./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-crafted/zero_sum_m4.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 0e0057cc Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/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_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-crafted/zero_sum_m4.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/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_13a6f15d-2bdd-4d82-b869-f66b96580b10/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 9b7320b0b08ab747958954e3beeb769f7a9cf6ae7994b9d20ef1bd1e033aa0a7 --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-12-02 14:50:04,162 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-12-02 14:50:04,235 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-12-02 14:50:04,242 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-12-02 14:50:04,242 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-12-02 14:50:04,272 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-12-02 14:50:04,272 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-12-02 14:50:04,273 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-12-02 14:50:04,274 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-12-02 14:50:04,274 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-12-02 14:50:04,275 INFO L153 SettingsManager]: * User list type=DISABLED [2023-12-02 14:50:04,276 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-12-02 14:50:04,276 INFO L153 SettingsManager]: * Explicit value domain=true [2023-12-02 14:50:04,277 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-12-02 14:50:04,277 INFO L153 SettingsManager]: * Octagon Domain=false [2023-12-02 14:50:04,278 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-12-02 14:50:04,278 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-12-02 14:50:04,279 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-12-02 14:50:04,279 INFO L153 SettingsManager]: * Interval Domain=false [2023-12-02 14:50:04,280 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-12-02 14:50:04,280 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-12-02 14:50:04,281 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-12-02 14:50:04,282 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-12-02 14:50:04,282 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-12-02 14:50:04,283 INFO L153 SettingsManager]: * sizeof long=4 [2023-12-02 14:50:04,283 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-12-02 14:50:04,284 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-12-02 14:50:04,284 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-12-02 14:50:04,285 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-12-02 14:50:04,285 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-12-02 14:50:04,286 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-12-02 14:50:04,287 INFO L153 SettingsManager]: * sizeof long double=12 [2023-12-02 14:50:04,287 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-12-02 14:50:04,287 INFO L153 SettingsManager]: * Use constant arrays=true [2023-12-02 14:50:04,288 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-12-02 14:50:04,288 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-12-02 14:50:04,289 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-12-02 14:50:04,289 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 14:50:04,290 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-12-02 14:50:04,290 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-12-02 14:50:04,291 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-12-02 14:50:04,291 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-12-02 14:50:04,291 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-12-02 14:50:04,292 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-12-02 14:50:04,292 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-12-02 14:50:04,292 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-12-02 14:50:04,292 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-12-02 14:50:04,293 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_13a6f15d-2bdd-4d82-b869-f66b96580b10/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 9b7320b0b08ab747958954e3beeb769f7a9cf6ae7994b9d20ef1bd1e033aa0a7 [2023-12-02 14:50:04,555 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-12-02 14:50:04,581 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-12-02 14:50:04,584 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-12-02 14:50:04,585 INFO L270 PluginConnector]: Initializing CDTParser... [2023-12-02 14:50:04,586 INFO L274 PluginConnector]: CDTParser initialized [2023-12-02 14:50:04,587 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/../../sv-benchmarks/c/array-crafted/zero_sum_m4.c [2023-12-02 14:50:07,515 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-12-02 14:50:07,685 INFO L384 CDTParser]: Found 1 translation units. [2023-12-02 14:50:07,686 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/sv-benchmarks/c/array-crafted/zero_sum_m4.c [2023-12-02 14:50:07,694 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/data/967d964a6/ade437162a0048a9bcd081e21b5d0877/FLAGe50c30b87 [2023-12-02 14:50:07,709 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/data/967d964a6/ade437162a0048a9bcd081e21b5d0877 [2023-12-02 14:50:07,712 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-12-02 14:50:07,713 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-12-02 14:50:07,715 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-12-02 14:50:07,715 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-12-02 14:50:07,721 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-12-02 14:50:07,722 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 02:50:07" (1/1) ... [2023-12-02 14:50:07,724 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@713e8fe4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:50:07, skipping insertion in model container [2023-12-02 14:50:07,724 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 02:50:07" (1/1) ... [2023-12-02 14:50:07,752 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-12-02 14:50:07,917 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_13a6f15d-2bdd-4d82-b869-f66b96580b10/sv-benchmarks/c/array-crafted/zero_sum_m4.c[402,415] [2023-12-02 14:50:07,941 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 14:50:07,952 INFO L202 MainTranslator]: Completed pre-run [2023-12-02 14:50:07,966 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_13a6f15d-2bdd-4d82-b869-f66b96580b10/sv-benchmarks/c/array-crafted/zero_sum_m4.c[402,415] [2023-12-02 14:50:07,979 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 14:50:07,997 INFO L206 MainTranslator]: Completed translation [2023-12-02 14:50:07,998 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:50:07 WrapperNode [2023-12-02 14:50:07,998 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-12-02 14:50:07,999 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-12-02 14:50:07,999 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-12-02 14:50:07,999 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-12-02 14:50:08,008 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:50:07" (1/1) ... [2023-12-02 14:50:08,016 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:50:07" (1/1) ... [2023-12-02 14:50:08,041 INFO L138 Inliner]: procedures = 15, calls = 19, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 130 [2023-12-02 14:50:08,042 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-12-02 14:50:08,043 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-12-02 14:50:08,043 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-12-02 14:50:08,043 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-12-02 14:50:08,053 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:50:07" (1/1) ... [2023-12-02 14:50:08,053 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:50:07" (1/1) ... [2023-12-02 14:50:08,056 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:50:07" (1/1) ... [2023-12-02 14:50:08,056 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:50:07" (1/1) ... [2023-12-02 14:50:08,063 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:50:07" (1/1) ... [2023-12-02 14:50:08,069 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:50:07" (1/1) ... [2023-12-02 14:50:08,071 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:50:07" (1/1) ... [2023-12-02 14:50:08,072 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:50:07" (1/1) ... [2023-12-02 14:50:08,075 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-12-02 14:50:08,076 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-12-02 14:50:08,076 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-12-02 14:50:08,077 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-12-02 14:50:08,078 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:50:07" (1/1) ... [2023-12-02 14:50:08,085 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 14:50:08,098 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:50:08,110 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-12-02 14:50:08,113 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-12-02 14:50:08,143 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-12-02 14:50:08,143 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-12-02 14:50:08,143 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-12-02 14:50:08,144 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-12-02 14:50:08,144 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-12-02 14:50:08,144 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-12-02 14:50:08,144 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-12-02 14:50:08,144 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-12-02 14:50:08,219 INFO L241 CfgBuilder]: Building ICFG [2023-12-02 14:50:08,221 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-12-02 14:50:08,433 INFO L282 CfgBuilder]: Performing block encoding [2023-12-02 14:50:08,505 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-12-02 14:50:08,506 INFO L309 CfgBuilder]: Removed 9 assume(true) statements. [2023-12-02 14:50:08,508 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 02:50:08 BoogieIcfgContainer [2023-12-02 14:50:08,508 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-12-02 14:50:08,511 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-12-02 14:50:08,511 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-12-02 14:50:08,515 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-12-02 14:50:08,515 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.12 02:50:07" (1/3) ... [2023-12-02 14:50:08,516 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6e9cdcf2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 02:50:08, skipping insertion in model container [2023-12-02 14:50:08,516 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:50:07" (2/3) ... [2023-12-02 14:50:08,517 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6e9cdcf2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 02:50:08, skipping insertion in model container [2023-12-02 14:50:08,517 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 02:50:08" (3/3) ... [2023-12-02 14:50:08,518 INFO L112 eAbstractionObserver]: Analyzing ICFG zero_sum_m4.c [2023-12-02 14:50:08,540 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-12-02 14:50:08,541 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-12-02 14:50:08,598 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-12-02 14:50:08,606 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;@1268bf1, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-12-02 14:50:08,607 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-12-02 14:50:08,611 INFO L276 IsEmpty]: Start isEmpty. Operand has 17 states, 15 states have (on average 1.8) internal successors, (27), 16 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:50:08,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-12-02 14:50:08,618 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:50:08,618 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:50:08,619 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:50:08,625 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:50:08,625 INFO L85 PathProgramCache]: Analyzing trace with hash -1453537585, now seen corresponding path program 1 times [2023-12-02 14:50:08,638 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:50:08,638 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [76703942] [2023-12-02 14:50:08,638 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:50:08,639 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:50:08,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:50:08,913 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 14:50:08,914 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:50:08,915 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [76703942] [2023-12-02 14:50:08,915 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [76703942] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:50:08,916 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 14:50:08,916 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 14:50:08,918 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1188896788] [2023-12-02 14:50:08,919 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:50:08,923 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 14:50:08,924 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:50:08,972 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 14:50:08,972 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 14:50:08,975 INFO L87 Difference]: Start difference. First operand has 17 states, 15 states have (on average 1.8) internal successors, (27), 16 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:50:09,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:50:09,047 INFO L93 Difference]: Finished difference Result 32 states and 51 transitions. [2023-12-02 14:50:09,048 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 14:50:09,049 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2023-12-02 14:50:09,050 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:50:09,057 INFO L225 Difference]: With dead ends: 32 [2023-12-02 14:50:09,057 INFO L226 Difference]: Without dead ends: 15 [2023-12-02 14:50:09,060 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 14:50:09,064 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 0 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 14:50:09,065 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 10 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 14:50:09,079 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2023-12-02 14:50:09,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2023-12-02 14:50:09,093 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.6428571428571428) internal successors, (23), 14 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:50:09,094 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 23 transitions. [2023-12-02 14:50:09,095 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 23 transitions. Word has length 13 [2023-12-02 14:50:09,095 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:50:09,095 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 23 transitions. [2023-12-02 14:50:09,096 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:50:09,096 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 23 transitions. [2023-12-02 14:50:09,096 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-12-02 14:50:09,097 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:50:09,097 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:50:09,097 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-12-02 14:50:09,097 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:50:09,098 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:50:09,098 INFO L85 PathProgramCache]: Analyzing trace with hash -1968564474, now seen corresponding path program 1 times [2023-12-02 14:50:09,098 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:50:09,099 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [306858208] [2023-12-02 14:50:09,099 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:50:09,099 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:50:09,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:50:09,200 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 14:50:09,200 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:50:09,200 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [306858208] [2023-12-02 14:50:09,200 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [306858208] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:50:09,201 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 14:50:09,201 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-12-02 14:50:09,201 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1532072689] [2023-12-02 14:50:09,201 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:50:09,202 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 14:50:09,202 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:50:09,203 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 14:50:09,203 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-12-02 14:50:09,204 INFO L87 Difference]: Start difference. First operand 15 states and 23 transitions. Second operand has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:50:09,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:50:09,271 INFO L93 Difference]: Finished difference Result 33 states and 55 transitions. [2023-12-02 14:50:09,271 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 14:50:09,271 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2023-12-02 14:50:09,272 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:50:09,272 INFO L225 Difference]: With dead ends: 33 [2023-12-02 14:50:09,272 INFO L226 Difference]: Without dead ends: 23 [2023-12-02 14:50:09,273 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-12-02 14:50:09,275 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 19 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 14:50:09,275 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 5 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 14:50:09,276 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2023-12-02 14:50:09,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2023-12-02 14:50:09,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 22 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:50:09,283 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 31 transitions. [2023-12-02 14:50:09,283 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 31 transitions. Word has length 14 [2023-12-02 14:50:09,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:50:09,284 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 31 transitions. [2023-12-02 14:50:09,284 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:50:09,284 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 31 transitions. [2023-12-02 14:50:09,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2023-12-02 14:50:09,285 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:50:09,285 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:50:09,285 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-12-02 14:50:09,286 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:50:09,286 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:50:09,286 INFO L85 PathProgramCache]: Analyzing trace with hash 43539, now seen corresponding path program 1 times [2023-12-02 14:50:09,286 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:50:09,287 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1847005940] [2023-12-02 14:50:09,287 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:50:09,287 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:50:09,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:50:09,423 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-12-02 14:50:09,423 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:50:09,423 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1847005940] [2023-12-02 14:50:09,423 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1847005940] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:50:09,424 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [418647578] [2023-12-02 14:50:09,424 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:50:09,424 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:50:09,424 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:50:09,427 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:50:09,438 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-12-02 14:50:09,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:50:09,517 INFO L262 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 4 conjunts are in the unsatisfiable core [2023-12-02 14:50:09,523 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:50:09,581 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-12-02 14:50:09,581 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:50:09,608 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-12-02 14:50:09,609 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [418647578] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:50:09,609 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1097157296] [2023-12-02 14:50:09,629 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 14:50:09,629 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:50:09,632 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:50:09,637 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:50:09,637 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:50:10,233 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 14:50:10,382 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '334#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 14:50:10,383 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 14:50:10,383 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:50:10,383 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2023-12-02 14:50:10,383 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1141684324] [2023-12-02 14:50:10,383 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:50:10,384 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-12-02 14:50:10,384 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:50:10,385 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-12-02 14:50:10,386 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2023-12-02 14:50:10,386 INFO L87 Difference]: Start difference. First operand 23 states and 31 transitions. Second operand has 7 states, 7 states have (on average 3.857142857142857) internal successors, (27), 7 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:50:10,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:50:10,484 INFO L93 Difference]: Finished difference Result 43 states and 59 transitions. [2023-12-02 14:50:10,484 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 14:50:10,484 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.857142857142857) internal successors, (27), 7 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2023-12-02 14:50:10,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:50:10,485 INFO L225 Difference]: With dead ends: 43 [2023-12-02 14:50:10,485 INFO L226 Difference]: Without dead ends: 24 [2023-12-02 14:50:10,486 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 57 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2023-12-02 14:50:10,487 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 95 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 95 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 95 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 14:50:10,488 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 11 Invalid, 95 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 95 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 14:50:10,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2023-12-02 14:50:10,494 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2023-12-02 14:50:10,494 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 23 states have (on average 1.391304347826087) internal successors, (32), 23 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:50:10,495 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 32 transitions. [2023-12-02 14:50:10,495 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 32 transitions. Word has length 22 [2023-12-02 14:50:10,495 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:50:10,495 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 32 transitions. [2023-12-02 14:50:10,496 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.857142857142857) internal successors, (27), 7 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:50:10,496 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 32 transitions. [2023-12-02 14:50:10,496 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2023-12-02 14:50:10,497 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:50:10,497 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:50:10,503 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-12-02 14:50:10,697 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:50:10,698 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:50:10,698 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:50:10,698 INFO L85 PathProgramCache]: Analyzing trace with hash -1267423300, now seen corresponding path program 2 times [2023-12-02 14:50:10,699 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:50:10,699 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1415852550] [2023-12-02 14:50:10,699 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:50:10,699 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:50:10,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:50:10,831 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-12-02 14:50:10,831 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:50:10,831 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1415852550] [2023-12-02 14:50:10,832 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1415852550] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:50:10,832 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1024837336] [2023-12-02 14:50:10,832 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 14:50:10,832 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:50:10,832 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:50:10,833 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:50:10,839 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-12-02 14:50:10,917 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-12-02 14:50:10,917 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 14:50:10,918 INFO L262 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 4 conjunts are in the unsatisfiable core [2023-12-02 14:50:10,920 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:50:10,984 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-12-02 14:50:10,985 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:50:11,025 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-12-02 14:50:11,025 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1024837336] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:50:11,025 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2123381703] [2023-12-02 14:50:11,029 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 14:50:11,029 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:50:11,029 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:50:11,029 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:50:11,029 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:50:11,433 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 14:50:11,583 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '600#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 14:50:11,583 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 14:50:11,583 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:50:11,584 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2023-12-02 14:50:11,584 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [94084435] [2023-12-02 14:50:11,584 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:50:11,585 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-12-02 14:50:11,585 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:50:11,586 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-12-02 14:50:11,587 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=116, Unknown=0, NotChecked=0, Total=156 [2023-12-02 14:50:11,587 INFO L87 Difference]: Start difference. First operand 24 states and 32 transitions. Second operand has 8 states, 8 states have (on average 5.0) internal successors, (40), 8 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:50:11,689 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:50:11,690 INFO L93 Difference]: Finished difference Result 49 states and 71 transitions. [2023-12-02 14:50:11,690 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-12-02 14:50:11,690 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 5.0) internal successors, (40), 8 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2023-12-02 14:50:11,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:50:11,691 INFO L225 Difference]: With dead ends: 49 [2023-12-02 14:50:11,691 INFO L226 Difference]: Without dead ends: 32 [2023-12-02 14:50:11,692 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 58 SyntacticMatches, 3 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=40, Invalid=116, Unknown=0, NotChecked=0, Total=156 [2023-12-02 14:50:11,693 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 8 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 88 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 14:50:11,694 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 9 Invalid, 88 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 14:50:11,695 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2023-12-02 14:50:11,701 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2023-12-02 14:50:11,702 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 31 states have (on average 1.2903225806451613) internal successors, (40), 31 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:50:11,702 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 40 transitions. [2023-12-02 14:50:11,703 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 40 transitions. Word has length 23 [2023-12-02 14:50:11,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:50:11,703 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 40 transitions. [2023-12-02 14:50:11,703 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 5.0) internal successors, (40), 8 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:50:11,703 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 40 transitions. [2023-12-02 14:50:11,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2023-12-02 14:50:11,704 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:50:11,705 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:50:11,710 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-12-02 14:50:11,906 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:50:11,907 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:50:11,907 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:50:11,908 INFO L85 PathProgramCache]: Analyzing trace with hash -952938097, now seen corresponding path program 3 times [2023-12-02 14:50:11,908 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:50:11,908 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1988976275] [2023-12-02 14:50:11,908 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:50:11,908 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:50:12,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:50:15,107 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:50:15,107 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:50:15,108 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1988976275] [2023-12-02 14:50:15,108 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1988976275] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:50:15,108 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1303790239] [2023-12-02 14:50:15,108 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 14:50:15,108 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:50:15,109 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:50:15,110 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:50:15,119 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-12-02 14:50:15,203 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 14:50:15,203 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 14:50:15,206 INFO L262 TraceCheckSpWp]: Trace formula consists of 170 conjuncts, 80 conjunts are in the unsatisfiable core [2023-12-02 14:50:15,210 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:50:15,251 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2023-12-02 14:50:15,489 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:50:15,489 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:50:16,682 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-12-02 14:50:16,683 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1303790239] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:50:16,683 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1735884816] [2023-12-02 14:50:16,686 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 14:50:16,686 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:50:16,687 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:50:16,687 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:50:16,687 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:50:17,043 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 14:50:17,441 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '979#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 14:50:17,441 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 14:50:17,441 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:50:17,441 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 45 [2023-12-02 14:50:17,441 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [663539704] [2023-12-02 14:50:17,441 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:50:17,442 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2023-12-02 14:50:17,442 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:50:17,443 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2023-12-02 14:50:17,444 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=151, Invalid=2299, Unknown=0, NotChecked=0, Total=2450 [2023-12-02 14:50:17,445 INFO L87 Difference]: Start difference. First operand 32 states and 40 transitions. Second operand has 45 states, 45 states have (on average 1.3111111111111111) internal successors, (59), 45 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:50:18,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:50:18,178 INFO L93 Difference]: Finished difference Result 57 states and 72 transitions. [2023-12-02 14:50:18,178 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2023-12-02 14:50:18,178 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 1.3111111111111111) internal successors, (59), 45 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 31 [2023-12-02 14:50:18,179 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:50:18,180 INFO L225 Difference]: With dead ends: 57 [2023-12-02 14:50:18,180 INFO L226 Difference]: Without dead ends: 54 [2023-12-02 14:50:18,182 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 566 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=157, Invalid=2393, Unknown=0, NotChecked=0, Total=2550 [2023-12-02 14:50:18,183 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 3 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 1139 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 1140 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 1139 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-12-02 14:50:18,183 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 63 Invalid, 1140 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 1139 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-12-02 14:50:18,184 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2023-12-02 14:50:18,194 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 52. [2023-12-02 14:50:18,195 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 51 states have (on average 1.3137254901960784) internal successors, (67), 51 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:50:18,196 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 67 transitions. [2023-12-02 14:50:18,196 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 67 transitions. Word has length 31 [2023-12-02 14:50:18,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:50:18,197 INFO L495 AbstractCegarLoop]: Abstraction has 52 states and 67 transitions. [2023-12-02 14:50:18,197 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 1.3111111111111111) internal successors, (59), 45 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:50:18,197 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 67 transitions. [2023-12-02 14:50:18,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2023-12-02 14:50:18,198 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:50:18,198 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:50:18,205 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-12-02 14:50:18,399 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:50:18,399 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:50:18,400 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:50:18,400 INFO L85 PathProgramCache]: Analyzing trace with hash -1509904190, now seen corresponding path program 4 times [2023-12-02 14:50:18,400 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:50:18,400 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [511472474] [2023-12-02 14:50:18,400 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:50:18,400 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:50:18,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:50:18,530 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-12-02 14:50:18,530 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:50:18,530 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [511472474] [2023-12-02 14:50:18,531 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [511472474] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:50:18,531 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1180879331] [2023-12-02 14:50:18,531 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 14:50:18,531 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:50:18,531 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:50:18,532 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:50:18,539 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-12-02 14:50:18,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:50:18,616 INFO L262 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 8 conjunts are in the unsatisfiable core [2023-12-02 14:50:18,619 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:50:18,671 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-12-02 14:50:18,672 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:50:18,713 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-12-02 14:50:18,713 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1180879331] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:50:18,714 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [95513498] [2023-12-02 14:50:18,716 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 14:50:18,716 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:50:18,717 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:50:18,717 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:50:18,717 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:50:19,035 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 14:50:19,166 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1390#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 14:50:19,167 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 14:50:19,167 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:50:19,167 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 13 [2023-12-02 14:50:19,167 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1935168534] [2023-12-02 14:50:19,167 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:50:19,168 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-12-02 14:50:19,168 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:50:19,168 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-12-02 14:50:19,169 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2023-12-02 14:50:19,169 INFO L87 Difference]: Start difference. First operand 52 states and 67 transitions. Second operand has 13 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 13 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:50:19,357 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:50:19,357 INFO L93 Difference]: Finished difference Result 102 states and 132 transitions. [2023-12-02 14:50:19,357 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-12-02 14:50:19,357 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 13 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2023-12-02 14:50:19,358 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:50:19,358 INFO L225 Difference]: With dead ends: 102 [2023-12-02 14:50:19,358 INFO L226 Difference]: Without dead ends: 53 [2023-12-02 14:50:19,359 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 82 SyntacticMatches, 4 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 103 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2023-12-02 14:50:19,360 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 4 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 211 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 262 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 211 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 14:50:19,360 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 15 Invalid, 262 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 211 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 14:50:19,361 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2023-12-02 14:50:19,370 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2023-12-02 14:50:19,371 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 52 states have (on average 1.3076923076923077) internal successors, (68), 52 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:50:19,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 68 transitions. [2023-12-02 14:50:19,372 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 68 transitions. Word has length 32 [2023-12-02 14:50:19,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:50:19,372 INFO L495 AbstractCegarLoop]: Abstraction has 53 states and 68 transitions. [2023-12-02 14:50:19,372 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 13 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:50:19,372 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 68 transitions. [2023-12-02 14:50:19,373 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2023-12-02 14:50:19,373 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:50:19,373 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:50:19,379 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-12-02 14:50:19,578 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:50:19,579 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:50:19,579 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:50:19,579 INFO L85 PathProgramCache]: Analyzing trace with hash -162107605, now seen corresponding path program 5 times [2023-12-02 14:50:19,579 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:50:19,579 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1008149584] [2023-12-02 14:50:19,579 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:50:19,580 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:50:19,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:50:19,724 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-12-02 14:50:19,725 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:50:19,725 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1008149584] [2023-12-02 14:50:19,725 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1008149584] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:50:19,725 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1373690633] [2023-12-02 14:50:19,725 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 14:50:19,725 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:50:19,725 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:50:19,726 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:50:19,729 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-12-02 14:50:19,825 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-12-02 14:50:19,826 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 14:50:19,827 INFO L262 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 8 conjunts are in the unsatisfiable core [2023-12-02 14:50:19,830 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:50:19,908 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-12-02 14:50:19,909 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:50:19,984 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-12-02 14:50:19,984 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1373690633] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:50:19,985 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [654433435] [2023-12-02 14:50:19,987 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 14:50:19,988 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:50:19,988 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:50:19,988 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:50:19,988 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:50:20,314 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 14:50:20,450 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1898#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 14:50:20,450 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 14:50:20,451 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:50:20,451 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2023-12-02 14:50:20,451 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1976895942] [2023-12-02 14:50:20,451 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:50:20,451 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-12-02 14:50:20,452 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:50:20,452 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-12-02 14:50:20,452 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=276, Unknown=0, NotChecked=0, Total=342 [2023-12-02 14:50:20,453 INFO L87 Difference]: Start difference. First operand 53 states and 68 transitions. Second operand has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:50:20,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:50:20,556 INFO L93 Difference]: Finished difference Result 82 states and 110 transitions. [2023-12-02 14:50:20,556 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-12-02 14:50:20,557 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 33 [2023-12-02 14:50:20,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:50:20,557 INFO L225 Difference]: With dead ends: 82 [2023-12-02 14:50:20,557 INFO L226 Difference]: Without dead ends: 41 [2023-12-02 14:50:20,558 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 83 SyntacticMatches, 6 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 146 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=72, Invalid=308, Unknown=0, NotChecked=0, Total=380 [2023-12-02 14:50:20,559 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 35 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 100 mSolverCounterSat, 42 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 142 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 42 IncrementalHoareTripleChecker+Valid, 100 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 14:50:20,559 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [35 Valid, 11 Invalid, 142 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [42 Valid, 100 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 14:50:20,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2023-12-02 14:50:20,566 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2023-12-02 14:50:20,566 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 40 states have (on average 1.225) internal successors, (49), 40 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:50:20,567 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 49 transitions. [2023-12-02 14:50:20,567 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 49 transitions. Word has length 33 [2023-12-02 14:50:20,567 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:50:20,567 INFO L495 AbstractCegarLoop]: Abstraction has 41 states and 49 transitions. [2023-12-02 14:50:20,567 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:50:20,567 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 49 transitions. [2023-12-02 14:50:20,568 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2023-12-02 14:50:20,568 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:50:20,568 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:50:20,573 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-12-02 14:50:20,769 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-12-02 14:50:20,769 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:50:20,770 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:50:20,770 INFO L85 PathProgramCache]: Analyzing trace with hash 383720531, now seen corresponding path program 6 times [2023-12-02 14:50:20,770 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:50:20,770 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1492030262] [2023-12-02 14:50:20,770 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:50:20,770 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:50:20,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:50:25,411 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 54 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:50:25,411 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:50:25,411 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1492030262] [2023-12-02 14:50:25,411 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1492030262] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:50:25,411 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1387398556] [2023-12-02 14:50:25,411 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 14:50:25,411 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:50:25,411 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:50:25,412 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:50:25,414 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-12-02 14:50:25,499 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 14:50:25,500 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 14:50:25,503 WARN L260 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 114 conjunts are in the unsatisfiable core [2023-12-02 14:50:25,508 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:50:25,531 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2023-12-02 14:50:26,951 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 54 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:50:26,951 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:50:29,672 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 48 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-12-02 14:50:29,672 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1387398556] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:50:29,672 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1808949331] [2023-12-02 14:50:29,674 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 14:50:29,674 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:50:29,675 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:50:29,675 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:50:29,675 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:50:29,912 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 14:50:30,498 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2458#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 14:50:30,498 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 14:50:30,498 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:50:30,498 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 33, 32] total 86 [2023-12-02 14:50:30,498 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1279896431] [2023-12-02 14:50:30,499 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:50:30,499 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 86 states [2023-12-02 14:50:30,499 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:50:30,501 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2023-12-02 14:50:30,505 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=311, Invalid=7879, Unknown=0, NotChecked=0, Total=8190 [2023-12-02 14:50:30,505 INFO L87 Difference]: Start difference. First operand 41 states and 49 transitions. Second operand has 86 states, 86 states have (on average 1.2209302325581395) internal successors, (105), 86 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:50:37,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:50:37,759 INFO L93 Difference]: Finished difference Result 98 states and 122 transitions. [2023-12-02 14:50:37,759 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2023-12-02 14:50:37,759 INFO L78 Accepts]: Start accepts. Automaton has has 86 states, 86 states have (on average 1.2209302325581395) internal successors, (105), 86 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 40 [2023-12-02 14:50:37,760 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:50:37,761 INFO L225 Difference]: With dead ends: 98 [2023-12-02 14:50:37,761 INFO L226 Difference]: Without dead ends: 95 [2023-12-02 14:50:37,766 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 68 SyntacticMatches, 0 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3400 ImplicationChecksByTransitivity, 10.0s TimeCoverageRelationStatistics Valid=699, Invalid=15303, Unknown=0, NotChecked=0, Total=16002 [2023-12-02 14:50:37,766 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 47 mSDsluCounter, 187 mSDsCounter, 0 mSdLazyCounter, 3713 mSolverCounterSat, 309 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 192 SdHoareTripleChecker+Invalid, 4022 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 309 IncrementalHoareTripleChecker+Valid, 3713 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.9s IncrementalHoareTripleChecker+Time [2023-12-02 14:50:37,767 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [47 Valid, 192 Invalid, 4022 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [309 Valid, 3713 Invalid, 0 Unknown, 0 Unchecked, 2.9s Time] [2023-12-02 14:50:37,767 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2023-12-02 14:50:37,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 55. [2023-12-02 14:50:37,793 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 54 states have (on average 1.2407407407407407) internal successors, (67), 54 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:50:37,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 67 transitions. [2023-12-02 14:50:37,793 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 67 transitions. Word has length 40 [2023-12-02 14:50:37,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:50:37,794 INFO L495 AbstractCegarLoop]: Abstraction has 55 states and 67 transitions. [2023-12-02 14:50:37,794 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 86 states, 86 states have (on average 1.2209302325581395) internal successors, (105), 86 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:50:37,794 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 67 transitions. [2023-12-02 14:50:37,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2023-12-02 14:50:37,795 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:50:37,795 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:50:37,800 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-12-02 14:50:37,996 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2023-12-02 14:50:37,996 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:50:37,996 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:50:37,996 INFO L85 PathProgramCache]: Analyzing trace with hash 1817688811, now seen corresponding path program 7 times [2023-12-02 14:50:37,997 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:50:37,997 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [790562127] [2023-12-02 14:50:37,997 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:50:37,997 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:50:38,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:50:38,136 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 7 proven. 9 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2023-12-02 14:50:38,136 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:50:38,136 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [790562127] [2023-12-02 14:50:38,136 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [790562127] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:50:38,136 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [804290022] [2023-12-02 14:50:38,137 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 14:50:38,137 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:50:38,137 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:50:38,138 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:50:38,140 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-12-02 14:50:38,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:50:38,238 INFO L262 TraceCheckSpWp]: Trace formula consists of 224 conjuncts, 10 conjunts are in the unsatisfiable core [2023-12-02 14:50:38,241 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:50:38,336 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2023-12-02 14:50:38,336 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:50:38,415 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2023-12-02 14:50:38,415 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [804290022] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:50:38,415 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1217166925] [2023-12-02 14:50:38,418 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 14:50:38,418 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:50:38,418 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:50:38,418 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:50:38,419 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:50:38,669 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 14:50:38,791 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3082#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 14:50:38,791 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 14:50:38,791 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:50:38,791 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 17 [2023-12-02 14:50:38,791 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1374225712] [2023-12-02 14:50:38,792 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:50:38,792 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-12-02 14:50:38,792 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:50:38,793 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-12-02 14:50:38,793 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=371, Unknown=0, NotChecked=0, Total=462 [2023-12-02 14:50:38,793 INFO L87 Difference]: Start difference. First operand 55 states and 67 transitions. Second operand has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:50:38,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:50:38,998 INFO L93 Difference]: Finished difference Result 134 states and 165 transitions. [2023-12-02 14:50:38,999 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-12-02 14:50:38,999 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 41 [2023-12-02 14:50:38,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:50:39,000 INFO L225 Difference]: With dead ends: 134 [2023-12-02 14:50:39,000 INFO L226 Difference]: Without dead ends: 56 [2023-12-02 14:50:39,000 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 105 SyntacticMatches, 7 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 200 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=91, Invalid=371, Unknown=0, NotChecked=0, Total=462 [2023-12-02 14:50:39,001 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 8 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 173 mSolverCounterSat, 72 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 245 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 72 IncrementalHoareTripleChecker+Valid, 173 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 14:50:39,001 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 11 Invalid, 245 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [72 Valid, 173 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 14:50:39,002 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2023-12-02 14:50:39,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2023-12-02 14:50:39,038 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 55 states have (on average 1.2363636363636363) internal successors, (68), 55 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:50:39,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 68 transitions. [2023-12-02 14:50:39,038 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 68 transitions. Word has length 41 [2023-12-02 14:50:39,039 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:50:39,039 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 68 transitions. [2023-12-02 14:50:39,039 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:50:39,039 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 68 transitions. [2023-12-02 14:50:39,040 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2023-12-02 14:50:39,040 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:50:39,040 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:50:39,047 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2023-12-02 14:50:39,241 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:50:39,241 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:50:39,241 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:50:39,241 INFO L85 PathProgramCache]: Analyzing trace with hash 1605837474, now seen corresponding path program 8 times [2023-12-02 14:50:39,241 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:50:39,242 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [27865635] [2023-12-02 14:50:39,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:50:39,242 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:50:39,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:50:39,426 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2023-12-02 14:50:39,426 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:50:39,427 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [27865635] [2023-12-02 14:50:39,427 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [27865635] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:50:39,427 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [327995345] [2023-12-02 14:50:39,427 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 14:50:39,427 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:50:39,428 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:50:39,429 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:50:39,431 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-12-02 14:50:39,548 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-12-02 14:50:39,548 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 14:50:39,550 INFO L262 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 10 conjunts are in the unsatisfiable core [2023-12-02 14:50:39,552 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:50:39,646 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2023-12-02 14:50:39,647 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:50:39,738 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2023-12-02 14:50:39,739 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [327995345] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:50:39,739 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [886671832] [2023-12-02 14:50:39,741 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 14:50:39,742 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:50:39,742 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:50:39,742 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:50:39,742 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:50:40,054 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 14:50:40,216 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3717#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 14:50:40,217 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 14:50:40,217 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:50:40,217 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 17 [2023-12-02 14:50:40,217 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1433253029] [2023-12-02 14:50:40,217 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:50:40,218 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-12-02 14:50:40,218 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:50:40,218 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-12-02 14:50:40,219 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=374, Unknown=0, NotChecked=0, Total=462 [2023-12-02 14:50:40,219 INFO L87 Difference]: Start difference. First operand 56 states and 68 transitions. Second operand has 17 states, 17 states have (on average 2.5294117647058822) internal successors, (43), 17 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:50:40,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:50:40,379 INFO L93 Difference]: Finished difference Result 95 states and 121 transitions. [2023-12-02 14:50:40,379 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-12-02 14:50:40,379 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.5294117647058822) internal successors, (43), 17 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 42 [2023-12-02 14:50:40,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:50:40,380 INFO L225 Difference]: With dead ends: 95 [2023-12-02 14:50:40,380 INFO L226 Difference]: Without dead ends: 50 [2023-12-02 14:50:40,381 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 107 SyntacticMatches, 8 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 228 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=95, Invalid=411, Unknown=0, NotChecked=0, Total=506 [2023-12-02 14:50:40,381 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 15 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 119 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 190 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 119 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 14:50:40,381 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 11 Invalid, 190 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 119 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 14:50:40,382 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2023-12-02 14:50:40,406 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2023-12-02 14:50:40,406 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 49 states have (on average 1.183673469387755) internal successors, (58), 49 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:50:40,407 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 58 transitions. [2023-12-02 14:50:40,407 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 58 transitions. Word has length 42 [2023-12-02 14:50:40,407 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:50:40,407 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 58 transitions. [2023-12-02 14:50:40,407 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.5294117647058822) internal successors, (43), 17 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:50:40,407 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 58 transitions. [2023-12-02 14:50:40,408 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2023-12-02 14:50:40,408 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:50:40,408 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:50:40,413 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2023-12-02 14:50:40,609 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-12-02 14:50:40,609 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:50:40,609 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:50:40,609 INFO L85 PathProgramCache]: Analyzing trace with hash -1129350065, now seen corresponding path program 9 times [2023-12-02 14:50:40,610 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:50:40,610 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1075337351] [2023-12-02 14:50:40,610 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:50:40,610 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:50:40,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:50:46,266 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 1 proven. 89 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:50:46,266 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:50:46,267 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1075337351] [2023-12-02 14:50:46,267 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1075337351] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:50:46,267 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [207993623] [2023-12-02 14:50:46,267 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 14:50:46,267 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:50:46,267 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:50:46,268 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:50:46,269 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-12-02 14:50:46,360 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 14:50:46,360 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 14:50:46,364 WARN L260 TraceCheckSpWp]: Trace formula consists of 268 conjuncts, 150 conjunts are in the unsatisfiable core [2023-12-02 14:50:46,368 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:50:46,390 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2023-12-02 14:50:48,875 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:50:48,875 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:50:53,772 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 80 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-12-02 14:50:53,772 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [207993623] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:50:53,772 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1460775581] [2023-12-02 14:50:53,774 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 14:50:53,775 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:50:53,775 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:50:53,775 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:50:53,775 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:50:53,998 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 14:50:54,749 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4401#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 14:50:54,749 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 14:50:54,749 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:50:54,749 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 42, 40] total 112 [2023-12-02 14:50:54,749 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2028478196] [2023-12-02 14:50:54,749 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:50:54,750 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 112 states [2023-12-02 14:50:54,750 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:50:54,751 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 112 interpolants. [2023-12-02 14:50:54,755 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=414, Invalid=13158, Unknown=0, NotChecked=0, Total=13572 [2023-12-02 14:50:54,756 INFO L87 Difference]: Start difference. First operand 50 states and 58 transitions. Second operand has 112 states, 112 states have (on average 1.1696428571428572) internal successors, (131), 112 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:51:04,895 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:51:04,895 INFO L93 Difference]: Finished difference Result 116 states and 138 transitions. [2023-12-02 14:51:04,895 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2023-12-02 14:51:04,896 INFO L78 Accepts]: Start accepts. Automaton has has 112 states, 112 states have (on average 1.1696428571428572) internal successors, (131), 112 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 49 [2023-12-02 14:51:04,896 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:51:04,897 INFO L225 Difference]: With dead ends: 116 [2023-12-02 14:51:04,897 INFO L226 Difference]: Without dead ends: 113 [2023-12-02 14:51:04,905 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 237 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 159 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5842 ImplicationChecksByTransitivity, 15.0s TimeCoverageRelationStatistics Valid=986, Invalid=24774, Unknown=0, NotChecked=0, Total=25760 [2023-12-02 14:51:04,905 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 42 mSDsluCounter, 265 mSDsCounter, 0 mSdLazyCounter, 5916 mSolverCounterSat, 433 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 270 SdHoareTripleChecker+Invalid, 6349 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 433 IncrementalHoareTripleChecker+Valid, 5916 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.4s IncrementalHoareTripleChecker+Time [2023-12-02 14:51:04,906 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [42 Valid, 270 Invalid, 6349 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [433 Valid, 5916 Invalid, 0 Unknown, 0 Unchecked, 4.4s Time] [2023-12-02 14:51:04,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2023-12-02 14:51:04,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 67. [2023-12-02 14:51:04,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 66 states have (on average 1.196969696969697) internal successors, (79), 66 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:51:04,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 79 transitions. [2023-12-02 14:51:04,956 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 79 transitions. Word has length 49 [2023-12-02 14:51:04,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:51:04,956 INFO L495 AbstractCegarLoop]: Abstraction has 67 states and 79 transitions. [2023-12-02 14:51:04,956 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 112 states, 112 states have (on average 1.1696428571428572) internal successors, (131), 112 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:51:04,956 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 79 transitions. [2023-12-02 14:51:04,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2023-12-02 14:51:04,957 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:51:04,957 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:51:04,963 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2023-12-02 14:51:05,157 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:51:05,158 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:51:05,158 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:51:05,158 INFO L85 PathProgramCache]: Analyzing trace with hash -1858882003, now seen corresponding path program 10 times [2023-12-02 14:51:05,158 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:51:05,159 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1173711587] [2023-12-02 14:51:05,159 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:51:05,159 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:51:05,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:51:05,356 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 11 proven. 14 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2023-12-02 14:51:05,357 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:51:05,357 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1173711587] [2023-12-02 14:51:05,357 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1173711587] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:51:05,357 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [328370282] [2023-12-02 14:51:05,357 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 14:51:05,357 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:51:05,358 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:51:05,358 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:51:05,360 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-12-02 14:51:05,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:51:05,431 INFO L262 TraceCheckSpWp]: Trace formula consists of 273 conjuncts, 12 conjunts are in the unsatisfiable core [2023-12-02 14:51:05,433 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:51:05,519 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2023-12-02 14:51:05,519 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:51:05,582 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2023-12-02 14:51:05,582 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [328370282] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:51:05,582 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [170973899] [2023-12-02 14:51:05,584 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 14:51:05,584 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:51:05,585 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:51:05,585 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:51:05,585 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:51:05,784 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 14:51:05,922 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5158#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 14:51:05,922 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 14:51:05,922 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:51:05,923 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2023-12-02 14:51:05,923 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [675737746] [2023-12-02 14:51:05,923 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:51:05,923 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2023-12-02 14:51:05,924 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:51:05,924 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2023-12-02 14:51:05,924 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=476, Unknown=0, NotChecked=0, Total=600 [2023-12-02 14:51:05,925 INFO L87 Difference]: Start difference. First operand 67 states and 79 transitions. Second operand has 20 states, 20 states have (on average 1.95) internal successors, (39), 20 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:51:06,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:51:06,239 INFO L93 Difference]: Finished difference Result 164 states and 195 transitions. [2023-12-02 14:51:06,239 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-12-02 14:51:06,239 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.95) internal successors, (39), 20 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 50 [2023-12-02 14:51:06,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:51:06,240 INFO L225 Difference]: With dead ends: 164 [2023-12-02 14:51:06,240 INFO L226 Difference]: Without dead ends: 68 [2023-12-02 14:51:06,241 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 129 SyntacticMatches, 9 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 284 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=124, Invalid=476, Unknown=0, NotChecked=0, Total=600 [2023-12-02 14:51:06,241 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 4 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 405 mSolverCounterSat, 100 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 505 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 100 IncrementalHoareTripleChecker+Valid, 405 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 14:51:06,242 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 17 Invalid, 505 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [100 Valid, 405 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 14:51:06,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2023-12-02 14:51:06,284 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2023-12-02 14:51:06,285 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 67 states have (on average 1.1940298507462686) internal successors, (80), 67 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:51:06,285 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 80 transitions. [2023-12-02 14:51:06,285 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 80 transitions. Word has length 50 [2023-12-02 14:51:06,285 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:51:06,285 INFO L495 AbstractCegarLoop]: Abstraction has 68 states and 80 transitions. [2023-12-02 14:51:06,285 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.95) internal successors, (39), 20 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:51:06,286 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 80 transitions. [2023-12-02 14:51:06,286 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2023-12-02 14:51:06,286 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:51:06,287 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:51:06,293 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2023-12-02 14:51:06,487 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:51:06,487 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:51:06,488 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:51:06,488 INFO L85 PathProgramCache]: Analyzing trace with hash 632818774, now seen corresponding path program 11 times [2023-12-02 14:51:06,488 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:51:06,488 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [554011938] [2023-12-02 14:51:06,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:51:06,488 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:51:06,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:51:06,642 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 6 proven. 19 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2023-12-02 14:51:06,642 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:51:06,642 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [554011938] [2023-12-02 14:51:06,643 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [554011938] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:51:06,643 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1776547153] [2023-12-02 14:51:06,643 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 14:51:06,643 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:51:06,643 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:51:06,644 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:51:06,645 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-12-02 14:51:06,745 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-12-02 14:51:06,745 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 14:51:06,747 INFO L262 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 12 conjunts are in the unsatisfiable core [2023-12-02 14:51:06,748 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:51:06,843 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2023-12-02 14:51:06,844 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:51:06,935 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2023-12-02 14:51:06,936 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1776547153] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:51:06,936 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1109422632] [2023-12-02 14:51:06,937 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 14:51:06,938 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:51:06,938 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:51:06,938 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:51:06,938 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:51:07,158 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 14:51:07,280 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5934#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 14:51:07,280 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 14:51:07,280 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:51:07,280 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2023-12-02 14:51:07,280 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [501141985] [2023-12-02 14:51:07,280 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:51:07,281 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2023-12-02 14:51:07,281 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:51:07,281 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2023-12-02 14:51:07,281 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=486, Unknown=0, NotChecked=0, Total=600 [2023-12-02 14:51:07,282 INFO L87 Difference]: Start difference. First operand 68 states and 80 transitions. Second operand has 20 states, 20 states have (on average 2.65) internal successors, (53), 20 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:51:07,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:51:07,457 INFO L93 Difference]: Finished difference Result 114 states and 140 transitions. [2023-12-02 14:51:07,458 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-12-02 14:51:07,458 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.65) internal successors, (53), 20 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 51 [2023-12-02 14:51:07,458 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:51:07,459 INFO L225 Difference]: With dead ends: 114 [2023-12-02 14:51:07,459 INFO L226 Difference]: Without dead ends: 59 [2023-12-02 14:51:07,459 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 131 SyntacticMatches, 10 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 325 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=122, Invalid=528, Unknown=0, NotChecked=0, Total=650 [2023-12-02 14:51:07,459 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 9 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 171 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 242 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 171 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 14:51:07,460 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 13 Invalid, 242 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 171 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 14:51:07,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2023-12-02 14:51:07,504 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2023-12-02 14:51:07,504 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 58 states have (on average 1.1551724137931034) internal successors, (67), 58 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:51:07,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 67 transitions. [2023-12-02 14:51:07,505 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 67 transitions. Word has length 51 [2023-12-02 14:51:07,505 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:51:07,505 INFO L495 AbstractCegarLoop]: Abstraction has 59 states and 67 transitions. [2023-12-02 14:51:07,505 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.65) internal successors, (53), 20 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:51:07,505 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 67 transitions. [2023-12-02 14:51:07,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2023-12-02 14:51:07,506 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:51:07,506 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:51:07,510 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2023-12-02 14:51:07,706 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2023-12-02 14:51:07,706 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:51:07,707 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:51:07,707 INFO L85 PathProgramCache]: Analyzing trace with hash 362737299, now seen corresponding path program 12 times [2023-12-02 14:51:07,707 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:51:07,707 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1054519847] [2023-12-02 14:51:07,707 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:51:07,707 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:51:07,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:51:17,082 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 7 proven. 128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:51:17,082 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:51:17,082 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1054519847] [2023-12-02 14:51:17,082 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1054519847] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:51:17,082 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [293859904] [2023-12-02 14:51:17,082 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 14:51:17,083 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:51:17,083 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:51:17,084 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:51:17,085 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-12-02 14:51:17,201 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 14:51:17,202 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 14:51:17,207 WARN L260 TraceCheckSpWp]: Trace formula consists of 317 conjuncts, 182 conjunts are in the unsatisfiable core [2023-12-02 14:51:17,213 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:51:17,365 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2023-12-02 14:51:20,535 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 0 proven. 135 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:51:20,535 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:51:28,609 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-12-02 14:51:28,609 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [293859904] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:51:28,609 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [973638046] [2023-12-02 14:51:28,611 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 14:51:28,611 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:51:28,611 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:51:28,611 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:51:28,611 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:51:28,807 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 14:51:29,622 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6747#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 14:51:29,622 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 14:51:29,622 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:51:29,622 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 51, 48] total 131 [2023-12-02 14:51:29,622 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [274988670] [2023-12-02 14:51:29,623 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:51:29,623 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 131 states [2023-12-02 14:51:29,623 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:51:29,624 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 131 interpolants. [2023-12-02 14:51:29,626 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=470, Invalid=17890, Unknown=0, NotChecked=0, Total=18360 [2023-12-02 14:51:29,626 INFO L87 Difference]: Start difference. First operand 59 states and 67 transitions. Second operand has 131 states, 131 states have (on average 1.1450381679389312) internal successors, (150), 131 states have internal predecessors, (150), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:51:45,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:51:45,057 INFO L93 Difference]: Finished difference Result 127 states and 148 transitions. [2023-12-02 14:51:45,057 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2023-12-02 14:51:45,058 INFO L78 Accepts]: Start accepts. Automaton has has 131 states, 131 states have (on average 1.1450381679389312) internal successors, (150), 131 states have internal predecessors, (150), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 58 [2023-12-02 14:51:45,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:51:45,058 INFO L225 Difference]: With dead ends: 127 [2023-12-02 14:51:45,058 INFO L226 Difference]: Without dead ends: 124 [2023-12-02 14:51:45,061 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 283 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 188 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7533 ImplicationChecksByTransitivity, 22.9s TimeCoverageRelationStatistics Valid=1293, Invalid=34617, Unknown=0, NotChecked=0, Total=35910 [2023-12-02 14:51:45,061 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 35 mSDsluCounter, 347 mSDsCounter, 0 mSdLazyCounter, 8779 mSolverCounterSat, 544 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 352 SdHoareTripleChecker+Invalid, 9323 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 544 IncrementalHoareTripleChecker+Valid, 8779 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.5s IncrementalHoareTripleChecker+Time [2023-12-02 14:51:45,061 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [35 Valid, 352 Invalid, 9323 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [544 Valid, 8779 Invalid, 0 Unknown, 0 Unchecked, 6.5s Time] [2023-12-02 14:51:45,062 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2023-12-02 14:51:45,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 79. [2023-12-02 14:51:45,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 78 states have (on average 1.1666666666666667) internal successors, (91), 78 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:51:45,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 91 transitions. [2023-12-02 14:51:45,127 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 91 transitions. Word has length 58 [2023-12-02 14:51:45,127 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:51:45,127 INFO L495 AbstractCegarLoop]: Abstraction has 79 states and 91 transitions. [2023-12-02 14:51:45,127 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 131 states, 131 states have (on average 1.1450381679389312) internal successors, (150), 131 states have internal predecessors, (150), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:51:45,127 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 91 transitions. [2023-12-02 14:51:45,128 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2023-12-02 14:51:45,128 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:51:45,128 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:51:45,133 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2023-12-02 14:51:45,328 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2023-12-02 14:51:45,329 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:51:45,329 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:51:45,329 INFO L85 PathProgramCache]: Analyzing trace with hash -854798869, now seen corresponding path program 13 times [2023-12-02 14:51:45,329 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:51:45,329 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1644549900] [2023-12-02 14:51:45,329 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:51:45,330 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:51:45,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:51:45,521 INFO L134 CoverageAnalysis]: Checked inductivity of 141 backedges. 16 proven. 20 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2023-12-02 14:51:45,521 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:51:45,521 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1644549900] [2023-12-02 14:51:45,521 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1644549900] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:51:45,522 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1169630312] [2023-12-02 14:51:45,522 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 14:51:45,522 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:51:45,522 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:51:45,523 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:51:45,524 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-12-02 14:51:45,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:51:45,665 INFO L262 TraceCheckSpWp]: Trace formula consists of 322 conjuncts, 14 conjunts are in the unsatisfiable core [2023-12-02 14:51:45,666 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:51:45,820 INFO L134 CoverageAnalysis]: Checked inductivity of 141 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2023-12-02 14:51:45,820 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:51:45,927 INFO L134 CoverageAnalysis]: Checked inductivity of 141 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2023-12-02 14:51:45,927 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1169630312] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:51:45,928 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [116895070] [2023-12-02 14:51:45,929 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 14:51:45,929 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:51:45,930 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:51:45,930 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:51:45,930 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:51:46,152 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 14:51:46,294 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7627#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 14:51:46,294 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 14:51:46,295 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:51:46,295 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 23 [2023-12-02 14:51:46,295 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1681812627] [2023-12-02 14:51:46,295 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:51:46,295 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2023-12-02 14:51:46,296 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:51:46,296 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2023-12-02 14:51:46,296 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=156, Invalid=600, Unknown=0, NotChecked=0, Total=756 [2023-12-02 14:51:46,296 INFO L87 Difference]: Start difference. First operand 79 states and 91 transitions. Second operand has 23 states, 23 states have (on average 1.826086956521739) internal successors, (42), 23 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:51:46,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:51:46,653 INFO L93 Difference]: Finished difference Result 194 states and 225 transitions. [2023-12-02 14:51:46,653 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-12-02 14:51:46,653 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.826086956521739) internal successors, (42), 23 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 59 [2023-12-02 14:51:46,653 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:51:46,654 INFO L225 Difference]: With dead ends: 194 [2023-12-02 14:51:46,654 INFO L226 Difference]: Without dead ends: 80 [2023-12-02 14:51:46,654 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 153 SyntacticMatches, 11 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 377 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=156, Invalid=600, Unknown=0, NotChecked=0, Total=756 [2023-12-02 14:51:46,655 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 10 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 433 mSolverCounterSat, 73 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 506 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 73 IncrementalHoareTripleChecker+Valid, 433 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 14:51:46,655 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 17 Invalid, 506 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [73 Valid, 433 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 14:51:46,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2023-12-02 14:51:46,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 80. [2023-12-02 14:51:46,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 79 states have (on average 1.1645569620253164) internal successors, (92), 79 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:51:46,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 92 transitions. [2023-12-02 14:51:46,715 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 92 transitions. Word has length 59 [2023-12-02 14:51:46,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:51:46,716 INFO L495 AbstractCegarLoop]: Abstraction has 80 states and 92 transitions. [2023-12-02 14:51:46,716 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.826086956521739) internal successors, (42), 23 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:51:46,716 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 92 transitions. [2023-12-02 14:51:46,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2023-12-02 14:51:46,716 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:51:46,717 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:51:46,721 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2023-12-02 14:51:46,917 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2023-12-02 14:51:46,918 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:51:46,918 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:51:46,918 INFO L85 PathProgramCache]: Analyzing trace with hash -657697310, now seen corresponding path program 14 times [2023-12-02 14:51:46,918 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:51:46,918 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1302579892] [2023-12-02 14:51:46,918 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:51:46,918 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:51:46,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:51:47,118 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 10 proven. 26 refuted. 0 times theorem prover too weak. 111 trivial. 0 not checked. [2023-12-02 14:51:47,118 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:51:47,118 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1302579892] [2023-12-02 14:51:47,118 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1302579892] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:51:47,118 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [619528245] [2023-12-02 14:51:47,118 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 14:51:47,119 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:51:47,119 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:51:47,120 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:51:47,122 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2023-12-02 14:51:47,280 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-12-02 14:51:47,280 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 14:51:47,282 INFO L262 TraceCheckSpWp]: Trace formula consists of 331 conjuncts, 14 conjunts are in the unsatisfiable core [2023-12-02 14:51:47,284 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:51:47,417 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 15 proven. 21 refuted. 0 times theorem prover too weak. 111 trivial. 0 not checked. [2023-12-02 14:51:47,417 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:51:47,545 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 15 proven. 21 refuted. 0 times theorem prover too weak. 111 trivial. 0 not checked. [2023-12-02 14:51:47,545 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [619528245] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:51:47,545 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1166361496] [2023-12-02 14:51:47,547 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 14:51:47,547 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:51:47,547 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:51:47,547 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:51:47,547 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:51:47,747 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 14:51:47,885 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8544#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 14:51:47,885 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 14:51:47,885 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:51:47,885 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 23 [2023-12-02 14:51:47,885 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [257843166] [2023-12-02 14:51:47,885 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:51:47,886 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2023-12-02 14:51:47,886 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:51:47,886 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2023-12-02 14:51:47,887 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=612, Unknown=0, NotChecked=0, Total=756 [2023-12-02 14:51:47,887 INFO L87 Difference]: Start difference. First operand 80 states and 92 transitions. Second operand has 23 states, 23 states have (on average 2.5652173913043477) internal successors, (59), 23 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:51:48,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:51:48,155 INFO L93 Difference]: Finished difference Result 133 states and 159 transitions. [2023-12-02 14:51:48,155 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-12-02 14:51:48,156 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.5652173913043477) internal successors, (59), 23 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2023-12-02 14:51:48,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:51:48,156 INFO L225 Difference]: With dead ends: 133 [2023-12-02 14:51:48,156 INFO L226 Difference]: Without dead ends: 68 [2023-12-02 14:51:48,157 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 194 GetRequests, 155 SyntacticMatches, 12 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 437 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=153, Invalid=659, Unknown=0, NotChecked=0, Total=812 [2023-12-02 14:51:48,158 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 7 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 221 mSolverCounterSat, 111 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 332 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 111 IncrementalHoareTripleChecker+Valid, 221 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 14:51:48,158 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 17 Invalid, 332 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [111 Valid, 221 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 14:51:48,158 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2023-12-02 14:51:48,229 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2023-12-02 14:51:48,229 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 67 states have (on average 1.1343283582089552) internal successors, (76), 67 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:51:48,229 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 76 transitions. [2023-12-02 14:51:48,229 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 76 transitions. Word has length 60 [2023-12-02 14:51:48,230 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:51:48,230 INFO L495 AbstractCegarLoop]: Abstraction has 68 states and 76 transitions. [2023-12-02 14:51:48,230 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 2.5652173913043477) internal successors, (59), 23 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:51:48,230 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 76 transitions. [2023-12-02 14:51:48,230 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2023-12-02 14:51:48,231 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:51:48,231 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:51:48,236 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2023-12-02 14:51:48,431 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2023-12-02 14:51:48,431 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:51:48,432 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:51:48,432 INFO L85 PathProgramCache]: Analyzing trace with hash -1956296945, now seen corresponding path program 15 times [2023-12-02 14:51:48,432 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:51:48,432 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1746819436] [2023-12-02 14:51:48,432 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:51:48,432 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:51:49,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:52:00,234 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 13 proven. 176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:52:00,234 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:52:00,234 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1746819436] [2023-12-02 14:52:00,234 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1746819436] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:52:00,234 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [521973613] [2023-12-02 14:52:00,234 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 14:52:00,234 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:52:00,234 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:52:00,235 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:52:00,237 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2023-12-02 14:52:00,363 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 14:52:00,363 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 14:52:00,370 WARN L260 TraceCheckSpWp]: Trace formula consists of 366 conjuncts, 218 conjunts are in the unsatisfiable core [2023-12-02 14:52:00,376 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:52:00,563 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2023-12-02 14:52:06,015 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 0 proven. 189 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:52:06,015 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:52:18,984 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 0 proven. 168 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-12-02 14:52:18,984 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [521973613] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:52:18,984 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1430526831] [2023-12-02 14:52:18,986 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 14:52:18,986 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:52:18,986 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:52:18,986 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:52:18,986 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:52:19,181 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 14:52:20,218 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9496#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 14:52:20,218 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 14:52:20,218 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:52:20,218 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [66, 60, 56] total 160 [2023-12-02 14:52:20,218 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1887075001] [2023-12-02 14:52:20,218 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:52:20,219 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 160 states [2023-12-02 14:52:20,219 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:52:20,220 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 160 interpolants. [2023-12-02 14:52:20,221 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=603, Invalid=26457, Unknown=0, NotChecked=0, Total=27060 [2023-12-02 14:52:20,221 INFO L87 Difference]: Start difference. First operand 68 states and 76 transitions. Second operand has 160 states, 160 states have (on average 1.11875) internal successors, (179), 160 states have internal predecessors, (179), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:52:43,609 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:52:43,609 INFO L93 Difference]: Finished difference Result 146 states and 167 transitions. [2023-12-02 14:52:43,609 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2023-12-02 14:52:43,609 INFO L78 Accepts]: Start accepts. Automaton has has 160 states, 160 states have (on average 1.11875) internal successors, (179), 160 states have internal predecessors, (179), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 67 [2023-12-02 14:52:43,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:52:43,611 INFO L225 Difference]: With dead ends: 146 [2023-12-02 14:52:43,611 INFO L226 Difference]: Without dead ends: 143 [2023-12-02 14:52:43,614 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 329 GetRequests, 102 SyntacticMatches, 0 SemanticMatches, 227 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12134 ImplicationChecksByTransitivity, 35.7s TimeCoverageRelationStatistics Valid=1752, Invalid=50460, Unknown=0, NotChecked=0, Total=52212 [2023-12-02 14:52:43,615 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 31 mSDsluCounter, 386 mSDsCounter, 0 mSdLazyCounter, 11052 mSolverCounterSat, 527 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 391 SdHoareTripleChecker+Invalid, 11579 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 527 IncrementalHoareTripleChecker+Valid, 11052 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 9.2s IncrementalHoareTripleChecker+Time [2023-12-02 14:52:43,615 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [31 Valid, 391 Invalid, 11579 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [527 Valid, 11052 Invalid, 0 Unknown, 0 Unchecked, 9.2s Time] [2023-12-02 14:52:43,615 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2023-12-02 14:52:43,712 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 91. [2023-12-02 14:52:43,712 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 90 states have (on average 1.1444444444444444) internal successors, (103), 90 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:52:43,712 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 103 transitions. [2023-12-02 14:52:43,712 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 103 transitions. Word has length 67 [2023-12-02 14:52:43,712 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:52:43,713 INFO L495 AbstractCegarLoop]: Abstraction has 91 states and 103 transitions. [2023-12-02 14:52:43,713 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 160 states, 160 states have (on average 1.11875) internal successors, (179), 160 states have internal predecessors, (179), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:52:43,713 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 103 transitions. [2023-12-02 14:52:43,713 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2023-12-02 14:52:43,713 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:52:43,713 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:52:43,719 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2023-12-02 14:52:43,914 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2023-12-02 14:52:43,914 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:52:43,914 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:52:43,915 INFO L85 PathProgramCache]: Analyzing trace with hash 1486465837, now seen corresponding path program 16 times [2023-12-02 14:52:43,915 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:52:43,915 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [517803561] [2023-12-02 14:52:43,915 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:52:43,915 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:52:43,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:52:44,163 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 22 proven. 27 refuted. 0 times theorem prover too weak. 147 trivial. 0 not checked. [2023-12-02 14:52:44,164 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:52:44,164 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [517803561] [2023-12-02 14:52:44,164 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [517803561] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:52:44,164 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [559809506] [2023-12-02 14:52:44,164 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 14:52:44,164 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:52:44,164 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:52:44,165 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:52:44,166 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2023-12-02 14:52:44,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:52:44,285 INFO L262 TraceCheckSpWp]: Trace formula consists of 371 conjuncts, 16 conjunts are in the unsatisfiable core [2023-12-02 14:52:44,286 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:52:44,419 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 147 trivial. 0 not checked. [2023-12-02 14:52:44,419 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:52:44,540 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 147 trivial. 0 not checked. [2023-12-02 14:52:44,541 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [559809506] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:52:44,541 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1954828660] [2023-12-02 14:52:44,542 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 14:52:44,542 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:52:44,542 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:52:44,543 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:52:44,543 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:52:44,747 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 14:52:44,913 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10515#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 14:52:44,913 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 14:52:44,913 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:52:44,914 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 26 [2023-12-02 14:52:44,914 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1012628854] [2023-12-02 14:52:44,914 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:52:44,914 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2023-12-02 14:52:44,914 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:52:44,915 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2023-12-02 14:52:44,915 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=746, Unknown=0, NotChecked=0, Total=930 [2023-12-02 14:52:44,915 INFO L87 Difference]: Start difference. First operand 91 states and 103 transitions. Second operand has 26 states, 26 states have (on average 1.7307692307692308) internal successors, (45), 26 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:52:45,438 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:52:45,438 INFO L93 Difference]: Finished difference Result 224 states and 255 transitions. [2023-12-02 14:52:45,438 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2023-12-02 14:52:45,439 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.7307692307692308) internal successors, (45), 26 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 68 [2023-12-02 14:52:45,439 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:52:45,439 INFO L225 Difference]: With dead ends: 224 [2023-12-02 14:52:45,439 INFO L226 Difference]: Without dead ends: 92 [2023-12-02 14:52:45,440 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 219 GetRequests, 177 SyntacticMatches, 13 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 476 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=184, Invalid=746, Unknown=0, NotChecked=0, Total=930 [2023-12-02 14:52:45,440 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 18 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 427 mSolverCounterSat, 94 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 521 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 94 IncrementalHoareTripleChecker+Valid, 427 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 14:52:45,440 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 11 Invalid, 521 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [94 Valid, 427 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 14:52:45,441 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2023-12-02 14:52:45,550 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 92. [2023-12-02 14:52:45,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 91 states have (on average 1.1428571428571428) internal successors, (104), 91 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:52:45,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 104 transitions. [2023-12-02 14:52:45,551 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 104 transitions. Word has length 68 [2023-12-02 14:52:45,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:52:45,551 INFO L495 AbstractCegarLoop]: Abstraction has 92 states and 104 transitions. [2023-12-02 14:52:45,551 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.7307692307692308) internal successors, (45), 26 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:52:45,551 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 104 transitions. [2023-12-02 14:52:45,551 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2023-12-02 14:52:45,552 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:52:45,552 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:52:45,557 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2023-12-02 14:52:45,752 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2023-12-02 14:52:45,753 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:52:45,753 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:52:45,753 INFO L85 PathProgramCache]: Analyzing trace with hash -2126632682, now seen corresponding path program 17 times [2023-12-02 14:52:45,753 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:52:45,753 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1927719377] [2023-12-02 14:52:45,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:52:45,753 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:52:45,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:52:45,991 INFO L134 CoverageAnalysis]: Checked inductivity of 203 backedges. 15 proven. 34 refuted. 0 times theorem prover too weak. 154 trivial. 0 not checked. [2023-12-02 14:52:45,991 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:52:45,992 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1927719377] [2023-12-02 14:52:45,992 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1927719377] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:52:45,992 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [621277764] [2023-12-02 14:52:45,992 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 14:52:45,992 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:52:45,992 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:52:45,993 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:52:45,994 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2023-12-02 14:52:46,150 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2023-12-02 14:52:46,150 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 14:52:46,153 INFO L262 TraceCheckSpWp]: Trace formula consists of 380 conjuncts, 16 conjunts are in the unsatisfiable core [2023-12-02 14:52:46,154 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:52:46,376 INFO L134 CoverageAnalysis]: Checked inductivity of 203 backedges. 21 proven. 28 refuted. 0 times theorem prover too weak. 154 trivial. 0 not checked. [2023-12-02 14:52:46,377 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:52:46,533 INFO L134 CoverageAnalysis]: Checked inductivity of 203 backedges. 21 proven. 28 refuted. 0 times theorem prover too weak. 154 trivial. 0 not checked. [2023-12-02 14:52:46,533 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [621277764] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:52:46,533 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [22294993] [2023-12-02 14:52:46,535 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 14:52:46,535 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:52:46,535 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:52:46,535 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:52:46,535 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:52:46,740 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 14:52:46,891 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11579#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 14:52:46,892 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 14:52:46,892 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:52:46,892 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 32 [2023-12-02 14:52:46,892 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [130480605] [2023-12-02 14:52:46,892 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:52:46,893 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2023-12-02 14:52:46,893 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:52:46,893 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2023-12-02 14:52:46,893 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=201, Invalid=1059, Unknown=0, NotChecked=0, Total=1260 [2023-12-02 14:52:46,894 INFO L87 Difference]: Start difference. First operand 92 states and 104 transitions. Second operand has 32 states, 32 states have (on average 2.03125) internal successors, (65), 32 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:52:47,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:52:47,516 INFO L93 Difference]: Finished difference Result 152 states and 178 transitions. [2023-12-02 14:52:47,517 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2023-12-02 14:52:47,517 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.03125) internal successors, (65), 32 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 69 [2023-12-02 14:52:47,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:52:47,518 INFO L225 Difference]: With dead ends: 152 [2023-12-02 14:52:47,518 INFO L226 Difference]: Without dead ends: 77 [2023-12-02 14:52:47,518 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 237 GetRequests, 181 SyntacticMatches, 14 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 930 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=308, Invalid=1584, Unknown=0, NotChecked=0, Total=1892 [2023-12-02 14:52:47,519 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 37 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 739 mSolverCounterSat, 164 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 903 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 164 IncrementalHoareTripleChecker+Valid, 739 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 14:52:47,519 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [37 Valid, 19 Invalid, 903 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [164 Valid, 739 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 14:52:47,520 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2023-12-02 14:52:47,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2023-12-02 14:52:47,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 76 states have (on average 1.118421052631579) internal successors, (85), 76 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:52:47,613 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 85 transitions. [2023-12-02 14:52:47,614 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 85 transitions. Word has length 69 [2023-12-02 14:52:47,614 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:52:47,614 INFO L495 AbstractCegarLoop]: Abstraction has 77 states and 85 transitions. [2023-12-02 14:52:47,614 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 2.03125) internal successors, (65), 32 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:52:47,614 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 85 transitions. [2023-12-02 14:52:47,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2023-12-02 14:52:47,614 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:52:47,614 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:52:47,620 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2023-12-02 14:52:47,815 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:52:47,815 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:52:47,816 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:52:47,816 INFO L85 PathProgramCache]: Analyzing trace with hash -1226039085, now seen corresponding path program 18 times [2023-12-02 14:52:47,816 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:52:47,816 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [56500987] [2023-12-02 14:52:47,816 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:52:47,816 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:52:48,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:53:01,638 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 30 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:53:01,638 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:53:01,638 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [56500987] [2023-12-02 14:53:01,638 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [56500987] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:53:01,638 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1552464489] [2023-12-02 14:53:01,638 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 14:53:01,639 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:53:01,639 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:53:01,640 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:53:01,640 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2023-12-02 14:53:01,766 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 14:53:01,766 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 14:53:01,772 WARN L260 TraceCheckSpWp]: Trace formula consists of 415 conjuncts, 250 conjunts are in the unsatisfiable core [2023-12-02 14:53:01,777 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:53:01,893 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2023-12-02 14:53:06,608 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 252 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:53:06,608 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:53:23,248 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 224 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2023-12-02 14:53:23,248 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1552464489] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:53:23,249 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [930424925] [2023-12-02 14:53:23,250 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 14:53:23,250 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:53:23,250 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:53:23,250 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:53:23,250 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:53:23,429 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 14:53:24,471 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12668#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 14:53:24,471 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 14:53:24,471 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:53:24,471 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [75, 69, 64] total 167 [2023-12-02 14:53:24,471 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1871492843] [2023-12-02 14:53:24,471 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:53:24,472 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 167 states [2023-12-02 14:53:24,472 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:53:24,473 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 167 interpolants. [2023-12-02 14:53:24,474 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=671, Invalid=28741, Unknown=0, NotChecked=0, Total=29412 [2023-12-02 14:53:24,475 INFO L87 Difference]: Start difference. First operand 77 states and 85 transitions. Second operand has 167 states, 167 states have (on average 1.1077844311377245) internal successors, (185), 167 states have internal predecessors, (185), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:53:52,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:53:52,418 INFO L93 Difference]: Finished difference Result 162 states and 183 transitions. [2023-12-02 14:53:52,418 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2023-12-02 14:53:52,419 INFO L78 Accepts]: Start accepts. Automaton has has 167 states, 167 states have (on average 1.1077844311377245) internal successors, (185), 167 states have internal predecessors, (185), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 76 [2023-12-02 14:53:52,419 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:53:52,420 INFO L225 Difference]: With dead ends: 162 [2023-12-02 14:53:52,420 INFO L226 Difference]: Without dead ends: 159 [2023-12-02 14:53:52,422 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 374 GetRequests, 131 SyntacticMatches, 0 SemanticMatches, 243 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12929 ImplicationChecksByTransitivity, 42.2s TimeCoverageRelationStatistics Valid=2095, Invalid=57685, Unknown=0, NotChecked=0, Total=59780 [2023-12-02 14:53:52,422 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 23 mSDsluCounter, 404 mSDsCounter, 0 mSdLazyCounter, 12762 mSolverCounterSat, 499 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 409 SdHoareTripleChecker+Invalid, 13261 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 499 IncrementalHoareTripleChecker+Valid, 12762 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 10.8s IncrementalHoareTripleChecker+Time [2023-12-02 14:53:52,423 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 409 Invalid, 13261 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [499 Valid, 12762 Invalid, 0 Unknown, 0 Unchecked, 10.8s Time] [2023-12-02 14:53:52,423 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2023-12-02 14:53:52,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 103. [2023-12-02 14:53:52,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 102 states have (on average 1.1274509803921569) internal successors, (115), 102 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:53:52,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 115 transitions. [2023-12-02 14:53:52,564 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 115 transitions. Word has length 76 [2023-12-02 14:53:52,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:53:52,564 INFO L495 AbstractCegarLoop]: Abstraction has 103 states and 115 transitions. [2023-12-02 14:53:52,564 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 167 states, 167 states have (on average 1.1077844311377245) internal successors, (185), 167 states have internal predecessors, (185), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:53:52,565 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 115 transitions. [2023-12-02 14:53:52,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2023-12-02 14:53:52,565 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:53:52,565 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:53:52,572 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2023-12-02 14:53:52,765 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:53:52,766 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:53:52,766 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:53:52,766 INFO L85 PathProgramCache]: Analyzing trace with hash -65318677, now seen corresponding path program 19 times [2023-12-02 14:53:52,766 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:53:52,766 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1122708738] [2023-12-02 14:53:52,767 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:53:52,767 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:53:52,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:53:53,069 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 29 proven. 35 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2023-12-02 14:53:53,069 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:53:53,070 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1122708738] [2023-12-02 14:53:53,070 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1122708738] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:53:53,070 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1651153387] [2023-12-02 14:53:53,070 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 14:53:53,070 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:53:53,070 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:53:53,071 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:53:53,075 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2023-12-02 14:53:53,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:53:53,193 INFO L262 TraceCheckSpWp]: Trace formula consists of 420 conjuncts, 18 conjunts are in the unsatisfiable core [2023-12-02 14:53:53,195 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:53:53,386 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2023-12-02 14:53:53,386 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:53:53,537 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2023-12-02 14:53:53,537 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1651153387] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:53:53,537 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [451863626] [2023-12-02 14:53:53,539 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 14:53:53,539 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:53:53,539 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:53:53,539 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:53:53,539 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:53:53,729 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 14:53:53,909 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13818#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 14:53:53,909 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 14:53:53,909 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:53:53,909 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 29 [2023-12-02 14:53:53,910 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [982088612] [2023-12-02 14:53:53,910 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:53:53,910 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2023-12-02 14:53:53,910 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:53:53,911 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2023-12-02 14:53:53,911 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=232, Invalid=890, Unknown=0, NotChecked=0, Total=1122 [2023-12-02 14:53:53,911 INFO L87 Difference]: Start difference. First operand 103 states and 115 transitions. Second operand has 29 states, 29 states have (on average 1.6551724137931034) internal successors, (48), 29 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:53:54,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:53:54,537 INFO L93 Difference]: Finished difference Result 254 states and 285 transitions. [2023-12-02 14:53:54,537 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2023-12-02 14:53:54,538 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.6551724137931034) internal successors, (48), 29 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 77 [2023-12-02 14:53:54,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:53:54,539 INFO L225 Difference]: With dead ends: 254 [2023-12-02 14:53:54,539 INFO L226 Difference]: Without dead ends: 104 [2023-12-02 14:53:54,539 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 201 SyntacticMatches, 15 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 599 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=232, Invalid=890, Unknown=0, NotChecked=0, Total=1122 [2023-12-02 14:53:54,540 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 10 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 625 mSolverCounterSat, 101 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 726 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 101 IncrementalHoareTripleChecker+Valid, 625 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 14:53:54,540 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 17 Invalid, 726 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [101 Valid, 625 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 14:53:54,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2023-12-02 14:53:54,686 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 104. [2023-12-02 14:53:54,687 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 103 states have (on average 1.1262135922330097) internal successors, (116), 103 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:53:54,687 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 116 transitions. [2023-12-02 14:53:54,687 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 116 transitions. Word has length 77 [2023-12-02 14:53:54,687 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:53:54,687 INFO L495 AbstractCegarLoop]: Abstraction has 104 states and 116 transitions. [2023-12-02 14:53:54,687 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.6551724137931034) internal successors, (48), 29 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:53:54,687 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 116 transitions. [2023-12-02 14:53:54,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2023-12-02 14:53:54,688 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:53:54,688 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:53:54,694 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2023-12-02 14:53:54,888 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:53:54,889 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:53:54,889 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:53:54,889 INFO L85 PathProgramCache]: Analyzing trace with hash 2131454242, now seen corresponding path program 20 times [2023-12-02 14:53:54,889 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:53:54,889 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1550289592] [2023-12-02 14:53:54,889 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:53:54,889 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:53:54,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:53:55,173 INFO L134 CoverageAnalysis]: Checked inductivity of 268 backedges. 21 proven. 43 refuted. 0 times theorem prover too weak. 204 trivial. 0 not checked. [2023-12-02 14:53:55,173 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:53:55,173 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1550289592] [2023-12-02 14:53:55,173 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1550289592] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:53:55,173 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [546180973] [2023-12-02 14:53:55,173 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 14:53:55,174 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:53:55,174 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:53:55,174 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:53:55,175 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2023-12-02 14:53:55,350 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2023-12-02 14:53:55,350 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 14:53:55,353 INFO L262 TraceCheckSpWp]: Trace formula consists of 429 conjuncts, 18 conjunts are in the unsatisfiable core [2023-12-02 14:53:55,355 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:53:55,488 INFO L134 CoverageAnalysis]: Checked inductivity of 268 backedges. 28 proven. 36 refuted. 0 times theorem prover too weak. 204 trivial. 0 not checked. [2023-12-02 14:53:55,488 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:53:55,630 INFO L134 CoverageAnalysis]: Checked inductivity of 268 backedges. 28 proven. 36 refuted. 0 times theorem prover too weak. 204 trivial. 0 not checked. [2023-12-02 14:53:55,630 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [546180973] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:53:55,630 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1752973695] [2023-12-02 14:53:55,631 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 14:53:55,631 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:53:55,632 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:53:55,632 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:53:55,632 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:53:55,828 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 14:53:55,966 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15017#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 14:53:55,966 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 14:53:55,966 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:53:55,966 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 29 [2023-12-02 14:53:55,966 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1953001432] [2023-12-02 14:53:55,966 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:53:55,967 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2023-12-02 14:53:55,967 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:53:55,967 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2023-12-02 14:53:55,967 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=216, Invalid=906, Unknown=0, NotChecked=0, Total=1122 [2023-12-02 14:53:55,968 INFO L87 Difference]: Start difference. First operand 104 states and 116 transitions. Second operand has 29 states, 29 states have (on average 1.9655172413793103) internal successors, (57), 29 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:53:56,396 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:53:56,396 INFO L93 Difference]: Finished difference Result 171 states and 197 transitions. [2023-12-02 14:53:56,397 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2023-12-02 14:53:56,397 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.9655172413793103) internal successors, (57), 29 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 78 [2023-12-02 14:53:56,397 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:53:56,398 INFO L225 Difference]: With dead ends: 171 [2023-12-02 14:53:56,398 INFO L226 Difference]: Without dead ends: 86 [2023-12-02 14:53:56,399 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 252 GetRequests, 203 SyntacticMatches, 16 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 706 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=227, Invalid=963, Unknown=0, NotChecked=0, Total=1190 [2023-12-02 14:53:56,399 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 17 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 226 mSolverCounterSat, 213 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 439 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 213 IncrementalHoareTripleChecker+Valid, 226 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 14:53:56,400 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [17 Valid, 11 Invalid, 439 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [213 Valid, 226 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 14:53:56,400 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2023-12-02 14:53:56,527 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 86. [2023-12-02 14:53:56,528 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 85 states have (on average 1.1058823529411765) internal successors, (94), 85 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:53:56,528 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 94 transitions. [2023-12-02 14:53:56,528 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 94 transitions. Word has length 78 [2023-12-02 14:53:56,528 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:53:56,528 INFO L495 AbstractCegarLoop]: Abstraction has 86 states and 94 transitions. [2023-12-02 14:53:56,528 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.9655172413793103) internal successors, (57), 29 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:53:56,528 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 94 transitions. [2023-12-02 14:53:56,529 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2023-12-02 14:53:56,529 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:53:56,529 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:53:56,536 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2023-12-02 14:53:56,729 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:53:56,729 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:53:56,730 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:53:56,730 INFO L85 PathProgramCache]: Analyzing trace with hash 719892943, now seen corresponding path program 21 times [2023-12-02 14:53:56,730 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:53:56,730 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1420421076] [2023-12-02 14:53:56,730 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:53:56,730 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:53:57,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:54:20,603 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 36 proven. 288 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:54:20,603 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:54:20,603 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1420421076] [2023-12-02 14:54:20,603 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1420421076] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:54:20,603 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [525738468] [2023-12-02 14:54:20,603 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 14:54:20,604 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:54:20,604 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:54:20,604 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:54:20,605 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2023-12-02 14:54:20,762 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 14:54:20,762 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 14:54:20,768 WARN L260 TraceCheckSpWp]: Trace formula consists of 464 conjuncts, 286 conjunts are in the unsatisfiable core [2023-12-02 14:54:20,774 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:54:20,817 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2023-12-02 14:54:26,220 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:54:26,220 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:54:48,760 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 288 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-12-02 14:54:48,760 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [525738468] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:54:48,760 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1547194482] [2023-12-02 14:54:48,762 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 14:54:48,762 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:54:48,762 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:54:48,762 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:54:48,763 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:54:48,960 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 14:54:50,336 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16213#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 14:54:50,336 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 14:54:50,336 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:54:50,336 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [84, 78, 72] total 184 [2023-12-02 14:54:50,336 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1349465036] [2023-12-02 14:54:50,337 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:54:50,337 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 184 states [2023-12-02 14:54:50,337 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:54:50,339 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 184 interpolants. [2023-12-02 14:54:50,340 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=796, Invalid=34736, Unknown=0, NotChecked=0, Total=35532 [2023-12-02 14:54:50,341 INFO L87 Difference]: Start difference. First operand 86 states and 94 transitions. Second operand has 184 states, 184 states have (on average 1.0815217391304348) internal successors, (199), 184 states have internal predecessors, (199), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:55:25,425 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:55:25,425 INFO L93 Difference]: Finished difference Result 237 states and 263 transitions. [2023-12-02 14:55:25,425 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 115 states. [2023-12-02 14:55:25,426 INFO L78 Accepts]: Start accepts. Automaton has has 184 states, 184 states have (on average 1.0815217391304348) internal successors, (199), 184 states have internal predecessors, (199), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 85 [2023-12-02 14:55:25,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:55:25,429 INFO L225 Difference]: With dead ends: 237 [2023-12-02 14:55:25,429 INFO L226 Difference]: Without dead ends: 233 [2023-12-02 14:55:25,433 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 406 GetRequests, 150 SyntacticMatches, 0 SemanticMatches, 256 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14186 ImplicationChecksByTransitivity, 51.9s TimeCoverageRelationStatistics Valid=2125, Invalid=64181, Unknown=0, NotChecked=0, Total=66306 [2023-12-02 14:55:25,434 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 39 mSDsluCounter, 216 mSDsCounter, 0 mSdLazyCounter, 16457 mSolverCounterSat, 676 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 14.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 219 SdHoareTripleChecker+Invalid, 17133 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 676 IncrementalHoareTripleChecker+Valid, 16457 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 15.8s IncrementalHoareTripleChecker+Time [2023-12-02 14:55:25,434 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [39 Valid, 219 Invalid, 17133 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [676 Valid, 16457 Invalid, 0 Unknown, 0 Unchecked, 15.8s Time] [2023-12-02 14:55:25,435 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 233 states. [2023-12-02 14:55:25,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 233 to 189. [2023-12-02 14:55:25,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 189 states, 188 states have (on average 1.122340425531915) internal successors, (211), 188 states have internal predecessors, (211), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:55:25,820 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 211 transitions. [2023-12-02 14:55:25,820 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 211 transitions. Word has length 85 [2023-12-02 14:55:25,820 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:55:25,820 INFO L495 AbstractCegarLoop]: Abstraction has 189 states and 211 transitions. [2023-12-02 14:55:25,821 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 184 states, 184 states have (on average 1.0815217391304348) internal successors, (199), 184 states have internal predecessors, (199), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:55:25,821 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 211 transitions. [2023-12-02 14:55:25,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2023-12-02 14:55:25,821 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:55:25,821 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:55:25,826 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Ended with exit code 0 [2023-12-02 14:55:26,022 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:55:26,022 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:55:26,022 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:55:26,022 INFO L85 PathProgramCache]: Analyzing trace with hash -1684674486, now seen corresponding path program 22 times [2023-12-02 14:55:26,023 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:55:26,023 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2104227580] [2023-12-02 14:55:26,023 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:55:26,023 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:55:26,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:55:26,377 INFO L134 CoverageAnalysis]: Checked inductivity of 333 backedges. 37 proven. 44 refuted. 0 times theorem prover too weak. 252 trivial. 0 not checked. [2023-12-02 14:55:26,377 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:55:26,377 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2104227580] [2023-12-02 14:55:26,377 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2104227580] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:55:26,377 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [297703599] [2023-12-02 14:55:26,377 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 14:55:26,377 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:55:26,378 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:55:26,378 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:55:26,380 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2023-12-02 14:55:26,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:55:26,539 INFO L262 TraceCheckSpWp]: Trace formula consists of 469 conjuncts, 20 conjunts are in the unsatisfiable core [2023-12-02 14:55:26,541 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:55:26,741 INFO L134 CoverageAnalysis]: Checked inductivity of 333 backedges. 45 proven. 36 refuted. 0 times theorem prover too weak. 252 trivial. 0 not checked. [2023-12-02 14:55:26,742 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:55:26,895 INFO L134 CoverageAnalysis]: Checked inductivity of 333 backedges. 45 proven. 36 refuted. 0 times theorem prover too weak. 252 trivial. 0 not checked. [2023-12-02 14:55:26,895 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [297703599] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:55:26,895 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [745548428] [2023-12-02 14:55:26,897 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 14:55:26,897 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:55:26,897 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:55:26,897 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:55:26,897 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:55:27,103 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 14:55:27,291 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '17736#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 14:55:27,291 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 14:55:27,291 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:55:27,291 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 32 [2023-12-02 14:55:27,292 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1653102022] [2023-12-02 14:55:27,292 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:55:27,292 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2023-12-02 14:55:27,292 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:55:27,292 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2023-12-02 14:55:27,293 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=276, Invalid=1056, Unknown=0, NotChecked=0, Total=1332 [2023-12-02 14:55:27,293 INFO L87 Difference]: Start difference. First operand 189 states and 211 transitions. Second operand has 32 states, 32 states have (on average 1.59375) internal successors, (51), 32 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:55:28,263 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:55:28,263 INFO L93 Difference]: Finished difference Result 320 states and 355 transitions. [2023-12-02 14:55:28,263 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2023-12-02 14:55:28,264 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.59375) internal successors, (51), 32 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 86 [2023-12-02 14:55:28,264 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:55:28,265 INFO L225 Difference]: With dead ends: 320 [2023-12-02 14:55:28,265 INFO L226 Difference]: Without dead ends: 143 [2023-12-02 14:55:28,265 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 277 GetRequests, 225 SyntacticMatches, 17 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 728 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=276, Invalid=1056, Unknown=0, NotChecked=0, Total=1332 [2023-12-02 14:55:28,266 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 14 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 730 mSolverCounterSat, 107 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 837 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 107 IncrementalHoareTripleChecker+Valid, 730 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 14:55:28,266 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 17 Invalid, 837 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [107 Valid, 730 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 14:55:28,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2023-12-02 14:55:28,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 143. [2023-12-02 14:55:28,508 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 142 states have (on average 1.1126760563380282) internal successors, (158), 142 states have internal predecessors, (158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:55:28,508 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 158 transitions. [2023-12-02 14:55:28,508 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 158 transitions. Word has length 86 [2023-12-02 14:55:28,508 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:55:28,508 INFO L495 AbstractCegarLoop]: Abstraction has 143 states and 158 transitions. [2023-12-02 14:55:28,509 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 1.59375) internal successors, (51), 32 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:55:28,509 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 158 transitions. [2023-12-02 14:55:28,509 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2023-12-02 14:55:28,509 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:55:28,509 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:55:28,516 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2023-12-02 14:55:28,710 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2023-12-02 14:55:28,710 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:55:28,710 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:55:28,711 INFO L85 PathProgramCache]: Analyzing trace with hash -830931093, now seen corresponding path program 23 times [2023-12-02 14:55:28,711 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:55:28,711 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1260700313] [2023-12-02 14:55:28,711 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:55:28,711 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:55:28,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:55:29,080 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 28 proven. 53 refuted. 0 times theorem prover too weak. 261 trivial. 0 not checked. [2023-12-02 14:55:29,080 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:55:29,081 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1260700313] [2023-12-02 14:55:29,081 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1260700313] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:55:29,081 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1582505844] [2023-12-02 14:55:29,081 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 14:55:29,081 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:55:29,081 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:55:29,082 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:55:29,083 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2023-12-02 14:55:29,318 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2023-12-02 14:55:29,318 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 14:55:29,321 INFO L262 TraceCheckSpWp]: Trace formula consists of 478 conjuncts, 20 conjunts are in the unsatisfiable core [2023-12-02 14:55:29,323 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:55:29,638 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 36 proven. 45 refuted. 0 times theorem prover too weak. 261 trivial. 0 not checked. [2023-12-02 14:55:29,638 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:55:29,898 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 36 proven. 45 refuted. 0 times theorem prover too weak. 261 trivial. 0 not checked. [2023-12-02 14:55:29,898 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1582505844] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:55:29,898 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [294108239] [2023-12-02 14:55:29,899 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 14:55:29,900 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:55:29,900 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:55:29,900 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:55:29,900 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:55:30,101 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 14:55:30,278 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19210#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 14:55:30,278 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 14:55:30,278 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:55:30,279 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 40 [2023-12-02 14:55:30,279 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1567809943] [2023-12-02 14:55:30,279 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:55:30,279 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2023-12-02 14:55:30,279 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:55:30,280 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2023-12-02 14:55:30,280 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=298, Invalid=1594, Unknown=0, NotChecked=0, Total=1892 [2023-12-02 14:55:30,281 INFO L87 Difference]: Start difference. First operand 143 states and 158 transitions. Second operand has 40 states, 40 states have (on average 1.775) internal successors, (71), 40 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:55:31,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:55:31,041 INFO L93 Difference]: Finished difference Result 208 states and 236 transitions. [2023-12-02 14:55:31,041 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2023-12-02 14:55:31,042 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.775) internal successors, (71), 40 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 87 [2023-12-02 14:55:31,042 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:55:31,042 INFO L225 Difference]: With dead ends: 208 [2023-12-02 14:55:31,042 INFO L226 Difference]: Without dead ends: 95 [2023-12-02 14:55:31,043 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 290 GetRequests, 220 SyntacticMatches, 18 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1506 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=462, Invalid=2400, Unknown=0, NotChecked=0, Total=2862 [2023-12-02 14:55:31,043 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 66 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 727 mSolverCounterSat, 371 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 1098 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 371 IncrementalHoareTripleChecker+Valid, 727 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 14:55:31,044 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [66 Valid, 13 Invalid, 1098 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [371 Valid, 727 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 14:55:31,044 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2023-12-02 14:55:31,202 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 95. [2023-12-02 14:55:31,203 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 94 states have (on average 1.0957446808510638) internal successors, (103), 94 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:55:31,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 103 transitions. [2023-12-02 14:55:31,203 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 103 transitions. Word has length 87 [2023-12-02 14:55:31,203 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:55:31,203 INFO L495 AbstractCegarLoop]: Abstraction has 95 states and 103 transitions. [2023-12-02 14:55:31,204 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 1.775) internal successors, (71), 40 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:55:31,204 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 103 transitions. [2023-12-02 14:55:31,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2023-12-02 14:55:31,204 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:55:31,204 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:55:31,210 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2023-12-02 14:55:31,405 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2023-12-02 14:55:31,405 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:55:31,405 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:55:31,406 INFO L85 PathProgramCache]: Analyzing trace with hash 1601352467, now seen corresponding path program 24 times [2023-12-02 14:55:31,406 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:55:31,406 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2117546371] [2023-12-02 14:55:31,406 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:55:31,406 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:55:31,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:55:55,007 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 36 proven. 369 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:55:55,007 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:55:55,008 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2117546371] [2023-12-02 14:55:55,008 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2117546371] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:55:55,008 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [343457669] [2023-12-02 14:55:55,008 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 14:55:55,008 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:55:55,008 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:55:55,009 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:55:55,010 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2023-12-02 14:55:55,180 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 14:55:55,180 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 14:55:55,188 WARN L260 TraceCheckSpWp]: Trace formula consists of 513 conjuncts, 318 conjunts are in the unsatisfiable core [2023-12-02 14:55:55,194 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:55:55,815 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2023-12-02 14:56:05,718 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 0 proven. 405 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:56:05,718 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:56:39,229 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 0 proven. 360 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2023-12-02 14:56:39,229 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [343457669] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:56:39,230 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [10585674] [2023-12-02 14:56:39,231 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 14:56:39,231 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:56:39,231 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:56:39,231 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:56:39,231 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:56:39,434 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 14:56:41,025 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '20603#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 14:56:41,025 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 14:56:41,025 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:56:41,025 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [93, 87, 80] total 218 [2023-12-02 14:56:41,025 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [738176421] [2023-12-02 14:56:41,025 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:56:41,026 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 218 states [2023-12-02 14:56:41,026 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:56:41,027 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 218 interpolants. [2023-12-02 14:56:41,029 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=903, Invalid=48603, Unknown=0, NotChecked=0, Total=49506 [2023-12-02 14:56:41,030 INFO L87 Difference]: Start difference. First operand 95 states and 103 transitions. Second operand has 218 states, 218 states have (on average 1.0871559633027523) internal successors, (237), 218 states have internal predecessors, (237), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:57:35,141 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:57:35,141 INFO L93 Difference]: Finished difference Result 347 states and 386 transitions. [2023-12-02 14:57:35,142 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 158 states. [2023-12-02 14:57:35,142 INFO L78 Accepts]: Start accepts. Automaton has has 218 states, 218 states have (on average 1.0871559633027523) internal successors, (237), 218 states have internal predecessors, (237), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 94 [2023-12-02 14:57:35,142 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:57:35,143 INFO L225 Difference]: With dead ends: 347 [2023-12-02 14:57:35,144 INFO L226 Difference]: Without dead ends: 343 [2023-12-02 14:57:35,147 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 479 GetRequests, 152 SyntacticMatches, 0 SemanticMatches, 327 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22814 ImplicationChecksByTransitivity, 84.5s TimeCoverageRelationStatistics Valid=3678, Invalid=104234, Unknown=0, NotChecked=0, Total=107912 [2023-12-02 14:57:35,147 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 67 mSDsluCounter, 514 mSDsCounter, 0 mSdLazyCounter, 22578 mSolverCounterSat, 1012 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 18.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 519 SdHoareTripleChecker+Invalid, 23590 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 1012 IncrementalHoareTripleChecker+Valid, 22578 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 20.4s IncrementalHoareTripleChecker+Time [2023-12-02 14:57:35,147 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [67 Valid, 519 Invalid, 23590 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [1012 Valid, 22578 Invalid, 0 Unknown, 0 Unchecked, 20.4s Time] [2023-12-02 14:57:35,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 343 states. [2023-12-02 14:57:35,518 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 343 to 210. [2023-12-02 14:57:35,518 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 210 states, 209 states have (on average 1.1148325358851674) internal successors, (233), 209 states have internal predecessors, (233), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:57:35,519 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 210 states to 210 states and 233 transitions. [2023-12-02 14:57:35,519 INFO L78 Accepts]: Start accepts. Automaton has 210 states and 233 transitions. Word has length 94 [2023-12-02 14:57:35,519 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:57:35,519 INFO L495 AbstractCegarLoop]: Abstraction has 210 states and 233 transitions. [2023-12-02 14:57:35,519 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 218 states, 218 states have (on average 1.0871559633027523) internal successors, (237), 218 states have internal predecessors, (237), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:57:35,519 INFO L276 IsEmpty]: Start isEmpty. Operand 210 states and 233 transitions. [2023-12-02 14:57:35,520 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2023-12-02 14:57:35,520 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:57:35,520 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:57:35,525 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Ended with exit code 0 [2023-12-02 14:57:35,720 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2023-12-02 14:57:35,720 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:57:35,720 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:57:35,721 INFO L85 PathProgramCache]: Analyzing trace with hash -2045274642, now seen corresponding path program 25 times [2023-12-02 14:57:35,721 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:57:35,721 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [567513721] [2023-12-02 14:57:35,721 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:57:35,721 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:57:35,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:57:36,147 INFO L134 CoverageAnalysis]: Checked inductivity of 415 backedges. 46 proven. 54 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2023-12-02 14:57:36,147 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:57:36,147 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [567513721] [2023-12-02 14:57:36,147 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [567513721] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:57:36,147 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1423619543] [2023-12-02 14:57:36,147 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 14:57:36,148 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:57:36,148 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:57:36,148 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:57:36,149 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2023-12-02 14:57:36,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:57:36,294 INFO L262 TraceCheckSpWp]: Trace formula consists of 518 conjuncts, 22 conjunts are in the unsatisfiable core [2023-12-02 14:57:36,296 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:57:36,500 INFO L134 CoverageAnalysis]: Checked inductivity of 415 backedges. 55 proven. 45 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2023-12-02 14:57:36,500 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:57:36,694 INFO L134 CoverageAnalysis]: Checked inductivity of 415 backedges. 55 proven. 45 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2023-12-02 14:57:36,694 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1423619543] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:57:36,695 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1205108171] [2023-12-02 14:57:36,695 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 14:57:36,696 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:57:36,696 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:57:36,696 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:57:36,696 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:57:36,907 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 14:57:37,062 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '22516#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 14:57:37,063 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 14:57:37,063 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:57:37,063 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 35 [2023-12-02 14:57:37,063 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [663320443] [2023-12-02 14:57:37,063 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:57:37,063 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2023-12-02 14:57:37,063 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:57:37,064 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2023-12-02 14:57:37,064 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=313, Invalid=1247, Unknown=0, NotChecked=0, Total=1560 [2023-12-02 14:57:37,064 INFO L87 Difference]: Start difference. First operand 210 states and 233 transitions. Second operand has 35 states, 35 states have (on average 1.542857142857143) internal successors, (54), 35 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:57:37,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:57:37,971 INFO L93 Difference]: Finished difference Result 355 states and 391 transitions. [2023-12-02 14:57:37,972 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2023-12-02 14:57:37,972 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.542857142857143) internal successors, (54), 35 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 95 [2023-12-02 14:57:37,972 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:57:37,973 INFO L225 Difference]: With dead ends: 355 [2023-12-02 14:57:37,973 INFO L226 Difference]: Without dead ends: 159 [2023-12-02 14:57:37,974 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 306 GetRequests, 249 SyntacticMatches, 19 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 860 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=313, Invalid=1247, Unknown=0, NotChecked=0, Total=1560 [2023-12-02 14:57:37,974 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 4 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 804 mSolverCounterSat, 107 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 911 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 107 IncrementalHoareTripleChecker+Valid, 804 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 14:57:37,974 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 21 Invalid, 911 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [107 Valid, 804 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 14:57:37,975 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2023-12-02 14:57:38,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 159. [2023-12-02 14:57:38,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 159 states, 158 states have (on average 1.1075949367088607) internal successors, (175), 158 states have internal predecessors, (175), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:57:38,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 175 transitions. [2023-12-02 14:57:38,246 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 175 transitions. Word has length 95 [2023-12-02 14:57:38,246 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:57:38,246 INFO L495 AbstractCegarLoop]: Abstraction has 159 states and 175 transitions. [2023-12-02 14:57:38,246 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.542857142857143) internal successors, (54), 35 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:57:38,246 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 175 transitions. [2023-12-02 14:57:38,247 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2023-12-02 14:57:38,247 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:57:38,247 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:57:38,252 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Ended with exit code 0 [2023-12-02 14:57:38,447 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2023-12-02 14:57:38,447 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:57:38,448 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:57:38,448 INFO L85 PathProgramCache]: Analyzing trace with hash 1301279471, now seen corresponding path program 26 times [2023-12-02 14:57:38,448 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:57:38,448 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1902024246] [2023-12-02 14:57:38,448 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:57:38,448 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:57:38,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:57:38,798 INFO L134 CoverageAnalysis]: Checked inductivity of 425 backedges. 36 proven. 64 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2023-12-02 14:57:38,798 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:57:38,798 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1902024246] [2023-12-02 14:57:38,798 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1902024246] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:57:38,798 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [302837420] [2023-12-02 14:57:38,798 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 14:57:38,798 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:57:38,798 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:57:38,799 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:57:38,800 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2023-12-02 14:57:38,988 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2023-12-02 14:57:38,988 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 14:57:38,992 INFO L262 TraceCheckSpWp]: Trace formula consists of 527 conjuncts, 22 conjunts are in the unsatisfiable core [2023-12-02 14:57:38,994 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:57:39,296 INFO L134 CoverageAnalysis]: Checked inductivity of 425 backedges. 45 proven. 55 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2023-12-02 14:57:39,296 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:57:39,550 INFO L134 CoverageAnalysis]: Checked inductivity of 425 backedges. 45 proven. 55 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2023-12-02 14:57:39,550 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [302837420] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:57:39,550 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [711010787] [2023-12-02 14:57:39,552 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 14:57:39,552 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:57:39,552 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:57:39,552 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:57:39,552 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:57:39,746 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 14:57:39,903 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '24150#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 14:57:39,903 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 14:57:39,904 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:57:39,904 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 44 [2023-12-02 14:57:39,904 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [427041488] [2023-12-02 14:57:39,904 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:57:39,904 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2023-12-02 14:57:39,904 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:57:39,905 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2023-12-02 14:57:39,905 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=359, Invalid=1993, Unknown=0, NotChecked=0, Total=2352 [2023-12-02 14:57:39,905 INFO L87 Difference]: Start difference. First operand 159 states and 175 transitions. Second operand has 44 states, 44 states have (on average 1.7727272727272727) internal successors, (78), 44 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:57:40,724 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:57:40,724 INFO L93 Difference]: Finished difference Result 230 states and 259 transitions. [2023-12-02 14:57:40,724 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2023-12-02 14:57:40,724 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.7727272727272727) internal successors, (78), 44 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 96 [2023-12-02 14:57:40,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:57:40,725 INFO L225 Difference]: With dead ends: 230 [2023-12-02 14:57:40,725 INFO L226 Difference]: Without dead ends: 104 [2023-12-02 14:57:40,726 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 320 GetRequests, 242 SyntacticMatches, 20 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1905 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=556, Invalid=2984, Unknown=0, NotChecked=0, Total=3540 [2023-12-02 14:57:40,726 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 33 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 875 mSolverCounterSat, 477 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 1352 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 477 IncrementalHoareTripleChecker+Valid, 875 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-12-02 14:57:40,726 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [33 Valid, 19 Invalid, 1352 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [477 Valid, 875 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-12-02 14:57:40,727 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2023-12-02 14:57:40,902 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 104. [2023-12-02 14:57:40,902 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 103 states have (on average 1.087378640776699) internal successors, (112), 103 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:57:40,903 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 112 transitions. [2023-12-02 14:57:40,903 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 112 transitions. Word has length 96 [2023-12-02 14:57:40,903 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:57:40,903 INFO L495 AbstractCegarLoop]: Abstraction has 104 states and 112 transitions. [2023-12-02 14:57:40,903 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 1.7727272727272727) internal successors, (78), 44 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:57:40,903 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 112 transitions. [2023-12-02 14:57:40,904 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2023-12-02 14:57:40,904 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:57:40,904 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:57:40,910 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2023-12-02 14:57:41,104 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2023-12-02 14:57:41,104 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:57:41,105 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:57:41,105 INFO L85 PathProgramCache]: Analyzing trace with hash -926040945, now seen corresponding path program 27 times [2023-12-02 14:57:41,105 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:57:41,105 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [755532471] [2023-12-02 14:57:41,105 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:57:41,105 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:57:41,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:58:05,903 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 36 proven. 459 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:58:05,904 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:58:05,904 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [755532471] [2023-12-02 14:58:05,904 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [755532471] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:58:05,904 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [44263794] [2023-12-02 14:58:05,904 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 14:58:05,904 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:58:05,904 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:58:05,905 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:58:05,906 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2023-12-02 14:58:06,089 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 14:58:06,089 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 14:58:06,097 WARN L260 TraceCheckSpWp]: Trace formula consists of 562 conjuncts, 354 conjunts are in the unsatisfiable core [2023-12-02 14:58:06,102 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:58:06,882 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2023-12-02 14:58:17,801 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:58:17,802 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:58:54,878 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 440 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2023-12-02 14:58:54,878 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [44263794] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:58:54,878 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1683071908] [2023-12-02 14:58:54,879 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 14:58:54,879 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:58:54,879 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:58:54,879 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:58:54,879 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:58:55,051 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 14:58:56,801 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '25684#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 14:58:56,801 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 14:58:56,801 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:58:56,801 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [102, 96, 88] total 240 [2023-12-02 14:58:56,801 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [819989418] [2023-12-02 14:58:56,801 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:58:56,802 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 240 states [2023-12-02 14:58:56,802 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:58:56,804 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 240 interpolants. [2023-12-02 14:58:56,806 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1031, Invalid=58749, Unknown=0, NotChecked=0, Total=59780 [2023-12-02 14:58:56,806 INFO L87 Difference]: Start difference. First operand 104 states and 112 transitions. Second operand has 240 states, 240 states have (on average 1.0791666666666666) internal successors, (259), 240 states have internal predecessors, (259), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:00:14,924 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:00:14,924 INFO L93 Difference]: Finished difference Result 384 states and 426 transitions. [2023-12-02 15:00:14,925 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 176 states. [2023-12-02 15:00:14,925 INFO L78 Accepts]: Start accepts. Automaton has has 240 states, 240 states have (on average 1.0791666666666666) internal successors, (259), 240 states have internal predecessors, (259), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 103 [2023-12-02 15:00:14,925 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:00:14,927 INFO L225 Difference]: With dead ends: 384 [2023-12-02 15:00:14,927 INFO L226 Difference]: Without dead ends: 380 [2023-12-02 15:00:14,949 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 527 GetRequests, 166 SyntacticMatches, 0 SemanticMatches, 361 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28073 ImplicationChecksByTransitivity, 107.9s TimeCoverageRelationStatistics Valid=4429, Invalid=126977, Unknown=0, NotChecked=0, Total=131406 [2023-12-02 15:00:14,950 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 87 mSDsluCounter, 864 mSDsCounter, 0 mSdLazyCounter, 28170 mSolverCounterSat, 1152 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 23.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 871 SdHoareTripleChecker+Invalid, 29322 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 1152 IncrementalHoareTripleChecker+Valid, 28170 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 26.3s IncrementalHoareTripleChecker+Time [2023-12-02 15:00:14,950 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [87 Valid, 871 Invalid, 29322 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [1152 Valid, 28170 Invalid, 0 Unknown, 0 Unchecked, 26.3s Time] [2023-12-02 15:00:14,950 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 380 states. [2023-12-02 15:00:15,447 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 380 to 229. [2023-12-02 15:00:15,448 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 229 states, 228 states have (on average 1.1008771929824561) internal successors, (251), 228 states have internal predecessors, (251), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:00:15,448 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 229 states to 229 states and 251 transitions. [2023-12-02 15:00:15,448 INFO L78 Accepts]: Start accepts. Automaton has 229 states and 251 transitions. Word has length 103 [2023-12-02 15:00:15,449 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:00:15,449 INFO L495 AbstractCegarLoop]: Abstraction has 229 states and 251 transitions. [2023-12-02 15:00:15,449 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 240 states, 240 states have (on average 1.0791666666666666) internal successors, (259), 240 states have internal predecessors, (259), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:00:15,449 INFO L276 IsEmpty]: Start isEmpty. Operand 229 states and 251 transitions. [2023-12-02 15:00:15,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2023-12-02 15:00:15,450 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:00:15,450 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 15:00:15,455 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Ended with exit code 0 [2023-12-02 15:00:15,650 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2023-12-02 15:00:15,650 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:00:15,651 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:00:15,651 INFO L85 PathProgramCache]: Analyzing trace with hash 179584266, now seen corresponding path program 28 times [2023-12-02 15:00:15,651 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:00:15,651 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1257460989] [2023-12-02 15:00:15,651 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:00:15,651 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:00:15,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:00:16,109 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 56 proven. 65 refuted. 0 times theorem prover too weak. 385 trivial. 0 not checked. [2023-12-02 15:00:16,109 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:00:16,109 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1257460989] [2023-12-02 15:00:16,109 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1257460989] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:00:16,109 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2146788905] [2023-12-02 15:00:16,109 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 15:00:16,109 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:00:16,110 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:00:16,110 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:00:16,111 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2023-12-02 15:00:16,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:00:16,273 INFO L262 TraceCheckSpWp]: Trace formula consists of 567 conjuncts, 24 conjunts are in the unsatisfiable core [2023-12-02 15:00:16,275 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:00:16,532 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 66 proven. 55 refuted. 0 times theorem prover too weak. 385 trivial. 0 not checked. [2023-12-02 15:00:16,532 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 15:00:16,712 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 66 proven. 55 refuted. 0 times theorem prover too weak. 385 trivial. 0 not checked. [2023-12-02 15:00:16,712 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2146788905] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 15:00:16,712 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [500930078] [2023-12-02 15:00:16,713 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 15:00:16,713 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 15:00:16,713 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 15:00:16,713 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 15:00:16,713 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 15:00:16,888 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 15:00:17,049 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '27784#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 15:00:17,049 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 15:00:17,049 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 15:00:17,049 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 38 [2023-12-02 15:00:17,049 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2012664427] [2023-12-02 15:00:17,050 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 15:00:17,050 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2023-12-02 15:00:17,050 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:00:17,051 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2023-12-02 15:00:17,051 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=376, Invalid=1430, Unknown=0, NotChecked=0, Total=1806 [2023-12-02 15:00:17,051 INFO L87 Difference]: Start difference. First operand 229 states and 251 transitions. Second operand has 38 states, 38 states have (on average 1.5) internal successors, (57), 38 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:00:18,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:00:18,240 INFO L93 Difference]: Finished difference Result 388 states and 423 transitions. [2023-12-02 15:00:18,240 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2023-12-02 15:00:18,241 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.5) internal successors, (57), 38 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 104 [2023-12-02 15:00:18,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:00:18,242 INFO L225 Difference]: With dead ends: 388 [2023-12-02 15:00:18,242 INFO L226 Difference]: Without dead ends: 173 [2023-12-02 15:00:18,242 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 335 GetRequests, 273 SyntacticMatches, 21 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1022 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=376, Invalid=1430, Unknown=0, NotChecked=0, Total=1806 [2023-12-02 15:00:18,243 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 21 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 683 mSolverCounterSat, 122 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 805 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 122 IncrementalHoareTripleChecker+Valid, 683 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 15:00:18,243 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [21 Valid, 9 Invalid, 805 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [122 Valid, 683 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 15:00:18,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2023-12-02 15:00:18,616 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 173. [2023-12-02 15:00:18,616 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 173 states, 172 states have (on average 1.0930232558139534) internal successors, (188), 172 states have internal predecessors, (188), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:00:18,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 188 transitions. [2023-12-02 15:00:18,617 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 188 transitions. Word has length 104 [2023-12-02 15:00:18,617 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:00:18,617 INFO L495 AbstractCegarLoop]: Abstraction has 173 states and 188 transitions. [2023-12-02 15:00:18,617 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 1.5) internal successors, (57), 38 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:00:18,617 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 188 transitions. [2023-12-02 15:00:18,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2023-12-02 15:00:18,618 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:00:18,618 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 15:00:18,623 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Ended with exit code 0 [2023-12-02 15:00:18,818 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:00:18,819 INFO L420 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:00:18,819 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:00:18,819 INFO L85 PathProgramCache]: Analyzing trace with hash -1742136789, now seen corresponding path program 29 times [2023-12-02 15:00:18,819 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:00:18,819 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1447667602] [2023-12-02 15:00:18,819 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:00:18,819 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:00:18,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:00:19,248 INFO L134 CoverageAnalysis]: Checked inductivity of 517 backedges. 45 proven. 76 refuted. 0 times theorem prover too weak. 396 trivial. 0 not checked. [2023-12-02 15:00:19,248 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:00:19,248 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1447667602] [2023-12-02 15:00:19,248 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1447667602] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:00:19,248 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1032618695] [2023-12-02 15:00:19,248 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 15:00:19,249 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:00:19,249 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:00:19,249 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:00:19,250 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2023-12-02 15:00:19,531 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2023-12-02 15:00:19,531 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 15:00:19,535 INFO L262 TraceCheckSpWp]: Trace formula consists of 576 conjuncts, 24 conjunts are in the unsatisfiable core [2023-12-02 15:00:19,537 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:00:19,956 INFO L134 CoverageAnalysis]: Checked inductivity of 517 backedges. 55 proven. 66 refuted. 0 times theorem prover too weak. 396 trivial. 0 not checked. [2023-12-02 15:00:19,956 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 15:00:20,291 INFO L134 CoverageAnalysis]: Checked inductivity of 517 backedges. 55 proven. 66 refuted. 0 times theorem prover too weak. 396 trivial. 0 not checked. [2023-12-02 15:00:20,291 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1032618695] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 15:00:20,291 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1000961470] [2023-12-02 15:00:20,292 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 15:00:20,292 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 15:00:20,292 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 15:00:20,292 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 15:00:20,292 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 15:00:20,468 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 15:00:20,637 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '29570#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 15:00:20,637 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 15:00:20,638 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 15:00:20,638 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 48 [2023-12-02 15:00:20,638 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2019462873] [2023-12-02 15:00:20,638 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 15:00:20,638 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2023-12-02 15:00:20,639 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:00:20,639 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2023-12-02 15:00:20,640 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=415, Invalid=2237, Unknown=0, NotChecked=0, Total=2652 [2023-12-02 15:00:20,640 INFO L87 Difference]: Start difference. First operand 173 states and 188 transitions. Second operand has 48 states, 48 states have (on average 1.8958333333333333) internal successors, (91), 48 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:00:21,718 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:00:21,718 INFO L93 Difference]: Finished difference Result 249 states and 276 transitions. [2023-12-02 15:00:21,718 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2023-12-02 15:00:21,718 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 1.8958333333333333) internal successors, (91), 48 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 105 [2023-12-02 15:00:21,718 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:00:21,719 INFO L225 Difference]: With dead ends: 249 [2023-12-02 15:00:21,719 INFO L226 Difference]: Without dead ends: 113 [2023-12-02 15:00:21,719 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 350 GetRequests, 266 SyntacticMatches, 22 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2218 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=648, Invalid=3384, Unknown=0, NotChecked=0, Total=4032 [2023-12-02 15:00:21,720 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 14 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 1143 mSolverCounterSat, 390 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 1533 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 390 IncrementalHoareTripleChecker+Valid, 1143 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-12-02 15:00:21,720 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 23 Invalid, 1533 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [390 Valid, 1143 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-12-02 15:00:21,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2023-12-02 15:00:21,950 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 113. [2023-12-02 15:00:21,950 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 113 states, 112 states have (on average 1.0803571428571428) internal successors, (121), 112 states have internal predecessors, (121), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:00:21,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 121 transitions. [2023-12-02 15:00:21,950 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 121 transitions. Word has length 105 [2023-12-02 15:00:21,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:00:21,951 INFO L495 AbstractCegarLoop]: Abstraction has 113 states and 121 transitions. [2023-12-02 15:00:21,951 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 1.8958333333333333) internal successors, (91), 48 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:00:21,951 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 121 transitions. [2023-12-02 15:00:21,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2023-12-02 15:00:21,951 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:00:21,951 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 11, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 15:00:21,957 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Ended with exit code 0 [2023-12-02 15:00:22,151 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:00:22,152 INFO L420 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:00:22,152 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:00:22,152 INFO L85 PathProgramCache]: Analyzing trace with hash -572611245, now seen corresponding path program 30 times [2023-12-02 15:00:22,152 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:00:22,152 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1261555834] [2023-12-02 15:00:22,152 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:00:22,152 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:00:22,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:00:53,467 INFO L134 CoverageAnalysis]: Checked inductivity of 594 backedges. 57 proven. 537 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 15:00:53,467 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:00:53,467 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1261555834] [2023-12-02 15:00:53,467 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1261555834] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:00:53,467 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [859411813] [2023-12-02 15:00:53,467 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 15:00:53,467 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:00:53,467 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:00:53,468 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:00:53,469 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2023-12-02 15:00:53,667 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 15:00:53,667 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 15:00:53,674 WARN L260 TraceCheckSpWp]: Trace formula consists of 611 conjuncts, 386 conjunts are in the unsatisfiable core [2023-12-02 15:00:53,680 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:00:54,625 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2023-12-02 15:01:07,542 INFO L134 CoverageAnalysis]: Checked inductivity of 594 backedges. 0 proven. 594 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 15:01:07,542 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 15:01:47,331 INFO L134 CoverageAnalysis]: Checked inductivity of 594 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2023-12-02 15:01:47,331 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [859411813] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 15:01:47,331 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2054195090] [2023-12-02 15:01:47,332 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 15:01:47,332 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 15:01:47,332 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 15:01:47,332 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 15:01:47,332 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 15:01:47,496 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 15:01:49,155 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '31239#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 15:01:49,155 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 15:01:49,155 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 15:01:49,156 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [111, 105, 96] total 264 [2023-12-02 15:01:49,156 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [615280868] [2023-12-02 15:01:49,156 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 15:01:49,156 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 264 states [2023-12-02 15:01:49,156 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:01:49,158 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 264 interpolants. [2023-12-02 15:01:49,160 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1359, Invalid=70733, Unknown=0, NotChecked=0, Total=72092 [2023-12-02 15:01:49,161 INFO L87 Difference]: Start difference. First operand 113 states and 121 transitions. Second operand has 264 states, 264 states have (on average 1.071969696969697) internal successors, (283), 264 states have internal predecessors, (283), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:03:13,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:03:13,302 INFO L93 Difference]: Finished difference Result 331 states and 362 transitions. [2023-12-02 15:03:13,302 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 163 states. [2023-12-02 15:03:13,302 INFO L78 Accepts]: Start accepts. Automaton has has 264 states, 264 states have (on average 1.071969696969697) internal successors, (283), 264 states have internal predecessors, (283), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 112 [2023-12-02 15:03:13,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:03:13,304 INFO L225 Difference]: With dead ends: 331 [2023-12-02 15:03:13,304 INFO L226 Difference]: Without dead ends: 327 [2023-12-02 15:03:13,310 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 583 GetRequests, 178 SyntacticMatches, 0 SemanticMatches, 405 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43198 ImplicationChecksByTransitivity, 115.0s TimeCoverageRelationStatistics Valid=5220, Invalid=160022, Unknown=0, NotChecked=0, Total=165242 [2023-12-02 15:03:13,310 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 83 mSDsluCounter, 617 mSDsCounter, 0 mSdLazyCounter, 32321 mSolverCounterSat, 1638 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 28.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 83 SdHoareTripleChecker+Valid, 622 SdHoareTripleChecker+Invalid, 33959 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 1638 IncrementalHoareTripleChecker+Valid, 32321 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 31.0s IncrementalHoareTripleChecker+Time [2023-12-02 15:03:13,311 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [83 Valid, 622 Invalid, 33959 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [1638 Valid, 32321 Invalid, 0 Unknown, 0 Unchecked, 31.0s Time] [2023-12-02 15:03:13,311 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 327 states. [2023-12-02 15:03:13,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 327 to 201. [2023-12-02 15:03:13,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 201 states, 200 states have (on average 1.095) internal successors, (219), 200 states have internal predecessors, (219), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:03:13,784 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 219 transitions. [2023-12-02 15:03:13,784 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 219 transitions. Word has length 112 [2023-12-02 15:03:13,784 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:03:13,784 INFO L495 AbstractCegarLoop]: Abstraction has 201 states and 219 transitions. [2023-12-02 15:03:13,784 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 264 states, 264 states have (on average 1.071969696969697) internal successors, (283), 264 states have internal predecessors, (283), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:03:13,785 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 219 transitions. [2023-12-02 15:03:13,785 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2023-12-02 15:03:13,785 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:03:13,785 INFO L195 NwaCegarLoop]: trace histogram [12, 11, 11, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 15:03:13,790 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Ended with exit code 0 [2023-12-02 15:03:13,985 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2023-12-02 15:03:13,986 INFO L420 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:03:13,986 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:03:13,986 INFO L85 PathProgramCache]: Analyzing trace with hash -1698388245, now seen corresponding path program 31 times [2023-12-02 15:03:13,986 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:03:13,986 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [356648108] [2023-12-02 15:03:13,987 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:03:13,987 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:03:14,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:03:14,496 INFO L134 CoverageAnalysis]: Checked inductivity of 606 backedges. 67 proven. 77 refuted. 0 times theorem prover too weak. 462 trivial. 0 not checked. [2023-12-02 15:03:14,496 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:03:14,497 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [356648108] [2023-12-02 15:03:14,497 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [356648108] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:03:14,497 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [413492504] [2023-12-02 15:03:14,497 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 15:03:14,497 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:03:14,497 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:03:14,498 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:03:14,499 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2023-12-02 15:03:14,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:03:14,696 INFO L262 TraceCheckSpWp]: Trace formula consists of 616 conjuncts, 26 conjunts are in the unsatisfiable core [2023-12-02 15:03:14,698 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:03:14,990 INFO L134 CoverageAnalysis]: Checked inductivity of 606 backedges. 78 proven. 66 refuted. 0 times theorem prover too weak. 462 trivial. 0 not checked. [2023-12-02 15:03:14,990 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 15:03:15,209 INFO L134 CoverageAnalysis]: Checked inductivity of 606 backedges. 78 proven. 66 refuted. 0 times theorem prover too weak. 462 trivial. 0 not checked. [2023-12-02 15:03:15,210 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [413492504] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 15:03:15,210 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1945087633] [2023-12-02 15:03:15,211 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 15:03:15,211 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 15:03:15,211 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 15:03:15,211 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 15:03:15,211 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 15:03:15,374 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 15:03:15,544 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '33280#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 15:03:15,544 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 15:03:15,544 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 15:03:15,545 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 41 [2023-12-02 15:03:15,545 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [909104960] [2023-12-02 15:03:15,545 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 15:03:15,545 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2023-12-02 15:03:15,545 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:03:15,546 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2023-12-02 15:03:15,546 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=432, Invalid=1638, Unknown=0, NotChecked=0, Total=2070 [2023-12-02 15:03:15,546 INFO L87 Difference]: Start difference. First operand 201 states and 219 transitions. Second operand has 41 states, 41 states have (on average 1.4634146341463414) internal successors, (60), 41 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:03:16,699 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:03:16,699 INFO L93 Difference]: Finished difference Result 399 states and 433 transitions. [2023-12-02 15:03:16,699 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2023-12-02 15:03:16,699 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.4634146341463414) internal successors, (60), 41 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 113 [2023-12-02 15:03:16,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:03:16,700 INFO L225 Difference]: With dead ends: 399 [2023-12-02 15:03:16,700 INFO L226 Difference]: Without dead ends: 152 [2023-12-02 15:03:16,701 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 364 GetRequests, 297 SyntacticMatches, 23 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1187 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=432, Invalid=1638, Unknown=0, NotChecked=0, Total=2070 [2023-12-02 15:03:16,701 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 8 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 1029 mSolverCounterSat, 158 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 1187 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 158 IncrementalHoareTripleChecker+Valid, 1029 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 15:03:16,702 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 23 Invalid, 1187 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [158 Valid, 1029 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 15:03:16,702 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2023-12-02 15:03:17,056 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 152. [2023-12-02 15:03:17,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 152 states, 151 states have (on average 1.086092715231788) internal successors, (164), 151 states have internal predecessors, (164), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:03:17,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 164 transitions. [2023-12-02 15:03:17,057 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 164 transitions. Word has length 113 [2023-12-02 15:03:17,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:03:17,057 INFO L495 AbstractCegarLoop]: Abstraction has 152 states and 164 transitions. [2023-12-02 15:03:17,057 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 1.4634146341463414) internal successors, (60), 41 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:03:17,057 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 164 transitions. [2023-12-02 15:03:17,057 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2023-12-02 15:03:17,057 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:03:17,058 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 11, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 15:03:17,064 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Ended with exit code 0 [2023-12-02 15:03:17,258 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2023-12-02 15:03:17,258 INFO L420 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:03:17,258 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:03:17,258 INFO L85 PathProgramCache]: Analyzing trace with hash 1519857570, now seen corresponding path program 32 times [2023-12-02 15:03:17,259 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:03:17,259 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [218167134] [2023-12-02 15:03:17,259 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:03:17,259 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:03:17,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:03:17,728 INFO L134 CoverageAnalysis]: Checked inductivity of 618 backedges. 55 proven. 89 refuted. 0 times theorem prover too weak. 474 trivial. 0 not checked. [2023-12-02 15:03:17,729 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:03:17,729 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [218167134] [2023-12-02 15:03:17,729 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [218167134] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:03:17,729 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [374626038] [2023-12-02 15:03:17,729 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 15:03:17,729 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:03:17,729 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:03:17,730 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:03:17,731 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2023-12-02 15:03:18,072 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2023-12-02 15:03:18,072 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 15:03:18,076 INFO L262 TraceCheckSpWp]: Trace formula consists of 625 conjuncts, 26 conjunts are in the unsatisfiable core [2023-12-02 15:03:18,079 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:03:18,305 INFO L134 CoverageAnalysis]: Checked inductivity of 618 backedges. 66 proven. 78 refuted. 0 times theorem prover too weak. 474 trivial. 0 not checked. [2023-12-02 15:03:18,305 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 15:03:18,533 INFO L134 CoverageAnalysis]: Checked inductivity of 618 backedges. 66 proven. 78 refuted. 0 times theorem prover too weak. 474 trivial. 0 not checked. [2023-12-02 15:03:18,533 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [374626038] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 15:03:18,533 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [107745140] [2023-12-02 15:03:18,534 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 15:03:18,534 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 15:03:18,534 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 15:03:18,534 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 15:03:18,534 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 15:03:18,695 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 15:03:18,878 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '35093#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 15:03:18,879 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 15:03:18,879 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 15:03:18,879 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 41 [2023-12-02 15:03:18,879 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [28568360] [2023-12-02 15:03:18,879 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 15:03:18,880 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2023-12-02 15:03:18,880 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:03:18,880 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2023-12-02 15:03:18,880 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=408, Invalid=1662, Unknown=0, NotChecked=0, Total=2070 [2023-12-02 15:03:18,881 INFO L87 Difference]: Start difference. First operand 152 states and 164 transitions. Second operand has 41 states, 41 states have (on average 1.7804878048780488) internal successors, (73), 41 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:03:19,544 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:03:19,544 INFO L93 Difference]: Finished difference Result 247 states and 273 transitions. [2023-12-02 15:03:19,544 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2023-12-02 15:03:19,545 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.7804878048780488) internal successors, (73), 41 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 114 [2023-12-02 15:03:19,545 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:03:19,545 INFO L225 Difference]: With dead ends: 247 [2023-12-02 15:03:19,545 INFO L226 Difference]: Without dead ends: 122 [2023-12-02 15:03:19,546 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 368 GetRequests, 299 SyntacticMatches, 24 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1424 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=423, Invalid=1739, Unknown=0, NotChecked=0, Total=2162 [2023-12-02 15:03:19,546 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 29 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 345 mSolverCounterSat, 372 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 717 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 372 IncrementalHoareTripleChecker+Valid, 345 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 15:03:19,546 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [29 Valid, 17 Invalid, 717 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [372 Valid, 345 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 15:03:19,547 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2023-12-02 15:03:19,879 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 122. [2023-12-02 15:03:19,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 121 states have (on average 1.0743801652892562) internal successors, (130), 121 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:03:19,880 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 130 transitions. [2023-12-02 15:03:19,880 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 130 transitions. Word has length 114 [2023-12-02 15:03:19,880 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:03:19,880 INFO L495 AbstractCegarLoop]: Abstraction has 122 states and 130 transitions. [2023-12-02 15:03:19,880 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 1.7804878048780488) internal successors, (73), 41 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:03:19,880 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 130 transitions. [2023-12-02 15:03:19,881 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2023-12-02 15:03:19,881 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:03:19,881 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 12, 12, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 15:03:19,887 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Ended with exit code 0 [2023-12-02 15:03:20,081 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2023-12-02 15:03:20,082 INFO L420 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:03:20,082 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:03:20,082 INFO L85 PathProgramCache]: Analyzing trace with hash 145254223, now seen corresponding path program 33 times [2023-12-02 15:03:20,082 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:03:20,082 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [232427540] [2023-12-02 15:03:20,082 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:03:20,082 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:03:20,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:03:54,294 INFO L134 CoverageAnalysis]: Checked inductivity of 702 backedges. 63 proven. 639 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 15:03:54,294 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:03:54,295 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [232427540] [2023-12-02 15:03:54,295 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [232427540] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:03:54,295 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [780445316] [2023-12-02 15:03:54,295 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 15:03:54,295 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:03:54,295 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:03:54,296 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:03:54,296 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13a6f15d-2bdd-4d82-b869-f66b96580b10/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2023-12-02 15:03:54,491 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 15:03:54,492 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 15:03:54,499 WARN L260 TraceCheckSpWp]: Trace formula consists of 660 conjuncts, 422 conjunts are in the unsatisfiable core [2023-12-02 15:03:54,505 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:03:54,560 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2023-12-02 15:04:09,935 INFO L134 CoverageAnalysis]: Checked inductivity of 702 backedges. 0 proven. 702 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 15:04:09,935 INFO L327 TraceCheckSpWp]: Computing backward predicates...