./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-examples/standard_partition_ground-1.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version dbf71c69 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7752747b-73a4-448d-9e23-62f234213445/bin/utaipan-G1rejxKTta/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7752747b-73a4-448d-9e23-62f234213445/bin/utaipan-G1rejxKTta/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7752747b-73a4-448d-9e23-62f234213445/bin/utaipan-G1rejxKTta/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7752747b-73a4-448d-9e23-62f234213445/bin/utaipan-G1rejxKTta/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-examples/standard_partition_ground-1.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7752747b-73a4-448d-9e23-62f234213445/bin/utaipan-G1rejxKTta/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7752747b-73a4-448d-9e23-62f234213445/bin/utaipan-G1rejxKTta --witnessprinter.witness.filename witness.graphml --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 6c4a57140d9977d38b2a20d40c88df51a4fcb7b14a0fb7c51e0b4e36cddf9998 --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-dbf71c6-m [2022-10-17 17:38:55,503 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-10-17 17:38:55,506 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-10-17 17:38:55,560 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-10-17 17:38:55,561 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-10-17 17:38:55,565 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-10-17 17:38:55,568 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-10-17 17:38:55,573 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-10-17 17:38:55,576 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-10-17 17:38:55,582 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-10-17 17:38:55,583 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-10-17 17:38:55,586 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-10-17 17:38:55,586 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-10-17 17:38:55,589 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-10-17 17:38:55,591 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-10-17 17:38:55,593 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-10-17 17:38:55,595 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-10-17 17:38:55,596 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-10-17 17:38:55,598 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-10-17 17:38:55,605 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-10-17 17:38:55,607 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-10-17 17:38:55,609 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-10-17 17:38:55,612 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-10-17 17:38:55,613 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-10-17 17:38:55,623 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-10-17 17:38:55,624 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-10-17 17:38:55,624 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-10-17 17:38:55,626 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-10-17 17:38:55,627 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-10-17 17:38:55,628 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-10-17 17:38:55,628 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-10-17 17:38:55,629 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-10-17 17:38:55,631 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-10-17 17:38:55,632 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-10-17 17:38:55,633 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-10-17 17:38:55,634 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-10-17 17:38:55,634 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-10-17 17:38:55,635 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-10-17 17:38:55,635 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-10-17 17:38:55,636 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-10-17 17:38:55,636 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-10-17 17:38:55,638 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7752747b-73a4-448d-9e23-62f234213445/bin/utaipan-G1rejxKTta/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-10-17 17:38:55,681 INFO L113 SettingsManager]: Loading preferences was successful [2022-10-17 17:38:55,682 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-10-17 17:38:55,682 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-10-17 17:38:55,682 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-10-17 17:38:55,683 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-10-17 17:38:55,683 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-10-17 17:38:55,684 INFO L138 SettingsManager]: * User list type=DISABLED [2022-10-17 17:38:55,684 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-10-17 17:38:55,684 INFO L138 SettingsManager]: * Explicit value domain=true [2022-10-17 17:38:55,684 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-10-17 17:38:55,685 INFO L138 SettingsManager]: * Octagon Domain=false [2022-10-17 17:38:55,685 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-10-17 17:38:55,686 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-10-17 17:38:55,686 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-10-17 17:38:55,686 INFO L138 SettingsManager]: * Interval Domain=false [2022-10-17 17:38:55,686 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-10-17 17:38:55,686 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-10-17 17:38:55,687 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-10-17 17:38:55,687 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-10-17 17:38:55,688 INFO L138 SettingsManager]: * sizeof long=4 [2022-10-17 17:38:55,688 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-10-17 17:38:55,688 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-10-17 17:38:55,688 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-10-17 17:38:55,688 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-10-17 17:38:55,689 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-10-17 17:38:55,689 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-10-17 17:38:55,697 INFO L138 SettingsManager]: * sizeof long double=12 [2022-10-17 17:38:55,697 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-10-17 17:38:55,698 INFO L138 SettingsManager]: * Use constant arrays=true [2022-10-17 17:38:55,698 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-10-17 17:38:55,698 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-10-17 17:38:55,699 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-10-17 17:38:55,699 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-10-17 17:38:55,699 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-10-17 17:38:55,699 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-10-17 17:38:55,699 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-10-17 17:38:55,700 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-10-17 17:38:55,700 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-10-17 17:38:55,700 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-10-17 17:38:55,700 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-10-17 17:38:55,700 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-10-17 17:38:55,701 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode 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_7752747b-73a4-448d-9e23-62f234213445/bin/utaipan-G1rejxKTta/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7752747b-73a4-448d-9e23-62f234213445/bin/utaipan-G1rejxKTta Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 6c4a57140d9977d38b2a20d40c88df51a4fcb7b14a0fb7c51e0b4e36cddf9998 [2022-10-17 17:38:55,968 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-10-17 17:38:55,990 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-10-17 17:38:55,993 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-10-17 17:38:55,994 INFO L271 PluginConnector]: Initializing CDTParser... [2022-10-17 17:38:55,995 INFO L275 PluginConnector]: CDTParser initialized [2022-10-17 17:38:55,996 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7752747b-73a4-448d-9e23-62f234213445/bin/utaipan-G1rejxKTta/../../sv-benchmarks/c/array-examples/standard_partition_ground-1.i [2022-10-17 17:38:56,059 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7752747b-73a4-448d-9e23-62f234213445/bin/utaipan-G1rejxKTta/data/d23a5f094/90da249f628a4d9aaf491028c0b4dc0d/FLAGeb7e109dd [2022-10-17 17:38:56,502 INFO L306 CDTParser]: Found 1 translation units. [2022-10-17 17:38:56,503 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7752747b-73a4-448d-9e23-62f234213445/sv-benchmarks/c/array-examples/standard_partition_ground-1.i [2022-10-17 17:38:56,514 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7752747b-73a4-448d-9e23-62f234213445/bin/utaipan-G1rejxKTta/data/d23a5f094/90da249f628a4d9aaf491028c0b4dc0d/FLAGeb7e109dd [2022-10-17 17:38:56,897 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7752747b-73a4-448d-9e23-62f234213445/bin/utaipan-G1rejxKTta/data/d23a5f094/90da249f628a4d9aaf491028c0b4dc0d [2022-10-17 17:38:56,900 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-10-17 17:38:56,903 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-10-17 17:38:56,907 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-10-17 17:38:56,908 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-10-17 17:38:56,911 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-10-17 17:38:56,912 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.10 05:38:56" (1/1) ... [2022-10-17 17:38:56,913 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1d6431ed and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:38:56, skipping insertion in model container [2022-10-17 17:38:56,914 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.10 05:38:56" (1/1) ... [2022-10-17 17:38:56,922 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-10-17 17:38:56,941 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-10-17 17:38:57,130 WARN L230 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_7752747b-73a4-448d-9e23-62f234213445/sv-benchmarks/c/array-examples/standard_partition_ground-1.i[860,873] [2022-10-17 17:38:57,150 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-10-17 17:38:57,162 INFO L203 MainTranslator]: Completed pre-run [2022-10-17 17:38:57,175 WARN L230 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_7752747b-73a4-448d-9e23-62f234213445/sv-benchmarks/c/array-examples/standard_partition_ground-1.i[860,873] [2022-10-17 17:38:57,203 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-10-17 17:38:57,220 INFO L208 MainTranslator]: Completed translation [2022-10-17 17:38:57,220 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:38:57 WrapperNode [2022-10-17 17:38:57,220 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-10-17 17:38:57,222 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-10-17 17:38:57,222 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-10-17 17:38:57,222 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-10-17 17:38:57,230 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:38:57" (1/1) ... [2022-10-17 17:38:57,247 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:38:57" (1/1) ... [2022-10-17 17:38:57,275 INFO L138 Inliner]: procedures = 16, calls = 26, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 82 [2022-10-17 17:38:57,276 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-10-17 17:38:57,277 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-10-17 17:38:57,277 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-10-17 17:38:57,277 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-10-17 17:38:57,286 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:38:57" (1/1) ... [2022-10-17 17:38:57,287 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:38:57" (1/1) ... [2022-10-17 17:38:57,292 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:38:57" (1/1) ... [2022-10-17 17:38:57,293 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:38:57" (1/1) ... [2022-10-17 17:38:57,308 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:38:57" (1/1) ... [2022-10-17 17:38:57,313 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:38:57" (1/1) ... [2022-10-17 17:38:57,325 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:38:57" (1/1) ... [2022-10-17 17:38:57,327 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:38:57" (1/1) ... [2022-10-17 17:38:57,329 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-10-17 17:38:57,332 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-10-17 17:38:57,332 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-10-17 17:38:57,333 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-10-17 17:38:57,334 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:38:57" (1/1) ... [2022-10-17 17:38:57,340 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-10-17 17:38:57,351 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7752747b-73a4-448d-9e23-62f234213445/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:38:57,368 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7752747b-73a4-448d-9e23-62f234213445/bin/utaipan-G1rejxKTta/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-10-17 17:38:57,401 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7752747b-73a4-448d-9e23-62f234213445/bin/utaipan-G1rejxKTta/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-10-17 17:38:57,419 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-10-17 17:38:57,419 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-10-17 17:38:57,420 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-10-17 17:38:57,420 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-10-17 17:38:57,420 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-10-17 17:38:57,420 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-10-17 17:38:57,420 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-10-17 17:38:57,421 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-10-17 17:38:57,421 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-10-17 17:38:57,421 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-10-17 17:38:57,498 INFO L235 CfgBuilder]: Building ICFG [2022-10-17 17:38:57,500 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-10-17 17:38:57,721 INFO L276 CfgBuilder]: Performing block encoding [2022-10-17 17:38:57,857 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-10-17 17:38:57,858 INFO L300 CfgBuilder]: Removed 4 assume(true) statements. [2022-10-17 17:38:57,875 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.10 05:38:57 BoogieIcfgContainer [2022-10-17 17:38:57,876 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-10-17 17:38:57,877 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-10-17 17:38:57,878 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-10-17 17:38:57,881 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-10-17 17:38:57,881 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 17.10 05:38:56" (1/3) ... [2022-10-17 17:38:57,882 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2a5e98a6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.10 05:38:57, skipping insertion in model container [2022-10-17 17:38:57,882 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:38:57" (2/3) ... [2022-10-17 17:38:57,883 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2a5e98a6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.10 05:38:57, skipping insertion in model container [2022-10-17 17:38:57,883 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.10 05:38:57" (3/3) ... [2022-10-17 17:38:57,884 INFO L112 eAbstractionObserver]: Analyzing ICFG standard_partition_ground-1.i [2022-10-17 17:38:57,904 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-10-17 17:38:57,904 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-10-17 17:38:57,948 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-10-17 17:38:57,956 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=LoopsAndPotentialCycles, 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;@6365d2b2, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-10-17 17:38:57,956 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-10-17 17:38:57,961 INFO L276 IsEmpty]: Start isEmpty. Operand has 16 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 12 states have internal predecessors, (17), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-10-17 17:38:57,968 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-10-17 17:38:57,968 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:38:57,969 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:38:57,969 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:38:57,974 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:38:57,974 INFO L85 PathProgramCache]: Analyzing trace with hash 2100370030, now seen corresponding path program 1 times [2022-10-17 17:38:57,984 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:38:57,985 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [792690420] [2022-10-17 17:38:57,985 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:38:57,985 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:38:58,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:38:58,205 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 17:38:58,206 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:38:58,207 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [792690420] [2022-10-17 17:38:58,208 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [792690420] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 17:38:58,208 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-17 17:38:58,208 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-10-17 17:38:58,214 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [241467995] [2022-10-17 17:38:58,215 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 17:38:58,218 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-10-17 17:38:58,218 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:38:58,260 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-10-17 17:38:58,260 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-10-17 17:38:58,262 INFO L87 Difference]: Start difference. First operand has 16 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 12 states have internal predecessors, (17), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:38:58,324 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:38:58,324 INFO L93 Difference]: Finished difference Result 32 states and 45 transitions. [2022-10-17 17:38:58,325 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-10-17 17:38:58,327 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2022-10-17 17:38:58,327 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:38:58,335 INFO L225 Difference]: With dead ends: 32 [2022-10-17 17:38:58,336 INFO L226 Difference]: Without dead ends: 17 [2022-10-17 17:38:58,339 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-10-17 17:38:58,346 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 0 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 18 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-10-17 17:38:58,347 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 22 Invalid, 18 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-10-17 17:38:58,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2022-10-17 17:38:58,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2022-10-17 17:38:58,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 13 states have (on average 1.3076923076923077) internal successors, (17), 13 states have internal predecessors, (17), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-10-17 17:38:58,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 21 transitions. [2022-10-17 17:38:58,386 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 21 transitions. Word has length 8 [2022-10-17 17:38:58,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:38:58,386 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 21 transitions. [2022-10-17 17:38:58,388 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:38:58,388 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 21 transitions. [2022-10-17 17:38:58,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-10-17 17:38:58,389 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:38:58,389 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:38:58,390 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-10-17 17:38:58,390 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:38:58,391 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:38:58,391 INFO L85 PathProgramCache]: Analyzing trace with hash -1841340969, now seen corresponding path program 1 times [2022-10-17 17:38:58,391 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:38:58,392 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [820722455] [2022-10-17 17:38:58,392 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:38:58,393 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:38:58,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:38:58,600 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-10-17 17:38:58,600 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:38:58,600 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [820722455] [2022-10-17 17:38:58,600 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [820722455] provided 0 perfect and 1 imperfect interpolant sequences [2022-10-17 17:38:58,601 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1422199008] [2022-10-17 17:38:58,601 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:38:58,601 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:38:58,601 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7752747b-73a4-448d-9e23-62f234213445/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:38:58,611 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7752747b-73a4-448d-9e23-62f234213445/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-10-17 17:38:58,615 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7752747b-73a4-448d-9e23-62f234213445/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-10-17 17:38:58,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:38:58,690 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 3 conjunts are in the unsatisfiable core [2022-10-17 17:38:58,694 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-10-17 17:38:58,739 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-10-17 17:38:58,739 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-10-17 17:38:58,767 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-10-17 17:38:58,768 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1422199008] provided 0 perfect and 2 imperfect interpolant sequences [2022-10-17 17:38:58,768 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1735947583] [2022-10-17 17:38:58,789 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-10-17 17:38:58,789 INFO L166 IcfgInterpreter]: Building call graph [2022-10-17 17:38:58,793 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-10-17 17:38:58,799 INFO L176 IcfgInterpreter]: Starting interpretation [2022-10-17 17:38:58,799 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-10-17 17:38:58,878 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:38:58,879 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:38:58,881 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:38:58,958 INFO L356 Elim1Store]: treesize reduction 83, result has 23.9 percent of original size [2022-10-17 17:38:58,959 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 23 treesize of output 42 [2022-10-17 17:38:58,993 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:38:58,997 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:38:59,000 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:38:59,095 INFO L356 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2022-10-17 17:38:59,096 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 9 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 55 treesize of output 73 [2022-10-17 17:38:59,222 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:38:59,223 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:38:59,226 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 10 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 87 treesize of output 104 [2022-10-17 17:38:59,319 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:38:59,320 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:38:59,326 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 9 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 60 treesize of output 44 [2022-10-17 17:38:59,356 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 12 [2022-10-17 17:38:59,601 INFO L356 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2022-10-17 17:38:59,602 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 78 treesize of output 76 [2022-10-17 17:38:59,718 INFO L356 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2022-10-17 17:38:59,720 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 35 treesize of output 19 [2022-10-17 17:38:59,729 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 12 [2022-10-17 17:38:59,895 INFO L356 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2022-10-17 17:38:59,896 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 78 treesize of output 76 [2022-10-17 17:38:59,953 INFO L356 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2022-10-17 17:38:59,953 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 35 treesize of output 19 [2022-10-17 17:38:59,961 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 12 [2022-10-17 17:39:00,031 INFO L356 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-10-17 17:39:00,032 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 18 [2022-10-17 17:39:00,112 INFO L356 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2022-10-17 17:39:00,112 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 27 [2022-10-17 17:39:00,194 INFO L356 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2022-10-17 17:39:00,194 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 27 [2022-10-17 17:39:00,225 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 20 for LOIs [2022-10-17 17:39:00,245 INFO L180 IcfgInterpreter]: Interpretation finished [2022-10-17 17:39:00,512 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '156#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (exists ((|v_ULTIMATE.start_main_~#bb~0#1.base_BEFORE_CALL_1| Int)) (and (= (ite (<= 0 (select (select |#memory_int| |v_ULTIMATE.start_main_~#bb~0#1.base_BEFORE_CALL_1|) 0)) 1 0) |__VERIFIER_assert_#in~cond|) (<= 0 |v_ULTIMATE.start_main_~#bb~0#1.base_BEFORE_CALL_1|))) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-10-17 17:39:00,512 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-10-17 17:39:00,512 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-10-17 17:39:00,512 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2022-10-17 17:39:00,513 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1734426796] [2022-10-17 17:39:00,513 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-10-17 17:39:00,514 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-10-17 17:39:00,514 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:39:00,515 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-10-17 17:39:00,515 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=140, Unknown=0, NotChecked=0, Total=182 [2022-10-17 17:39:00,516 INFO L87 Difference]: Start difference. First operand 17 states and 21 transitions. Second operand has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:39:00,577 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:39:00,577 INFO L93 Difference]: Finished difference Result 37 states and 50 transitions. [2022-10-17 17:39:00,578 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-10-17 17:39:00,578 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2022-10-17 17:39:00,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:39:00,579 INFO L225 Difference]: With dead ends: 37 [2022-10-17 17:39:00,579 INFO L226 Difference]: Without dead ends: 23 [2022-10-17 17:39:00,580 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=42, Invalid=140, Unknown=0, NotChecked=0, Total=182 [2022-10-17 17:39:00,581 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 0 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 40 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-10-17 17:39:00,582 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 44 Invalid, 40 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 28 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-10-17 17:39:00,582 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2022-10-17 17:39:00,586 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2022-10-17 17:39:00,586 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 19 states have (on average 1.2105263157894737) internal successors, (23), 19 states have internal predecessors, (23), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-10-17 17:39:00,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 27 transitions. [2022-10-17 17:39:00,588 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 27 transitions. Word has length 10 [2022-10-17 17:39:00,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:39:00,588 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 27 transitions. [2022-10-17 17:39:00,588 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:39:00,588 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 27 transitions. [2022-10-17 17:39:00,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-10-17 17:39:00,589 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:39:00,589 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:39:00,627 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7752747b-73a4-448d-9e23-62f234213445/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-10-17 17:39:00,803 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7752747b-73a4-448d-9e23-62f234213445/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2022-10-17 17:39:00,803 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:39:00,804 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:39:00,804 INFO L85 PathProgramCache]: Analyzing trace with hash 218719918, now seen corresponding path program 2 times [2022-10-17 17:39:00,804 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:39:00,804 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1557430231] [2022-10-17 17:39:00,804 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:39:00,805 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:39:00,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:39:01,142 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-10-17 17:39:01,143 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:39:01,143 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1557430231] [2022-10-17 17:39:01,143 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1557430231] provided 0 perfect and 1 imperfect interpolant sequences [2022-10-17 17:39:01,143 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1323288258] [2022-10-17 17:39:01,143 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-10-17 17:39:01,144 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:39:01,144 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7752747b-73a4-448d-9e23-62f234213445/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:39:01,149 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7752747b-73a4-448d-9e23-62f234213445/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-10-17 17:39:01,169 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7752747b-73a4-448d-9e23-62f234213445/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-10-17 17:39:01,275 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-10-17 17:39:01,275 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-10-17 17:39:01,277 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 6 conjunts are in the unsatisfiable core [2022-10-17 17:39:01,279 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-10-17 17:39:01,303 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-10-17 17:39:01,303 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-10-17 17:39:01,366 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-10-17 17:39:01,367 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1323288258] provided 0 perfect and 2 imperfect interpolant sequences [2022-10-17 17:39:01,367 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1621502085] [2022-10-17 17:39:01,371 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-10-17 17:39:01,372 INFO L166 IcfgInterpreter]: Building call graph [2022-10-17 17:39:01,372 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-10-17 17:39:01,372 INFO L176 IcfgInterpreter]: Starting interpretation [2022-10-17 17:39:01,372 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-10-17 17:39:01,395 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:39:01,396 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:39:01,397 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:39:01,460 INFO L356 Elim1Store]: treesize reduction 83, result has 23.9 percent of original size [2022-10-17 17:39:01,461 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 23 treesize of output 42 [2022-10-17 17:39:01,486 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:39:01,489 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:39:01,491 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:39:01,572 INFO L356 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2022-10-17 17:39:01,573 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 9 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 55 treesize of output 73 [2022-10-17 17:39:01,623 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:39:01,625 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:39:01,629 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 10 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 72 treesize of output 99 [2022-10-17 17:39:01,714 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:39:01,715 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:39:01,719 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:39:01,721 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 10 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 70 treesize of output 47 [2022-10-17 17:39:01,731 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2022-10-17 17:39:01,741 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2022-10-17 17:39:01,840 INFO L356 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2022-10-17 17:39:01,841 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 78 treesize of output 76 [2022-10-17 17:39:01,963 INFO L356 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2022-10-17 17:39:01,963 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 75 treesize of output 54 [2022-10-17 17:39:01,971 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 54 treesize of output 26 [2022-10-17 17:39:02,014 INFO L356 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2022-10-17 17:39:02,014 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 80 treesize of output 59 [2022-10-17 17:39:02,023 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 59 treesize of output 31 [2022-10-17 17:39:02,090 INFO L173 IndexEqualityManager]: detected equality via solver [2022-10-17 17:39:02,107 INFO L356 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2022-10-17 17:39:02,108 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 33 treesize of output 23 [2022-10-17 17:39:02,165 INFO L356 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2022-10-17 17:39:02,165 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 27 [2022-10-17 17:39:02,208 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 20 for LOIs [2022-10-17 17:39:02,232 INFO L180 IcfgInterpreter]: Interpretation finished [2022-10-17 17:39:02,594 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '363#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (exists ((|v_ULTIMATE.start_main_~#bb~0#1.base_BEFORE_CALL_2| Int)) (and (<= 0 |v_ULTIMATE.start_main_~#bb~0#1.base_BEFORE_CALL_2|) (= (ite (<= 0 (select (select |#memory_int| |v_ULTIMATE.start_main_~#bb~0#1.base_BEFORE_CALL_2|) 0)) 1 0) |__VERIFIER_assert_#in~cond|))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-10-17 17:39:02,594 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-10-17 17:39:02,594 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-10-17 17:39:02,594 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2022-10-17 17:39:02,594 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2097659804] [2022-10-17 17:39:02,595 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-10-17 17:39:02,595 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-10-17 17:39:02,595 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:39:02,596 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-10-17 17:39:02,596 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=281, Unknown=0, NotChecked=0, Total=380 [2022-10-17 17:39:02,596 INFO L87 Difference]: Start difference. First operand 23 states and 27 transitions. Second operand has 13 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 12 states have internal predecessors, (20), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:39:02,691 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:39:02,691 INFO L93 Difference]: Finished difference Result 52 states and 71 transitions. [2022-10-17 17:39:02,692 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-10-17 17:39:02,692 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 12 states have internal predecessors, (20), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2022-10-17 17:39:02,692 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:39:02,695 INFO L225 Difference]: With dead ends: 52 [2022-10-17 17:39:02,695 INFO L226 Difference]: Without dead ends: 35 [2022-10-17 17:39:02,696 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 129 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=99, Invalid=281, Unknown=0, NotChecked=0, Total=380 [2022-10-17 17:39:02,698 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 0 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 74 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-10-17 17:39:02,700 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 44 Invalid, 74 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-10-17 17:39:02,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2022-10-17 17:39:02,710 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2022-10-17 17:39:02,710 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 31 states have (on average 1.1290322580645162) internal successors, (35), 31 states have internal predecessors, (35), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-10-17 17:39:02,713 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2022-10-17 17:39:02,714 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 16 [2022-10-17 17:39:02,714 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:39:02,714 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2022-10-17 17:39:02,714 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 12 states have internal predecessors, (20), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:39:02,714 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2022-10-17 17:39:02,715 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-10-17 17:39:02,716 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:39:02,716 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:39:02,753 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7752747b-73a4-448d-9e23-62f234213445/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-10-17 17:39:02,931 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7752747b-73a4-448d-9e23-62f234213445/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:39:02,931 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:39:02,931 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:39:02,932 INFO L85 PathProgramCache]: Analyzing trace with hash -580895474, now seen corresponding path program 3 times [2022-10-17 17:39:02,932 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:39:02,932 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [461315602] [2022-10-17 17:39:02,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:39:02,932 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:39:02,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:39:03,357 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-10-17 17:39:03,357 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:39:03,357 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [461315602] [2022-10-17 17:39:03,357 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [461315602] provided 0 perfect and 1 imperfect interpolant sequences [2022-10-17 17:39:03,358 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1210688557] [2022-10-17 17:39:03,358 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-10-17 17:39:03,358 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:39:03,358 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7752747b-73a4-448d-9e23-62f234213445/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:39:03,363 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7752747b-73a4-448d-9e23-62f234213445/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-10-17 17:39:03,379 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7752747b-73a4-448d-9e23-62f234213445/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-10-17 17:39:03,496 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-10-17 17:39:03,496 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-10-17 17:39:03,499 INFO L263 TraceCheckSpWp]: Trace formula consists of 333 conjuncts, 12 conjunts are in the unsatisfiable core [2022-10-17 17:39:03,504 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-10-17 17:39:03,538 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-10-17 17:39:03,538 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-10-17 17:39:03,735 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-10-17 17:39:03,736 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1210688557] provided 0 perfect and 2 imperfect interpolant sequences [2022-10-17 17:39:03,736 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1784599649] [2022-10-17 17:39:03,741 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-10-17 17:39:03,741 INFO L166 IcfgInterpreter]: Building call graph [2022-10-17 17:39:03,742 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-10-17 17:39:03,742 INFO L176 IcfgInterpreter]: Starting interpretation [2022-10-17 17:39:03,742 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-10-17 17:39:03,763 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:39:03,764 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:39:03,765 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:39:03,816 INFO L356 Elim1Store]: treesize reduction 83, result has 23.9 percent of original size [2022-10-17 17:39:03,816 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 23 treesize of output 42 [2022-10-17 17:39:03,835 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:39:03,839 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:39:03,842 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:39:03,904 INFO L356 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2022-10-17 17:39:03,909 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 9 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 55 treesize of output 73 [2022-10-17 17:39:03,973 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:39:03,974 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:39:03,977 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 10 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 87 treesize of output 104 [2022-10-17 17:39:04,009 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:39:04,015 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:39:04,020 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 9 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 66 treesize of output 48 [2022-10-17 17:39:04,030 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 7 [2022-10-17 17:39:04,115 INFO L356 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2022-10-17 17:39:04,116 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 78 treesize of output 76 [2022-10-17 17:39:04,223 INFO L356 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2022-10-17 17:39:04,224 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 80 treesize of output 59 [2022-10-17 17:39:04,230 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 59 treesize of output 31 [2022-10-17 17:39:04,261 INFO L356 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2022-10-17 17:39:04,262 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 75 treesize of output 54 [2022-10-17 17:39:04,268 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 54 treesize of output 26 [2022-10-17 17:39:04,339 INFO L356 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-10-17 17:39:04,340 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 18 [2022-10-17 17:39:04,401 INFO L356 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2022-10-17 17:39:04,402 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 27 [2022-10-17 17:39:04,468 INFO L356 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2022-10-17 17:39:04,469 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 27 [2022-10-17 17:39:04,496 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 20 for LOIs [2022-10-17 17:39:04,509 INFO L180 IcfgInterpreter]: Interpretation finished [2022-10-17 17:39:04,828 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '708#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (exists ((|v_ULTIMATE.start_main_~#bb~0#1.base_BEFORE_CALL_3| Int)) (and (<= 0 |v_ULTIMATE.start_main_~#bb~0#1.base_BEFORE_CALL_3|) (= |__VERIFIER_assert_#in~cond| (ite (<= 0 (select (select |#memory_int| |v_ULTIMATE.start_main_~#bb~0#1.base_BEFORE_CALL_3|) 0)) 1 0)))) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-10-17 17:39:04,828 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-10-17 17:39:04,828 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-10-17 17:39:04,828 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 24 [2022-10-17 17:39:04,829 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [323919865] [2022-10-17 17:39:04,829 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-10-17 17:39:04,829 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-10-17 17:39:04,829 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:39:04,830 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-10-17 17:39:04,831 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=321, Invalid=671, Unknown=0, NotChecked=0, Total=992 [2022-10-17 17:39:04,831 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand has 25 states, 25 states have (on average 1.28) internal successors, (32), 24 states have internal predecessors, (32), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:39:05,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:39:05,013 INFO L93 Difference]: Finished difference Result 82 states and 113 transitions. [2022-10-17 17:39:05,013 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-10-17 17:39:05,013 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.28) internal successors, (32), 24 states have internal predecessors, (32), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2022-10-17 17:39:05,014 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:39:05,017 INFO L225 Difference]: With dead ends: 82 [2022-10-17 17:39:05,021 INFO L226 Difference]: Without dead ends: 59 [2022-10-17 17:39:05,023 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 279 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=321, Invalid=671, Unknown=0, NotChecked=0, Total=992 [2022-10-17 17:39:05,028 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 0 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 78 mSolverCounterSat, 81 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 77 SdHoareTripleChecker+Invalid, 159 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 81 IncrementalHoareTripleChecker+Valid, 78 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-10-17 17:39:05,029 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 77 Invalid, 159 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [81 Valid, 78 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-10-17 17:39:05,029 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2022-10-17 17:39:05,036 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2022-10-17 17:39:05,036 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 55 states have (on average 1.0727272727272728) internal successors, (59), 55 states have internal predecessors, (59), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-10-17 17:39:05,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 63 transitions. [2022-10-17 17:39:05,038 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 63 transitions. Word has length 28 [2022-10-17 17:39:05,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:39:05,038 INFO L495 AbstractCegarLoop]: Abstraction has 59 states and 63 transitions. [2022-10-17 17:39:05,038 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.28) internal successors, (32), 24 states have internal predecessors, (32), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:39:05,040 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 63 transitions. [2022-10-17 17:39:05,043 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-10-17 17:39:05,043 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:39:05,043 INFO L195 NwaCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:39:05,080 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7752747b-73a4-448d-9e23-62f234213445/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-10-17 17:39:05,267 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7752747b-73a4-448d-9e23-62f234213445/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:39:05,267 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:39:05,267 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:39:05,267 INFO L85 PathProgramCache]: Analyzing trace with hash -1019653682, now seen corresponding path program 4 times [2022-10-17 17:39:05,268 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:39:05,268 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1576384814] [2022-10-17 17:39:05,268 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:39:05,268 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:39:05,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:39:06,568 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-10-17 17:39:06,568 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:39:06,569 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1576384814] [2022-10-17 17:39:06,569 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1576384814] provided 0 perfect and 1 imperfect interpolant sequences [2022-10-17 17:39:06,569 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1384050642] [2022-10-17 17:39:06,569 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-10-17 17:39:06,569 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:39:06,570 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7752747b-73a4-448d-9e23-62f234213445/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:39:06,571 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7752747b-73a4-448d-9e23-62f234213445/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-10-17 17:39:06,591 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7752747b-73a4-448d-9e23-62f234213445/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-10-17 17:39:06,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:39:06,828 INFO L263 TraceCheckSpWp]: Trace formula consists of 633 conjuncts, 24 conjunts are in the unsatisfiable core [2022-10-17 17:39:06,832 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-10-17 17:39:06,900 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-10-17 17:39:06,900 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-10-17 17:39:07,637 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-10-17 17:39:07,637 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1384050642] provided 0 perfect and 2 imperfect interpolant sequences [2022-10-17 17:39:07,638 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1856732180] [2022-10-17 17:39:07,640 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-10-17 17:39:07,640 INFO L166 IcfgInterpreter]: Building call graph [2022-10-17 17:39:07,641 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-10-17 17:39:07,641 INFO L176 IcfgInterpreter]: Starting interpretation [2022-10-17 17:39:07,641 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-10-17 17:39:07,661 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:39:07,665 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:39:07,667 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:39:07,726 INFO L356 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2022-10-17 17:39:07,727 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 9 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 55 treesize of output 73 [2022-10-17 17:39:07,741 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:39:07,743 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:39:07,744 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:39:07,746 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 13 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 32 [2022-10-17 17:39:07,792 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:39:07,794 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:39:07,796 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 10 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 87 treesize of output 104 [2022-10-17 17:39:07,833 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:39:07,835 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:39:07,838 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 9 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 60 treesize of output 44 [2022-10-17 17:39:07,848 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 12 [2022-10-17 17:39:07,945 INFO L356 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2022-10-17 17:39:07,945 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 78 treesize of output 81 [2022-10-17 17:39:08,012 INFO L356 Elim1Store]: treesize reduction 13, result has 38.1 percent of original size [2022-10-17 17:39:08,012 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 60 treesize of output 46 [2022-10-17 17:39:08,023 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 12 [2022-10-17 17:39:08,039 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-10-17 17:39:08,040 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 43 treesize of output 47 [2022-10-17 17:39:08,148 INFO L356 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2022-10-17 17:39:08,149 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 78 treesize of output 81 [2022-10-17 17:39:08,191 INFO L356 Elim1Store]: treesize reduction 13, result has 38.1 percent of original size [2022-10-17 17:39:08,191 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 83 treesize of output 63 [2022-10-17 17:39:08,201 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 9 [2022-10-17 17:39:08,218 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-10-17 17:39:08,219 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 60 treesize of output 46 [2022-10-17 17:39:08,260 INFO L173 IndexEqualityManager]: detected equality via solver [2022-10-17 17:39:08,268 INFO L356 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2022-10-17 17:39:08,269 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 33 treesize of output 23 [2022-10-17 17:39:08,317 INFO L356 Elim1Store]: treesize reduction 48, result has 20.0 percent of original size [2022-10-17 17:39:08,317 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 27 [2022-10-17 17:39:08,367 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 20 for LOIs [2022-10-17 17:39:08,382 INFO L180 IcfgInterpreter]: Interpretation finished [2022-10-17 17:39:08,723 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1329#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (exists ((|v_ULTIMATE.start_main_~#bb~0#1.base_BEFORE_CALL_4| Int)) (and (= |__VERIFIER_assert_#in~cond| (ite (<= 0 (select (select |#memory_int| |v_ULTIMATE.start_main_~#bb~0#1.base_BEFORE_CALL_4|) 0)) 1 0)) (<= 0 |v_ULTIMATE.start_main_~#bb~0#1.base_BEFORE_CALL_4|))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-10-17 17:39:08,723 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-10-17 17:39:08,723 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-10-17 17:39:08,723 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 48 [2022-10-17 17:39:08,724 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [84485648] [2022-10-17 17:39:08,724 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-10-17 17:39:08,725 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2022-10-17 17:39:08,725 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:39:08,726 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2022-10-17 17:39:08,728 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1197, Invalid=1883, Unknown=0, NotChecked=0, Total=3080 [2022-10-17 17:39:08,729 INFO L87 Difference]: Start difference. First operand 59 states and 63 transitions. Second operand has 49 states, 49 states have (on average 1.1428571428571428) internal successors, (56), 48 states have internal predecessors, (56), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:39:09,054 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:39:09,054 INFO L93 Difference]: Finished difference Result 142 states and 197 transitions. [2022-10-17 17:39:09,054 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2022-10-17 17:39:09,055 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 1.1428571428571428) internal successors, (56), 48 states have internal predecessors, (56), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 52 [2022-10-17 17:39:09,055 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:39:09,056 INFO L225 Difference]: With dead ends: 142 [2022-10-17 17:39:09,056 INFO L226 Difference]: Without dead ends: 107 [2022-10-17 17:39:09,058 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 124 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 579 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1197, Invalid=1883, Unknown=0, NotChecked=0, Total=3080 [2022-10-17 17:39:09,059 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 0 mSDsluCounter, 70 mSDsCounter, 0 mSdLazyCounter, 122 mSolverCounterSat, 193 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 66 SdHoareTripleChecker+Invalid, 315 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 193 IncrementalHoareTripleChecker+Valid, 122 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-10-17 17:39:09,060 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 66 Invalid, 315 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [193 Valid, 122 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-10-17 17:39:09,061 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2022-10-17 17:39:09,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 107. [2022-10-17 17:39:09,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 103 states have (on average 1.0388349514563107) internal successors, (107), 103 states have internal predecessors, (107), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-10-17 17:39:09,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 111 transitions. [2022-10-17 17:39:09,074 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 111 transitions. Word has length 52 [2022-10-17 17:39:09,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:39:09,075 INFO L495 AbstractCegarLoop]: Abstraction has 107 states and 111 transitions. [2022-10-17 17:39:09,075 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 1.1428571428571428) internal successors, (56), 48 states have internal predecessors, (56), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:39:09,076 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 111 transitions. [2022-10-17 17:39:09,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2022-10-17 17:39:09,079 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:39:09,080 INFO L195 NwaCegarLoop]: trace histogram [46, 46, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:39:09,107 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7752747b-73a4-448d-9e23-62f234213445/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-10-17 17:39:09,283 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7752747b-73a4-448d-9e23-62f234213445/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:39:09,283 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:39:09,283 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:39:09,283 INFO L85 PathProgramCache]: Analyzing trace with hash 809573198, now seen corresponding path program 5 times [2022-10-17 17:39:09,283 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:39:09,284 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1609683308] [2022-10-17 17:39:09,284 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:39:09,284 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:39:09,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:39:13,038 INFO L134 CoverageAnalysis]: Checked inductivity of 2162 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 1081 trivial. 0 not checked. [2022-10-17 17:39:13,038 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:39:13,038 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1609683308] [2022-10-17 17:39:13,039 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1609683308] provided 0 perfect and 1 imperfect interpolant sequences [2022-10-17 17:39:13,039 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1867872731] [2022-10-17 17:39:13,039 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-10-17 17:39:13,039 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:39:13,040 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7752747b-73a4-448d-9e23-62f234213445/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:39:13,052 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7752747b-73a4-448d-9e23-62f234213445/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-10-17 17:39:13,073 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7752747b-73a4-448d-9e23-62f234213445/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process