./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loops-crafted-1/nested3-1_abstracted.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 0e0057cc Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6afdbd32-cc91-4e00-9d2e-7b370ed3243f/bin/utaipan-verify-nQ1chXbOIh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6afdbd32-cc91-4e00-9d2e-7b370ed3243f/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_6afdbd32-cc91-4e00-9d2e-7b370ed3243f/bin/utaipan-verify-nQ1chXbOIh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6afdbd32-cc91-4e00-9d2e-7b370ed3243f/bin/utaipan-verify-nQ1chXbOIh/config/TaipanReach.xml -i ../../sv-benchmarks/c/loops-crafted-1/nested3-1_abstracted.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6afdbd32-cc91-4e00-9d2e-7b370ed3243f/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_6afdbd32-cc91-4e00-9d2e-7b370ed3243f/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 898ef25fdb2ae04f56304d500631f410c196b9a77fbfba6f83248dcfc33b301f --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-12-02 16:50:37,205 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-12-02 16:50:37,267 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6afdbd32-cc91-4e00-9d2e-7b370ed3243f/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-12-02 16:50:37,273 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-12-02 16:50:37,274 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-12-02 16:50:37,299 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-12-02 16:50:37,300 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-12-02 16:50:37,300 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-12-02 16:50:37,301 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-12-02 16:50:37,301 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-12-02 16:50:37,302 INFO L153 SettingsManager]: * User list type=DISABLED [2023-12-02 16:50:37,302 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-12-02 16:50:37,303 INFO L153 SettingsManager]: * Explicit value domain=true [2023-12-02 16:50:37,303 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-12-02 16:50:37,304 INFO L153 SettingsManager]: * Octagon Domain=false [2023-12-02 16:50:37,304 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-12-02 16:50:37,305 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-12-02 16:50:37,305 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-12-02 16:50:37,306 INFO L153 SettingsManager]: * Interval Domain=false [2023-12-02 16:50:37,306 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-12-02 16:50:37,307 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-12-02 16:50:37,311 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-12-02 16:50:37,312 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-12-02 16:50:37,312 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-12-02 16:50:37,312 INFO L153 SettingsManager]: * sizeof long=4 [2023-12-02 16:50:37,313 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-12-02 16:50:37,313 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-12-02 16:50:37,313 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-12-02 16:50:37,314 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-12-02 16:50:37,314 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-12-02 16:50:37,314 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-12-02 16:50:37,315 INFO L153 SettingsManager]: * sizeof long double=12 [2023-12-02 16:50:37,315 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-12-02 16:50:37,315 INFO L153 SettingsManager]: * Use constant arrays=true [2023-12-02 16:50:37,315 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-12-02 16:50:37,316 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-12-02 16:50:37,316 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-12-02 16:50:37,316 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 16:50:37,316 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-12-02 16:50:37,316 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-12-02 16:50:37,317 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-12-02 16:50:37,317 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-12-02 16:50:37,317 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-12-02 16:50:37,317 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-12-02 16:50:37,318 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-12-02 16:50:37,318 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-12-02 16:50:37,318 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-12-02 16:50:37,318 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_6afdbd32-cc91-4e00-9d2e-7b370ed3243f/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6afdbd32-cc91-4e00-9d2e-7b370ed3243f/bin/utaipan-verify-nQ1chXbOIh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 898ef25fdb2ae04f56304d500631f410c196b9a77fbfba6f83248dcfc33b301f [2023-12-02 16:50:37,540 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-12-02 16:50:37,559 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-12-02 16:50:37,562 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-12-02 16:50:37,563 INFO L270 PluginConnector]: Initializing CDTParser... [2023-12-02 16:50:37,564 INFO L274 PluginConnector]: CDTParser initialized [2023-12-02 16:50:37,565 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6afdbd32-cc91-4e00-9d2e-7b370ed3243f/bin/utaipan-verify-nQ1chXbOIh/../../sv-benchmarks/c/loops-crafted-1/nested3-1_abstracted.c [2023-12-02 16:50:40,319 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-12-02 16:50:40,508 INFO L384 CDTParser]: Found 1 translation units. [2023-12-02 16:50:40,509 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6afdbd32-cc91-4e00-9d2e-7b370ed3243f/sv-benchmarks/c/loops-crafted-1/nested3-1_abstracted.c [2023-12-02 16:50:40,514 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6afdbd32-cc91-4e00-9d2e-7b370ed3243f/bin/utaipan-verify-nQ1chXbOIh/data/d6124b1c3/5bd05473d3444fb880325a42f1dfe2f7/FLAG0e37f7012 [2023-12-02 16:50:40,528 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6afdbd32-cc91-4e00-9d2e-7b370ed3243f/bin/utaipan-verify-nQ1chXbOIh/data/d6124b1c3/5bd05473d3444fb880325a42f1dfe2f7 [2023-12-02 16:50:40,531 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-12-02 16:50:40,532 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-12-02 16:50:40,533 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-12-02 16:50:40,533 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-12-02 16:50:40,539 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-12-02 16:50:40,540 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 04:50:40" (1/1) ... [2023-12-02 16:50:40,541 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4eb05b0f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:50:40, skipping insertion in model container [2023-12-02 16:50:40,541 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 04:50:40" (1/1) ... [2023-12-02 16:50:40,564 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-12-02 16:50:40,709 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_6afdbd32-cc91-4e00-9d2e-7b370ed3243f/sv-benchmarks/c/loops-crafted-1/nested3-1_abstracted.c[739,752] [2023-12-02 16:50:40,724 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 16:50:40,734 INFO L202 MainTranslator]: Completed pre-run [2023-12-02 16:50:40,747 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_6afdbd32-cc91-4e00-9d2e-7b370ed3243f/sv-benchmarks/c/loops-crafted-1/nested3-1_abstracted.c[739,752] [2023-12-02 16:50:40,752 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 16:50:40,766 INFO L206 MainTranslator]: Completed translation [2023-12-02 16:50:40,767 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:50:40 WrapperNode [2023-12-02 16:50:40,767 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-12-02 16:50:40,768 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-12-02 16:50:40,768 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-12-02 16:50:40,768 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-12-02 16:50:40,776 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:50:40" (1/1) ... [2023-12-02 16:50:40,783 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:50:40" (1/1) ... [2023-12-02 16:50:40,797 INFO L138 Inliner]: procedures = 20, calls = 10, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 46 [2023-12-02 16:50:40,797 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-12-02 16:50:40,797 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-12-02 16:50:40,797 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-12-02 16:50:40,798 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-12-02 16:50:40,804 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:50:40" (1/1) ... [2023-12-02 16:50:40,804 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:50:40" (1/1) ... [2023-12-02 16:50:40,805 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:50:40" (1/1) ... [2023-12-02 16:50:40,805 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:50:40" (1/1) ... [2023-12-02 16:50:40,808 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:50:40" (1/1) ... [2023-12-02 16:50:40,811 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:50:40" (1/1) ... [2023-12-02 16:50:40,812 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:50:40" (1/1) ... [2023-12-02 16:50:40,813 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:50:40" (1/1) ... [2023-12-02 16:50:40,815 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-12-02 16:50:40,816 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-12-02 16:50:40,816 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-12-02 16:50:40,816 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-12-02 16:50:40,816 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:50:40" (1/1) ... [2023-12-02 16:50:40,822 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 16:50:40,835 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6afdbd32-cc91-4e00-9d2e-7b370ed3243f/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:50:40,846 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6afdbd32-cc91-4e00-9d2e-7b370ed3243f/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-12-02 16:50:40,852 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6afdbd32-cc91-4e00-9d2e-7b370ed3243f/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-12-02 16:50:40,882 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-12-02 16:50:40,883 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-12-02 16:50:40,883 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-12-02 16:50:40,883 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-12-02 16:50:40,883 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-12-02 16:50:40,883 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-12-02 16:50:40,945 INFO L241 CfgBuilder]: Building ICFG [2023-12-02 16:50:40,946 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-12-02 16:50:41,079 INFO L282 CfgBuilder]: Performing block encoding [2023-12-02 16:50:41,137 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-12-02 16:50:41,138 INFO L309 CfgBuilder]: Removed 2 assume(true) statements. [2023-12-02 16:50:41,139 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 04:50:41 BoogieIcfgContainer [2023-12-02 16:50:41,140 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-12-02 16:50:41,142 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-12-02 16:50:41,143 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-12-02 16:50:41,146 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-12-02 16:50:41,146 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.12 04:50:40" (1/3) ... [2023-12-02 16:50:41,147 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@485b66c4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 04:50:41, skipping insertion in model container [2023-12-02 16:50:41,147 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:50:40" (2/3) ... [2023-12-02 16:50:41,148 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@485b66c4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 04:50:41, skipping insertion in model container [2023-12-02 16:50:41,148 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 04:50:41" (3/3) ... [2023-12-02 16:50:41,149 INFO L112 eAbstractionObserver]: Analyzing ICFG nested3-1_abstracted.c [2023-12-02 16:50:41,168 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-12-02 16:50:41,168 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-12-02 16:50:41,215 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-12-02 16:50:41,222 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;@1e9860, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-12-02 16:50:41,222 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-12-02 16:50:41,226 INFO L276 IsEmpty]: Start isEmpty. Operand has 16 states, 10 states have (on average 1.4) internal successors, (14), 11 states have internal predecessors, (14), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-12-02 16:50:41,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-12-02 16:50:41,234 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:50:41,235 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-12-02 16:50:41,235 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:50:41,241 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:50:41,241 INFO L85 PathProgramCache]: Analyzing trace with hash -1091749507, now seen corresponding path program 1 times [2023-12-02 16:50:41,251 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:50:41,251 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [377321583] [2023-12-02 16:50:41,251 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:50:41,252 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:50:41,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:50:41,438 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 16:50:41,438 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:50:41,439 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [377321583] [2023-12-02 16:50:41,439 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [377321583] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:50:41,439 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 16:50:41,440 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-12-02 16:50:41,441 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1034803160] [2023-12-02 16:50:41,442 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:50:41,446 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:50:41,446 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:50:41,472 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:50:41,472 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 16:50:41,474 INFO L87 Difference]: Start difference. First operand has 16 states, 10 states have (on average 1.4) internal successors, (14), 11 states have internal predecessors, (14), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 2 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:50:41,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:50:41,516 INFO L93 Difference]: Finished difference Result 37 states and 54 transitions. [2023-12-02 16:50:41,518 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:50:41,519 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 2 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2023-12-02 16:50:41,519 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:50:41,525 INFO L225 Difference]: With dead ends: 37 [2023-12-02 16:50:41,525 INFO L226 Difference]: Without dead ends: 20 [2023-12-02 16:50:41,528 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 16:50:41,532 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 4 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 16:50:41,533 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 24 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 16:50:41,547 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2023-12-02 16:50:41,560 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 15. [2023-12-02 16:50:41,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 10 states have (on average 1.3) internal successors, (13), 11 states have internal predecessors, (13), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-12-02 16:50:41,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 18 transitions. [2023-12-02 16:50:41,563 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 18 transitions. Word has length 6 [2023-12-02 16:50:41,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:50:41,564 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 18 transitions. [2023-12-02 16:50:41,564 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 2 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:50:41,564 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 18 transitions. [2023-12-02 16:50:41,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-12-02 16:50:41,566 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:50:41,567 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:50:41,567 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-12-02 16:50:41,567 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:50:41,568 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:50:41,568 INFO L85 PathProgramCache]: Analyzing trace with hash -1655309817, now seen corresponding path program 1 times [2023-12-02 16:50:41,568 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:50:41,569 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1948212071] [2023-12-02 16:50:41,569 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:50:41,569 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:50:41,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:50:41,659 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 16:50:41,659 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:50:41,659 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1948212071] [2023-12-02 16:50:41,660 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1948212071] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:50:41,660 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 16:50:41,660 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 16:50:41,660 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1218349303] [2023-12-02 16:50:41,661 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:50:41,662 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:50:41,662 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:50:41,663 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:50:41,663 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 16:50:41,664 INFO L87 Difference]: Start difference. First operand 15 states and 18 transitions. Second operand has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:50:41,687 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:50:41,687 INFO L93 Difference]: Finished difference Result 31 states and 39 transitions. [2023-12-02 16:50:41,687 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:50:41,688 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 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 16:50:41,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:50:41,689 INFO L225 Difference]: With dead ends: 31 [2023-12-02 16:50:41,689 INFO L226 Difference]: Without dead ends: 18 [2023-12-02 16:50:41,689 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 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 16:50:41,691 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 1 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 10 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 16:50:41,692 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 23 Invalid, 10 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 16:50:41,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2023-12-02 16:50:41,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 16. [2023-12-02 16:50:41,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 12 states have internal predecessors, (14), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-12-02 16:50:41,697 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 19 transitions. [2023-12-02 16:50:41,697 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 19 transitions. Word has length 7 [2023-12-02 16:50:41,697 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:50:41,698 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 19 transitions. [2023-12-02 16:50:41,698 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:50:41,698 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 19 transitions. [2023-12-02 16:50:41,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-12-02 16:50:41,698 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:50:41,699 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:50:41,699 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-12-02 16:50:41,699 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:50:41,700 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:50:41,700 INFO L85 PathProgramCache]: Analyzing trace with hash -1647057710, now seen corresponding path program 1 times [2023-12-02 16:50:41,700 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:50:41,700 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1690669999] [2023-12-02 16:50:41,700 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:50:41,700 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:50:41,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:50:41,859 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 16:50:41,859 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:50:41,859 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1690669999] [2023-12-02 16:50:41,859 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1690669999] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:50:41,860 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 16:50:41,860 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-12-02 16:50:41,860 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1861109585] [2023-12-02 16:50:41,860 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:50:41,860 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 16:50:41,861 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:50:41,861 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 16:50:41,861 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-12-02 16:50:41,862 INFO L87 Difference]: Start difference. First operand 16 states and 19 transitions. Second operand has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:50:41,915 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:50:41,916 INFO L93 Difference]: Finished difference Result 23 states and 25 transitions. [2023-12-02 16:50:41,916 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-12-02 16:50:41,916 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 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 16:50:41,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:50:41,917 INFO L225 Difference]: With dead ends: 23 [2023-12-02 16:50:41,917 INFO L226 Difference]: Without dead ends: 21 [2023-12-02 16:50:41,918 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-12-02 16:50:41,919 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 10 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 29 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 16:50:41,920 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 37 Invalid, 29 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 16:50:41,920 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2023-12-02 16:50:41,926 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 20. [2023-12-02 16:50:41,926 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 15 states have internal predecessors, (17), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-12-02 16:50:41,927 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2023-12-02 16:50:41,927 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 7 [2023-12-02 16:50:41,927 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:50:41,927 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2023-12-02 16:50:41,928 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 16:50:41,928 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2023-12-02 16:50:41,928 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-12-02 16:50:41,928 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:50:41,928 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:50:41,929 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-12-02 16:50:41,929 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:50:41,929 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:50:41,930 INFO L85 PathProgramCache]: Analyzing trace with hash -1577091667, now seen corresponding path program 1 times [2023-12-02 16:50:41,930 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:50:41,930 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [573827410] [2023-12-02 16:50:41,930 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:50:41,930 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:50:41,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:50:42,014 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 16:50:42,014 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:50:42,014 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [573827410] [2023-12-02 16:50:42,014 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [573827410] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:50:42,014 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1207846433] [2023-12-02 16:50:42,015 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:50:42,015 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:50:42,015 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6afdbd32-cc91-4e00-9d2e-7b370ed3243f/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:50:42,017 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6afdbd32-cc91-4e00-9d2e-7b370ed3243f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:50:42,023 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6afdbd32-cc91-4e00-9d2e-7b370ed3243f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-12-02 16:50:42,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:50:42,078 INFO L262 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 7 conjunts are in the unsatisfiable core [2023-12-02 16:50:42,081 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:50:42,136 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 16:50:42,137 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:50:42,194 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 16:50:42,194 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1207846433] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:50:42,194 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [630025915] [2023-12-02 16:50:42,210 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-12-02 16:50:42,210 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:50:42,213 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:50:42,218 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:50:42,219 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:50:42,996 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 83 for LOIs [2023-12-02 16:50:43,416 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:50:45,442 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '326#(and (exists ((|v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_9| Int) (|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_12| Int) (|v_ULTIMATE.start_main_~w~0#1_BEFORE_CALL_9| Int)) (and (<= 1 |#StackHeapBarrier|) (= (mod |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_12| 2) 0) (= |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_9| 0) (<= 1 |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_12|) (= |v_ULTIMATE.start_main_~w~0#1_BEFORE_CALL_9| 0) (<= 268435455 (mod |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_12| 4294967296)))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 16:50:45,442 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:50:45,443 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:50:45,443 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 6, 6] total 9 [2023-12-02 16:50:45,443 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [520504746] [2023-12-02 16:50:45,443 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:50:45,444 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-12-02 16:50:45,444 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:50:45,445 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-12-02 16:50:45,446 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=253, Unknown=0, NotChecked=0, Total=306 [2023-12-02 16:50:45,446 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 8 states have internal predecessors, (19), 5 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-12-02 16:50:45,567 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:50:45,568 INFO L93 Difference]: Finished difference Result 54 states and 65 transitions. [2023-12-02 16:50:45,568 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-12-02 16:50:45,568 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 8 states have internal predecessors, (19), 5 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 14 [2023-12-02 16:50:45,568 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:50:45,569 INFO L225 Difference]: With dead ends: 54 [2023-12-02 16:50:45,569 INFO L226 Difference]: Without dead ends: 36 [2023-12-02 16:50:45,570 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 27 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=58, Invalid=284, Unknown=0, NotChecked=0, Total=342 [2023-12-02 16:50:45,571 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 14 mSDsluCounter, 80 mSDsCounter, 0 mSdLazyCounter, 88 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 99 SdHoareTripleChecker+Invalid, 93 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 88 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:50:45,572 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 99 Invalid, 93 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 88 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:50:45,573 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2023-12-02 16:50:45,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 31. [2023-12-02 16:50:45,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 21 states have (on average 1.1904761904761905) internal successors, (25), 23 states have internal predecessors, (25), 6 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2023-12-02 16:50:45,582 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 36 transitions. [2023-12-02 16:50:45,582 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 36 transitions. Word has length 14 [2023-12-02 16:50:45,582 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:50:45,583 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 36 transitions. [2023-12-02 16:50:45,583 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 8 states have internal predecessors, (19), 5 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-12-02 16:50:45,583 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 36 transitions. [2023-12-02 16:50:45,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-12-02 16:50:45,584 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:50:45,584 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2023-12-02 16:50:45,594 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6afdbd32-cc91-4e00-9d2e-7b370ed3243f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-12-02 16:50:45,784 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6afdbd32-cc91-4e00-9d2e-7b370ed3243f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:50:45,785 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:50:45,785 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:50:45,785 INFO L85 PathProgramCache]: Analyzing trace with hash 1395635015, now seen corresponding path program 2 times [2023-12-02 16:50:45,785 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:50:45,785 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1721496994] [2023-12-02 16:50:45,786 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:50:45,786 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:50:45,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:50:45,885 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-12-02 16:50:45,886 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:50:45,886 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1721496994] [2023-12-02 16:50:45,886 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1721496994] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:50:45,886 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [830611529] [2023-12-02 16:50:45,886 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 16:50:45,887 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:50:45,887 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6afdbd32-cc91-4e00-9d2e-7b370ed3243f/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:50:45,889 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6afdbd32-cc91-4e00-9d2e-7b370ed3243f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:50:45,895 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6afdbd32-cc91-4e00-9d2e-7b370ed3243f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-12-02 16:50:45,954 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-12-02 16:50:45,954 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 16:50:45,956 INFO L262 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 13 conjunts are in the unsatisfiable core [2023-12-02 16:50:45,957 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:50:45,975 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-12-02 16:50:45,975 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:50:46,103 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-12-02 16:50:46,103 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [830611529] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:50:46,103 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2416916] [2023-12-02 16:50:46,105 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-12-02 16:50:46,106 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:50:46,106 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:50:46,106 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:50:46,106 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:50:46,572 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 83 for LOIs [2023-12-02 16:50:46,902 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:50:50,124 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '595#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (exists ((|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_27| Int) (|v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_19| Int) (|v_ULTIMATE.start_main_~w~0#1_BEFORE_CALL_19| Int)) (and (<= 268435455 (mod |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_27| 4294967296)) (<= 1 |#StackHeapBarrier|) (<= 1 |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_27|) (= |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_19| 0) (= (mod |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_27| 2) 0) (= |v_ULTIMATE.start_main_~w~0#1_BEFORE_CALL_19| 0))))' at error location [2023-12-02 16:50:50,124 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:50:50,124 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:50:50,124 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 8] total 12 [2023-12-02 16:50:50,125 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1934819310] [2023-12-02 16:50:50,125 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:50:50,125 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-12-02 16:50:50,125 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:50:50,126 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-12-02 16:50:50,126 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=343, Unknown=0, NotChecked=0, Total=420 [2023-12-02 16:50:50,127 INFO L87 Difference]: Start difference. First operand 31 states and 36 transitions. Second operand has 12 states, 11 states have (on average 2.090909090909091) internal successors, (23), 11 states have internal predecessors, (23), 6 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-12-02 16:50:50,322 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:50:50,322 INFO L93 Difference]: Finished difference Result 78 states and 97 transitions. [2023-12-02 16:50:50,322 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-12-02 16:50:50,323 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 2.090909090909091) internal successors, (23), 11 states have internal predecessors, (23), 6 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 21 [2023-12-02 16:50:50,323 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:50:50,325 INFO L225 Difference]: With dead ends: 78 [2023-12-02 16:50:50,325 INFO L226 Difference]: Without dead ends: 47 [2023-12-02 16:50:50,326 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 121 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=100, Invalid=452, Unknown=0, NotChecked=0, Total=552 [2023-12-02 16:50:50,326 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 16 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 99 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 99 SdHoareTripleChecker+Invalid, 109 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 99 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:50:50,327 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 99 Invalid, 109 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 99 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:50:50,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2023-12-02 16:50:50,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 28. [2023-12-02 16:50:50,335 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 20 states have (on average 1.1) internal successors, (22), 20 states have internal predecessors, (22), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-12-02 16:50:50,335 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 31 transitions. [2023-12-02 16:50:50,336 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 31 transitions. Word has length 21 [2023-12-02 16:50:50,336 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:50:50,336 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 31 transitions. [2023-12-02 16:50:50,336 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 2.090909090909091) internal successors, (23), 11 states have internal predecessors, (23), 6 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-12-02 16:50:50,336 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 31 transitions. [2023-12-02 16:50:50,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2023-12-02 16:50:50,337 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:50:50,338 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:50:50,343 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6afdbd32-cc91-4e00-9d2e-7b370ed3243f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-12-02 16:50:50,538 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6afdbd32-cc91-4e00-9d2e-7b370ed3243f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:50:50,538 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:50:50,539 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:50:50,539 INFO L85 PathProgramCache]: Analyzing trace with hash -1221652332, now seen corresponding path program 1 times [2023-12-02 16:50:50,539 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:50:50,539 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1452933067] [2023-12-02 16:50:50,539 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:50:50,539 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:50:50,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:50:50,638 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 9 proven. 12 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-12-02 16:50:50,639 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:50:50,639 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1452933067] [2023-12-02 16:50:50,639 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1452933067] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:50:50,639 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1404492064] [2023-12-02 16:50:50,639 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:50:50,639 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:50:50,640 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6afdbd32-cc91-4e00-9d2e-7b370ed3243f/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:50:50,640 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6afdbd32-cc91-4e00-9d2e-7b370ed3243f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:50:50,642 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6afdbd32-cc91-4e00-9d2e-7b370ed3243f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-12-02 16:50:50,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:50:50,685 INFO L262 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 10 conjunts are in the unsatisfiable core [2023-12-02 16:50:50,687 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:50:50,740 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 8 proven. 10 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2023-12-02 16:50:50,740 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:50:50,838 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 16 proven. 2 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2023-12-02 16:50:50,838 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1404492064] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:50:50,839 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1880336211] [2023-12-02 16:50:50,841 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 16:50:50,841 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:50:50,842 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:50:50,842 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:50:50,842 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:50:51,967 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2023-12-02 16:50:51,970 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:50:52,128 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '988#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 16:50:52,128 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:50:52,129 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:50:52,129 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 14 [2023-12-02 16:50:52,129 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [788528432] [2023-12-02 16:50:52,129 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:50:52,130 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-12-02 16:50:52,130 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:50:52,131 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-12-02 16:50:52,131 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=346, Unknown=0, NotChecked=0, Total=420 [2023-12-02 16:50:52,131 INFO L87 Difference]: Start difference. First operand 28 states and 31 transitions. Second operand has 14 states, 14 states have (on average 2.642857142857143) internal successors, (37), 14 states have internal predecessors, (37), 8 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 8 states have call predecessors, (10), 8 states have call successors, (10) [2023-12-02 16:50:52,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:50:52,532 INFO L93 Difference]: Finished difference Result 113 states and 149 transitions. [2023-12-02 16:50:52,533 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2023-12-02 16:50:52,533 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.642857142857143) internal successors, (37), 14 states have internal predecessors, (37), 8 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 8 states have call predecessors, (10), 8 states have call successors, (10) Word has length 35 [2023-12-02 16:50:52,533 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:50:52,534 INFO L225 Difference]: With dead ends: 113 [2023-12-02 16:50:52,534 INFO L226 Difference]: Without dead ends: 87 [2023-12-02 16:50:52,536 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 91 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 319 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=262, Invalid=1070, Unknown=0, NotChecked=0, Total=1332 [2023-12-02 16:50:52,536 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 42 mSDsluCounter, 88 mSDsCounter, 0 mSdLazyCounter, 150 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 110 SdHoareTripleChecker+Invalid, 176 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 150 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 16:50:52,537 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [46 Valid, 110 Invalid, 176 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 150 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 16:50:52,537 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2023-12-02 16:50:52,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 79. [2023-12-02 16:50:52,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 55 states have (on average 1.0909090909090908) internal successors, (60), 55 states have internal predecessors, (60), 21 states have call successors, (21), 3 states have call predecessors, (21), 2 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2023-12-02 16:50:52,560 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 101 transitions. [2023-12-02 16:50:52,560 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 101 transitions. Word has length 35 [2023-12-02 16:50:52,560 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:50:52,560 INFO L495 AbstractCegarLoop]: Abstraction has 79 states and 101 transitions. [2023-12-02 16:50:52,560 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.642857142857143) internal successors, (37), 14 states have internal predecessors, (37), 8 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 8 states have call predecessors, (10), 8 states have call successors, (10) [2023-12-02 16:50:52,560 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 101 transitions. [2023-12-02 16:50:52,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2023-12-02 16:50:52,566 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:50:52,566 INFO L195 NwaCegarLoop]: trace histogram [21, 20, 20, 16, 16, 16, 16, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1] [2023-12-02 16:50:52,571 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6afdbd32-cc91-4e00-9d2e-7b370ed3243f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-12-02 16:50:52,766 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6afdbd32-cc91-4e00-9d2e-7b370ed3243f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:50:52,767 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:50:52,767 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:50:52,767 INFO L85 PathProgramCache]: Analyzing trace with hash 1930047857, now seen corresponding path program 2 times [2023-12-02 16:50:52,767 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:50:52,767 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2000823050] [2023-12-02 16:50:52,768 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:50:52,768 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:50:52,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:50:53,136 INFO L134 CoverageAnalysis]: Checked inductivity of 1252 backedges. 215 proven. 22 refuted. 0 times theorem prover too weak. 1015 trivial. 0 not checked. [2023-12-02 16:50:53,136 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:50:53,137 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2000823050] [2023-12-02 16:50:53,137 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2000823050] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:50:53,137 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [807396292] [2023-12-02 16:50:53,137 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 16:50:53,137 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:50:53,137 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6afdbd32-cc91-4e00-9d2e-7b370ed3243f/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:50:53,138 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6afdbd32-cc91-4e00-9d2e-7b370ed3243f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:50:53,142 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6afdbd32-cc91-4e00-9d2e-7b370ed3243f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-12-02 16:50:53,454 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2023-12-02 16:50:53,454 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 16:50:53,456 INFO L262 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 14 conjunts are in the unsatisfiable core [2023-12-02 16:50:53,462 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:50:53,500 INFO L134 CoverageAnalysis]: Checked inductivity of 1252 backedges. 295 proven. 22 refuted. 0 times theorem prover too weak. 935 trivial. 0 not checked. [2023-12-02 16:50:53,500 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:50:53,727 INFO L134 CoverageAnalysis]: Checked inductivity of 1252 backedges. 221 proven. 22 refuted. 0 times theorem prover too weak. 1009 trivial. 0 not checked. [2023-12-02 16:50:53,727 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [807396292] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:50:53,727 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1816280736] [2023-12-02 16:50:53,729 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 16:50:53,729 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:50:53,730 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:50:53,730 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:50:53,730 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:50:54,846 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2023-12-02 16:50:54,849 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:50:55,010 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2242#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 16:50:55,011 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:50:55,011 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:50:55,011 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 8] total 14 [2023-12-02 16:50:55,011 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [340062583] [2023-12-02 16:50:55,011 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:50:55,013 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-12-02 16:50:55,013 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:50:55,013 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-12-02 16:50:55,014 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=325, Unknown=0, NotChecked=0, Total=420 [2023-12-02 16:50:55,014 INFO L87 Difference]: Start difference. First operand 79 states and 101 transitions. Second operand has 14 states, 14 states have (on average 3.0) internal successors, (42), 14 states have internal predecessors, (42), 10 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (13), 10 states have call predecessors, (13), 10 states have call successors, (13) [2023-12-02 16:50:55,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:50:55,676 INFO L93 Difference]: Finished difference Result 215 states and 302 transitions. [2023-12-02 16:50:55,677 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-12-02 16:50:55,677 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.0) internal successors, (42), 14 states have internal predecessors, (42), 10 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (13), 10 states have call predecessors, (13), 10 states have call successors, (13) Word has length 150 [2023-12-02 16:50:55,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:50:55,678 INFO L225 Difference]: With dead ends: 215 [2023-12-02 16:50:55,678 INFO L226 Difference]: Without dead ends: 151 [2023-12-02 16:50:55,679 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 462 GetRequests, 438 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 122 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=166, Invalid=484, Unknown=0, NotChecked=0, Total=650 [2023-12-02 16:50:55,680 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 16 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 104 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 94 SdHoareTripleChecker+Invalid, 127 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 104 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 16:50:55,680 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 94 Invalid, 127 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 104 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 16:50:55,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2023-12-02 16:50:55,733 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 151. [2023-12-02 16:50:55,734 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 151 states, 103 states have (on average 1.0485436893203883) internal successors, (108), 103 states have internal predecessors, (108), 45 states have call successors, (45), 3 states have call predecessors, (45), 2 states have return successors, (44), 44 states have call predecessors, (44), 44 states have call successors, (44) [2023-12-02 16:50:55,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 197 transitions. [2023-12-02 16:50:55,737 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 197 transitions. Word has length 150 [2023-12-02 16:50:55,737 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:50:55,737 INFO L495 AbstractCegarLoop]: Abstraction has 151 states and 197 transitions. [2023-12-02 16:50:55,738 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 3.0) internal successors, (42), 14 states have internal predecessors, (42), 10 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (13), 10 states have call predecessors, (13), 10 states have call successors, (13) [2023-12-02 16:50:55,738 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 197 transitions. [2023-12-02 16:50:55,745 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 319 [2023-12-02 16:50:55,745 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:50:55,745 INFO L195 NwaCegarLoop]: trace histogram [45, 44, 44, 40, 40, 40, 40, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1] [2023-12-02 16:50:55,750 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6afdbd32-cc91-4e00-9d2e-7b370ed3243f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-12-02 16:50:55,945 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6afdbd32-cc91-4e00-9d2e-7b370ed3243f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:50:55,946 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:50:55,946 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:50:55,946 INFO L85 PathProgramCache]: Analyzing trace with hash -1373710095, now seen corresponding path program 3 times [2023-12-02 16:50:55,946 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:50:55,946 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [485314534] [2023-12-02 16:50:55,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:50:55,947 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:50:56,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:50:56,629 INFO L134 CoverageAnalysis]: Checked inductivity of 6400 backedges. 1055 proven. 145 refuted. 0 times theorem prover too weak. 5200 trivial. 0 not checked. [2023-12-02 16:50:56,629 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:50:56,629 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [485314534] [2023-12-02 16:50:56,629 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [485314534] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:50:56,629 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1185878840] [2023-12-02 16:50:56,630 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 16:50:56,630 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:50:56,630 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6afdbd32-cc91-4e00-9d2e-7b370ed3243f/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:50:56,631 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6afdbd32-cc91-4e00-9d2e-7b370ed3243f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:50:56,638 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6afdbd32-cc91-4e00-9d2e-7b370ed3243f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-12-02 16:50:56,812 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 16:50:56,813 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 16:50:56,815 INFO L262 TraceCheckSpWp]: Trace formula consists of 699 conjuncts, 22 conjunts are in the unsatisfiable core [2023-12-02 16:50:56,824 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:50:57,101 INFO L134 CoverageAnalysis]: Checked inductivity of 6400 backedges. 88 proven. 2048 refuted. 0 times theorem prover too weak. 4264 trivial. 0 not checked. [2023-12-02 16:50:57,101 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:50:57,688 INFO L134 CoverageAnalysis]: Checked inductivity of 6400 backedges. 166 proven. 1970 refuted. 0 times theorem prover too weak. 4264 trivial. 0 not checked. [2023-12-02 16:50:57,688 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1185878840] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:50:57,688 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1214832584] [2023-12-02 16:50:57,691 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 16:50:57,691 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:50:57,691 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:50:57,691 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:50:57,691 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:50:58,648 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2023-12-02 16:50:58,651 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:50:58,901 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4794#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 16:50:58,901 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:50:58,901 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:50:58,902 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 33 [2023-12-02 16:50:58,902 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1782704925] [2023-12-02 16:50:58,902 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:50:58,903 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2023-12-02 16:50:58,903 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:50:58,904 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2023-12-02 16:50:58,905 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=215, Invalid=1345, Unknown=0, NotChecked=0, Total=1560 [2023-12-02 16:50:58,906 INFO L87 Difference]: Start difference. First operand 151 states and 197 transitions. Second operand has 33 states, 33 states have (on average 2.9393939393939394) internal successors, (97), 33 states have internal predecessors, (97), 27 states have call successors, (37), 2 states have call predecessors, (37), 1 states have return successors, (36), 27 states have call predecessors, (36), 27 states have call successors, (36) [2023-12-02 16:51:07,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:51:07,065 INFO L93 Difference]: Finished difference Result 523 states and 712 transitions. [2023-12-02 16:51:07,065 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 126 states. [2023-12-02 16:51:07,066 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 2.9393939393939394) internal successors, (97), 33 states have internal predecessors, (97), 27 states have call successors, (37), 2 states have call predecessors, (37), 1 states have return successors, (36), 27 states have call predecessors, (36), 27 states have call successors, (36) Word has length 318 [2023-12-02 16:51:07,066 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:51:07,070 INFO L225 Difference]: With dead ends: 523 [2023-12-02 16:51:07,070 INFO L226 Difference]: Without dead ends: 405 [2023-12-02 16:51:07,084 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1079 GetRequests, 928 SyntacticMatches, 0 SemanticMatches, 151 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8127 ImplicationChecksByTransitivity, 7.2s TimeCoverageRelationStatistics Valid=2935, Invalid=20321, Unknown=0, NotChecked=0, Total=23256 [2023-12-02 16:51:07,085 INFO L413 NwaCegarLoop]: 116 mSDtfsCounter, 173 mSDsluCounter, 884 mSDsCounter, 0 mSdLazyCounter, 2645 mSolverCounterSat, 99 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 177 SdHoareTripleChecker+Valid, 1000 SdHoareTripleChecker+Invalid, 2744 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 99 IncrementalHoareTripleChecker+Valid, 2645 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2023-12-02 16:51:07,085 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [177 Valid, 1000 Invalid, 2744 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [99 Valid, 2645 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2023-12-02 16:51:07,086 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 405 states. [2023-12-02 16:51:07,198 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 405 to 385. [2023-12-02 16:51:07,199 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 385 states, 261 states have (on average 1.0421455938697317) internal successors, (272), 261 states have internal predecessors, (272), 121 states have call successors, (121), 3 states have call predecessors, (121), 2 states have return successors, (120), 120 states have call predecessors, (120), 120 states have call successors, (120) [2023-12-02 16:51:07,204 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 385 states to 385 states and 513 transitions. [2023-12-02 16:51:07,204 INFO L78 Accepts]: Start accepts. Automaton has 385 states and 513 transitions. Word has length 318 [2023-12-02 16:51:07,205 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:51:07,205 INFO L495 AbstractCegarLoop]: Abstraction has 385 states and 513 transitions. [2023-12-02 16:51:07,205 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 2.9393939393939394) internal successors, (97), 33 states have internal predecessors, (97), 27 states have call successors, (37), 2 states have call predecessors, (37), 1 states have return successors, (36), 27 states have call predecessors, (36), 27 states have call successors, (36) [2023-12-02 16:51:07,205 INFO L276 IsEmpty]: Start isEmpty. Operand 385 states and 513 transitions. [2023-12-02 16:51:07,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 857 [2023-12-02 16:51:07,232 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:51:07,233 INFO L195 NwaCegarLoop]: trace histogram [121, 120, 120, 110, 110, 110, 110, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1] [2023-12-02 16:51:07,238 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6afdbd32-cc91-4e00-9d2e-7b370ed3243f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-12-02 16:51:07,434 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6afdbd32-cc91-4e00-9d2e-7b370ed3243f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:51:07,435 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:51:07,435 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:51:07,435 INFO L85 PathProgramCache]: Analyzing trace with hash 553580381, now seen corresponding path program 4 times [2023-12-02 16:51:07,435 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:51:07,435 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [963166705] [2023-12-02 16:51:07,435 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:51:07,436 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:51:08,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:51:09,610 INFO L134 CoverageAnalysis]: Checked inductivity of 48075 backedges. 3724 proven. 176 refuted. 0 times theorem prover too weak. 44175 trivial. 0 not checked. [2023-12-02 16:51:09,610 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:51:09,610 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [963166705] [2023-12-02 16:51:09,611 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [963166705] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:51:09,611 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [596280445] [2023-12-02 16:51:09,611 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 16:51:09,611 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:51:09,611 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6afdbd32-cc91-4e00-9d2e-7b370ed3243f/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:51:09,612 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6afdbd32-cc91-4e00-9d2e-7b370ed3243f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:51:09,615 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6afdbd32-cc91-4e00-9d2e-7b370ed3243f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-12-02 16:51:10,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:51:10,044 INFO L262 TraceCheckSpWp]: Trace formula consists of 1839 conjuncts, 46 conjunts are in the unsatisfiable core [2023-12-02 16:51:10,060 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:51:10,868 INFO L134 CoverageAnalysis]: Checked inductivity of 48075 backedges. 240 proven. 17691 refuted. 0 times theorem prover too weak. 30144 trivial. 0 not checked. [2023-12-02 16:51:10,869 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:51:12,495 INFO L134 CoverageAnalysis]: Checked inductivity of 48075 backedges. 271 proven. 17660 refuted. 0 times theorem prover too weak. 30144 trivial. 0 not checked. [2023-12-02 16:51:12,495 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [596280445] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:51:12,495 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1887799462] [2023-12-02 16:51:12,497 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 16:51:12,498 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:51:12,498 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:51:12,498 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:51:12,498 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:51:13,402 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2023-12-02 16:51:13,404 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:51:13,768 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11718#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 16:51:13,768 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:51:13,768 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:51:13,769 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 24, 24] total 58 [2023-12-02 16:51:13,769 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [668720745] [2023-12-02 16:51:13,769 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:51:13,771 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2023-12-02 16:51:13,771 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:51:13,773 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2023-12-02 16:51:13,774 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=674, Invalid=3486, Unknown=0, NotChecked=0, Total=4160 [2023-12-02 16:51:13,774 INFO L87 Difference]: Start difference. First operand 385 states and 513 transitions. Second operand has 58 states, 58 states have (on average 3.1206896551724137) internal successors, (181), 58 states have internal predecessors, (181), 52 states have call successors, (74), 2 states have call predecessors, (74), 1 states have return successors, (73), 52 states have call predecessors, (73), 52 states have call successors, (73) [2023-12-02 16:54:30,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:54:30,892 INFO L93 Difference]: Finished difference Result 1288 states and 1766 transitions. [2023-12-02 16:54:30,892 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 298 states. [2023-12-02 16:54:30,893 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 3.1206896551724137) internal successors, (181), 58 states have internal predecessors, (181), 52 states have call successors, (74), 2 states have call predecessors, (74), 1 states have return successors, (73), 52 states have call predecessors, (73), 52 states have call successors, (73) Word has length 856 [2023-12-02 16:54:30,893 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:54:30,901 INFO L225 Difference]: With dead ends: 1288 [2023-12-02 16:54:30,901 INFO L226 Difference]: Without dead ends: 939 [2023-12-02 16:54:30,921 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2854 GetRequests, 2518 SyntacticMatches, 0 SemanticMatches, 336 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45381 ImplicationChecksByTransitivity, 193.9s TimeCoverageRelationStatistics Valid=13625, Invalid=100278, Unknown=3, NotChecked=0, Total=113906 [2023-12-02 16:54:30,922 INFO L413 NwaCegarLoop]: 270 mSDtfsCounter, 399 mSDsluCounter, 3207 mSDsCounter, 0 mSdLazyCounter, 9383 mSolverCounterSat, 231 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 403 SdHoareTripleChecker+Valid, 3477 SdHoareTripleChecker+Invalid, 9614 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 231 IncrementalHoareTripleChecker+Valid, 9383 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.2s IncrementalHoareTripleChecker+Time [2023-12-02 16:54:30,922 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [403 Valid, 3477 Invalid, 9614 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [231 Valid, 9383 Invalid, 0 Unknown, 0 Unchecked, 4.2s Time] [2023-12-02 16:54:30,923 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 939 states. [2023-12-02 16:54:31,185 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 939 to 895. [2023-12-02 16:54:31,187 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 895 states, 605 states have (on average 1.0380165289256198) internal successors, (628), 605 states have internal predecessors, (628), 287 states have call successors, (287), 3 states have call predecessors, (287), 2 states have return successors, (286), 286 states have call predecessors, (286), 286 states have call successors, (286) [2023-12-02 16:54:31,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 895 states to 895 states and 1201 transitions. [2023-12-02 16:54:31,195 INFO L78 Accepts]: Start accepts. Automaton has 895 states and 1201 transitions. Word has length 856 [2023-12-02 16:54:31,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:54:31,196 INFO L495 AbstractCegarLoop]: Abstraction has 895 states and 1201 transitions. [2023-12-02 16:54:31,197 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 58 states have (on average 3.1206896551724137) internal successors, (181), 58 states have internal predecessors, (181), 52 states have call successors, (74), 2 states have call predecessors, (74), 1 states have return successors, (73), 52 states have call predecessors, (73), 52 states have call successors, (73) [2023-12-02 16:54:31,197 INFO L276 IsEmpty]: Start isEmpty. Operand 895 states and 1201 transitions. [2023-12-02 16:54:31,230 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2031 [2023-12-02 16:54:31,230 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:54:31,231 INFO L195 NwaCegarLoop]: trace histogram [287, 286, 286, 264, 264, 264, 264, 22, 22, 22, 22, 22, 1, 1, 1, 1, 1] [2023-12-02 16:54:31,238 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6afdbd32-cc91-4e00-9d2e-7b370ed3243f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-12-02 16:54:31,431 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6afdbd32-cc91-4e00-9d2e-7b370ed3243f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:54:31,432 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:54:31,432 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:54:31,432 INFO L85 PathProgramCache]: Analyzing trace with hash -1397013701, now seen corresponding path program 5 times [2023-12-02 16:54:31,433 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:54:31,433 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [711236461] [2023-12-02 16:54:31,433 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:54:31,433 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:54:33,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:54:37,042 INFO L134 CoverageAnalysis]: Checked inductivity of 274494 backedges. 10191 proven. 210 refuted. 0 times theorem prover too weak. 264093 trivial. 0 not checked. [2023-12-02 16:54:37,043 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:54:37,043 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [711236461] [2023-12-02 16:54:37,043 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [711236461] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:54:37,043 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1819210166] [2023-12-02 16:54:37,043 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 16:54:37,043 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:54:37,043 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6afdbd32-cc91-4e00-9d2e-7b370ed3243f/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:54:37,044 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6afdbd32-cc91-4e00-9d2e-7b370ed3243f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:54:37,044 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6afdbd32-cc91-4e00-9d2e-7b370ed3243f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-12-02 16:54:48,530 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2023-12-02 16:54:48,530 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 16:54:48,543 INFO L262 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 33 conjunts are in the unsatisfiable core [2023-12-02 16:54:48,567 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:54:48,690 INFO L134 CoverageAnalysis]: Checked inductivity of 274494 backedges. 11088 proven. 210 refuted. 0 times theorem prover too weak. 263196 trivial. 0 not checked. [2023-12-02 16:54:48,690 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:54:50,106 INFO L134 CoverageAnalysis]: Checked inductivity of 274494 backedges. 11124 proven. 174 refuted. 0 times theorem prover too weak. 263196 trivial. 0 not checked. [2023-12-02 16:54:50,107 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1819210166] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:54:50,107 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [432224584] [2023-12-02 16:54:50,109 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 16:54:50,109 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:54:50,110 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:54:50,110 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:54:50,110 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:54:50,989 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2023-12-02 16:54:50,992 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:54:51,287 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '28112#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 16:54:51,287 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:54:51,287 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:54:51,289 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 17, 18] total 33 [2023-12-02 16:54:51,289 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1265525404] [2023-12-02 16:54:51,289 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:54:51,292 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2023-12-02 16:54:51,292 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:54:51,292 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2023-12-02 16:54:51,293 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=220, Invalid=1262, Unknown=0, NotChecked=0, Total=1482 [2023-12-02 16:54:51,293 INFO L87 Difference]: Start difference. First operand 895 states and 1201 transitions. Second operand has 33 states, 33 states have (on average 2.3333333333333335) internal successors, (77), 33 states have internal predecessors, (77), 27 states have call successors, (31), 2 states have call predecessors, (31), 2 states have return successors, (30), 26 states have call predecessors, (30), 27 states have call successors, (30) [2023-12-02 16:54:52,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:54:52,019 INFO L93 Difference]: Finished difference Result 1951 states and 2682 transitions. [2023-12-02 16:54:52,020 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2023-12-02 16:54:52,020 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 2.3333333333333335) internal successors, (77), 33 states have internal predecessors, (77), 27 states have call successors, (31), 2 states have call predecessors, (31), 2 states have return successors, (30), 26 states have call predecessors, (30), 27 states have call successors, (30) Word has length 2030 [2023-12-02 16:54:52,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:54:52,027 INFO L225 Difference]: With dead ends: 1951 [2023-12-02 16:54:52,027 INFO L226 Difference]: Without dead ends: 1071 [2023-12-02 16:54:52,030 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6108 GetRequests, 6068 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=242, Invalid=1398, Unknown=0, NotChecked=0, Total=1640 [2023-12-02 16:54:52,030 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 18 mSDsluCounter, 190 mSDsCounter, 0 mSdLazyCounter, 665 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 212 SdHoareTripleChecker+Invalid, 678 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 665 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 16:54:52,031 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 212 Invalid, 678 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 665 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 16:54:52,033 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1071 states. [2023-12-02 16:54:52,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1071 to 961. [2023-12-02 16:54:52,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 961 states, 649 states have (on average 1.0354391371340523) internal successors, (672), 649 states have internal predecessors, (672), 309 states have call successors, (309), 3 states have call predecessors, (309), 2 states have return successors, (308), 308 states have call predecessors, (308), 308 states have call successors, (308) [2023-12-02 16:54:52,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 961 states to 961 states and 1289 transitions. [2023-12-02 16:54:52,275 INFO L78 Accepts]: Start accepts. Automaton has 961 states and 1289 transitions. Word has length 2030 [2023-12-02 16:54:52,276 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:54:52,276 INFO L495 AbstractCegarLoop]: Abstraction has 961 states and 1289 transitions. [2023-12-02 16:54:52,276 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 2.3333333333333335) internal successors, (77), 33 states have internal predecessors, (77), 27 states have call successors, (31), 2 states have call predecessors, (31), 2 states have return successors, (30), 26 states have call predecessors, (30), 27 states have call successors, (30) [2023-12-02 16:54:52,276 INFO L276 IsEmpty]: Start isEmpty. Operand 961 states and 1289 transitions. [2023-12-02 16:54:52,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2185 [2023-12-02 16:54:52,307 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:54:52,308 INFO L195 NwaCegarLoop]: trace histogram [309, 308, 308, 286, 286, 286, 286, 22, 22, 22, 22, 22, 1, 1, 1, 1, 1] [2023-12-02 16:54:52,315 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6afdbd32-cc91-4e00-9d2e-7b370ed3243f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2023-12-02 16:54:52,509 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6afdbd32-cc91-4e00-9d2e-7b370ed3243f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:54:52,509 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:54:52,509 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:54:52,510 INFO L85 PathProgramCache]: Analyzing trace with hash -606029731, now seen corresponding path program 6 times [2023-12-02 16:54:52,510 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:54:52,510 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [103956054] [2023-12-02 16:54:52,510 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:54:52,510 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:54:54,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:54:58,549 INFO L134 CoverageAnalysis]: Checked inductivity of 319231 backedges. 11852 proven. 247 refuted. 0 times theorem prover too weak. 307132 trivial. 0 not checked. [2023-12-02 16:54:58,549 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:54:58,549 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [103956054] [2023-12-02 16:54:58,550 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [103956054] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:54:58,550 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2141757860] [2023-12-02 16:54:58,550 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 16:54:58,550 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:54:58,550 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6afdbd32-cc91-4e00-9d2e-7b370ed3243f/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:54:58,551 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6afdbd32-cc91-4e00-9d2e-7b370ed3243f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:54:58,553 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6afdbd32-cc91-4e00-9d2e-7b370ed3243f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-12-02 16:54:59,546 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 16:54:59,546 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 16:54:59,569 INFO L262 TraceCheckSpWp]: Trace formula consists of 4659 conjuncts, 58 conjunts are in the unsatisfiable core [2023-12-02 16:54:59,600 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:55:00,033 INFO L134 CoverageAnalysis]: Checked inductivity of 319231 backedges. 51846 proven. 782 refuted. 0 times theorem prover too weak. 266603 trivial. 0 not checked. [2023-12-02 16:55:00,033 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:55:02,527 INFO L134 CoverageAnalysis]: Checked inductivity of 319231 backedges. 69910 proven. 35689 refuted. 0 times theorem prover too weak. 213632 trivial. 0 not checked. [2023-12-02 16:55:02,527 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2141757860] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:55:02,527 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1176345622] [2023-12-02 16:55:02,530 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 16:55:02,530 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:55:02,531 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:55:02,531 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:55:02,531 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:55:03,560 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2023-12-02 16:55:03,562 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:55:04,032 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '46141#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 16:55:04,032 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:55:04,032 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:55:04,034 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 18, 29] total 59 [2023-12-02 16:55:04,034 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1577378958] [2023-12-02 16:55:04,034 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:55:04,038 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2023-12-02 16:55:04,038 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:55:04,040 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2023-12-02 16:55:04,040 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=596, Invalid=3694, Unknown=0, NotChecked=0, Total=4290 [2023-12-02 16:55:04,041 INFO L87 Difference]: Start difference. First operand 961 states and 1289 transitions. Second operand has 59 states, 59 states have (on average 2.830508474576271) internal successors, (167), 59 states have internal predecessors, (167), 54 states have call successors, (71), 2 states have call predecessors, (71), 2 states have return successors, (70), 54 states have call predecessors, (70), 54 states have call successors, (70) [2023-12-02 17:00:39,639 WARN L854 $PredicateComparison]: unable to prove that (and (= |c_ULTIMATE.start_main_~y~0#1| 2) (< 268435454 (mod (+ |c_ULTIMATE.start_main_~x~0#1| 2) 4294967296)) (< 268435454 (mod (+ |c_ULTIMATE.start_main_~x~0#1| 10) 4294967296)) (< 268435454 (mod (+ 7 |c_ULTIMATE.start_main_~x~0#1|) 4294967296)) (< 268435454 (mod (+ |c_ULTIMATE.start_main_~x~0#1| 6) 4294967296)) (< 268435454 (mod (+ |c_ULTIMATE.start_main_~x~0#1| 1) 4294967296)) (< 268435454 (mod (+ |c_ULTIMATE.start_main_~x~0#1| 11) 4294967296)) (< 268435454 (mod (+ |c_ULTIMATE.start_main_~x~0#1| 9) 4294967296)) (< 268435454 (mod (+ |c_ULTIMATE.start_main_~x~0#1| 4) 4294967296)) (< 268435454 (mod (+ |c_ULTIMATE.start_main_~x~0#1| 8) 4294967296)) (< 268435454 (mod (+ |c_ULTIMATE.start_main_~x~0#1| 3) 4294967296)) (< 268435454 (mod (+ |c_ULTIMATE.start_main_~x~0#1| 12) 4294967296)) (< 268435454 (mod (+ |c_ULTIMATE.start_main_~x~0#1| 5) 4294967296))) is different from false [2023-12-02 17:01:30,451 WARN L293 SmtUtils]: Spent 6.07s on a formula simplification. DAG size of input: 110 DAG size of output: 26 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 17:02:17,842 WARN L293 SmtUtils]: Spent 5.22s on a formula simplification. DAG size of input: 101 DAG size of output: 25 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 17:03:18,405 WARN L293 SmtUtils]: Spent 7.46s on a formula simplification. DAG size of input: 93 DAG size of output: 26 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate)