./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-lopstr16/flag_loopdep_simple.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 0e0057cc Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0855f6b4-3b76-43d0-8de8-2e219f02028a/bin/utaipan-verify-nQ1chXbOIh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0855f6b4-3b76-43d0-8de8-2e219f02028a/bin/utaipan-verify-nQ1chXbOIh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0855f6b4-3b76-43d0-8de8-2e219f02028a/bin/utaipan-verify-nQ1chXbOIh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0855f6b4-3b76-43d0-8de8-2e219f02028a/bin/utaipan-verify-nQ1chXbOIh/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-lopstr16/flag_loopdep_simple.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0855f6b4-3b76-43d0-8de8-2e219f02028a/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0855f6b4-3b76-43d0-8de8-2e219f02028a/bin/utaipan-verify-nQ1chXbOIh --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 2e1c46549da470f14361a9b2a5fb79d079bbffb4006138f4fef05b9b152f9be7 --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-12-02 17:50:42,230 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-12-02 17:50:42,324 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0855f6b4-3b76-43d0-8de8-2e219f02028a/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-12-02 17:50:42,329 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-12-02 17:50:42,330 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-12-02 17:50:42,359 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-12-02 17:50:42,360 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-12-02 17:50:42,360 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-12-02 17:50:42,361 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-12-02 17:50:42,362 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-12-02 17:50:42,362 INFO L153 SettingsManager]: * User list type=DISABLED [2023-12-02 17:50:42,363 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-12-02 17:50:42,363 INFO L153 SettingsManager]: * Explicit value domain=true [2023-12-02 17:50:42,364 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-12-02 17:50:42,365 INFO L153 SettingsManager]: * Octagon Domain=false [2023-12-02 17:50:42,365 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-12-02 17:50:42,366 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-12-02 17:50:42,366 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-12-02 17:50:42,367 INFO L153 SettingsManager]: * Interval Domain=false [2023-12-02 17:50:42,367 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-12-02 17:50:42,368 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-12-02 17:50:42,369 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-12-02 17:50:42,370 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-12-02 17:50:42,370 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-12-02 17:50:42,371 INFO L153 SettingsManager]: * sizeof long=4 [2023-12-02 17:50:42,371 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-12-02 17:50:42,372 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-12-02 17:50:42,372 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-12-02 17:50:42,373 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-12-02 17:50:42,373 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-12-02 17:50:42,374 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-12-02 17:50:42,374 INFO L153 SettingsManager]: * sizeof long double=12 [2023-12-02 17:50:42,375 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-12-02 17:50:42,375 INFO L153 SettingsManager]: * Use constant arrays=true [2023-12-02 17:50:42,375 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-12-02 17:50:42,376 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-12-02 17:50:42,376 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-12-02 17:50:42,376 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 17:50:42,376 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-12-02 17:50:42,376 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-12-02 17:50:42,377 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-12-02 17:50:42,377 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-12-02 17:50:42,377 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-12-02 17:50:42,378 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-12-02 17:50:42,378 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-12-02 17:50:42,378 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-12-02 17:50:42,378 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-12-02 17:50:42,378 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_0855f6b4-3b76-43d0-8de8-2e219f02028a/bin/utaipan-verify-nQ1chXbOIh/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0855f6b4-3b76-43d0-8de8-2e219f02028a/bin/utaipan-verify-nQ1chXbOIh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 2e1c46549da470f14361a9b2a5fb79d079bbffb4006138f4fef05b9b152f9be7 [2023-12-02 17:50:42,661 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-12-02 17:50:42,686 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-12-02 17:50:42,689 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-12-02 17:50:42,691 INFO L270 PluginConnector]: Initializing CDTParser... [2023-12-02 17:50:42,691 INFO L274 PluginConnector]: CDTParser initialized [2023-12-02 17:50:42,693 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0855f6b4-3b76-43d0-8de8-2e219f02028a/bin/utaipan-verify-nQ1chXbOIh/../../sv-benchmarks/c/array-lopstr16/flag_loopdep_simple.i [2023-12-02 17:50:45,709 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-12-02 17:50:45,893 INFO L384 CDTParser]: Found 1 translation units. [2023-12-02 17:50:45,893 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0855f6b4-3b76-43d0-8de8-2e219f02028a/sv-benchmarks/c/array-lopstr16/flag_loopdep_simple.i [2023-12-02 17:50:45,910 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0855f6b4-3b76-43d0-8de8-2e219f02028a/bin/utaipan-verify-nQ1chXbOIh/data/e71505b65/0289ba92bc06438eb0f10f25f6c917f6/FLAGc4d8c4346 [2023-12-02 17:50:45,924 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0855f6b4-3b76-43d0-8de8-2e219f02028a/bin/utaipan-verify-nQ1chXbOIh/data/e71505b65/0289ba92bc06438eb0f10f25f6c917f6 [2023-12-02 17:50:45,927 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-12-02 17:50:45,929 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-12-02 17:50:45,931 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-12-02 17:50:45,931 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-12-02 17:50:45,944 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-12-02 17:50:45,944 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 05:50:45" (1/1) ... [2023-12-02 17:50:45,946 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1a79d0c3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 05:50:45, skipping insertion in model container [2023-12-02 17:50:45,946 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 05:50:45" (1/1) ... [2023-12-02 17:50:45,974 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-12-02 17:50:46,126 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_0855f6b4-3b76-43d0-8de8-2e219f02028a/sv-benchmarks/c/array-lopstr16/flag_loopdep_simple.i[812,825] [2023-12-02 17:50:46,146 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 17:50:46,156 INFO L202 MainTranslator]: Completed pre-run [2023-12-02 17:50:46,169 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_0855f6b4-3b76-43d0-8de8-2e219f02028a/sv-benchmarks/c/array-lopstr16/flag_loopdep_simple.i[812,825] [2023-12-02 17:50:46,177 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 17:50:46,194 INFO L206 MainTranslator]: Completed translation [2023-12-02 17:50:46,195 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 05:50:46 WrapperNode [2023-12-02 17:50:46,195 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-12-02 17:50:46,196 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-12-02 17:50:46,196 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-12-02 17:50:46,196 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-12-02 17:50:46,204 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 05:50:46" (1/1) ... [2023-12-02 17:50:46,210 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 05:50:46" (1/1) ... [2023-12-02 17:50:46,228 INFO L138 Inliner]: procedures = 17, calls = 14, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 64 [2023-12-02 17:50:46,229 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-12-02 17:50:46,230 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-12-02 17:50:46,230 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-12-02 17:50:46,230 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-12-02 17:50:46,241 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 05:50:46" (1/1) ... [2023-12-02 17:50:46,241 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 05:50:46" (1/1) ... [2023-12-02 17:50:46,243 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 05:50:46" (1/1) ... [2023-12-02 17:50:46,244 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 05:50:46" (1/1) ... [2023-12-02 17:50:46,250 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 05:50:46" (1/1) ... [2023-12-02 17:50:46,255 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 05:50:46" (1/1) ... [2023-12-02 17:50:46,256 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 05:50:46" (1/1) ... [2023-12-02 17:50:46,258 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 05:50:46" (1/1) ... [2023-12-02 17:50:46,260 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-12-02 17:50:46,261 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-12-02 17:50:46,261 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-12-02 17:50:46,261 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-12-02 17:50:46,262 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 05:50:46" (1/1) ... [2023-12-02 17:50:46,269 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 17:50:46,282 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0855f6b4-3b76-43d0-8de8-2e219f02028a/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:50:46,295 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0855f6b4-3b76-43d0-8de8-2e219f02028a/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-12-02 17:50:46,301 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0855f6b4-3b76-43d0-8de8-2e219f02028a/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-12-02 17:50:46,335 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-12-02 17:50:46,335 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-12-02 17:50:46,335 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-12-02 17:50:46,335 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-12-02 17:50:46,336 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-12-02 17:50:46,336 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-12-02 17:50:46,336 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-12-02 17:50:46,336 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-12-02 17:50:46,407 INFO L241 CfgBuilder]: Building ICFG [2023-12-02 17:50:46,410 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-12-02 17:50:46,537 INFO L282 CfgBuilder]: Performing block encoding [2023-12-02 17:50:46,582 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-12-02 17:50:46,582 INFO L309 CfgBuilder]: Removed 3 assume(true) statements. [2023-12-02 17:50:46,584 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 05:50:46 BoogieIcfgContainer [2023-12-02 17:50:46,584 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-12-02 17:50:46,587 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-12-02 17:50:46,587 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-12-02 17:50:46,590 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-12-02 17:50:46,591 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.12 05:50:45" (1/3) ... [2023-12-02 17:50:46,591 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@11922ae0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 05:50:46, skipping insertion in model container [2023-12-02 17:50:46,592 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 05:50:46" (2/3) ... [2023-12-02 17:50:46,592 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@11922ae0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 05:50:46, skipping insertion in model container [2023-12-02 17:50:46,592 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 05:50:46" (3/3) ... [2023-12-02 17:50:46,594 INFO L112 eAbstractionObserver]: Analyzing ICFG flag_loopdep_simple.i [2023-12-02 17:50:46,609 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-12-02 17:50:46,609 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-12-02 17:50:46,650 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-12-02 17:50:46,656 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;@63c65985, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-12-02 17:50:46,656 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-12-02 17:50:46,659 INFO L276 IsEmpty]: Start isEmpty. Operand has 11 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:50:46,664 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-12-02 17:50:46,664 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:50:46,665 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:50:46,665 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:50:46,669 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:50:46,670 INFO L85 PathProgramCache]: Analyzing trace with hash 721191376, now seen corresponding path program 1 times [2023-12-02 17:50:46,677 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:50:46,677 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [340467747] [2023-12-02 17:50:46,677 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:50:46,678 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:50:46,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:50:46,908 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 17:50:46,908 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:50:46,909 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [340467747] [2023-12-02 17:50:46,909 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [340467747] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 17:50:46,909 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 17:50:46,910 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-12-02 17:50:46,911 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1092905724] [2023-12-02 17:50:46,912 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 17:50:46,917 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 17:50:46,917 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:50:46,946 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 17:50:46,946 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 17:50:46,948 INFO L87 Difference]: Start difference. First operand has 11 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 10 states have internal predecessors, (15), 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 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:50:46,980 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:50:46,980 INFO L93 Difference]: Finished difference Result 21 states and 29 transitions. [2023-12-02 17:50:46,981 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 17:50:46,983 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 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 7 [2023-12-02 17:50:46,983 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:50:46,989 INFO L225 Difference]: With dead ends: 21 [2023-12-02 17:50:46,989 INFO L226 Difference]: Without dead ends: 11 [2023-12-02 17:50:46,991 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 17:50:46,994 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 0 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 17:50:46,995 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 16 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 17:50:47,009 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2023-12-02 17:50:47,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2023-12-02 17:50:47,019 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11 states, 10 states have (on average 1.4) internal successors, (14), 10 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:50:47,020 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 14 transitions. [2023-12-02 17:50:47,021 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 14 transitions. Word has length 7 [2023-12-02 17:50:47,021 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:50:47,021 INFO L495 AbstractCegarLoop]: Abstraction has 11 states and 14 transitions. [2023-12-02 17:50:47,022 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:50:47,022 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 14 transitions. [2023-12-02 17:50:47,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-12-02 17:50:47,022 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:50:47,022 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:50:47,023 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-12-02 17:50:47,023 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:50:47,024 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:50:47,024 INFO L85 PathProgramCache]: Analyzing trace with hash -1059237233, now seen corresponding path program 1 times [2023-12-02 17:50:47,024 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:50:47,024 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [690177172] [2023-12-02 17:50:47,024 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:50:47,025 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:50:47,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:50:47,089 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 17:50:47,089 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:50:47,089 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [690177172] [2023-12-02 17:50:47,089 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [690177172] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 17:50:47,090 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 17:50:47,090 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 17:50:47,090 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1249115837] [2023-12-02 17:50:47,090 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 17:50:47,092 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 17:50:47,092 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:50:47,092 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 17:50:47,093 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 17:50:47,093 INFO L87 Difference]: Start difference. First operand 11 states and 14 transitions. Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:50:47,120 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:50:47,120 INFO L93 Difference]: Finished difference Result 26 states and 32 transitions. [2023-12-02 17:50:47,121 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 17:50:47,121 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 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 8 [2023-12-02 17:50:47,121 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:50:47,122 INFO L225 Difference]: With dead ends: 26 [2023-12-02 17:50:47,122 INFO L226 Difference]: Without dead ends: 19 [2023-12-02 17:50:47,122 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 17:50:47,124 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 7 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 17:50:47,125 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 10 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 17:50:47,126 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2023-12-02 17:50:47,129 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 12. [2023-12-02 17:50:47,129 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 11 states have (on average 1.3636363636363635) internal successors, (15), 11 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:50:47,130 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 15 transitions. [2023-12-02 17:50:47,130 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 15 transitions. Word has length 8 [2023-12-02 17:50:47,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:50:47,130 INFO L495 AbstractCegarLoop]: Abstraction has 12 states and 15 transitions. [2023-12-02 17:50:47,131 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:50:47,131 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 15 transitions. [2023-12-02 17:50:47,131 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-12-02 17:50:47,131 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:50:47,131 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:50:47,132 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-12-02 17:50:47,132 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:50:47,132 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:50:47,133 INFO L85 PathProgramCache]: Analyzing trace with hash 1442945551, now seen corresponding path program 1 times [2023-12-02 17:50:47,133 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:50:47,133 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [582939621] [2023-12-02 17:50:47,133 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:50:47,134 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:50:47,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:50:47,203 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 17:50:47,203 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:50:47,204 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [582939621] [2023-12-02 17:50:47,204 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [582939621] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 17:50:47,204 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2075367076] [2023-12-02 17:50:47,204 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:50:47,205 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:50:47,205 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0855f6b4-3b76-43d0-8de8-2e219f02028a/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:50:47,209 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0855f6b4-3b76-43d0-8de8-2e219f02028a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:50:47,222 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0855f6b4-3b76-43d0-8de8-2e219f02028a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-12-02 17:50:47,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:50:47,306 INFO L262 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 5 conjunts are in the unsatisfiable core [2023-12-02 17:50:47,310 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:50:47,365 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 17:50:47,365 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:50:47,393 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 17:50:47,394 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2075367076] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:50:47,394 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2080390023] [2023-12-02 17:50:47,411 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-12-02 17:50:47,411 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:50:47,415 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:50:47,420 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:50:47,420 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:50:47,915 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:50:48,018 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '168#(and (not (= |ULTIMATE.start_main_#t~mem6#1| 0)) (= |ULTIMATE.start_main_~i~1#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_#t~mem6#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) |ULTIMATE.start_main_~#a~0#1.offset|)) (= |ULTIMATE.start_main_~flag~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 17:50:48,018 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:50:48,018 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 17:50:48,018 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 3, 3] total 8 [2023-12-02 17:50:48,019 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [639436033] [2023-12-02 17:50:48,019 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 17:50:48,020 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-12-02 17:50:48,020 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:50:48,020 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-12-02 17:50:48,021 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=79, Unknown=0, NotChecked=0, Total=110 [2023-12-02 17:50:48,021 INFO L87 Difference]: Start difference. First operand 12 states and 15 transitions. Second operand has 8 states, 8 states have (on average 2.125) internal successors, (17), 8 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:50:48,078 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:50:48,078 INFO L93 Difference]: Finished difference Result 39 states and 50 transitions. [2023-12-02 17:50:48,079 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-12-02 17:50:48,079 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.125) internal successors, (17), 8 states have internal predecessors, (17), 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 9 [2023-12-02 17:50:48,079 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:50:48,080 INFO L225 Difference]: With dead ends: 39 [2023-12-02 17:50:48,080 INFO L226 Difference]: Without dead ends: 30 [2023-12-02 17:50:48,080 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=79, Unknown=0, NotChecked=0, Total=110 [2023-12-02 17:50:48,082 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 21 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 17:50:48,082 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [21 Valid, 30 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 17:50:48,083 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2023-12-02 17:50:48,087 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 16. [2023-12-02 17:50:48,087 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 15 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:50:48,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 19 transitions. [2023-12-02 17:50:48,088 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 19 transitions. Word has length 9 [2023-12-02 17:50:48,088 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:50:48,088 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 19 transitions. [2023-12-02 17:50:48,088 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.125) internal successors, (17), 8 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:50:48,088 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 19 transitions. [2023-12-02 17:50:48,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-12-02 17:50:48,089 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:50:48,089 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:50:48,100 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0855f6b4-3b76-43d0-8de8-2e219f02028a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-12-02 17:50:48,290 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0855f6b4-3b76-43d0-8de8-2e219f02028a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:50:48,290 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:50:48,290 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:50:48,291 INFO L85 PathProgramCache]: Analyzing trace with hash 1375038800, now seen corresponding path program 2 times [2023-12-02 17:50:48,291 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:50:48,291 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1967767828] [2023-12-02 17:50:48,291 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:50:48,291 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:50:48,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:50:48,455 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-12-02 17:50:48,455 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:50:48,455 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1967767828] [2023-12-02 17:50:48,455 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1967767828] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 17:50:48,455 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1365580823] [2023-12-02 17:50:48,456 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 17:50:48,456 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:50:48,456 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0855f6b4-3b76-43d0-8de8-2e219f02028a/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:50:48,459 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0855f6b4-3b76-43d0-8de8-2e219f02028a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:50:48,473 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0855f6b4-3b76-43d0-8de8-2e219f02028a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-12-02 17:50:48,531 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-12-02 17:50:48,531 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 17:50:48,532 INFO L262 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 4 conjunts are in the unsatisfiable core [2023-12-02 17:50:48,534 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:50:48,563 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-12-02 17:50:48,563 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:50:48,605 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-12-02 17:50:48,606 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1365580823] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:50:48,606 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1097026022] [2023-12-02 17:50:48,610 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-12-02 17:50:48,610 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:50:48,610 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:50:48,611 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:50:48,611 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:50:48,863 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:50:48,966 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '334#(and (not (= |ULTIMATE.start_main_#t~mem6#1| 0)) (= |ULTIMATE.start_main_~i~1#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_#t~mem6#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) |ULTIMATE.start_main_~#a~0#1.offset|)) (= |ULTIMATE.start_main_~flag~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 17:50:48,966 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:50:48,966 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 17:50:48,966 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 5] total 13 [2023-12-02 17:50:48,966 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [699034000] [2023-12-02 17:50:48,966 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 17:50:48,967 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-12-02 17:50:48,967 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:50:48,968 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-12-02 17:50:48,969 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=195, Unknown=0, NotChecked=0, Total=272 [2023-12-02 17:50:48,969 INFO L87 Difference]: Start difference. First operand 16 states and 19 transitions. Second operand has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 13 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:50:49,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:50:49,052 INFO L93 Difference]: Finished difference Result 67 states and 82 transitions. [2023-12-02 17:50:49,053 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-12-02 17:50:49,053 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 13 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2023-12-02 17:50:49,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:50:49,054 INFO L225 Difference]: With dead ends: 67 [2023-12-02 17:50:49,054 INFO L226 Difference]: Without dead ends: 57 [2023-12-02 17:50:49,055 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 78 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=77, Invalid=195, Unknown=0, NotChecked=0, Total=272 [2023-12-02 17:50:49,056 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 84 mSDsluCounter, 35 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 84 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 65 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 17:50:49,057 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [84 Valid, 40 Invalid, 65 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 17:50:49,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2023-12-02 17:50:49,062 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 21. [2023-12-02 17:50:49,062 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 20 states have (on average 1.2) internal successors, (24), 20 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:50:49,063 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 24 transitions. [2023-12-02 17:50:49,063 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 24 transitions. Word has length 13 [2023-12-02 17:50:49,063 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:50:49,063 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 24 transitions. [2023-12-02 17:50:49,064 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 13 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:50:49,064 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 24 transitions. [2023-12-02 17:50:49,064 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-12-02 17:50:49,064 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:50:49,065 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:50:49,068 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0855f6b4-3b76-43d0-8de8-2e219f02028a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-12-02 17:50:49,265 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0855f6b4-3b76-43d0-8de8-2e219f02028a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:50:49,265 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:50:49,266 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:50:49,266 INFO L85 PathProgramCache]: Analyzing trace with hash 1867264719, now seen corresponding path program 3 times [2023-12-02 17:50:49,266 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:50:49,266 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1017668182] [2023-12-02 17:50:49,266 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:50:49,267 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:50:49,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:50:49,451 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-12-02 17:50:49,451 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:50:49,452 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1017668182] [2023-12-02 17:50:49,452 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1017668182] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 17:50:49,452 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [373438152] [2023-12-02 17:50:49,452 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 17:50:49,452 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:50:49,452 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0855f6b4-3b76-43d0-8de8-2e219f02028a/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:50:49,454 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0855f6b4-3b76-43d0-8de8-2e219f02028a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:50:49,461 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0855f6b4-3b76-43d0-8de8-2e219f02028a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-12-02 17:50:49,541 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 17:50:49,541 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 17:50:49,542 INFO L262 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 9 conjunts are in the unsatisfiable core [2023-12-02 17:50:49,544 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:50:49,650 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-12-02 17:50:49,651 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:50:49,789 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-12-02 17:50:49,789 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [373438152] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:50:49,793 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1853872820] [2023-12-02 17:50:49,795 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-12-02 17:50:49,796 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:50:49,796 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:50:49,796 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:50:49,796 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:50:50,194 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:50:50,358 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '586#(and (not (= |ULTIMATE.start_main_#t~mem6#1| 0)) (= |ULTIMATE.start_main_~i~1#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_#t~mem6#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) |ULTIMATE.start_main_~#a~0#1.offset|)) (= |ULTIMATE.start_main_~flag~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 17:50:50,358 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:50:50,358 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 17:50:50,358 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 19 [2023-12-02 17:50:50,358 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1535653353] [2023-12-02 17:50:50,358 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 17:50:50,359 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2023-12-02 17:50:50,359 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:50:50,360 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2023-12-02 17:50:50,360 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=191, Invalid=409, Unknown=0, NotChecked=0, Total=600 [2023-12-02 17:50:50,360 INFO L87 Difference]: Start difference. First operand 21 states and 24 transitions. Second operand has 20 states, 20 states have (on average 1.35) internal successors, (27), 19 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:50:50,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:50:50,396 INFO L93 Difference]: Finished difference Result 42 states and 54 transitions. [2023-12-02 17:50:50,398 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-12-02 17:50:50,398 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.35) internal successors, (27), 19 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 18 [2023-12-02 17:50:50,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:50:50,399 INFO L225 Difference]: With dead ends: 42 [2023-12-02 17:50:50,399 INFO L226 Difference]: Without dead ends: 28 [2023-12-02 17:50:50,400 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=191, Invalid=409, Unknown=0, NotChecked=0, Total=600 [2023-12-02 17:50:50,401 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 0 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 26 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 17:50:50,401 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 24 Invalid, 26 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 17:50:50,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2023-12-02 17:50:50,405 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2023-12-02 17:50:50,406 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 27 states have (on average 1.1481481481481481) internal successors, (31), 27 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:50:50,406 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 31 transitions. [2023-12-02 17:50:50,406 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 31 transitions. Word has length 18 [2023-12-02 17:50:50,406 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:50:50,407 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 31 transitions. [2023-12-02 17:50:50,407 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.35) internal successors, (27), 19 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:50:50,407 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 31 transitions. [2023-12-02 17:50:50,408 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-12-02 17:50:50,408 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:50:50,408 INFO L195 NwaCegarLoop]: trace histogram [12, 6, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:50:50,413 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0855f6b4-3b76-43d0-8de8-2e219f02028a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-12-02 17:50:50,612 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0855f6b4-3b76-43d0-8de8-2e219f02028a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:50:50,613 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:50:50,613 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:50:50,613 INFO L85 PathProgramCache]: Analyzing trace with hash 1534735440, now seen corresponding path program 4 times [2023-12-02 17:50:50,613 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:50:50,613 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [179747172] [2023-12-02 17:50:50,613 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:50:50,614 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:50:50,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:50:51,013 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-12-02 17:50:51,014 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:50:51,014 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [179747172] [2023-12-02 17:50:51,014 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [179747172] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 17:50:51,014 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [639122442] [2023-12-02 17:50:51,014 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 17:50:51,014 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:50:51,014 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0855f6b4-3b76-43d0-8de8-2e219f02028a/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:50:51,015 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0855f6b4-3b76-43d0-8de8-2e219f02028a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:50:51,021 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0855f6b4-3b76-43d0-8de8-2e219f02028a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-12-02 17:50:51,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:50:51,110 INFO L262 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 16 conjunts are in the unsatisfiable core [2023-12-02 17:50:51,112 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:50:51,457 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-12-02 17:50:51,457 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:50:51,942 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-12-02 17:50:51,942 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [639122442] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:50:51,942 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1376042938] [2023-12-02 17:50:51,944 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-12-02 17:50:51,944 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:50:51,945 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:50:51,945 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:50:51,945 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:50:52,245 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:50:52,455 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '896#(and (not (= |ULTIMATE.start_main_#t~mem6#1| 0)) (= |ULTIMATE.start_main_~i~1#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_#t~mem6#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) |ULTIMATE.start_main_~#a~0#1.offset|)) (= |ULTIMATE.start_main_~flag~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 17:50:52,455 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:50:52,455 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 17:50:52,455 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 40 [2023-12-02 17:50:52,455 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1013942019] [2023-12-02 17:50:52,455 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 17:50:52,456 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2023-12-02 17:50:52,456 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:50:52,458 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2023-12-02 17:50:52,459 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=758, Invalid=1312, Unknown=0, NotChecked=0, Total=2070 [2023-12-02 17:50:52,459 INFO L87 Difference]: Start difference. First operand 28 states and 31 transitions. Second operand has 41 states, 41 states have (on average 1.170731707317073) internal successors, (48), 40 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:50:52,526 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:50:52,526 INFO L93 Difference]: Finished difference Result 56 states and 75 transitions. [2023-12-02 17:50:52,526 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2023-12-02 17:50:52,527 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.170731707317073) internal successors, (48), 40 states have internal predecessors, (48), 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 25 [2023-12-02 17:50:52,527 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:50:52,527 INFO L225 Difference]: With dead ends: 56 [2023-12-02 17:50:52,528 INFO L226 Difference]: Without dead ends: 42 [2023-12-02 17:50:52,529 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 316 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=758, Invalid=1312, Unknown=0, NotChecked=0, Total=2070 [2023-12-02 17:50:52,530 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 0 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 17:50:52,531 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 40 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 17:50:52,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2023-12-02 17:50:52,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2023-12-02 17:50:52,538 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 41 states have (on average 1.0975609756097562) internal successors, (45), 41 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:50:52,539 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 45 transitions. [2023-12-02 17:50:52,539 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 45 transitions. Word has length 25 [2023-12-02 17:50:52,539 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:50:52,539 INFO L495 AbstractCegarLoop]: Abstraction has 42 states and 45 transitions. [2023-12-02 17:50:52,539 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 1.170731707317073) internal successors, (48), 40 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:50:52,540 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 45 transitions. [2023-12-02 17:50:52,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2023-12-02 17:50:52,541 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:50:52,541 INFO L195 NwaCegarLoop]: trace histogram [26, 6, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:50:52,547 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0855f6b4-3b76-43d0-8de8-2e219f02028a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-12-02 17:50:52,744 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0855f6b4-3b76-43d0-8de8-2e219f02028a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2023-12-02 17:50:52,745 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:50:52,745 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:50:52,745 INFO L85 PathProgramCache]: Analyzing trace with hash 1608088432, now seen corresponding path program 5 times [2023-12-02 17:50:52,745 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:50:52,745 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1670141857] [2023-12-02 17:50:52,745 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:50:52,746 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:50:52,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:50:53,767 INFO L134 CoverageAnalysis]: Checked inductivity of 372 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-12-02 17:50:53,767 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:50:53,767 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1670141857] [2023-12-02 17:50:53,767 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1670141857] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 17:50:53,768 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1025322115] [2023-12-02 17:50:53,768 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 17:50:53,768 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:50:53,768 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0855f6b4-3b76-43d0-8de8-2e219f02028a/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:50:53,769 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0855f6b4-3b76-43d0-8de8-2e219f02028a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:50:53,770 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0855f6b4-3b76-43d0-8de8-2e219f02028a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-12-02 17:50:53,881 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-12-02 17:50:53,881 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 17:50:53,883 INFO L262 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 8 conjunts are in the unsatisfiable core [2023-12-02 17:50:53,886 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:50:54,017 INFO L134 CoverageAnalysis]: Checked inductivity of 372 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 351 trivial. 0 not checked. [2023-12-02 17:50:54,017 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:50:54,173 INFO L134 CoverageAnalysis]: Checked inductivity of 372 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 351 trivial. 0 not checked. [2023-12-02 17:50:54,173 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1025322115] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:50:54,173 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1450145535] [2023-12-02 17:50:54,175 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-12-02 17:50:54,175 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:50:54,175 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:50:54,176 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:50:54,176 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:50:54,432 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:50:54,591 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1348#(and (not (= |ULTIMATE.start_main_#t~mem6#1| 0)) (= |ULTIMATE.start_main_~i~1#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_#t~mem6#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) |ULTIMATE.start_main_~#a~0#1.offset|)) (= |ULTIMATE.start_main_~flag~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 17:50:54,591 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:50:54,591 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 17:50:54,591 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 9, 9] total 43 [2023-12-02 17:50:54,591 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1523953243] [2023-12-02 17:50:54,591 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 17:50:54,592 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2023-12-02 17:50:54,592 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:50:54,593 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2023-12-02 17:50:54,594 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=583, Invalid=1673, Unknown=0, NotChecked=0, Total=2256 [2023-12-02 17:50:54,595 INFO L87 Difference]: Start difference. First operand 42 states and 45 transitions. Second operand has 43 states, 43 states have (on average 1.2093023255813953) internal successors, (52), 43 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:50:54,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:50:54,753 INFO L93 Difference]: Finished difference Result 157 states and 184 transitions. [2023-12-02 17:50:54,754 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2023-12-02 17:50:54,754 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 1.2093023255813953) internal successors, (52), 43 states have internal predecessors, (52), 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 39 [2023-12-02 17:50:54,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:50:54,755 INFO L225 Difference]: With dead ends: 157 [2023-12-02 17:50:54,755 INFO L226 Difference]: Without dead ends: 143 [2023-12-02 17:50:54,757 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 97 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 612 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=583, Invalid=1673, Unknown=0, NotChecked=0, Total=2256 [2023-12-02 17:50:54,758 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 182 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 111 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 182 SdHoareTripleChecker+Valid, 80 SdHoareTripleChecker+Invalid, 139 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 111 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 17:50:54,758 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [182 Valid, 80 Invalid, 139 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 111 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 17:50:54,759 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2023-12-02 17:50:54,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 51. [2023-12-02 17:50:54,769 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 50 states have (on average 1.08) internal successors, (54), 50 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:50:54,769 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 54 transitions. [2023-12-02 17:50:54,769 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 54 transitions. Word has length 39 [2023-12-02 17:50:54,770 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:50:54,770 INFO L495 AbstractCegarLoop]: Abstraction has 51 states and 54 transitions. [2023-12-02 17:50:54,770 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 1.2093023255813953) internal successors, (52), 43 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:50:54,770 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 54 transitions. [2023-12-02 17:50:54,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2023-12-02 17:50:54,771 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:50:54,771 INFO L195 NwaCegarLoop]: trace histogram [27, 14, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:50:54,776 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0855f6b4-3b76-43d0-8de8-2e219f02028a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-12-02 17:50:54,971 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0855f6b4-3b76-43d0-8de8-2e219f02028a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-12-02 17:50:54,972 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:50:54,972 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:50:54,972 INFO L85 PathProgramCache]: Analyzing trace with hash -2132561873, now seen corresponding path program 6 times [2023-12-02 17:50:54,972 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:50:54,973 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1490088994] [2023-12-02 17:50:54,973 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:50:54,973 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:50:55,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:50:55,890 INFO L134 CoverageAnalysis]: Checked inductivity of 483 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2023-12-02 17:50:55,890 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:50:55,890 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1490088994] [2023-12-02 17:50:55,890 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1490088994] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 17:50:55,890 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1384451929] [2023-12-02 17:50:55,890 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 17:50:55,890 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:50:55,890 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0855f6b4-3b76-43d0-8de8-2e219f02028a/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:50:55,891 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0855f6b4-3b76-43d0-8de8-2e219f02028a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:50:55,892 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0855f6b4-3b76-43d0-8de8-2e219f02028a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-12-02 17:50:56,002 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 17:50:56,002 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 17:50:56,004 INFO L262 TraceCheckSpWp]: Trace formula consists of 362 conjuncts, 31 conjunts are in the unsatisfiable core [2023-12-02 17:50:56,007 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:50:56,985 INFO L134 CoverageAnalysis]: Checked inductivity of 483 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2023-12-02 17:50:56,985 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:50:58,839 INFO L134 CoverageAnalysis]: Checked inductivity of 483 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2023-12-02 17:50:58,840 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1384451929] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:50:58,840 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [625271013] [2023-12-02 17:50:58,842 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-12-02 17:50:58,842 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:50:58,842 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:50:58,842 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:50:58,843 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:50:59,022 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:50:59,233 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2039#(and (not (= |ULTIMATE.start_main_#t~mem6#1| 0)) (= |ULTIMATE.start_main_~i~1#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_#t~mem6#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) |ULTIMATE.start_main_~#a~0#1.offset|)) (= |ULTIMATE.start_main_~flag~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 17:50:59,234 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:50:59,234 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 17:50:59,234 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 85 [2023-12-02 17:50:59,234 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [521334643] [2023-12-02 17:50:59,234 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 17:50:59,235 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 86 states [2023-12-02 17:50:59,235 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:50:59,238 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2023-12-02 17:50:59,242 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3288, Invalid=4722, Unknown=0, NotChecked=0, Total=8010 [2023-12-02 17:50:59,243 INFO L87 Difference]: Start difference. First operand 51 states and 54 transitions. Second operand has 86 states, 86 states have (on average 1.0813953488372092) internal successors, (93), 85 states have internal predecessors, (93), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:50:59,367 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:50:59,367 INFO L93 Difference]: Finished difference Result 102 states and 136 transitions. [2023-12-02 17:50:59,368 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2023-12-02 17:50:59,368 INFO L78 Accepts]: Start accepts. Automaton has has 86 states, 86 states have (on average 1.0813953488372092) internal successors, (93), 85 states have internal predecessors, (93), 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 48 [2023-12-02 17:50:59,368 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:50:59,369 INFO L225 Difference]: With dead ends: 102 [2023-12-02 17:50:59,369 INFO L226 Difference]: Without dead ends: 80 [2023-12-02 17:50:59,373 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 171 GetRequests, 83 SyntacticMatches, 0 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 791 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=3288, Invalid=4722, Unknown=0, NotChecked=0, Total=8010 [2023-12-02 17:50:59,374 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 0 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 84 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 85 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 84 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 17:50:59,374 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 32 Invalid, 85 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 84 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 17:50:59,375 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2023-12-02 17:50:59,385 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 80. [2023-12-02 17:50:59,385 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 79 states have (on average 1.0506329113924051) internal successors, (83), 79 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:50:59,386 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 83 transitions. [2023-12-02 17:50:59,386 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 83 transitions. Word has length 48 [2023-12-02 17:50:59,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:50:59,387 INFO L495 AbstractCegarLoop]: Abstraction has 80 states and 83 transitions. [2023-12-02 17:50:59,387 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 86 states, 86 states have (on average 1.0813953488372092) internal successors, (93), 85 states have internal predecessors, (93), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:50:59,387 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 83 transitions. [2023-12-02 17:50:59,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2023-12-02 17:50:59,390 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:50:59,390 INFO L195 NwaCegarLoop]: trace histogram [56, 14, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:50:59,396 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0855f6b4-3b76-43d0-8de8-2e219f02028a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-12-02 17:50:59,592 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0855f6b4-3b76-43d0-8de8-2e219f02028a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2023-12-02 17:50:59,593 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:50:59,593 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:50:59,593 INFO L85 PathProgramCache]: Analyzing trace with hash 1933858960, now seen corresponding path program 7 times [2023-12-02 17:50:59,593 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:50:59,593 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1623148560] [2023-12-02 17:50:59,593 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:50:59,594 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:50:59,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:51:02,327 INFO L134 CoverageAnalysis]: Checked inductivity of 1701 backedges. 0 proven. 1596 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2023-12-02 17:51:02,327 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:51:02,327 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1623148560] [2023-12-02 17:51:02,327 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1623148560] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 17:51:02,327 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1631085592] [2023-12-02 17:51:02,327 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 17:51:02,328 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:51:02,328 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0855f6b4-3b76-43d0-8de8-2e219f02028a/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:51:02,328 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0855f6b4-3b76-43d0-8de8-2e219f02028a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:51:02,329 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0855f6b4-3b76-43d0-8de8-2e219f02028a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-12-02 17:51:02,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:51:02,508 INFO L262 TraceCheckSpWp]: Trace formula consists of 623 conjuncts, 60 conjunts are in the unsatisfiable core [2023-12-02 17:51:02,513 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:51:06,546 INFO L134 CoverageAnalysis]: Checked inductivity of 1701 backedges. 0 proven. 1596 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2023-12-02 17:51:06,547 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:51:13,400 INFO L134 CoverageAnalysis]: Checked inductivity of 1701 backedges. 0 proven. 1596 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2023-12-02 17:51:13,400 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1631085592] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:51:13,401 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1212152812] [2023-12-02 17:51:13,402 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-12-02 17:51:13,403 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:51:13,403 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:51:13,403 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:51:13,403 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:51:13,595 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:51:13,919 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3016#(and (not (= |ULTIMATE.start_main_#t~mem6#1| 0)) (= |ULTIMATE.start_main_~i~1#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_#t~mem6#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) |ULTIMATE.start_main_~#a~0#1.offset|)) (= |ULTIMATE.start_main_~flag~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 17:51:13,919 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:51:13,919 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 17:51:13,919 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 58, 58] total 172 [2023-12-02 17:51:13,919 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1623898083] [2023-12-02 17:51:13,919 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 17:51:13,920 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 173 states [2023-12-02 17:51:13,920 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:51:13,924 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 173 interpolants. [2023-12-02 17:51:13,932 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13293, Invalid=17859, Unknown=0, NotChecked=0, Total=31152 [2023-12-02 17:51:13,932 INFO L87 Difference]: Start difference. First operand 80 states and 83 transitions. Second operand has 173 states, 173 states have (on average 1.0404624277456647) internal successors, (180), 172 states have internal predecessors, (180), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:51:14,181 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:51:14,181 INFO L93 Difference]: Finished difference Result 160 states and 223 transitions. [2023-12-02 17:51:14,181 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 116 states. [2023-12-02 17:51:14,182 INFO L78 Accepts]: Start accepts. Automaton has has 173 states, 173 states have (on average 1.0404624277456647) internal successors, (180), 172 states have internal predecessors, (180), 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 77 [2023-12-02 17:51:14,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:51:14,183 INFO L225 Difference]: With dead ends: 160 [2023-12-02 17:51:14,183 INFO L226 Difference]: Without dead ends: 138 [2023-12-02 17:51:14,189 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 287 GetRequests, 112 SyntacticMatches, 0 SemanticMatches, 175 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2444 ImplicationChecksByTransitivity, 12.4s TimeCoverageRelationStatistics Valid=13293, Invalid=17859, Unknown=0, NotChecked=0, Total=31152 [2023-12-02 17:51:14,189 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 0 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 157 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 158 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 157 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 17:51:14,190 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 40 Invalid, 158 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 157 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 17:51:14,191 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2023-12-02 17:51:14,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 138. [2023-12-02 17:51:14,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 138 states, 137 states have (on average 1.0291970802919708) internal successors, (141), 137 states have internal predecessors, (141), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:51:14,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 141 transitions. [2023-12-02 17:51:14,209 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 141 transitions. Word has length 77 [2023-12-02 17:51:14,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:51:14,210 INFO L495 AbstractCegarLoop]: Abstraction has 138 states and 141 transitions. [2023-12-02 17:51:14,211 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 173 states, 173 states have (on average 1.0404624277456647) internal successors, (180), 172 states have internal predecessors, (180), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:51:14,211 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 141 transitions. [2023-12-02 17:51:14,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2023-12-02 17:51:14,214 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:51:14,214 INFO L195 NwaCegarLoop]: trace histogram [114, 14, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:51:14,221 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0855f6b4-3b76-43d0-8de8-2e219f02028a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2023-12-02 17:51:14,421 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0855f6b4-3b76-43d0-8de8-2e219f02028a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:51:14,422 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:51:14,422 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:51:14,422 INFO L85 PathProgramCache]: Analyzing trace with hash -1936526096, now seen corresponding path program 8 times [2023-12-02 17:51:14,422 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:51:14,422 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [467638265] [2023-12-02 17:51:14,422 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:51:14,422 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:51:14,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:51:24,529 INFO L134 CoverageAnalysis]: Checked inductivity of 6660 backedges. 0 proven. 6555 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2023-12-02 17:51:24,529 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:51:24,529 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [467638265] [2023-12-02 17:51:24,529 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [467638265] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 17:51:24,529 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1684250134] [2023-12-02 17:51:24,530 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 17:51:24,530 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:51:24,530 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0855f6b4-3b76-43d0-8de8-2e219f02028a/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:51:24,531 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0855f6b4-3b76-43d0-8de8-2e219f02028a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:51:24,532 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0855f6b4-3b76-43d0-8de8-2e219f02028a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-12-02 17:51:24,826 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2023-12-02 17:51:24,827 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 17:51:24,829 INFO L262 TraceCheckSpWp]: Trace formula consists of 245 conjuncts, 16 conjunts are in the unsatisfiable core [2023-12-02 17:51:24,834 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:51:25,690 INFO L134 CoverageAnalysis]: Checked inductivity of 6660 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 6555 trivial. 0 not checked. [2023-12-02 17:51:25,690 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:51:26,593 INFO L134 CoverageAnalysis]: Checked inductivity of 6660 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 6555 trivial. 0 not checked. [2023-12-02 17:51:26,594 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1684250134] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:51:26,594 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1010892273] [2023-12-02 17:51:26,595 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-12-02 17:51:26,595 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:51:26,595 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:51:26,596 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:51:26,596 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:51:26,852 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:51:27,339 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4547#(and (not (= |ULTIMATE.start_main_#t~mem6#1| 0)) (= |ULTIMATE.start_main_~i~1#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_#t~mem6#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) |ULTIMATE.start_main_~#a~0#1.offset|)) (= |ULTIMATE.start_main_~flag~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 17:51:27,340 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:51:27,340 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 17:51:27,340 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [116, 17, 17] total 147 [2023-12-02 17:51:27,340 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1103775468] [2023-12-02 17:51:27,340 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 17:51:27,341 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 147 states [2023-12-02 17:51:27,341 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:51:27,345 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 147 interpolants. [2023-12-02 17:51:27,347 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7387, Invalid=15565, Unknown=0, NotChecked=0, Total=22952 [2023-12-02 17:51:27,348 INFO L87 Difference]: Start difference. First operand 138 states and 141 transitions. Second operand has 147 states, 147 states have (on average 1.0612244897959184) internal successors, (156), 147 states have internal predecessors, (156), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:51:27,945 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:51:27,946 INFO L93 Difference]: Finished difference Result 381 states and 432 transitions. [2023-12-02 17:51:27,946 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 147 states. [2023-12-02 17:51:27,946 INFO L78 Accepts]: Start accepts. Automaton has has 147 states, 147 states have (on average 1.0612244897959184) internal successors, (156), 147 states have internal predecessors, (156), 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 135 [2023-12-02 17:51:27,947 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:51:27,949 INFO L225 Difference]: With dead ends: 381 [2023-12-02 17:51:27,949 INFO L226 Difference]: Without dead ends: 359 [2023-12-02 17:51:27,951 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 519 GetRequests, 369 SyntacticMatches, 0 SemanticMatches, 150 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4252 ImplicationChecksByTransitivity, 8.5s TimeCoverageRelationStatistics Valid=7387, Invalid=15565, Unknown=0, NotChecked=0, Total=22952 [2023-12-02 17:51:27,952 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 644 mSDsluCounter, 170 mSDsCounter, 0 mSdLazyCounter, 277 mSolverCounterSat, 94 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 644 SdHoareTripleChecker+Valid, 175 SdHoareTripleChecker+Invalid, 371 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 94 IncrementalHoareTripleChecker+Valid, 277 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 17:51:27,952 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [644 Valid, 175 Invalid, 371 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [94 Valid, 277 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 17:51:27,953 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 359 states. [2023-12-02 17:51:27,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 359 to 155. [2023-12-02 17:51:27,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 155 states, 154 states have (on average 1.025974025974026) internal successors, (158), 154 states have internal predecessors, (158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:51:27,971 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 158 transitions. [2023-12-02 17:51:27,972 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 158 transitions. Word has length 135 [2023-12-02 17:51:27,972 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:51:27,972 INFO L495 AbstractCegarLoop]: Abstraction has 155 states and 158 transitions. [2023-12-02 17:51:27,973 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 147 states, 147 states have (on average 1.0612244897959184) internal successors, (156), 147 states have internal predecessors, (156), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:51:27,973 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 158 transitions. [2023-12-02 17:51:27,975 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2023-12-02 17:51:27,975 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:51:27,976 INFO L195 NwaCegarLoop]: trace histogram [115, 30, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:51:27,981 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0855f6b4-3b76-43d0-8de8-2e219f02028a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2023-12-02 17:51:28,176 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0855f6b4-3b76-43d0-8de8-2e219f02028a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:51:28,177 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:51:28,177 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:51:28,177 INFO L85 PathProgramCache]: Analyzing trace with hash -747235921, now seen corresponding path program 9 times [2023-12-02 17:51:28,177 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:51:28,177 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [925980441] [2023-12-02 17:51:28,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:51:28,177 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:51:28,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:51:37,416 INFO L134 CoverageAnalysis]: Checked inductivity of 7135 backedges. 0 proven. 6670 refuted. 0 times theorem prover too weak. 465 trivial. 0 not checked. [2023-12-02 17:51:37,416 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:51:37,416 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [925980441] [2023-12-02 17:51:37,417 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [925980441] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 17:51:37,417 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1925331149] [2023-12-02 17:51:37,417 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 17:51:37,417 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:51:37,417 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0855f6b4-3b76-43d0-8de8-2e219f02028a/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:51:37,418 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0855f6b4-3b76-43d0-8de8-2e219f02028a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:51:37,419 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0855f6b4-3b76-43d0-8de8-2e219f02028a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-12-02 17:51:37,754 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 17:51:37,755 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 17:51:37,762 INFO L262 TraceCheckSpWp]: Trace formula consists of 1218 conjuncts, 119 conjunts are in the unsatisfiable core [2023-12-02 17:51:37,768 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:51:50,768 INFO L134 CoverageAnalysis]: Checked inductivity of 7135 backedges. 0 proven. 6670 refuted. 0 times theorem prover too weak. 465 trivial. 0 not checked. [2023-12-02 17:51:50,768 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:52:16,632 INFO L134 CoverageAnalysis]: Checked inductivity of 7135 backedges. 0 proven. 6670 refuted. 0 times theorem prover too weak. 465 trivial. 0 not checked. [2023-12-02 17:52:16,632 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1925331149] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:52:16,632 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1660307856] [2023-12-02 17:52:16,634 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-12-02 17:52:16,634 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:52:16,634 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:52:16,635 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:52:16,635 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:52:16,778 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:52:17,313 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6686#(and (not (= |ULTIMATE.start_main_#t~mem6#1| 0)) (= |ULTIMATE.start_main_~i~1#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_#t~mem6#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) |ULTIMATE.start_main_~#a~0#1.offset|)) (= |ULTIMATE.start_main_~flag~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 17:52:17,313 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:52:17,313 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 17:52:17,313 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [117, 117, 117] total 349 [2023-12-02 17:52:17,313 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1081164978] [2023-12-02 17:52:17,314 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 17:52:17,314 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 350 states [2023-12-02 17:52:17,315 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:52:17,323 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 350 interpolants. [2023-12-02 17:52:17,327 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=54416, Invalid=70546, Unknown=0, NotChecked=0, Total=124962 [2023-12-02 17:52:17,328 INFO L87 Difference]: Start difference. First operand 155 states and 158 transitions. Second operand has 350 states, 350 states have (on average 1.02) internal successors, (357), 349 states have internal predecessors, (357), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:52:18,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:52:18,354 INFO L93 Difference]: Finished difference Result 310 states and 432 transitions. [2023-12-02 17:52:18,354 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 234 states. [2023-12-02 17:52:18,355 INFO L78 Accepts]: Start accepts. Automaton has has 350 states, 350 states have (on average 1.02) internal successors, (357), 349 states have internal predecessors, (357), 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 152 [2023-12-02 17:52:18,356 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:52:18,357 INFO L225 Difference]: With dead ends: 310 [2023-12-02 17:52:18,357 INFO L226 Difference]: Without dead ends: 272 [2023-12-02 17:52:18,362 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 571 GetRequests, 219 SyntacticMatches, 0 SemanticMatches, 352 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8403 ImplicationChecksByTransitivity, 44.6s TimeCoverageRelationStatistics Valid=54416, Invalid=70546, Unknown=0, NotChecked=0, Total=124962 [2023-12-02 17:52:18,363 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 0 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 310 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 311 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 310 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 17:52:18,363 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 40 Invalid, 311 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 310 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 17:52:18,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 272 states. [2023-12-02 17:52:18,385 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 272 to 272. [2023-12-02 17:52:18,386 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 272 states, 271 states have (on average 1.014760147601476) internal successors, (275), 271 states have internal predecessors, (275), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:52:18,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 272 states to 272 states and 275 transitions. [2023-12-02 17:52:18,387 INFO L78 Accepts]: Start accepts. Automaton has 272 states and 275 transitions. Word has length 152 [2023-12-02 17:52:18,387 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:52:18,387 INFO L495 AbstractCegarLoop]: Abstraction has 272 states and 275 transitions. [2023-12-02 17:52:18,388 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 350 states, 350 states have (on average 1.02) internal successors, (357), 349 states have internal predecessors, (357), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:52:18,388 INFO L276 IsEmpty]: Start isEmpty. Operand 272 states and 275 transitions. [2023-12-02 17:52:18,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 270 [2023-12-02 17:52:18,393 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:52:18,393 INFO L195 NwaCegarLoop]: trace histogram [232, 30, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:52:18,412 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0855f6b4-3b76-43d0-8de8-2e219f02028a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2023-12-02 17:52:18,593 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0855f6b4-3b76-43d0-8de8-2e219f02028a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:52:18,594 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:52:18,594 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:52:18,594 INFO L85 PathProgramCache]: Analyzing trace with hash 2028063632, now seen corresponding path program 10 times [2023-12-02 17:52:18,594 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:52:18,594 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1184150310] [2023-12-02 17:52:18,594 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:52:18,594 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:52:19,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:52:52,499 INFO L134 CoverageAnalysis]: Checked inductivity of 27493 backedges. 0 proven. 27028 refuted. 0 times theorem prover too weak. 465 trivial. 0 not checked. [2023-12-02 17:52:52,499 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:52:52,499 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1184150310] [2023-12-02 17:52:52,499 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1184150310] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 17:52:52,499 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [108901283] [2023-12-02 17:52:52,499 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 17:52:52,499 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:52:52,499 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0855f6b4-3b76-43d0-8de8-2e219f02028a/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:52:52,500 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0855f6b4-3b76-43d0-8de8-2e219f02028a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:52:52,501 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0855f6b4-3b76-43d0-8de8-2e219f02028a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-12-02 17:52:53,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:52:53,043 INFO L262 TraceCheckSpWp]: Trace formula consists of 2271 conjuncts, 236 conjunts are in the unsatisfiable core [2023-12-02 17:52:53,054 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:53:53,321 INFO L134 CoverageAnalysis]: Checked inductivity of 27493 backedges. 0 proven. 27028 refuted. 0 times theorem prover too weak. 465 trivial. 0 not checked. [2023-12-02 17:53:53,321 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:55:56,678 INFO L134 CoverageAnalysis]: Checked inductivity of 27493 backedges. 0 proven. 27028 refuted. 0 times theorem prover too weak. 465 trivial. 0 not checked. [2023-12-02 17:55:56,678 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [108901283] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:55:56,679 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1115265593] [2023-12-02 17:55:56,680 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-12-02 17:55:56,681 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:55:56,681 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:55:56,681 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:55:56,681 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:55:56,928 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:55:58,560 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10143#(and (not (= |ULTIMATE.start_main_#t~mem6#1| 0)) (= |ULTIMATE.start_main_~i~1#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_#t~mem6#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) |ULTIMATE.start_main_~#a~0#1.offset|)) (= |ULTIMATE.start_main_~flag~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 17:55:58,560 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:55:58,560 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 17:55:58,561 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [234, 234, 234] total 700 [2023-12-02 17:55:58,561 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1169737451] [2023-12-02 17:55:58,561 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 17:55:58,562 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 701 states [2023-12-02 17:55:58,562 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:55:58,592 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 701 interpolants. [2023-12-02 17:55:58,615 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=218338, Invalid=279392, Unknown=0, NotChecked=0, Total=497730 [2023-12-02 17:55:58,617 INFO L87 Difference]: Start difference. First operand 272 states and 275 transitions. Second operand has 701 states, 701 states have (on average 1.0099857346647647) internal successors, (708), 700 states have internal predecessors, (708), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:56:05,980 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:56:05,980 INFO L93 Difference]: Finished difference Result 544 states and 783 transitions. [2023-12-02 17:56:05,981 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 468 states. [2023-12-02 17:56:05,982 INFO L78 Accepts]: Start accepts. Automaton has has 701 states, 701 states have (on average 1.0099857346647647) internal successors, (708), 700 states have internal predecessors, (708), 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 269 [2023-12-02 17:56:05,982 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:56:05,985 INFO L225 Difference]: With dead ends: 544 [2023-12-02 17:56:05,985 INFO L226 Difference]: Without dead ends: 506 [2023-12-02 17:56:06,011 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1039 GetRequests, 335 SyntacticMatches, 0 SemanticMatches, 704 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31446 ImplicationChecksByTransitivity, 206.2s TimeCoverageRelationStatistics Valid=218338, Invalid=279392, Unknown=0, NotChecked=0, Total=497730 [2023-12-02 17:56:06,011 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 0 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 606 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 72 SdHoareTripleChecker+Invalid, 607 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 606 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-12-02 17:56:06,012 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 72 Invalid, 607 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 606 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-12-02 17:56:06,013 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 506 states. [2023-12-02 17:56:06,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 506 to 506. [2023-12-02 17:56:06,043 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 506 states, 505 states have (on average 1.007920792079208) internal successors, (509), 505 states have internal predecessors, (509), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:56:06,045 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 506 states to 506 states and 509 transitions. [2023-12-02 17:56:06,045 INFO L78 Accepts]: Start accepts. Automaton has 506 states and 509 transitions. Word has length 269 [2023-12-02 17:56:06,046 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:56:06,046 INFO L495 AbstractCegarLoop]: Abstraction has 506 states and 509 transitions. [2023-12-02 17:56:06,047 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 701 states, 701 states have (on average 1.0099857346647647) internal successors, (708), 700 states have internal predecessors, (708), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:56:06,047 INFO L276 IsEmpty]: Start isEmpty. Operand 506 states and 509 transitions. [2023-12-02 17:56:06,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 504 [2023-12-02 17:56:06,054 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:56:06,054 INFO L195 NwaCegarLoop]: trace histogram [466, 30, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:56:06,063 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0855f6b4-3b76-43d0-8de8-2e219f02028a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2023-12-02 17:56:06,255 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0855f6b4-3b76-43d0-8de8-2e219f02028a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:56:06,255 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:56:06,256 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:56:06,256 INFO L85 PathProgramCache]: Analyzing trace with hash 1654471920, now seen corresponding path program 11 times [2023-12-02 17:56:06,256 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:56:06,256 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1868073864] [2023-12-02 17:56:06,256 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:56:06,256 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:56:08,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:58:42,213 INFO L134 CoverageAnalysis]: Checked inductivity of 109276 backedges. 0 proven. 108811 refuted. 0 times theorem prover too weak. 465 trivial. 0 not checked. [2023-12-02 17:58:42,214 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:58:42,214 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1868073864] [2023-12-02 17:58:42,214 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1868073864] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 17:58:42,214 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1588724118] [2023-12-02 17:58:42,214 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 17:58:42,214 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:58:42,214 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0855f6b4-3b76-43d0-8de8-2e219f02028a/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:58:42,216 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0855f6b4-3b76-43d0-8de8-2e219f02028a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:58:42,217 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0855f6b4-3b76-43d0-8de8-2e219f02028a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-12-02 17:58:45,186 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2023-12-02 17:58:45,186 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 17:58:45,192 INFO L262 TraceCheckSpWp]: Trace formula consists of 453 conjuncts, 32 conjunts are in the unsatisfiable core [2023-12-02 17:58:45,202 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:58:51,611 INFO L134 CoverageAnalysis]: Checked inductivity of 109276 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 108811 trivial. 0 not checked. [2023-12-02 17:58:51,611 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:58:58,603 INFO L134 CoverageAnalysis]: Checked inductivity of 109276 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 108811 trivial. 0 not checked. [2023-12-02 17:58:58,604 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1588724118] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:58:58,604 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1225855778] [2023-12-02 17:58:58,606 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-12-02 17:58:58,606 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:58:58,607 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:58:58,607 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:58:58,607 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:58:58,854 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:59:00,302 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15771#(and (not (= |ULTIMATE.start_main_#t~mem6#1| 0)) (= |ULTIMATE.start_main_~i~1#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_#t~mem6#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) |ULTIMATE.start_main_~#a~0#1.offset|)) (= |ULTIMATE.start_main_~flag~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 17:59:00,302 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:59:00,302 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 17:59:00,303 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [468, 33, 33] total 531 [2023-12-02 17:59:00,303 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1455116392] [2023-12-02 17:59:00,303 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 17:59:00,305 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 531 states [2023-12-02 17:59:00,305 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:59:00,321 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 531 interpolants. [2023-12-02 17:59:00,334 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=111963, Invalid=174797, Unknown=0, NotChecked=0, Total=286760 [2023-12-02 17:59:00,335 INFO L87 Difference]: Start difference. First operand 506 states and 509 transitions. Second operand has 531 states, 531 states have (on average 1.0169491525423728) internal successors, (540), 531 states have internal predecessors, (540), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:59:07,600 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:59:07,600 INFO L93 Difference]: Finished difference Result 1005 states and 1104 transitions. [2023-12-02 17:59:07,600 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 531 states. [2023-12-02 17:59:07,601 INFO L78 Accepts]: Start accepts. Automaton has has 531 states, 531 states have (on average 1.0169491525423728) internal successors, (540), 531 states have internal predecessors, (540), 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 503 [2023-12-02 17:59:07,602 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:59:07,605 INFO L225 Difference]: With dead ends: 1005 [2023-12-02 17:59:07,605 INFO L226 Difference]: Without dead ends: 967 [2023-12-02 17:59:07,615 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1975 GetRequests, 1441 SyntacticMatches, 0 SemanticMatches, 534 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31772 ImplicationChecksByTransitivity, 107.5s TimeCoverageRelationStatistics Valid=111963, Invalid=174797, Unknown=0, NotChecked=0, Total=286760 [2023-12-02 17:59:07,616 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 1435 mSDsluCounter, 335 mSDsCounter, 0 mSdLazyCounter, 777 mSolverCounterSat, 207 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1435 SdHoareTripleChecker+Valid, 340 SdHoareTripleChecker+Invalid, 984 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 207 IncrementalHoareTripleChecker+Valid, 777 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2023-12-02 17:59:07,616 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1435 Valid, 340 Invalid, 984 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [207 Valid, 777 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2023-12-02 17:59:07,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 967 states. [2023-12-02 17:59:07,666 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 967 to 539. [2023-12-02 17:59:07,667 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 539 states, 538 states have (on average 1.0074349442379182) internal successors, (542), 538 states have internal predecessors, (542), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:59:07,670 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 539 states to 539 states and 542 transitions. [2023-12-02 17:59:07,670 INFO L78 Accepts]: Start accepts. Automaton has 539 states and 542 transitions. Word has length 503 [2023-12-02 17:59:07,671 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:59:07,671 INFO L495 AbstractCegarLoop]: Abstraction has 539 states and 542 transitions. [2023-12-02 17:59:07,672 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 531 states, 531 states have (on average 1.0169491525423728) internal successors, (540), 531 states have internal predecessors, (540), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:59:07,672 INFO L276 IsEmpty]: Start isEmpty. Operand 539 states and 542 transitions. [2023-12-02 17:59:07,680 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 537 [2023-12-02 17:59:07,680 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:59:07,681 INFO L195 NwaCegarLoop]: trace histogram [467, 62, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:59:07,689 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0855f6b4-3b76-43d0-8de8-2e219f02028a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2023-12-02 17:59:07,881 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0855f6b4-3b76-43d0-8de8-2e219f02028a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:59:07,881 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:59:07,882 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:59:07,882 INFO L85 PathProgramCache]: Analyzing trace with hash -1577833553, now seen corresponding path program 12 times [2023-12-02 17:59:07,882 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:59:07,882 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1268579114] [2023-12-02 17:59:07,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:59:07,882 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:59:09,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:01:47,050 INFO L134 CoverageAnalysis]: Checked inductivity of 111231 backedges. 0 proven. 109278 refuted. 0 times theorem prover too weak. 1953 trivial. 0 not checked. [2023-12-02 18:01:47,050 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:01:47,050 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1268579114] [2023-12-02 18:01:47,050 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1268579114] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 18:01:47,050 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [216665523] [2023-12-02 18:01:47,050 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 18:01:47,051 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:01:47,051 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0855f6b4-3b76-43d0-8de8-2e219f02028a/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 18:01:47,051 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0855f6b4-3b76-43d0-8de8-2e219f02028a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 18:01:47,052 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0855f6b4-3b76-43d0-8de8-2e219f02028a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-12-02 18:01:48,232 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 18:01:48,232 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 18:01:48,267 INFO L262 TraceCheckSpWp]: Trace formula consists of 4514 conjuncts, 471 conjunts are in the unsatisfiable core [2023-12-02 18:01:48,285 INFO L285 TraceCheckSpWp]: Computing forward predicates...