./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-crafted/zero_sum_const_m4.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 30e01a73 Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_863e6236-35c8-442e-a572-621f8df66457/bin/utaipan-verify-mE87zJ7Ire/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_863e6236-35c8-442e-a572-621f8df66457/bin/utaipan-verify-mE87zJ7Ire/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_863e6236-35c8-442e-a572-621f8df66457/bin/utaipan-verify-mE87zJ7Ire/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_863e6236-35c8-442e-a572-621f8df66457/bin/utaipan-verify-mE87zJ7Ire/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-crafted/zero_sum_const_m4.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_863e6236-35c8-442e-a572-621f8df66457/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_863e6236-35c8-442e-a572-621f8df66457/bin/utaipan-verify-mE87zJ7Ire --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash aec2f9127d2f09ac657db5f4ff454a031f6027c12ee4edfdaac8d9dd392f7955 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-30e01a7 [2023-11-23 21:22:05,087 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-23 21:22:05,226 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_863e6236-35c8-442e-a572-621f8df66457/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-23 21:22:05,246 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-23 21:22:05,247 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-23 21:22:05,291 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-23 21:22:05,292 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-23 21:22:05,292 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-23 21:22:05,293 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-23 21:22:05,294 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-23 21:22:05,294 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-23 21:22:05,295 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-23 21:22:05,295 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-23 21:22:05,296 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-23 21:22:05,296 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-23 21:22:05,297 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-23 21:22:05,297 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-23 21:22:05,302 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-23 21:22:05,302 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-23 21:22:05,303 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-23 21:22:05,303 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-23 21:22:05,304 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-23 21:22:05,305 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-23 21:22:05,306 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-23 21:22:05,307 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-23 21:22:05,307 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-23 21:22:05,308 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-23 21:22:05,308 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-23 21:22:05,309 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-23 21:22:05,309 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-23 21:22:05,310 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-23 21:22:05,311 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-23 21:22:05,311 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-23 21:22:05,311 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-23 21:22:05,312 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-23 21:22:05,312 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-23 21:22:05,312 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-23 21:22:05,313 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:22:05,313 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-23 21:22:05,313 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-23 21:22:05,313 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-23 21:22:05,314 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-23 21:22:05,314 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-23 21:22:05,314 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-23 21:22:05,315 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-23 21:22:05,315 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-23 21:22:05,316 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-23 21:22:05,316 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_863e6236-35c8-442e-a572-621f8df66457/bin/utaipan-verify-mE87zJ7Ire/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_863e6236-35c8-442e-a572-621f8df66457/bin/utaipan-verify-mE87zJ7Ire Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> aec2f9127d2f09ac657db5f4ff454a031f6027c12ee4edfdaac8d9dd392f7955 [2023-11-23 21:22:05,619 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-23 21:22:05,651 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-23 21:22:05,655 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-23 21:22:05,657 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-23 21:22:05,658 INFO L274 PluginConnector]: CDTParser initialized [2023-11-23 21:22:05,659 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_863e6236-35c8-442e-a572-621f8df66457/bin/utaipan-verify-mE87zJ7Ire/../../sv-benchmarks/c/array-crafted/zero_sum_const_m4.c [2023-11-23 21:22:08,895 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-23 21:22:09,170 INFO L384 CDTParser]: Found 1 translation units. [2023-11-23 21:22:09,171 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_863e6236-35c8-442e-a572-621f8df66457/sv-benchmarks/c/array-crafted/zero_sum_const_m4.c [2023-11-23 21:22:09,179 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_863e6236-35c8-442e-a572-621f8df66457/bin/utaipan-verify-mE87zJ7Ire/data/29bf40d80/302c70c744f24529b656ff4cd7c0c82b/FLAG9196e47dc [2023-11-23 21:22:09,194 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_863e6236-35c8-442e-a572-621f8df66457/bin/utaipan-verify-mE87zJ7Ire/data/29bf40d80/302c70c744f24529b656ff4cd7c0c82b [2023-11-23 21:22:09,196 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-23 21:22:09,198 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-23 21:22:09,199 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-23 21:22:09,199 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-23 21:22:09,205 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-23 21:22:09,206 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:22:09" (1/1) ... [2023-11-23 21:22:09,207 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7934e37 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:22:09, skipping insertion in model container [2023-11-23 21:22:09,207 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:22:09" (1/1) ... [2023-11-23 21:22:09,231 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-23 21:22:09,400 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_863e6236-35c8-442e-a572-621f8df66457/sv-benchmarks/c/array-crafted/zero_sum_const_m4.c[408,421] [2023-11-23 21:22:09,423 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:22:09,433 INFO L202 MainTranslator]: Completed pre-run [2023-11-23 21:22:09,445 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_863e6236-35c8-442e-a572-621f8df66457/sv-benchmarks/c/array-crafted/zero_sum_const_m4.c[408,421] [2023-11-23 21:22:09,457 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:22:09,471 INFO L206 MainTranslator]: Completed translation [2023-11-23 21:22:09,472 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:22:09 WrapperNode [2023-11-23 21:22:09,472 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-23 21:22:09,473 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-23 21:22:09,473 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-23 21:22:09,473 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-23 21:22:09,480 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:22:09" (1/1) ... [2023-11-23 21:22:09,488 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:22:09" (1/1) ... [2023-11-23 21:22:09,512 INFO L138 Inliner]: procedures = 16, calls = 18, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 127 [2023-11-23 21:22:09,512 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-23 21:22:09,513 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-23 21:22:09,513 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-23 21:22:09,514 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-23 21:22:09,522 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:22:09" (1/1) ... [2023-11-23 21:22:09,522 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:22:09" (1/1) ... [2023-11-23 21:22:09,524 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:22:09" (1/1) ... [2023-11-23 21:22:09,525 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:22:09" (1/1) ... [2023-11-23 21:22:09,531 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:22:09" (1/1) ... [2023-11-23 21:22:09,536 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:22:09" (1/1) ... [2023-11-23 21:22:09,537 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:22:09" (1/1) ... [2023-11-23 21:22:09,539 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:22:09" (1/1) ... [2023-11-23 21:22:09,541 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-23 21:22:09,542 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-23 21:22:09,542 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-23 21:22:09,543 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-23 21:22:09,544 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:22:09" (1/1) ... [2023-11-23 21:22:09,550 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:22:09,567 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_863e6236-35c8-442e-a572-621f8df66457/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:22:09,581 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_863e6236-35c8-442e-a572-621f8df66457/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-23 21:22:09,584 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_863e6236-35c8-442e-a572-621f8df66457/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-23 21:22:09,612 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-23 21:22:09,613 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-23 21:22:09,613 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-23 21:22:09,613 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-11-23 21:22:09,613 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-23 21:22:09,613 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-23 21:22:09,613 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-23 21:22:09,683 INFO L241 CfgBuilder]: Building ICFG [2023-11-23 21:22:09,685 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-23 21:22:09,914 INFO L282 CfgBuilder]: Performing block encoding [2023-11-23 21:22:09,989 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-23 21:22:09,989 INFO L309 CfgBuilder]: Removed 9 assume(true) statements. [2023-11-23 21:22:09,991 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:22:09 BoogieIcfgContainer [2023-11-23 21:22:09,992 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-23 21:22:09,994 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-23 21:22:09,995 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-23 21:22:09,999 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-23 21:22:10,000 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 09:22:09" (1/3) ... [2023-11-23 21:22:10,001 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@707247c3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:22:10, skipping insertion in model container [2023-11-23 21:22:10,001 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:22:09" (2/3) ... [2023-11-23 21:22:10,001 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@707247c3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:22:10, skipping insertion in model container [2023-11-23 21:22:10,002 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:22:09" (3/3) ... [2023-11-23 21:22:10,003 INFO L112 eAbstractionObserver]: Analyzing ICFG zero_sum_const_m4.c [2023-11-23 21:22:10,022 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-23 21:22:10,022 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-23 21:22:10,074 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-23 21:22:10,081 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;@2a64b081, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-23 21:22:10,081 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-23 21:22:10,085 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) [2023-11-23 21:22:10,091 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-11-23 21:22:10,091 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:22:10,092 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:22:10,092 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:22:10,098 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:22:10,098 INFO L85 PathProgramCache]: Analyzing trace with hash -1435089549, now seen corresponding path program 1 times [2023-11-23 21:22:10,106 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:22:10,107 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1156792837] [2023-11-23 21:22:10,107 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:22:10,107 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:22:10,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:22:10,387 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:22:10,387 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:22:10,388 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1156792837] [2023-11-23 21:22:10,389 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1156792837] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:22:10,389 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:22:10,389 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-23 21:22:10,391 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [7068308] [2023-11-23 21:22:10,392 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:22:10,396 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:22:10,397 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:22:10,438 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:22:10,439 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:22:10,441 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) [2023-11-23 21:22:10,541 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:22:10,541 INFO L93 Difference]: Finished difference Result 32 states and 51 transitions. [2023-11-23 21:22:10,543 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:22:10,544 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 [2023-11-23 21:22:10,545 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:22:10,553 INFO L225 Difference]: With dead ends: 32 [2023-11-23 21:22:10,553 INFO L226 Difference]: Without dead ends: 15 [2023-11-23 21:22:10,575 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:22:10,583 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 0 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s 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 [2023-11-23 21:22:10,585 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] [2023-11-23 21:22:10,604 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2023-11-23 21:22:10,618 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2023-11-23 21:22:10,620 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) [2023-11-23 21:22:10,622 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 23 transitions. [2023-11-23 21:22:10,624 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 23 transitions. Word has length 13 [2023-11-23 21:22:10,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:22:10,625 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 23 transitions. [2023-11-23 21:22:10,626 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) [2023-11-23 21:22:10,626 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 23 transitions. [2023-11-23 21:22:10,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-11-23 21:22:10,627 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:22:10,627 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:22:10,627 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-23 21:22:10,629 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:22:10,630 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:22:10,630 INFO L85 PathProgramCache]: Analyzing trace with hash -1433785562, now seen corresponding path program 1 times [2023-11-23 21:22:10,631 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:22:10,631 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1462881626] [2023-11-23 21:22:10,631 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:22:10,631 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:22:10,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:22:10,797 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-23 21:22:10,798 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:22:10,798 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1462881626] [2023-11-23 21:22:10,798 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1462881626] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:22:10,799 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:22:10,799 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-23 21:22:10,799 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [48642614] [2023-11-23 21:22:10,799 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:22:10,801 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-23 21:22:10,801 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:22:10,802 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-23 21:22:10,802 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-23 21:22:10,802 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) [2023-11-23 21:22:10,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:22:10,874 INFO L93 Difference]: Finished difference Result 33 states and 55 transitions. [2023-11-23 21:22:10,875 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-23 21:22:10,875 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 [2023-11-23 21:22:10,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:22:10,876 INFO L225 Difference]: With dead ends: 33 [2023-11-23 21:22:10,876 INFO L226 Difference]: Without dead ends: 23 [2023-11-23 21:22:10,877 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 [2023-11-23 21:22:10,879 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 [2023-11-23 21:22:10,879 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] [2023-11-23 21:22:10,881 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2023-11-23 21:22:10,886 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2023-11-23 21:22:10,887 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) [2023-11-23 21:22:10,887 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 31 transitions. [2023-11-23 21:22:10,888 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 31 transitions. Word has length 14 [2023-11-23 21:22:10,888 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:22:10,888 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 31 transitions. [2023-11-23 21:22:10,888 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) [2023-11-23 21:22:10,888 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 31 transitions. [2023-11-23 21:22:10,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2023-11-23 21:22:10,889 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:22:10,889 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] [2023-11-23 21:22:10,890 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-23 21:22:10,890 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:22:10,890 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:22:10,891 INFO L85 PathProgramCache]: Analyzing trace with hash -135726125, now seen corresponding path program 1 times [2023-11-23 21:22:10,891 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:22:10,892 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [408730434] [2023-11-23 21:22:10,892 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:22:10,892 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:22:10,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:22:11,051 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-11-23 21:22:11,051 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:22:11,052 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [408730434] [2023-11-23 21:22:11,052 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [408730434] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:22:11,052 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [95186084] [2023-11-23 21:22:11,052 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:22:11,053 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:22:11,053 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_863e6236-35c8-442e-a572-621f8df66457/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:22:11,055 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_863e6236-35c8-442e-a572-621f8df66457/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:22:11,087 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_863e6236-35c8-442e-a572-621f8df66457/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-23 21:22:11,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:22:11,167 INFO L262 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 4 conjunts are in the unsatisfiable core [2023-11-23 21:22:11,173 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:22:11,232 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-11-23 21:22:11,233 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:22:11,260 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-11-23 21:22:11,261 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [95186084] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:22:11,261 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [860177478] [2023-11-23 21:22:11,282 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-11-23 21:22:11,283 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:22:11,286 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:22:11,292 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:22:11,292 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:22:12,056 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:22:12,202 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '334#(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 [2023-11-23 21:22:12,202 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:22:12,203 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:22:12,203 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2023-11-23 21:22:12,203 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [707062118] [2023-11-23 21:22:12,203 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:22:12,204 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-23 21:22:12,204 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:22:12,205 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-23 21:22:12,205 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2023-11-23 21:22:12,206 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) [2023-11-23 21:22:12,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:22:12,315 INFO L93 Difference]: Finished difference Result 43 states and 59 transitions. [2023-11-23 21:22:12,315 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-23 21:22:12,315 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 [2023-11-23 21:22:12,316 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:22:12,316 INFO L225 Difference]: With dead ends: 43 [2023-11-23 21:22:12,316 INFO L226 Difference]: Without dead ends: 24 [2023-11-23 21:22:12,317 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 57 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2023-11-23 21:22:12,319 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 [2023-11-23 21:22:12,319 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] [2023-11-23 21:22:12,320 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2023-11-23 21:22:12,325 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2023-11-23 21:22:12,325 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) [2023-11-23 21:22:12,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 32 transitions. [2023-11-23 21:22:12,327 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 32 transitions. Word has length 22 [2023-11-23 21:22:12,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:22:12,327 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 32 transitions. [2023-11-23 21:22:12,327 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) [2023-11-23 21:22:12,327 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 32 transitions. [2023-11-23 21:22:12,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2023-11-23 21:22:12,328 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:22:12,329 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] [2023-11-23 21:22:12,355 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_863e6236-35c8-442e-a572-621f8df66457/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-23 21:22:12,546 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_863e6236-35c8-442e-a572-621f8df66457/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:22:12,546 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:22:12,547 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:22:12,547 INFO L85 PathProgramCache]: Analyzing trace with hash -557789312, now seen corresponding path program 2 times [2023-11-23 21:22:12,547 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:22:12,547 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1961517405] [2023-11-23 21:22:12,547 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:22:12,548 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:22:12,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:22:12,722 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-23 21:22:12,723 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:22:12,726 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1961517405] [2023-11-23 21:22:12,726 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1961517405] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:22:12,727 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1175180013] [2023-11-23 21:22:12,727 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-23 21:22:12,730 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:22:12,730 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_863e6236-35c8-442e-a572-621f8df66457/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:22:12,731 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_863e6236-35c8-442e-a572-621f8df66457/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:22:12,759 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_863e6236-35c8-442e-a572-621f8df66457/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-23 21:22:12,812 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-11-23 21:22:12,812 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 21:22:12,814 INFO L262 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 4 conjunts are in the unsatisfiable core [2023-11-23 21:22:12,816 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:22:12,869 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-23 21:22:12,869 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:22:12,929 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-23 21:22:12,931 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1175180013] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:22:12,931 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [311220909] [2023-11-23 21:22:12,935 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-11-23 21:22:12,935 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:22:12,936 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:22:12,936 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:22:12,936 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:22:13,499 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:22:13,646 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 [2023-11-23 21:22:13,646 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:22:13,646 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:22:13,647 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2023-11-23 21:22:13,647 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1073395040] [2023-11-23 21:22:13,648 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:22:13,649 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-23 21:22:13,649 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:22:13,651 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-23 21:22:13,652 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=115, Unknown=0, NotChecked=0, Total=156 [2023-11-23 21:22:13,655 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) [2023-11-23 21:22:13,757 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:22:13,757 INFO L93 Difference]: Finished difference Result 49 states and 71 transitions. [2023-11-23 21:22:13,758 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-23 21:22:13,758 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 [2023-11-23 21:22:13,758 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:22:13,759 INFO L225 Difference]: With dead ends: 49 [2023-11-23 21:22:13,760 INFO L226 Difference]: Without dead ends: 32 [2023-11-23 21:22:13,761 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 [2023-11-23 21:22:13,766 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 [2023-11-23 21:22:13,770 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] [2023-11-23 21:22:13,773 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2023-11-23 21:22:13,784 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2023-11-23 21:22:13,785 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) [2023-11-23 21:22:13,785 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 40 transitions. [2023-11-23 21:22:13,786 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 40 transitions. Word has length 23 [2023-11-23 21:22:13,786 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:22:13,786 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 40 transitions. [2023-11-23 21:22:13,786 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) [2023-11-23 21:22:13,787 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 40 transitions. [2023-11-23 21:22:13,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2023-11-23 21:22:13,788 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:22:13,788 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] [2023-11-23 21:22:13,812 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_863e6236-35c8-442e-a572-621f8df66457/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-23 21:22:14,009 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_863e6236-35c8-442e-a572-621f8df66457/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:22:14,010 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:22:14,010 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:22:14,010 INFO L85 PathProgramCache]: Analyzing trace with hash -315919245, now seen corresponding path program 3 times [2023-11-23 21:22:14,011 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:22:14,011 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1276404114] [2023-11-23 21:22:14,011 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:22:14,011 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:22:14,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:22:17,525 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:22:17,525 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:22:17,525 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1276404114] [2023-11-23 21:22:17,526 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1276404114] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:22:17,526 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [472985794] [2023-11-23 21:22:17,526 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-23 21:22:17,526 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:22:17,527 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_863e6236-35c8-442e-a572-621f8df66457/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:22:17,528 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_863e6236-35c8-442e-a572-621f8df66457/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:22:17,559 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_863e6236-35c8-442e-a572-621f8df66457/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-23 21:22:17,634 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-23 21:22:17,634 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 21:22:17,637 INFO L262 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 71 conjunts are in the unsatisfiable core [2023-11-23 21:22:17,643 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:22:18,803 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-23 21:22:18,803 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:22:20,439 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-23 21:22:20,440 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 43 [2023-11-23 21:22:20,565 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-23 21:22:20,570 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [472985794] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:22:20,571 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [335143191] [2023-11-23 21:22:20,577 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-11-23 21:22:20,579 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:22:20,579 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:22:20,580 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:22:20,580 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:22:20,986 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:22:21,529 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '996#(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 [2023-11-23 21:22:21,530 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:22:21,530 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:22:21,530 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 22, 24] total 62 [2023-11-23 21:22:21,530 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [287883646] [2023-11-23 21:22:21,531 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:22:21,531 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 62 states [2023-11-23 21:22:21,532 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:22:21,533 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2023-11-23 21:22:21,535 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=238, Invalid=4184, Unknown=0, NotChecked=0, Total=4422 [2023-11-23 21:22:21,536 INFO L87 Difference]: Start difference. First operand 32 states and 40 transitions. Second operand has 62 states, 62 states have (on average 1.3709677419354838) internal successors, (85), 62 states have internal predecessors, (85), 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) [2023-11-23 21:22:22,891 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:22:22,892 INFO L93 Difference]: Finished difference Result 57 states and 72 transitions. [2023-11-23 21:22:22,892 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2023-11-23 21:22:22,893 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 62 states have (on average 1.3709677419354838) internal successors, (85), 62 states have internal predecessors, (85), 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 [2023-11-23 21:22:22,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:22:22,895 INFO L225 Difference]: With dead ends: 57 [2023-11-23 21:22:22,895 INFO L226 Difference]: Without dead ends: 54 [2023-11-23 21:22:22,898 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 55 SyntacticMatches, 1 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1292 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=293, Invalid=5407, Unknown=0, NotChecked=0, Total=5700 [2023-11-23 21:22:22,899 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 3 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 1241 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 1244 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 1241 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2023-11-23 21:22:22,899 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 67 Invalid, 1244 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 1241 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2023-11-23 21:22:22,900 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2023-11-23 21:22:22,912 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 52. [2023-11-23 21:22:22,913 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) [2023-11-23 21:22:22,914 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 67 transitions. [2023-11-23 21:22:22,914 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 67 transitions. Word has length 31 [2023-11-23 21:22:22,914 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:22:22,915 INFO L495 AbstractCegarLoop]: Abstraction has 52 states and 67 transitions. [2023-11-23 21:22:22,915 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 62 states, 62 states have (on average 1.3709677419354838) internal successors, (85), 62 states have internal predecessors, (85), 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) [2023-11-23 21:22:22,915 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 67 transitions. [2023-11-23 21:22:22,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2023-11-23 21:22:22,916 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:22:22,917 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] [2023-11-23 21:22:22,936 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_863e6236-35c8-442e-a572-621f8df66457/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-11-23 21:22:23,131 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_863e6236-35c8-442e-a572-621f8df66457/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:22:23,131 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:22:23,132 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:22:23,132 INFO L85 PathProgramCache]: Analyzing trace with hash 335112836, now seen corresponding path program 4 times [2023-11-23 21:22:23,132 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:22:23,132 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1040870516] [2023-11-23 21:22:23,132 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:22:23,132 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:22:23,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:22:23,285 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-11-23 21:22:23,285 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:22:23,286 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1040870516] [2023-11-23 21:22:23,286 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1040870516] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:22:23,286 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [764914566] [2023-11-23 21:22:23,286 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-23 21:22:23,286 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:22:23,287 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_863e6236-35c8-442e-a572-621f8df66457/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:22:23,291 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_863e6236-35c8-442e-a572-621f8df66457/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:22:23,295 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_863e6236-35c8-442e-a572-621f8df66457/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-23 21:22:23,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:22:23,373 INFO L262 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 8 conjunts are in the unsatisfiable core [2023-11-23 21:22:23,376 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:22:23,436 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-11-23 21:22:23,436 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:22:23,484 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-11-23 21:22:23,485 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [764914566] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:22:23,485 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [195481164] [2023-11-23 21:22:23,488 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-11-23 21:22:23,488 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:22:23,488 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:22:23,489 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:22:23,489 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:22:23,846 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:22:24,022 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1424#(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 [2023-11-23 21:22:24,022 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:22:24,023 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:22:24,023 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2023-11-23 21:22:24,023 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1026732029] [2023-11-23 21:22:24,023 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:22:24,024 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-11-23 21:22:24,024 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:22:24,024 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-11-23 21:22:24,025 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=264, Unknown=0, NotChecked=0, Total=342 [2023-11-23 21:22:24,025 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) [2023-11-23 21:22:24,293 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:22:24,294 INFO L93 Difference]: Finished difference Result 114 states and 149 transitions. [2023-11-23 21:22:24,294 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-23 21:22:24,295 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 [2023-11-23 21:22:24,295 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:22:24,296 INFO L225 Difference]: With dead ends: 114 [2023-11-23 21:22:24,296 INFO L226 Difference]: Without dead ends: 65 [2023-11-23 21:22:24,297 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 81 SyntacticMatches, 5 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 158 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=107, Invalid=355, Unknown=0, NotChecked=0, Total=462 [2023-11-23 21:22:24,297 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 40 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 174 mSolverCounterSat, 147 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 321 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 147 IncrementalHoareTripleChecker+Valid, 174 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-23 21:22:24,298 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [40 Valid, 17 Invalid, 321 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [147 Valid, 174 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-23 21:22:24,298 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2023-11-23 21:22:24,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 58. [2023-11-23 21:22:24,309 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) [2023-11-23 21:22:24,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 72 transitions. [2023-11-23 21:22:24,310 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 72 transitions. Word has length 32 [2023-11-23 21:22:24,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:22:24,310 INFO L495 AbstractCegarLoop]: Abstraction has 58 states and 72 transitions. [2023-11-23 21:22:24,312 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) [2023-11-23 21:22:24,312 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 72 transitions. [2023-11-23 21:22:24,314 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2023-11-23 21:22:24,314 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:22:24,315 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] [2023-11-23 21:22:24,339 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_863e6236-35c8-442e-a572-621f8df66457/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-23 21:22:24,531 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_863e6236-35c8-442e-a572-621f8df66457/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:22:24,531 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:22:24,532 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:22:24,532 INFO L85 PathProgramCache]: Analyzing trace with hash -269107872, now seen corresponding path program 5 times [2023-11-23 21:22:24,532 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:22:24,532 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [256442354] [2023-11-23 21:22:24,532 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:22:24,532 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:22:24,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:22:24,677 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-11-23 21:22:24,677 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:22:24,677 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [256442354] [2023-11-23 21:22:24,677 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [256442354] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:22:24,678 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1508656761] [2023-11-23 21:22:24,678 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-23 21:22:24,678 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:22:24,678 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_863e6236-35c8-442e-a572-621f8df66457/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:22:24,679 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_863e6236-35c8-442e-a572-621f8df66457/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:22:24,707 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_863e6236-35c8-442e-a572-621f8df66457/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-23 21:22:24,776 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-11-23 21:22:24,777 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 21:22:24,778 INFO L262 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 8 conjunts are in the unsatisfiable core [2023-11-23 21:22:24,780 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:22:24,847 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-11-23 21:22:24,848 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:22:24,925 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-11-23 21:22:24,925 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1508656761] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:22:24,925 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [583317696] [2023-11-23 21:22:24,928 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-11-23 21:22:24,928 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:22:24,929 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:22:24,929 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:22:24,930 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:22:25,269 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:22:25,411 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1966#(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 [2023-11-23 21:22:25,411 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:22:25,411 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:22:25,412 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2023-11-23 21:22:25,412 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [317840353] [2023-11-23 21:22:25,412 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:22:25,412 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-11-23 21:22:25,413 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:22:25,413 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-11-23 21:22:25,413 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=241, Unknown=0, NotChecked=0, Total=306 [2023-11-23 21:22:25,414 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) [2023-11-23 21:22:25,696 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:22:25,696 INFO L93 Difference]: Finished difference Result 62 states and 76 transitions. [2023-11-23 21:22:25,696 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-23 21:22:25,697 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 [2023-11-23 21:22:25,697 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:22:25,697 INFO L225 Difference]: With dead ends: 62 [2023-11-23 21:22:25,697 INFO L226 Difference]: Without dead ends: 41 [2023-11-23 21:22:25,698 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 [2023-11-23 21:22:25,699 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 23 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 197 mSolverCounterSat, 99 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 296 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 99 IncrementalHoareTripleChecker+Valid, 197 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-23 21:22:25,699 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 13 Invalid, 296 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [99 Valid, 197 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-23 21:22:25,699 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2023-11-23 21:22:25,705 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2023-11-23 21:22:25,705 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) [2023-11-23 21:22:25,706 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 49 transitions. [2023-11-23 21:22:25,706 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 49 transitions. Word has length 33 [2023-11-23 21:22:25,706 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:22:25,706 INFO L495 AbstractCegarLoop]: Abstraction has 41 states and 49 transitions. [2023-11-23 21:22:25,706 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) [2023-11-23 21:22:25,707 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 49 transitions. [2023-11-23 21:22:25,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2023-11-23 21:22:25,714 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:22:25,715 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] [2023-11-23 21:22:25,744 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_863e6236-35c8-442e-a572-621f8df66457/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-23 21:22:25,931 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_863e6236-35c8-442e-a572-621f8df66457/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:22:25,931 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:22:25,932 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:22:25,932 INFO L85 PathProgramCache]: Analyzing trace with hash 1553637331, now seen corresponding path program 6 times [2023-11-23 21:22:25,932 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:22:25,932 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1174972147] [2023-11-23 21:22:25,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:22:25,932 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:22:26,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:22:32,467 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 54 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:22:32,467 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:22:32,467 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1174972147] [2023-11-23 21:22:32,467 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1174972147] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:22:32,467 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [937456167] [2023-11-23 21:22:32,468 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-23 21:22:32,468 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:22:32,468 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_863e6236-35c8-442e-a572-621f8df66457/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:22:32,469 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_863e6236-35c8-442e-a572-621f8df66457/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:22:32,498 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_863e6236-35c8-442e-a572-621f8df66457/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-23 21:22:32,574 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-23 21:22:32,574 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 21:22:32,578 INFO L262 TraceCheckSpWp]: Trace formula consists of 216 conjuncts, 103 conjunts are in the unsatisfiable core [2023-11-23 21:22:32,582 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:22:35,123 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 48 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-23 21:22:35,124 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:22:38,467 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-23 21:22:38,468 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 [2023-11-23 21:22:38,790 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 48 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-23 21:22:38,791 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [937456167] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:22:38,791 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [35381802] [2023-11-23 21:22:38,793 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-11-23 21:22:38,794 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:22:38,794 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:22:38,794 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:22:38,794 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:22:39,096 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:22:39,722 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2500#(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 [2023-11-23 21:22:39,722 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:22:39,722 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:22:39,722 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 30, 32] total 93 [2023-11-23 21:22:39,723 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1292757207] [2023-11-23 21:22:39,723 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:22:39,724 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 93 states [2023-11-23 21:22:39,724 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:22:39,725 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 93 interpolants. [2023-11-23 21:22:39,729 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=305, Invalid=9201, Unknown=0, NotChecked=0, Total=9506 [2023-11-23 21:22:39,729 INFO L87 Difference]: Start difference. First operand 41 states and 49 transitions. Second operand has 93 states, 93 states have (on average 1.1827956989247312) internal successors, (110), 93 states have internal predecessors, (110), 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) [2023-11-23 21:22:52,880 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:22:52,880 INFO L93 Difference]: Finished difference Result 127 states and 162 transitions. [2023-11-23 21:22:52,880 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2023-11-23 21:22:52,881 INFO L78 Accepts]: Start accepts. Automaton has has 93 states, 93 states have (on average 1.1827956989247312) internal successors, (110), 93 states have internal predecessors, (110), 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 [2023-11-23 21:22:52,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:22:52,883 INFO L225 Difference]: With dead ends: 127 [2023-11-23 21:22:52,883 INFO L226 Difference]: Without dead ends: 123 [2023-11-23 21:22:52,892 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 217 GetRequests, 60 SyntacticMatches, 1 SemanticMatches, 156 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4897 ImplicationChecksByTransitivity, 16.6s TimeCoverageRelationStatistics Valid=1312, Invalid=23494, Unknown=0, NotChecked=0, Total=24806 [2023-11-23 21:22:52,892 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 200 mSDsluCounter, 110 mSDsCounter, 0 mSdLazyCounter, 5316 mSolverCounterSat, 950 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 200 SdHoareTripleChecker+Valid, 113 SdHoareTripleChecker+Invalid, 6266 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 950 IncrementalHoareTripleChecker+Valid, 5316 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.2s IncrementalHoareTripleChecker+Time [2023-11-23 21:22:52,893 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [200 Valid, 113 Invalid, 6266 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [950 Valid, 5316 Invalid, 0 Unknown, 0 Unchecked, 4.2s Time] [2023-11-23 21:22:52,893 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2023-11-23 21:22:52,916 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 55. [2023-11-23 21:22:52,916 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 54 states have (on average 1.2407407407407407) internal successors, (67), 54 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) [2023-11-23 21:22:52,917 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 67 transitions. [2023-11-23 21:22:52,917 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 67 transitions. Word has length 40 [2023-11-23 21:22:52,918 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:22:52,918 INFO L495 AbstractCegarLoop]: Abstraction has 55 states and 67 transitions. [2023-11-23 21:22:52,918 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 93 states, 93 states have (on average 1.1827956989247312) internal successors, (110), 93 states have internal predecessors, (110), 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) [2023-11-23 21:22:52,918 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 67 transitions. [2023-11-23 21:22:52,919 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2023-11-23 21:22:52,919 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:22:52,919 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] [2023-11-23 21:22:52,939 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_863e6236-35c8-442e-a572-621f8df66457/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-23 21:22:53,127 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_863e6236-35c8-442e-a572-621f8df66457/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:22:53,127 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:22:53,128 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:22:53,128 INFO L85 PathProgramCache]: Analyzing trace with hash -359452990, now seen corresponding path program 7 times [2023-11-23 21:22:53,128 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:22:53,128 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1069179667] [2023-11-23 21:22:53,128 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:22:53,128 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:22:53,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:22:53,289 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 7 proven. 9 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2023-11-23 21:22:53,290 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:22:53,290 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1069179667] [2023-11-23 21:22:53,290 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1069179667] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:22:53,290 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1624570563] [2023-11-23 21:22:53,290 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-23 21:22:53,290 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:22:53,291 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_863e6236-35c8-442e-a572-621f8df66457/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:22:53,292 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_863e6236-35c8-442e-a572-621f8df66457/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:22:53,300 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_863e6236-35c8-442e-a572-621f8df66457/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-23 21:22:53,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:22:53,385 INFO L262 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 10 conjunts are in the unsatisfiable core [2023-11-23 21:22:53,388 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:22:53,471 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2023-11-23 21:22:53,472 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:22:53,541 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2023-11-23 21:22:53,541 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1624570563] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:22:53,541 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1128687988] [2023-11-23 21:22:53,546 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-11-23 21:22:53,547 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:22:53,547 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:22:53,547 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:22:53,547 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:22:53,822 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:22:53,965 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3229#(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 [2023-11-23 21:22:53,965 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:22:53,965 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:22:53,966 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 17 [2023-11-23 21:22:53,966 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2056886223] [2023-11-23 21:22:53,966 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:22:53,966 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-11-23 21:22:53,966 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:22:53,967 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-11-23 21:22:53,967 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=359, Unknown=0, NotChecked=0, Total=462 [2023-11-23 21:22:53,967 INFO L87 Difference]: Start difference. First operand 55 states and 67 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) [2023-11-23 21:22:54,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:22:54,270 INFO L93 Difference]: Finished difference Result 146 states and 182 transitions. [2023-11-23 21:22:54,270 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-11-23 21:22:54,270 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 [2023-11-23 21:22:54,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:22:54,271 INFO L225 Difference]: With dead ends: 146 [2023-11-23 21:22:54,271 INFO L226 Difference]: Without dead ends: 68 [2023-11-23 21:22:54,272 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 105 SyntacticMatches, 7 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 242 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=148, Invalid=502, Unknown=0, NotChecked=0, Total=650 [2023-11-23 21:22:54,274 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 28 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 214 mSolverCounterSat, 234 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 448 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 234 IncrementalHoareTripleChecker+Valid, 214 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-23 21:22:54,274 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 15 Invalid, 448 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [234 Valid, 214 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-23 21:22:54,276 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2023-11-23 21:22:54,298 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 61. [2023-11-23 21:22:54,299 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 60 states have (on average 1.2) internal successors, (72), 60 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) [2023-11-23 21:22:54,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 72 transitions. [2023-11-23 21:22:54,299 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 72 transitions. Word has length 41 [2023-11-23 21:22:54,299 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:22:54,300 INFO L495 AbstractCegarLoop]: Abstraction has 61 states and 72 transitions. [2023-11-23 21:22:54,300 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) [2023-11-23 21:22:54,300 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 72 transitions. [2023-11-23 21:22:54,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2023-11-23 21:22:54,301 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:22:54,301 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:22:54,319 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_863e6236-35c8-442e-a572-621f8df66457/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-23 21:22:54,507 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_863e6236-35c8-442e-a572-621f8df66457/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:22:54,507 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:22:54,508 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:22:54,508 INFO L85 PathProgramCache]: Analyzing trace with hash 139595584, now seen corresponding path program 8 times [2023-11-23 21:22:54,508 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:22:54,508 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1771915395] [2023-11-23 21:22:54,508 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:22:54,508 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:22:54,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:22:54,669 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2023-11-23 21:22:54,669 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:22:54,670 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1771915395] [2023-11-23 21:22:54,670 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1771915395] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:22:54,670 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [981667049] [2023-11-23 21:22:54,670 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-23 21:22:54,670 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:22:54,670 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_863e6236-35c8-442e-a572-621f8df66457/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:22:54,671 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_863e6236-35c8-442e-a572-621f8df66457/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:22:54,699 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_863e6236-35c8-442e-a572-621f8df66457/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-23 21:22:54,812 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-11-23 21:22:54,812 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 21:22:54,814 INFO L262 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 10 conjunts are in the unsatisfiable core [2023-11-23 21:22:54,816 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:22:54,919 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2023-11-23 21:22:54,920 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:22:55,027 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2023-11-23 21:22:55,027 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [981667049] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:22:55,027 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [205442983] [2023-11-23 21:22:55,030 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-11-23 21:22:55,030 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:22:55,030 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:22:55,030 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:22:55,031 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:22:55,305 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:22:55,454 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3918#(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 [2023-11-23 21:22:55,454 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:22:55,454 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:22:55,455 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 17 [2023-11-23 21:22:55,455 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2049212110] [2023-11-23 21:22:55,455 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:22:55,455 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-11-23 21:22:55,455 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:22:55,456 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-11-23 21:22:55,456 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=333, Unknown=0, NotChecked=0, Total=420 [2023-11-23 21:22:55,457 INFO L87 Difference]: Start difference. First operand 61 states and 72 transitions. Second operand has 17 states, 17 states have (on average 2.411764705882353) internal successors, (41), 17 states have internal predecessors, (41), 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) [2023-11-23 21:22:55,754 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:22:55,755 INFO L93 Difference]: Finished difference Result 65 states and 76 transitions. [2023-11-23 21:22:55,755 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-11-23 21:22:55,755 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.411764705882353) internal successors, (41), 17 states have internal predecessors, (41), 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 45 [2023-11-23 21:22:55,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:22:55,756 INFO L225 Difference]: With dead ends: 65 [2023-11-23 21:22:55,756 INFO L226 Difference]: Without dead ends: 50 [2023-11-23 21:22:55,757 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 117 SyntacticMatches, 8 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 251 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=140, Invalid=562, Unknown=0, NotChecked=0, Total=702 [2023-11-23 21:22:55,757 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 18 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 230 mSolverCounterSat, 201 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 431 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 201 IncrementalHoareTripleChecker+Valid, 230 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-23 21:22:55,758 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 13 Invalid, 431 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [201 Valid, 230 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-23 21:22:55,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2023-11-23 21:22:55,782 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2023-11-23 21:22:55,782 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) [2023-11-23 21:22:55,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 58 transitions. [2023-11-23 21:22:55,783 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 58 transitions. Word has length 45 [2023-11-23 21:22:55,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:22:55,783 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 58 transitions. [2023-11-23 21:22:55,783 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.411764705882353) internal successors, (41), 17 states have internal predecessors, (41), 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) [2023-11-23 21:22:55,783 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 58 transitions. [2023-11-23 21:22:55,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2023-11-23 21:22:55,784 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:22:55,784 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] [2023-11-23 21:22:55,799 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_863e6236-35c8-442e-a572-621f8df66457/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-11-23 21:22:55,991 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_863e6236-35c8-442e-a572-621f8df66457/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-11-23 21:22:55,991 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:22:55,992 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:22:55,992 INFO L85 PathProgramCache]: Analyzing trace with hash -1663966349, now seen corresponding path program 9 times [2023-11-23 21:22:55,992 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:22:55,993 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1827473160] [2023-11-23 21:22:55,993 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:22:55,993 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:22:56,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat