19:50:49,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 114 transitions. [2023-12-02 19:50:49,543 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 114 transitions. Word has length 103 [2023-12-02 19:50:49,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:50:49,543 INFO L495 AbstractCegarLoop]: Abstraction has 106 states and 114 transitions. [2023-12-02 19:50:49,543 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 143 states, 143 states have (on average 2.055944055944056) internal successors, (294), 143 states have internal predecessors, (294), 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 19:50:49,543 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 114 transitions. [2023-12-02 19:50:49,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2023-12-02 19:50:49,544 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:50:49,544 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:50:49,550 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2023-12-02 19:50:49,744 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2023-12-02 19:50:49,744 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:50:49,745 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:50:49,745 INFO L85 PathProgramCache]: Analyzing trace with hash 1333300368, now seen corresponding path program 21 times [2023-12-02 19:50:49,745 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:50:49,745 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1584297953] [2023-12-02 19:50:49,745 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:50:49,745 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:50:49,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:50:50,143 INFO L134 CoverageAnalysis]: Checked inductivity of 517 backedges. 45 proven. 76 refuted. 0 times theorem prover too weak. 396 trivial. 0 not checked. [2023-12-02 19:50:50,143 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:50:50,143 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1584297953] [2023-12-02 19:50:50,143 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1584297953] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:50:50,143 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1290994388] [2023-12-02 19:50:50,143 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 19:50:50,143 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:50:50,144 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:50:50,144 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:50:50,145 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2023-12-02 19:50:50,268 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 19:50:50,268 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 19:50:50,270 INFO L262 TraceCheckSpWp]: Trace formula consists of 516 conjuncts, 24 conjunts are in the unsatisfiable core [2023-12-02 19:50:50,272 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:50:50,765 INFO L134 CoverageAnalysis]: Checked inductivity of 517 backedges. 66 proven. 55 refuted. 0 times theorem prover too weak. 396 trivial. 0 not checked. [2023-12-02 19:50:50,765 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:50:51,210 INFO L134 CoverageAnalysis]: Checked inductivity of 517 backedges. 66 proven. 55 refuted. 0 times theorem prover too weak. 396 trivial. 0 not checked. [2023-12-02 19:50:51,210 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1290994388] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:50:51,210 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [621716936] [2023-12-02 19:50:51,212 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 19:50:51,212 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:50:51,212 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:50:51,212 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:50:51,212 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:50:51,380 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:50:51,600 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '25587#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 19:50:51,600 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:50:51,600 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 19:50:51,600 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 59 [2023-12-02 19:50:51,601 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [439162721] [2023-12-02 19:50:51,601 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 19:50:51,601 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2023-12-02 19:50:51,601 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:50:51,602 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2023-12-02 19:50:51,602 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=595, Invalid=3437, Unknown=0, NotChecked=0, Total=4032 [2023-12-02 19:50:51,602 INFO L87 Difference]: Start difference. First operand 106 states and 114 transitions. Second operand has 59 states, 59 states have (on average 1.5254237288135593) internal successors, (90), 59 states have internal predecessors, (90), 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 19:50:52,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:50:52,868 INFO L93 Difference]: Finished difference Result 194 states and 215 transitions. [2023-12-02 19:50:52,869 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2023-12-02 19:50:52,869 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 1.5254237288135593) internal successors, (90), 59 states have internal predecessors, (90), 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 105 [2023-12-02 19:50:52,869 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:50:52,870 INFO L225 Difference]: With dead ends: 194 [2023-12-02 19:50:52,870 INFO L226 Difference]: Without dead ends: 113 [2023-12-02 19:50:52,871 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 362 GetRequests, 265 SyntacticMatches, 12 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2558 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1010, Invalid=6472, Unknown=0, NotChecked=0, Total=7482 [2023-12-02 19:50:52,871 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 124 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 1431 mSolverCounterSat, 672 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 124 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 2103 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 672 IncrementalHoareTripleChecker+Valid, 1431 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-12-02 19:50:52,871 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [124 Valid, 25 Invalid, 2103 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [672 Valid, 1431 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-12-02 19:50:52,871 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2023-12-02 19:50:53,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 113. [2023-12-02 19:50:53,035 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 113 states, 112 states have (on average 1.0803571428571428) internal successors, (121), 112 states have internal predecessors, (121), 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 19:50:53,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 121 transitions. [2023-12-02 19:50:53,036 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 121 transitions. Word has length 105 [2023-12-02 19:50:53,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:50:53,036 INFO L495 AbstractCegarLoop]: Abstraction has 113 states and 121 transitions. [2023-12-02 19:50:53,036 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 59 states have (on average 1.5254237288135593) internal successors, (90), 59 states have internal predecessors, (90), 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 19:50:53,036 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 121 transitions. [2023-12-02 19:50:53,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2023-12-02 19:50:53,036 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:50:53,037 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 11, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:50:53,042 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2023-12-02 19:50:53,237 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2023-12-02 19:50:53,237 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:50:53,237 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:50:53,237 INFO L85 PathProgramCache]: Analyzing trace with hash 1019457491, now seen corresponding path program 22 times [2023-12-02 19:50:53,238 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:50:53,238 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1704161213] [2023-12-02 19:50:53,238 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:50:53,238 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:50:53,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:51:26,580 INFO L134 CoverageAnalysis]: Checked inductivity of 594 backedges. 72 proven. 522 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:51:26,580 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:51:26,580 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1704161213] [2023-12-02 19:51:26,580 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1704161213] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:51:26,580 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [474968441] [2023-12-02 19:51:26,580 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 19:51:26,580 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:51:26,581 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:51:26,581 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:51:26,582 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2023-12-02 19:51:26,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:51:26,747 WARN L260 TraceCheckSpWp]: Trace formula consists of 592 conjuncts, 386 conjunts are in the unsatisfiable core [2023-12-02 19:51:26,753 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:51:27,709 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-12-02 19:51:31,968 INFO L134 CoverageAnalysis]: Checked inductivity of 594 backedges. 0 proven. 594 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:51:31,968 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:51:37,762 INFO L134 CoverageAnalysis]: Checked inductivity of 594 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2023-12-02 19:51:37,763 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [474968441] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:51:37,763 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [461828114] [2023-12-02 19:51:37,764 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 19:51:37,764 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:51:37,764 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:51:37,764 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:51:37,764 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:51:37,937 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:51:38,851 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '27061#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 19:51:38,851 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:51:38,851 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 19:51:38,851 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [98, 39, 27] total 155 [2023-12-02 19:51:38,851 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [918675507] [2023-12-02 19:51:38,852 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 19:51:38,852 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 155 states [2023-12-02 19:51:38,852 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:51:38,853 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 155 interpolants. [2023-12-02 19:51:38,854 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=877, Invalid=24563, Unknown=0, NotChecked=0, Total=25440 [2023-12-02 19:51:38,855 INFO L87 Difference]: Start difference. First operand 113 states and 121 transitions. Second operand has 155 states, 155 states have (on average 2.0516129032258066) internal successors, (318), 155 states have internal predecessors, (318), 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 19:52:10,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:52:10,921 INFO L93 Difference]: Finished difference Result 310 states and 345 transitions. [2023-12-02 19:52:10,922 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2023-12-02 19:52:10,922 INFO L78 Accepts]: Start accepts. Automaton has has 155 states, 155 states have (on average 2.0516129032258066) internal successors, (318), 155 states have internal predecessors, (318), 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 112 [2023-12-02 19:52:10,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:52:10,924 INFO L225 Difference]: With dead ends: 310 [2023-12-02 19:52:10,924 INFO L226 Difference]: Without dead ends: 306 [2023-12-02 19:52:10,926 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 519 GetRequests, 287 SyntacticMatches, 0 SemanticMatches, 232 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16093 ImplicationChecksByTransitivity, 36.0s TimeCoverageRelationStatistics Valid=3940, Invalid=50582, Unknown=0, NotChecked=0, Total=54522 [2023-12-02 19:52:10,927 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 181 mSDsluCounter, 136 mSDsCounter, 0 mSdLazyCounter, 16580 mSolverCounterSat, 2397 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 12.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 181 SdHoareTripleChecker+Valid, 139 SdHoareTripleChecker+Invalid, 18977 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2397 IncrementalHoareTripleChecker+Valid, 16580 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 14.0s IncrementalHoareTripleChecker+Time [2023-12-02 19:52:10,927 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [181 Valid, 139 Invalid, 18977 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2397 Valid, 16580 Invalid, 0 Unknown, 0 Unchecked, 14.0s Time] [2023-12-02 19:52:10,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 306 states. [2023-12-02 19:52:11,100 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 306 to 114. [2023-12-02 19:52:11,100 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 114 states, 113 states have (on average 1.079646017699115) internal successors, (122), 113 states have internal predecessors, (122), 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 19:52:11,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 122 transitions. [2023-12-02 19:52:11,101 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 122 transitions. Word has length 112 [2023-12-02 19:52:11,101 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:52:11,101 INFO L495 AbstractCegarLoop]: Abstraction has 114 states and 122 transitions. [2023-12-02 19:52:11,101 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 155 states, 155 states have (on average 2.0516129032258066) internal successors, (318), 155 states have internal predecessors, (318), 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 19:52:11,101 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 122 transitions. [2023-12-02 19:52:11,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2023-12-02 19:52:11,102 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:52:11,102 INFO L195 NwaCegarLoop]: trace histogram [12, 11, 11, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:52:11,107 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2023-12-02 19:52:11,303 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2023-12-02 19:52:11,303 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:52:11,303 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:52:11,303 INFO L85 PathProgramCache]: Analyzing trace with hash 1538145987, now seen corresponding path program 23 times [2023-12-02 19:52:11,303 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:52:11,303 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [453425754] [2023-12-02 19:52:11,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:52:11,304 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:52:11,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:52:11,769 INFO L134 CoverageAnalysis]: Checked inductivity of 606 backedges. 67 proven. 77 refuted. 0 times theorem prover too weak. 462 trivial. 0 not checked. [2023-12-02 19:52:11,769 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:52:11,769 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [453425754] [2023-12-02 19:52:11,769 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [453425754] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:52:11,769 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1979866984] [2023-12-02 19:52:11,770 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 19:52:11,770 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:52:11,770 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:52:11,770 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:52:11,771 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2023-12-02 19:52:12,050 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2023-12-02 19:52:12,050 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 19:52:12,055 INFO L262 TraceCheckSpWp]: Trace formula consists of 597 conjuncts, 26 conjunts are in the unsatisfiable core [2023-12-02 19:52:12,057 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:52:12,430 INFO L134 CoverageAnalysis]: Checked inductivity of 606 backedges. 78 proven. 66 refuted. 0 times theorem prover too weak. 462 trivial. 0 not checked. [2023-12-02 19:52:12,430 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:52:12,737 INFO L134 CoverageAnalysis]: Checked inductivity of 606 backedges. 78 proven. 66 refuted. 0 times theorem prover too weak. 462 trivial. 0 not checked. [2023-12-02 19:52:12,738 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1979866984] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:52:12,738 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1482530642] [2023-12-02 19:52:12,739 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 19:52:12,739 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:52:12,739 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:52:12,739 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:52:12,739 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:52:12,916 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:52:13,102 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '28761#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 19:52:13,102 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:52:13,102 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 19:52:13,102 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 41 [2023-12-02 19:52:13,102 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [347862490] [2023-12-02 19:52:13,102 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 19:52:13,103 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2023-12-02 19:52:13,103 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:52:13,103 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2023-12-02 19:52:13,103 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=447, Invalid=1623, Unknown=0, NotChecked=0, Total=2070 [2023-12-02 19:52:13,103 INFO L87 Difference]: Start difference. First operand 114 states and 122 transitions. Second operand has 41 states, 41 states have (on average 1.7804878048780488) internal successors, (73), 41 states have internal predecessors, (73), 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 19:52:14,198 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:52:14,198 INFO L93 Difference]: Finished difference Result 307 states and 337 transitions. [2023-12-02 19:52:14,198 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2023-12-02 19:52:14,198 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.7804878048780488) internal successors, (73), 41 states have internal predecessors, (73), 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 113 [2023-12-02 19:52:14,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:52:14,199 INFO L225 Difference]: With dead ends: 307 [2023-12-02 19:52:14,199 INFO L226 Difference]: Without dead ends: 122 [2023-12-02 19:52:14,200 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 375 GetRequests, 297 SyntacticMatches, 23 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1429 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=711, Invalid=2481, Unknown=0, NotChecked=0, Total=3192 [2023-12-02 19:52:14,200 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 4 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 855 mSolverCounterSat, 576 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 1431 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 576 IncrementalHoareTripleChecker+Valid, 855 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-12-02 19:52:14,200 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 23 Invalid, 1431 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [576 Valid, 855 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-12-02 19:52:14,200 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2023-12-02 19:52:14,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 122. [2023-12-02 19:52:14,382 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 121 states have (on average 1.0743801652892562) internal successors, (130), 121 states have internal predecessors, (130), 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 19:52:14,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 130 transitions. [2023-12-02 19:52:14,382 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 130 transitions. Word has length 113 [2023-12-02 19:52:14,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:52:14,382 INFO L495 AbstractCegarLoop]: Abstraction has 122 states and 130 transitions. [2023-12-02 19:52:14,382 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 1.7804878048780488) internal successors, (73), 41 states have internal predecessors, (73), 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 19:52:14,383 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 130 transitions. [2023-12-02 19:52:14,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2023-12-02 19:52:14,383 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:52:14,383 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 12, 12, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:52:14,389 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2023-12-02 19:52:14,584 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2023-12-02 19:52:14,584 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:52:14,584 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:52:14,584 INFO L85 PathProgramCache]: Analyzing trace with hash -2034753677, now seen corresponding path program 24 times [2023-12-02 19:52:14,584 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:52:14,585 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [969875944] [2023-12-02 19:52:14,585 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:52:14,585 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:52:15,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:52:58,502 INFO L134 CoverageAnalysis]: Checked inductivity of 702 backedges. 81 proven. 621 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:52:58,503 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:52:58,503 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [969875944] [2023-12-02 19:52:58,503 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [969875944] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:52:58,503 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1336153103] [2023-12-02 19:52:58,503 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 19:52:58,503 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:52:58,503 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:52:58,504 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:52:58,505 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2023-12-02 19:52:58,743 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 19:52:58,743 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 19:52:58,753 WARN L260 TraceCheckSpWp]: Trace formula consists of 639 conjuncts, 398 conjunts are in the unsatisfiable core [2023-12-02 19:52:58,760 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:52:58,903 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-12-02 19:53:05,302 INFO L134 CoverageAnalysis]: Checked inductivity of 702 backedges. 12 proven. 624 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2023-12-02 19:53:05,302 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:53:12,809 INFO L134 CoverageAnalysis]: Checked inductivity of 702 backedges. 0 proven. 624 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2023-12-02 19:53:12,809 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1336153103] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:53:12,809 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1222031672] [2023-12-02 19:53:12,810 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 19:53:12,811 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:53:12,811 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:53:12,811 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:53:12,811 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:53:13,010 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:53:14,040 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '30512#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 19:53:14,040 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:53:14,040 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 19:53:14,041 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [106, 31, 29] total 159 [2023-12-02 19:53:14,041 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [99883349] [2023-12-02 19:53:14,041 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 19:53:14,041 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 159 states [2023-12-02 19:53:14,042 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:53:14,043 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 159 interpolants. [2023-12-02 19:53:14,044 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1037, Invalid=25695, Unknown=0, NotChecked=0, Total=26732 [2023-12-02 19:53:14,044 INFO L87 Difference]: Start difference. First operand 122 states and 130 transitions. Second operand has 159 states, 159 states have (on average 2.1132075471698113) internal successors, (336), 159 states have internal predecessors, (336), 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 19:53:46,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:53:46,403 INFO L93 Difference]: Finished difference Result 531 states and 577 transitions. [2023-12-02 19:53:46,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 118 states. [2023-12-02 19:53:46,404 INFO L78 Accepts]: Start accepts. Automaton has has 159 states, 159 states have (on average 2.1132075471698113) internal successors, (336), 159 states have internal predecessors, (336), 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 121 [2023-12-02 19:53:46,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:53:46,405 INFO L225 Difference]: With dead ends: 531 [2023-12-02 19:53:46,405 INFO L226 Difference]: Without dead ends: 329 [2023-12-02 19:53:46,408 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 566 GetRequests, 319 SyntacticMatches, 0 SemanticMatches, 247 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17179 ImplicationChecksByTransitivity, 44.4s TimeCoverageRelationStatistics Valid=3717, Invalid=58035, Unknown=0, NotChecked=0, Total=61752 [2023-12-02 19:53:46,408 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 103 mSDsluCounter, 233 mSDsCounter, 0 mSdLazyCounter, 11012 mSolverCounterSat, 1803 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 103 SdHoareTripleChecker+Valid, 238 SdHoareTripleChecker+Invalid, 12815 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1803 IncrementalHoareTripleChecker+Valid, 11012 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 11.7s IncrementalHoareTripleChecker+Time [2023-12-02 19:53:46,408 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [103 Valid, 238 Invalid, 12815 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1803 Valid, 11012 Invalid, 0 Unknown, 0 Unchecked, 11.7s Time] [2023-12-02 19:53:46,409 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 329 states. [2023-12-02 19:53:46,865 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 329 to 273. [2023-12-02 19:53:46,865 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 273 states, 272 states have (on average 1.088235294117647) internal successors, (296), 272 states have internal predecessors, (296), 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 19:53:46,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 273 states to 273 states and 296 transitions. [2023-12-02 19:53:46,866 INFO L78 Accepts]: Start accepts. Automaton has 273 states and 296 transitions. Word has length 121 [2023-12-02 19:53:46,866 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:53:46,866 INFO L495 AbstractCegarLoop]: Abstraction has 273 states and 296 transitions. [2023-12-02 19:53:46,866 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 159 states, 159 states have (on average 2.1132075471698113) internal successors, (336), 159 states have internal predecessors, (336), 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 19:53:46,866 INFO L276 IsEmpty]: Start isEmpty. Operand 273 states and 296 transitions. [2023-12-02 19:53:46,866 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2023-12-02 19:53:46,867 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:53:46,867 INFO L195 NwaCegarLoop]: trace histogram [13, 13, 12, 12, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:53:46,872 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Ended with exit code 0 [2023-12-02 19:53:47,067 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2023-12-02 19:53:47,068 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:53:47,068 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:53:47,068 INFO L85 PathProgramCache]: Analyzing trace with hash 1252498714, now seen corresponding path program 25 times [2023-12-02 19:53:47,068 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:53:47,068 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [184260879] [2023-12-02 19:53:47,068 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:53:47,069 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:53:47,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:53:47,660 INFO L134 CoverageAnalysis]: Checked inductivity of 728 backedges. 66 proven. 103 refuted. 0 times theorem prover too weak. 559 trivial. 0 not checked. [2023-12-02 19:53:47,660 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:53:47,660 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [184260879] [2023-12-02 19:53:47,660 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [184260879] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:53:47,660 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1616705163] [2023-12-02 19:53:47,660 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 19:53:47,661 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:53:47,661 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:53:47,662 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:53:47,662 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2023-12-02 19:53:47,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:53:47,829 INFO L262 TraceCheckSpWp]: Trace formula consists of 651 conjuncts, 28 conjunts are in the unsatisfiable core [2023-12-02 19:53:47,831 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:53:48,074 INFO L134 CoverageAnalysis]: Checked inductivity of 728 backedges. 78 proven. 91 refuted. 0 times theorem prover too weak. 559 trivial. 0 not checked. [2023-12-02 19:53:48,074 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:53:48,358 INFO L134 CoverageAnalysis]: Checked inductivity of 728 backedges. 78 proven. 91 refuted. 0 times theorem prover too weak. 559 trivial. 0 not checked. [2023-12-02 19:53:48,358 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1616705163] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:53:48,359 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1176050649] [2023-12-02 19:53:48,360 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 19:53:48,360 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:53:48,360 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:53:48,360 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:53:48,360 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:53:48,556 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:53:48,738 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '33052#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 19:53:48,738 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:53:48,738 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 19:53:48,738 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 44 [2023-12-02 19:53:48,739 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2064376217] [2023-12-02 19:53:48,739 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 19:53:48,739 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2023-12-02 19:53:48,739 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:53:48,739 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2023-12-02 19:53:48,739 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=465, Invalid=1791, Unknown=0, NotChecked=0, Total=2256 [2023-12-02 19:53:48,740 INFO L87 Difference]: Start difference. First operand 273 states and 296 transitions. Second operand has 44 states, 44 states have (on average 1.4318181818181819) internal successors, (63), 44 states have internal predecessors, (63), 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 19:53:49,835 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:53:49,835 INFO L93 Difference]: Finished difference Result 361 states and 396 transitions. [2023-12-02 19:53:49,835 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2023-12-02 19:53:49,835 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.4318181818181819) internal successors, (63), 44 states have internal predecessors, (63), 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 123 [2023-12-02 19:53:49,835 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:53:49,836 INFO L225 Difference]: With dead ends: 361 [2023-12-02 19:53:49,836 INFO L226 Difference]: Without dead ends: 131 [2023-12-02 19:53:49,837 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 411 GetRequests, 324 SyntacticMatches, 26 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1898 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=788, Invalid=3118, Unknown=0, NotChecked=0, Total=3906 [2023-12-02 19:53:49,837 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 28 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 1107 mSolverCounterSat, 603 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 1710 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 603 IncrementalHoareTripleChecker+Valid, 1107 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-12-02 19:53:49,837 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 23 Invalid, 1710 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [603 Valid, 1107 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-12-02 19:53:49,838 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2023-12-02 19:53:50,045 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 131. [2023-12-02 19:53:50,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 131 states, 130 states have (on average 1.0692307692307692) internal successors, (139), 130 states have internal predecessors, (139), 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 19:53:50,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 139 transitions. [2023-12-02 19:53:50,046 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 139 transitions. Word has length 123 [2023-12-02 19:53:50,046 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:53:50,046 INFO L495 AbstractCegarLoop]: Abstraction has 131 states and 139 transitions. [2023-12-02 19:53:50,046 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 1.4318181818181819) internal successors, (63), 44 states have internal predecessors, (63), 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 19:53:50,046 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 139 transitions. [2023-12-02 19:53:50,047 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2023-12-02 19:53:50,047 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:53:50,047 INFO L195 NwaCegarLoop]: trace histogram [13, 13, 13, 13, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:53:50,053 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Ended with exit code 0 [2023-12-02 19:53:50,247 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2023-12-02 19:53:50,248 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:53:50,248 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:53:50,248 INFO L85 PathProgramCache]: Analyzing trace with hash 1722717139, now seen corresponding path program 26 times [2023-12-02 19:53:50,248 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:53:50,248 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2044059317] [2023-12-02 19:53:50,248 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:53:50,249 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:53:50,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:54:40,888 INFO L134 CoverageAnalysis]: Checked inductivity of 819 backedges. 100 proven. 719 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:54:40,889 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:54:40,889 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2044059317] [2023-12-02 19:54:40,889 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2044059317] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:54:40,889 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [607443063] [2023-12-02 19:54:40,889 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 19:54:40,889 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:54:40,889 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:54:40,890 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:54:40,891 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2023-12-02 19:54:41,400 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2023-12-02 19:54:41,400 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 19:54:41,412 WARN L260 TraceCheckSpWp]: Trace formula consists of 686 conjuncts, 461 conjunts are in the unsatisfiable core [2023-12-02 19:54:41,419 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:54:41,716 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2023-12-02 19:54:41,827 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 26 [2023-12-02 19:54:41,958 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 19:54:41,959 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 36 treesize of output 38 [2023-12-02 19:55:05,715 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 19:55:05,716 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 19:55:05,722 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 19:55:05,724 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 19:55:05,724 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 19:55:05,725 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 19:55:05,726 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 19:55:05,728 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 19:55:05,731 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 19:55:05,732 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 19:55:05,733 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 19:55:05,733 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 19:55:05,735 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 19:55:05,737 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 19:55:05,737 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 19:55:05,845 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 19:55:05,846 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 12 select indices, 12 select index equivalence classes, 45 disjoint index pairs (out of 66 index pairs), introduced 12 new quantified variables, introduced 66 case distinctions, treesize of input 118 treesize of output 234 [2023-12-02 19:55:06,402 INFO L134 CoverageAnalysis]: Checked inductivity of 819 backedges. 31 proven. 743 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2023-12-02 19:55:06,403 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:55:33,663 INFO L134 CoverageAnalysis]: Checked inductivity of 819 backedges. 0 proven. 791 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2023-12-02 19:55:33,663 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [607443063] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:55:33,663 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1461833115] [2023-12-02 19:55:33,664 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 19:55:33,665 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:55:33,665 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:55:33,665 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:55:33,665 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:55:33,853 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:55:35,370 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '35103#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 19:55:35,370 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:55:35,370 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 19:55:35,370 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [114, 90, 73] total 272 [2023-12-02 19:55:35,370 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [598576986] [2023-12-02 19:55:35,371 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 19:55:35,371 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 272 states [2023-12-02 19:55:35,371 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:55:35,373 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 272 interpolants. [2023-12-02 19:55:35,375 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4661, Invalid=71791, Unknown=0, NotChecked=0, Total=76452 [2023-12-02 19:55:35,376 INFO L87 Difference]: Start difference. First operand 131 states and 139 transitions. Second operand has 272 states, 272 states have (on average 1.3639705882352942) internal successors, (371), 272 states have internal predecessors, (371), 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 19:55:45,876 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.83s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 19:56:32,853 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 19:56:48,746 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 19:56:58,122 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 19:57:03,208 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 19:57:08,967 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 19:57:16,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:57:16,525 INFO L93 Difference]: Finished difference Result 594 states and 640 transitions. [2023-12-02 19:57:16,525 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 179 states. [2023-12-02 19:57:16,526 INFO L78 Accepts]: Start accepts. Automaton has has 272 states, 272 states have (on average 1.3639705882352942) internal successors, (371), 272 states have internal predecessors, (371), 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 130 [2023-12-02 19:57:16,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:57:16,527 INFO L225 Difference]: With dead ends: 594 [2023-12-02 19:57:16,527 INFO L226 Difference]: Without dead ends: 377 [2023-12-02 19:57:16,533 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 661 GetRequests, 229 SyntacticMatches, 13 SemanticMatches, 419 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65518 ImplicationChecksByTransitivity, 125.2s TimeCoverageRelationStatistics Valid=13473, Invalid=163346, Unknown=1, NotChecked=0, Total=176820 [2023-12-02 19:57:16,534 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 156 mSDsluCounter, 343 mSDsCounter, 0 mSdLazyCounter, 20161 mSolverCounterSat, 3362 mSolverCounterUnsat, 5 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 33.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 156 SdHoareTripleChecker+Valid, 348 SdHoareTripleChecker+Invalid, 23528 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 3362 IncrementalHoareTripleChecker+Valid, 20161 IncrementalHoareTripleChecker+Invalid, 5 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 35.5s IncrementalHoareTripleChecker+Time [2023-12-02 19:57:16,534 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [156 Valid, 348 Invalid, 23528 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [3362 Valid, 20161 Invalid, 5 Unknown, 0 Unchecked, 35.5s Time] [2023-12-02 19:57:16,534 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 377 states. [2023-12-02 19:57:17,076 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 377 to 293. [2023-12-02 19:57:17,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 293 states, 292 states have (on average 1.082191780821918) internal successors, (316), 292 states have internal predecessors, (316), 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 19:57:17,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 293 states to 293 states and 316 transitions. [2023-12-02 19:57:17,077 INFO L78 Accepts]: Start accepts. Automaton has 293 states and 316 transitions. Word has length 130 [2023-12-02 19:57:17,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:57:17,078 INFO L495 AbstractCegarLoop]: Abstraction has 293 states and 316 transitions. [2023-12-02 19:57:17,078 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 272 states, 272 states have (on average 1.3639705882352942) internal successors, (371), 272 states have internal predecessors, (371), 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 19:57:17,078 INFO L276 IsEmpty]: Start isEmpty. Operand 293 states and 316 transitions. [2023-12-02 19:57:17,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2023-12-02 19:57:17,079 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:57:17,079 INFO L195 NwaCegarLoop]: trace histogram [14, 14, 13, 13, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:57:17,085 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Ended with exit code 0 [2023-12-02 19:57:17,279 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2023-12-02 19:57:17,280 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:57:17,280 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:57:17,280 INFO L85 PathProgramCache]: Analyzing trace with hash 830173882, now seen corresponding path program 27 times [2023-12-02 19:57:17,280 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:57:17,280 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [47940374] [2023-12-02 19:57:17,280 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:57:17,280 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:57:17,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:57:17,908 INFO L134 CoverageAnalysis]: Checked inductivity of 847 backedges. 78 proven. 118 refuted. 0 times theorem prover too weak. 651 trivial. 0 not checked. [2023-12-02 19:57:17,908 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:57:17,908 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [47940374] [2023-12-02 19:57:17,908 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [47940374] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:57:17,908 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1624662969] [2023-12-02 19:57:17,908 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 19:57:17,909 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:57:17,909 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:57:17,910 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:57:17,910 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2023-12-02 19:57:18,098 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 19:57:18,098 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 19:57:18,102 INFO L262 TraceCheckSpWp]: Trace formula consists of 657 conjuncts, 30 conjunts are in the unsatisfiable core [2023-12-02 19:57:18,104 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:57:18,787 INFO L134 CoverageAnalysis]: Checked inductivity of 847 backedges. 105 proven. 91 refuted. 0 times theorem prover too weak. 651 trivial. 0 not checked. [2023-12-02 19:57:18,787 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:57:19,468 INFO L134 CoverageAnalysis]: Checked inductivity of 847 backedges. 105 proven. 91 refuted. 0 times theorem prover too weak. 651 trivial. 0 not checked. [2023-12-02 19:57:19,468 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1624662969] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:57:19,468 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [376124908] [2023-12-02 19:57:19,469 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 19:57:19,470 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:57:19,470 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:57:19,470 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:57:19,470 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:57:19,632 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:57:19,860 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '38011#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 19:57:19,860 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:57:19,860 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 19:57:19,860 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 74 [2023-12-02 19:57:19,860 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1969642924] [2023-12-02 19:57:19,860 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 19:57:19,861 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 74 states [2023-12-02 19:57:19,861 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:57:19,862 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2023-12-02 19:57:19,862 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=898, Invalid=5264, Unknown=0, NotChecked=0, Total=6162 [2023-12-02 19:57:19,863 INFO L87 Difference]: Start difference. First operand 293 states and 316 transitions. Second operand has 74 states, 74 states have (on average 1.337837837837838) internal successors, (99), 74 states have internal predecessors, (99), 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 19:57:21,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:57:21,716 INFO L93 Difference]: Finished difference Result 387 states and 422 transitions. [2023-12-02 19:57:21,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2023-12-02 19:57:21,717 INFO L78 Accepts]: Start accepts. Automaton has has 74 states, 74 states have (on average 1.337837837837838) internal successors, (99), 74 states have internal predecessors, (99), 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 132 [2023-12-02 19:57:21,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:57:21,718 INFO L225 Difference]: With dead ends: 387 [2023-12-02 19:57:21,718 INFO L226 Difference]: Without dead ends: 140 [2023-12-02 19:57:21,719 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 455 GetRequests, 334 SyntacticMatches, 15 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4037 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1529, Invalid=10027, Unknown=0, NotChecked=0, Total=11556 [2023-12-02 19:57:21,719 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 142 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 1670 mSolverCounterSat, 827 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 142 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 2497 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 827 IncrementalHoareTripleChecker+Valid, 1670 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2023-12-02 19:57:21,719 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [142 Valid, 25 Invalid, 2497 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [827 Valid, 1670 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2023-12-02 19:57:21,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2023-12-02 19:57:21,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 140. [2023-12-02 19:57:21,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 140 states, 139 states have (on average 1.064748201438849) internal successors, (148), 139 states have internal predecessors, (148), 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 19:57:21,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 148 transitions. [2023-12-02 19:57:21,959 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 148 transitions. Word has length 132 [2023-12-02 19:57:21,959 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:57:21,960 INFO L495 AbstractCegarLoop]: Abstraction has 140 states and 148 transitions. [2023-12-02 19:57:21,960 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 74 states, 74 states have (on average 1.337837837837838) internal successors, (99), 74 states have internal predecessors, (99), 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 19:57:21,960 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 148 transitions. [2023-12-02 19:57:21,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2023-12-02 19:57:21,960 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:57:21,961 INFO L195 NwaCegarLoop]: trace histogram [14, 14, 14, 14, 14, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:57:21,967 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Ended with exit code 0 [2023-12-02 19:57:22,161 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2023-12-02 19:57:22,161 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:57:22,161 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:57:22,162 INFO L85 PathProgramCache]: Analyzing trace with hash -1837314445, now seen corresponding path program 28 times [2023-12-02 19:57:22,162 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:57:22,162 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [207183728] [2023-12-02 19:57:22,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:57:22,162 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:57:22,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:58:20,297 INFO L134 CoverageAnalysis]: Checked inductivity of 945 backedges. 100 proven. 845 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:58:20,298 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:58:20,298 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [207183728] [2023-12-02 19:58:20,298 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [207183728] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:58:20,298 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1819856907] [2023-12-02 19:58:20,298 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 19:58:20,298 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:58:20,298 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:58:20,299 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:58:20,299 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af8ba8a7-108d-4f28-8762-4e7a0ab66967/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2023-12-02 19:58:20,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:58:20,508 WARN L260 TraceCheckSpWp]: Trace formula consists of 733 conjuncts, 488 conjunts are in the unsatisfiable core [2023-12-02 19:58:20,515 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:58:21,868 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-12-02 19:58:27,580 INFO L134 CoverageAnalysis]: Checked inductivity of 945 backedges. 0 proven. 945 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:58:27,581 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:58:35,336 INFO L134 CoverageAnalysis]: Checked inductivity of 945 backedges. 0 proven. 840 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2023-12-02 19:58:35,336 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1819856907] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:58:35,336 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [822440018] [2023-12-02 19:58:35,337 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 19:58:35,337 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:58:35,337 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:58:35,337 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:58:35,337 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:58:35,509 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:58:36,464 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '40136#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 19:58:36,464 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:58:36,464 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 19:58:36,464 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [121, 48, 33] total 192 [2023-12-02 19:58:36,465 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1017645915] [2023-12-02 19:58:36,465 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 19:58:36,465 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 192 states [2023-12-02 19:58:36,465 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:58:36,466 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 192 interpolants. [2023-12-02 19:58:36,468 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1867, Invalid=36745, Unknown=0, NotChecked=0, Total=38612 [2023-12-02 19:58:36,468 INFO L87 Difference]: Start difference. First operand 140 states and 148 transitions. Second operand has 192 states, 192 states have (on average 2.0625) internal successors, (396), 192 states have internal predecessors, (396), 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)