./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-crafted/simple_array_index_value_1-1.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 6b4ec56b Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f90cf9c-d3c1-4f19-8ec3-11b009af6b06/bin/utaipan-6cKwYrpEi9/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f90cf9c-d3c1-4f19-8ec3-11b009af6b06/bin/utaipan-6cKwYrpEi9/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f90cf9c-d3c1-4f19-8ec3-11b009af6b06/bin/utaipan-6cKwYrpEi9/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f90cf9c-d3c1-4f19-8ec3-11b009af6b06/bin/utaipan-6cKwYrpEi9/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-crafted/simple_array_index_value_1-1.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f90cf9c-d3c1-4f19-8ec3-11b009af6b06/bin/utaipan-6cKwYrpEi9/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f90cf9c-d3c1-4f19-8ec3-11b009af6b06/bin/utaipan-6cKwYrpEi9 --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 455c8355a70d1790a36f88862e376be10c9f4a7e771f908daaa372028f23f8c4 --- 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-6b4ec56 [2022-11-20 21:09:42,420 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-20 21:09:42,422 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-20 21:09:42,464 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-20 21:09:42,465 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-20 21:09:42,468 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-20 21:09:42,471 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-20 21:09:42,474 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-20 21:09:42,476 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-20 21:09:42,481 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-20 21:09:42,482 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-20 21:09:42,483 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-20 21:09:42,484 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-20 21:09:42,485 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-20 21:09:42,486 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-20 21:09:42,487 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-20 21:09:42,488 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-20 21:09:42,488 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-20 21:09:42,490 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-20 21:09:42,496 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-20 21:09:42,499 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-20 21:09:42,501 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-20 21:09:42,503 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-20 21:09:42,504 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-20 21:09:42,517 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-20 21:09:42,518 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-20 21:09:42,518 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-20 21:09:42,520 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-20 21:09:42,521 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-20 21:09:42,522 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-20 21:09:42,522 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-20 21:09:42,523 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-20 21:09:42,525 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-20 21:09:42,526 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-20 21:09:42,528 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-20 21:09:42,528 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-20 21:09:42,529 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-20 21:09:42,529 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-20 21:09:42,531 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-20 21:09:42,532 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-20 21:09:42,533 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-20 21:09:42,534 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f90cf9c-d3c1-4f19-8ec3-11b009af6b06/bin/utaipan-6cKwYrpEi9/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-20 21:09:42,576 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-20 21:09:42,576 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-20 21:09:42,577 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-20 21:09:42,577 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-20 21:09:42,578 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-20 21:09:42,578 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-20 21:09:42,578 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-20 21:09:42,578 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-20 21:09:42,579 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-20 21:09:42,579 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-20 21:09:42,580 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-20 21:09:42,580 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-20 21:09:42,580 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-20 21:09:42,580 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-20 21:09:42,581 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-20 21:09:42,581 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-20 21:09:42,581 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-20 21:09:42,581 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-20 21:09:42,582 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-20 21:09:42,582 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-20 21:09:42,582 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-20 21:09:42,583 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-20 21:09:42,583 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-20 21:09:42,583 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-20 21:09:42,583 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-20 21:09:42,583 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-20 21:09:42,584 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-20 21:09:42,584 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-20 21:09:42,584 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-20 21:09:42,584 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-20 21:09:42,585 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-20 21:09:42,585 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-20 21:09:42,585 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-20 21:09:42,585 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-20 21:09:42,586 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-20 21:09:42,586 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-20 21:09:42,586 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-20 21:09:42,586 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-20 21:09:42,586 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-20 21:09:42,587 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-20 21:09:42,587 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-20 21:09:42,587 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_7f90cf9c-d3c1-4f19-8ec3-11b009af6b06/bin/utaipan-6cKwYrpEi9/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f90cf9c-d3c1-4f19-8ec3-11b009af6b06/bin/utaipan-6cKwYrpEi9 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 455c8355a70d1790a36f88862e376be10c9f4a7e771f908daaa372028f23f8c4 [2022-11-20 21:09:42,893 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-20 21:09:42,920 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-20 21:09:42,922 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-20 21:09:42,923 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-20 21:09:42,924 INFO L275 PluginConnector]: CDTParser initialized [2022-11-20 21:09:42,925 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f90cf9c-d3c1-4f19-8ec3-11b009af6b06/bin/utaipan-6cKwYrpEi9/../../sv-benchmarks/c/loop-crafted/simple_array_index_value_1-1.i [2022-11-20 21:09:45,972 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-20 21:09:46,184 INFO L351 CDTParser]: Found 1 translation units. [2022-11-20 21:09:46,184 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f90cf9c-d3c1-4f19-8ec3-11b009af6b06/sv-benchmarks/c/loop-crafted/simple_array_index_value_1-1.i [2022-11-20 21:09:46,191 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f90cf9c-d3c1-4f19-8ec3-11b009af6b06/bin/utaipan-6cKwYrpEi9/data/5013b1131/fccffdd9a8d041499c04886c14498742/FLAGdd686498b [2022-11-20 21:09:46,210 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f90cf9c-d3c1-4f19-8ec3-11b009af6b06/bin/utaipan-6cKwYrpEi9/data/5013b1131/fccffdd9a8d041499c04886c14498742 [2022-11-20 21:09:46,212 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-20 21:09:46,214 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-20 21:09:46,218 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-20 21:09:46,218 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-20 21:09:46,222 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-20 21:09:46,223 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 09:09:46" (1/1) ... [2022-11-20 21:09:46,224 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1f1e01e7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 09:09:46, skipping insertion in model container [2022-11-20 21:09:46,224 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 09:09:46" (1/1) ... [2022-11-20 21:09:46,232 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-20 21:09:46,253 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-20 21:09:46,454 WARN L237 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_7f90cf9c-d3c1-4f19-8ec3-11b009af6b06/sv-benchmarks/c/loop-crafted/simple_array_index_value_1-1.i[834,847] [2022-11-20 21:09:46,468 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-20 21:09:46,477 INFO L203 MainTranslator]: Completed pre-run [2022-11-20 21:09:46,488 WARN L237 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_7f90cf9c-d3c1-4f19-8ec3-11b009af6b06/sv-benchmarks/c/loop-crafted/simple_array_index_value_1-1.i[834,847] [2022-11-20 21:09:46,494 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-20 21:09:46,508 INFO L208 MainTranslator]: Completed translation [2022-11-20 21:09:46,508 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 09:09:46 WrapperNode [2022-11-20 21:09:46,508 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-20 21:09:46,509 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-20 21:09:46,509 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-20 21:09:46,509 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-20 21:09:46,517 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 09:09:46" (1/1) ... [2022-11-20 21:09:46,524 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 09:09:46" (1/1) ... [2022-11-20 21:09:46,550 INFO L138 Inliner]: procedures = 15, calls = 13, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 37 [2022-11-20 21:09:46,551 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-20 21:09:46,552 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-20 21:09:46,552 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-20 21:09:46,552 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-20 21:09:46,562 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 09:09:46" (1/1) ... [2022-11-20 21:09:46,563 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 09:09:46" (1/1) ... [2022-11-20 21:09:46,578 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 09:09:46" (1/1) ... [2022-11-20 21:09:46,578 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 09:09:46" (1/1) ... [2022-11-20 21:09:46,582 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 09:09:46" (1/1) ... [2022-11-20 21:09:46,586 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 09:09:46" (1/1) ... [2022-11-20 21:09:46,587 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 09:09:46" (1/1) ... [2022-11-20 21:09:46,588 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 09:09:46" (1/1) ... [2022-11-20 21:09:46,589 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-20 21:09:46,590 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-20 21:09:46,591 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-20 21:09:46,591 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-20 21:09:46,599 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 09:09:46" (1/1) ... [2022-11-20 21:09:46,605 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-20 21:09:46,617 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f90cf9c-d3c1-4f19-8ec3-11b009af6b06/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:09:46,637 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f90cf9c-d3c1-4f19-8ec3-11b009af6b06/bin/utaipan-6cKwYrpEi9/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-20 21:09:46,665 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f90cf9c-d3c1-4f19-8ec3-11b009af6b06/bin/utaipan-6cKwYrpEi9/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-20 21:09:46,686 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-20 21:09:46,686 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-20 21:09:46,687 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-11-20 21:09:46,687 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-11-20 21:09:46,687 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-20 21:09:46,687 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-20 21:09:46,687 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-11-20 21:09:46,688 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-11-20 21:09:46,688 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-11-20 21:09:46,688 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-11-20 21:09:46,771 INFO L235 CfgBuilder]: Building ICFG [2022-11-20 21:09:46,773 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-20 21:09:46,982 INFO L276 CfgBuilder]: Performing block encoding [2022-11-20 21:09:47,023 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-20 21:09:47,023 INFO L300 CfgBuilder]: Removed 2 assume(true) statements. [2022-11-20 21:09:47,026 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 09:09:47 BoogieIcfgContainer [2022-11-20 21:09:47,026 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-20 21:09:47,041 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-20 21:09:47,055 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-20 21:09:47,059 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-20 21:09:47,059 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.11 09:09:46" (1/3) ... [2022-11-20 21:09:47,060 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@63b993ef and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 09:09:47, skipping insertion in model container [2022-11-20 21:09:47,060 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 09:09:46" (2/3) ... [2022-11-20 21:09:47,060 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@63b993ef and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 09:09:47, skipping insertion in model container [2022-11-20 21:09:47,061 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 09:09:47" (3/3) ... [2022-11-20 21:09:47,062 INFO L112 eAbstractionObserver]: Analyzing ICFG simple_array_index_value_1-1.i [2022-11-20 21:09:47,086 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-20 21:09:47,086 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-20 21:09:47,160 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-20 21:09:47,168 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;@636cb585, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-20 21:09:47,168 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-20 21:09:47,172 INFO L276 IsEmpty]: Start isEmpty. Operand has 16 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 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) [2022-11-20 21:09:47,178 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-11-20 21:09:47,178 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:09:47,179 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:09:47,180 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:09:47,185 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:09:47,185 INFO L85 PathProgramCache]: Analyzing trace with hash 473793790, now seen corresponding path program 1 times [2022-11-20 21:09:47,197 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:09:47,198 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1708342492] [2022-11-20 21:09:47,198 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:09:47,199 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:09:47,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:09:47,550 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:09:47,550 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:09:47,551 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1708342492] [2022-11-20 21:09:47,552 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1708342492] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 21:09:47,552 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 21:09:47,552 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-20 21:09:47,554 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1138609657] [2022-11-20 21:09:47,555 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 21:09:47,559 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 21:09:47,559 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:09:47,591 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 21:09:47,592 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 21:09:47,594 INFO L87 Difference]: Start difference. First operand has 16 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 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) [2022-11-20 21:09:47,663 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:09:47,663 INFO L93 Difference]: Finished difference Result 36 states and 50 transitions. [2022-11-20 21:09:47,665 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 21:09:47,666 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 [2022-11-20 21:09:47,667 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:09:47,673 INFO L225 Difference]: With dead ends: 36 [2022-11-20 21:09:47,674 INFO L226 Difference]: Without dead ends: 21 [2022-11-20 21:09:47,677 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 [2022-11-20 21:09:47,680 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 3 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 16 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-20 21:09:47,681 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 24 Invalid, 16 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-20 21:09:47,703 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2022-11-20 21:09:47,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 18. [2022-11-20 21:09:47,725 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 14 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) [2022-11-20 21:09:47,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 21 transitions. [2022-11-20 21:09:47,729 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 21 transitions. Word has length 8 [2022-11-20 21:09:47,730 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:09:47,731 INFO L495 AbstractCegarLoop]: Abstraction has 18 states and 21 transitions. [2022-11-20 21:09:47,731 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) [2022-11-20 21:09:47,732 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 21 transitions. [2022-11-20 21:09:47,735 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-20 21:09:47,735 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:09:47,735 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:09:47,736 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-20 21:09:47,736 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:09:47,737 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:09:47,737 INFO L85 PathProgramCache]: Analyzing trace with hash 1820995994, now seen corresponding path program 1 times [2022-11-20 21:09:47,737 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:09:47,738 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1787258897] [2022-11-20 21:09:47,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:09:47,739 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:09:47,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:09:48,006 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:09:48,006 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:09:48,007 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1787258897] [2022-11-20 21:09:48,007 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1787258897] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:09:48,007 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1531090500] [2022-11-20 21:09:48,007 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:09:48,008 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:09:48,008 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f90cf9c-d3c1-4f19-8ec3-11b009af6b06/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:09:48,015 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f90cf9c-d3c1-4f19-8ec3-11b009af6b06/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:09:48,037 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f90cf9c-d3c1-4f19-8ec3-11b009af6b06/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-20 21:09:48,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:09:48,103 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-20 21:09:48,112 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:09:48,182 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-20 21:09:48,283 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 15 treesize of output 7 [2022-11-20 21:09:48,347 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:09:48,348 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:09:48,833 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 39 treesize of output 35 [2022-11-20 21:09:48,841 INFO L350 Elim1Store]: Elim1 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 44 treesize of output 40 [2022-11-20 21:09:48,922 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:09:48,922 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1531090500] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:09:48,922 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1573274952] [2022-11-20 21:09:48,957 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-20 21:09:48,957 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:09:48,963 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:09:48,972 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:09:48,973 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:09:49,031 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:09:49,053 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-20 21:09:49,053 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-20 21:09:49,083 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:09:49,086 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-11-20 21:09:49,136 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:09:49,138 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 53 treesize of output 55 [2022-11-20 21:09:49,258 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:09:49,264 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:09:49,271 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:09:49,299 INFO L321 Elim1Store]: treesize reduction 110, result has 6.0 percent of original size [2022-11-20 21:09:49,300 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 231 treesize of output 228 [2022-11-20 21:09:49,376 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 34 [2022-11-20 21:09:49,400 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 22 for LOIs [2022-11-20 21:09:49,420 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:09:49,706 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '159#(and (exists ((|v_ULTIMATE.start_main_~#array~0#1.base_BEFORE_CALL_1| Int)) (and (<= 0 |v_ULTIMATE.start_main_~#array~0#1.base_BEFORE_CALL_1|) (= |__VERIFIER_assert_#in~cond| (ite (= (mod (select (select |#memory_int| |v_ULTIMATE.start_main_~#array~0#1.base_BEFORE_CALL_1|) 0) 4294967296) 0) 1 0)))) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-20 21:09:49,706 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 21:09:49,706 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:09:49,706 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 7, 8] total 15 [2022-11-20 21:09:49,707 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1411793034] [2022-11-20 21:09:49,707 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 21:09:49,708 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-11-20 21:09:49,708 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:09:49,709 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-11-20 21:09:49,709 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=395, Unknown=0, NotChecked=0, Total=462 [2022-11-20 21:09:49,710 INFO L87 Difference]: Start difference. First operand 18 states and 21 transitions. Second operand has 16 states, 14 states have (on average 1.5) internal successors, (21), 13 states have internal predecessors, (21), 3 states have call successors, (3), 3 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 21:09:50,070 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:09:50,071 INFO L93 Difference]: Finished difference Result 47 states and 56 transitions. [2022-11-20 21:09:50,071 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-20 21:09:50,072 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 14 states have (on average 1.5) internal successors, (21), 13 states have internal predecessors, (21), 3 states have call successors, (3), 3 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2022-11-20 21:09:50,072 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:09:50,073 INFO L225 Difference]: With dead ends: 47 [2022-11-20 21:09:50,073 INFO L226 Difference]: Without dead ends: 32 [2022-11-20 21:09:50,073 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 7 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 136 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=103, Invalid=547, Unknown=0, NotChecked=0, Total=650 [2022-11-20 21:09:50,074 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 51 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 127 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 82 SdHoareTripleChecker+Invalid, 157 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 127 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-20 21:09:50,075 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [52 Valid, 82 Invalid, 157 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 127 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-20 21:09:50,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2022-11-20 21:09:50,082 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 28. [2022-11-20 21:09:50,082 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 22 states have (on average 1.1818181818181819) internal successors, (26), 22 states have internal predecessors, (26), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-20 21:09:50,083 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2022-11-20 21:09:50,083 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 9 [2022-11-20 21:09:50,083 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:09:50,083 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2022-11-20 21:09:50,084 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 14 states have (on average 1.5) internal successors, (21), 13 states have internal predecessors, (21), 3 states have call successors, (3), 3 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 21:09:50,084 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2022-11-20 21:09:50,084 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-11-20 21:09:50,084 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:09:50,085 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:09:50,093 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f90cf9c-d3c1-4f19-8ec3-11b009af6b06/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-20 21:09:50,289 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f90cf9c-d3c1-4f19-8ec3-11b009af6b06/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:09:50,290 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:09:50,290 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:09:50,290 INFO L85 PathProgramCache]: Analyzing trace with hash -1985506181, now seen corresponding path program 1 times [2022-11-20 21:09:50,291 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:09:50,291 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1819663603] [2022-11-20 21:09:50,291 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:09:50,291 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:09:50,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:09:50,541 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-20 21:09:50,542 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:09:50,544 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1819663603] [2022-11-20 21:09:50,545 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1819663603] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:09:50,545 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [976189699] [2022-11-20 21:09:50,545 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:09:50,546 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:09:50,546 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f90cf9c-d3c1-4f19-8ec3-11b009af6b06/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:09:50,547 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f90cf9c-d3c1-4f19-8ec3-11b009af6b06/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:09:50,570 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f90cf9c-d3c1-4f19-8ec3-11b009af6b06/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-20 21:09:50,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:09:50,610 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 23 conjunts are in the unsatisfiable core [2022-11-20 21:09:50,613 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:09:50,713 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2022-11-20 21:09:51,466 INFO L321 Elim1Store]: treesize reduction 13, result has 18.8 percent of original size [2022-11-20 21:09:51,466 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 27 treesize of output 10 [2022-11-20 21:09:51,587 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:09:51,587 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:09:52,021 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 25 treesize of output 23 [2022-11-20 21:09:52,028 INFO L350 Elim1Store]: Elim1 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 40 treesize of output 36 [2022-11-20 21:09:52,112 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:09:52,112 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [976189699] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:09:52,112 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [976465188] [2022-11-20 21:09:52,115 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-20 21:09:52,115 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:09:52,115 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:09:52,115 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:09:52,115 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:09:52,137 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:09:52,151 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-20 21:09:52,152 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2022-11-20 21:09:52,162 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:09:52,182 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-20 21:09:52,183 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-20 21:09:52,205 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:09:52,208 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-20 21:09:52,259 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:09:52,260 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-20 21:09:52,303 INFO L321 Elim1Store]: treesize reduction 119, result has 25.2 percent of original size [2022-11-20 21:09:52,304 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 199 treesize of output 221 [2022-11-20 21:09:52,368 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 34 [2022-11-20 21:09:52,720 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 43 for LOIs [2022-11-20 21:09:52,779 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:09:53,974 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '405#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-20 21:09:53,974 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 21:09:53,974 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:09:53,974 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 10, 11] total 21 [2022-11-20 21:09:53,974 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1447167150] [2022-11-20 21:09:53,975 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 21:09:53,975 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-11-20 21:09:53,975 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:09:53,976 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-11-20 21:09:53,976 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=802, Unknown=0, NotChecked=0, Total=930 [2022-11-20 21:09:53,976 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand has 21 states, 19 states have (on average 2.1052631578947367) internal successors, (40), 19 states have internal predecessors, (40), 5 states have call successors, (6), 5 states have call predecessors, (6), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-20 21:09:54,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:09:54,459 INFO L93 Difference]: Finished difference Result 82 states and 99 transitions. [2022-11-20 21:09:54,460 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-20 21:09:54,460 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 19 states have (on average 2.1052631578947367) internal successors, (40), 19 states have internal predecessors, (40), 5 states have call successors, (6), 5 states have call predecessors, (6), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 19 [2022-11-20 21:09:54,460 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:09:54,461 INFO L225 Difference]: With dead ends: 82 [2022-11-20 21:09:54,461 INFO L226 Difference]: Without dead ends: 58 [2022-11-20 21:09:54,462 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 27 SyntacticMatches, 4 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 369 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=157, Invalid=1033, Unknown=0, NotChecked=0, Total=1190 [2022-11-20 21:09:54,463 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 27 mSDsluCounter, 151 mSDsCounter, 0 mSdLazyCounter, 156 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 171 SdHoareTripleChecker+Invalid, 204 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 156 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 27 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-20 21:09:54,464 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [30 Valid, 171 Invalid, 204 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 156 Invalid, 0 Unknown, 27 Unchecked, 0.2s Time] [2022-11-20 21:09:54,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2022-11-20 21:09:54,477 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 47. [2022-11-20 21:09:54,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 37 states have (on average 1.1891891891891893) internal successors, (44), 38 states have internal predecessors, (44), 6 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (6), 5 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-20 21:09:54,479 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 56 transitions. [2022-11-20 21:09:54,479 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 56 transitions. Word has length 19 [2022-11-20 21:09:54,479 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:09:54,479 INFO L495 AbstractCegarLoop]: Abstraction has 47 states and 56 transitions. [2022-11-20 21:09:54,480 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 19 states have (on average 2.1052631578947367) internal successors, (40), 19 states have internal predecessors, (40), 5 states have call successors, (6), 5 states have call predecessors, (6), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-20 21:09:54,480 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 56 transitions. [2022-11-20 21:09:54,480 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-11-20 21:09:54,481 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:09:54,481 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:09:54,492 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f90cf9c-d3c1-4f19-8ec3-11b009af6b06/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-11-20 21:09:54,687 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f90cf9c-d3c1-4f19-8ec3-11b009af6b06/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:09:54,687 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:09:54,688 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:09:54,688 INFO L85 PathProgramCache]: Analyzing trace with hash 1563962975, now seen corresponding path program 2 times [2022-11-20 21:09:54,689 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:09:54,689 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1343876961] [2022-11-20 21:09:54,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:09:54,689 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:09:54,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:09:54,822 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-20 21:09:54,822 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:09:54,823 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1343876961] [2022-11-20 21:09:54,823 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1343876961] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:09:54,823 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [734550970] [2022-11-20 21:09:54,823 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 21:09:54,823 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:09:54,824 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f90cf9c-d3c1-4f19-8ec3-11b009af6b06/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:09:54,825 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f90cf9c-d3c1-4f19-8ec3-11b009af6b06/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:09:54,843 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f90cf9c-d3c1-4f19-8ec3-11b009af6b06/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-20 21:09:54,901 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-20 21:09:54,901 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 21:09:54,924 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 30 conjunts are in the unsatisfiable core [2022-11-20 21:09:54,926 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:09:54,950 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2022-11-20 21:09:55,047 INFO L321 Elim1Store]: treesize reduction 37, result has 48.6 percent of original size [2022-11-20 21:09:55,048 INFO L350 Elim1Store]: Elim1 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 54 [2022-11-20 21:09:55,847 INFO L321 Elim1Store]: treesize reduction 13, result has 18.8 percent of original size [2022-11-20 21:09:55,848 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 27 treesize of output 10 [2022-11-20 21:09:55,959 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:09:55,960 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:09:56,747 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 36 treesize of output 34 [2022-11-20 21:09:56,756 INFO L350 Elim1Store]: Elim1 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 214 treesize of output 206 [2022-11-20 21:09:56,866 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:09:56,866 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [734550970] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:09:56,866 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [207751740] [2022-11-20 21:09:56,869 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-20 21:09:56,869 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:09:56,869 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:09:56,869 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:09:56,869 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:09:56,895 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:09:56,909 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-20 21:09:56,910 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2022-11-20 21:09:56,920 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:09:56,937 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-20 21:09:56,938 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-20 21:09:56,954 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:09:56,955 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-20 21:09:57,002 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:09:57,004 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-20 21:09:57,044 INFO L321 Elim1Store]: treesize reduction 119, result has 25.2 percent of original size [2022-11-20 21:09:57,044 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 199 treesize of output 221 [2022-11-20 21:09:57,115 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 34 [2022-11-20 21:09:57,399 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 43 for LOIs [2022-11-20 21:09:57,444 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:09:58,650 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '740#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-20 21:09:58,650 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 21:09:58,651 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:09:58,651 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 11, 12] total 24 [2022-11-20 21:09:58,651 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [153930611] [2022-11-20 21:09:58,651 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 21:09:58,651 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-11-20 21:09:58,652 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:09:58,652 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-11-20 21:09:58,652 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=969, Unknown=0, NotChecked=0, Total=1122 [2022-11-20 21:09:58,653 INFO L87 Difference]: Start difference. First operand 47 states and 56 transitions. Second operand has 24 states, 22 states have (on average 1.9545454545454546) internal successors, (43), 22 states have internal predecessors, (43), 5 states have call successors, (6), 5 states have call predecessors, (6), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-20 21:10:00,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:10:00,064 INFO L93 Difference]: Finished difference Result 106 states and 128 transitions. [2022-11-20 21:10:00,065 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-20 21:10:00,065 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 22 states have (on average 1.9545454545454546) internal successors, (43), 22 states have internal predecessors, (43), 5 states have call successors, (6), 5 states have call predecessors, (6), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 20 [2022-11-20 21:10:00,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:10:00,067 INFO L225 Difference]: With dead ends: 106 [2022-11-20 21:10:00,067 INFO L226 Difference]: Without dead ends: 64 [2022-11-20 21:10:00,069 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 27 SyntacticMatches, 5 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 527 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=242, Invalid=1564, Unknown=0, NotChecked=0, Total=1806 [2022-11-20 21:10:00,069 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 64 mSDsluCounter, 191 mSDsCounter, 0 mSdLazyCounter, 203 mSolverCounterSat, 57 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 214 SdHoareTripleChecker+Invalid, 389 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 57 IncrementalHoareTripleChecker+Valid, 203 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 129 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-20 21:10:00,070 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [67 Valid, 214 Invalid, 389 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [57 Valid, 203 Invalid, 0 Unknown, 129 Unchecked, 0.4s Time] [2022-11-20 21:10:00,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2022-11-20 21:10:00,084 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 50. [2022-11-20 21:10:00,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 39 states have (on average 1.1282051282051282) internal successors, (44), 40 states have internal predecessors, (44), 7 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) [2022-11-20 21:10:00,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 58 transitions. [2022-11-20 21:10:00,086 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 58 transitions. Word has length 20 [2022-11-20 21:10:00,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:10:00,087 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 58 transitions. [2022-11-20 21:10:00,087 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 22 states have (on average 1.9545454545454546) internal successors, (43), 22 states have internal predecessors, (43), 5 states have call successors, (6), 5 states have call predecessors, (6), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-20 21:10:00,087 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 58 transitions. [2022-11-20 21:10:00,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-11-20 21:10:00,088 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:10:00,088 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:10:00,094 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f90cf9c-d3c1-4f19-8ec3-11b009af6b06/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-20 21:10:00,294 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f90cf9c-d3c1-4f19-8ec3-11b009af6b06/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:10:00,294 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:10:00,295 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:10:00,295 INFO L85 PathProgramCache]: Analyzing trace with hash -71642885, now seen corresponding path program 3 times [2022-11-20 21:10:00,295 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:10:00,295 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [369826439] [2022-11-20 21:10:00,295 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:10:00,296 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:10:00,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:10:00,486 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-20 21:10:00,486 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:10:00,486 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [369826439] [2022-11-20 21:10:00,487 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [369826439] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:10:00,487 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2075317634] [2022-11-20 21:10:00,487 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-20 21:10:00,487 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:10:00,487 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f90cf9c-d3c1-4f19-8ec3-11b009af6b06/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:10:00,489 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f90cf9c-d3c1-4f19-8ec3-11b009af6b06/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:10:00,494 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f90cf9c-d3c1-4f19-8ec3-11b009af6b06/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-20 21:10:00,550 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-20 21:10:00,550 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 21:10:00,551 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 33 conjunts are in the unsatisfiable core [2022-11-20 21:10:00,554 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:10:00,571 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2022-11-20 21:10:00,620 INFO L321 Elim1Store]: treesize reduction 49, result has 23.4 percent of original size [2022-11-20 21:10:00,621 INFO L350 Elim1Store]: Elim1 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 36 [2022-11-20 21:10:00,715 INFO L321 Elim1Store]: treesize reduction 45, result has 25.0 percent of original size [2022-11-20 21:10:00,720 INFO L350 Elim1Store]: Elim1 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 41 treesize of output 40 [2022-11-20 21:10:03,386 INFO L321 Elim1Store]: treesize reduction 14, result has 17.6 percent of original size [2022-11-20 21:10:03,386 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 28 treesize of output 10 [2022-11-20 21:10:03,489 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:10:03,489 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:10:04,130 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 47 treesize of output 45 [2022-11-20 21:10:04,143 INFO L350 Elim1Store]: Elim1 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 930 treesize of output 914 [2022-11-20 21:10:04,331 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 21:10:04,332 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2075317634] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:10:04,332 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [701472318] [2022-11-20 21:10:04,334 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-20 21:10:04,334 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:10:04,335 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:10:04,335 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:10:04,335 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:10:04,348 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:10:04,363 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-20 21:10:04,363 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2022-11-20 21:10:04,373 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:10:04,390 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-20 21:10:04,391 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-20 21:10:04,410 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:10:04,412 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 53 treesize of output 55 [2022-11-20 21:10:04,458 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:10:04,462 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:10:04,466 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:10:04,491 INFO L321 Elim1Store]: treesize reduction 110, result has 6.0 percent of original size [2022-11-20 21:10:04,492 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 231 treesize of output 228 [2022-11-20 21:10:04,529 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 34 [2022-11-20 21:10:04,761 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 43 for LOIs [2022-11-20 21:10:04,814 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:10:06,231 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1133#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-20 21:10:06,231 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 21:10:06,232 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:10:06,232 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 12, 13] total 27 [2022-11-20 21:10:06,232 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [617117727] [2022-11-20 21:10:06,232 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 21:10:06,232 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-11-20 21:10:06,232 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:10:06,233 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-11-20 21:10:06,233 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=162, Invalid=1170, Unknown=0, NotChecked=0, Total=1332 [2022-11-20 21:10:06,234 INFO L87 Difference]: Start difference. First operand 50 states and 58 transitions. Second operand has 27 states, 25 states have (on average 1.84) internal successors, (46), 25 states have internal predecessors, (46), 5 states have call successors, (6), 5 states have call predecessors, (6), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-20 21:10:08,426 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:10:08,426 INFO L93 Difference]: Finished difference Result 110 states and 129 transitions. [2022-11-20 21:10:08,428 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-11-20 21:10:08,428 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 25 states have (on average 1.84) internal successors, (46), 25 states have internal predecessors, (46), 5 states have call successors, (6), 5 states have call predecessors, (6), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 21 [2022-11-20 21:10:08,428 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:10:08,429 INFO L225 Difference]: With dead ends: 110 [2022-11-20 21:10:08,429 INFO L226 Difference]: Without dead ends: 66 [2022-11-20 21:10:08,431 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 29 SyntacticMatches, 8 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 784 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=343, Invalid=2309, Unknown=0, NotChecked=0, Total=2652 [2022-11-20 21:10:08,431 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 105 mSDsluCounter, 175 mSDsCounter, 0 mSdLazyCounter, 298 mSolverCounterSat, 67 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 105 SdHoareTripleChecker+Valid, 195 SdHoareTripleChecker+Invalid, 489 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 67 IncrementalHoareTripleChecker+Valid, 298 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 124 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-20 21:10:08,432 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [105 Valid, 195 Invalid, 489 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [67 Valid, 298 Invalid, 0 Unknown, 124 Unchecked, 0.5s Time] [2022-11-20 21:10:08,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2022-11-20 21:10:08,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 53. [2022-11-20 21:10:08,453 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 42 states have (on average 1.0952380952380953) internal successors, (46), 43 states have internal predecessors, (46), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (6), 5 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-20 21:10:08,454 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 58 transitions. [2022-11-20 21:10:08,454 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 58 transitions. Word has length 21 [2022-11-20 21:10:08,454 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:10:08,455 INFO L495 AbstractCegarLoop]: Abstraction has 53 states and 58 transitions. [2022-11-20 21:10:08,455 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 25 states have (on average 1.84) internal successors, (46), 25 states have internal predecessors, (46), 5 states have call successors, (6), 5 states have call predecessors, (6), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-20 21:10:08,455 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 58 transitions. [2022-11-20 21:10:08,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-11-20 21:10:08,456 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:10:08,456 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 21:10:08,464 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f90cf9c-d3c1-4f19-8ec3-11b009af6b06/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2022-11-20 21:10:08,659 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f90cf9c-d3c1-4f19-8ec3-11b009af6b06/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:10:08,660 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:10:08,660 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:10:08,660 INFO L85 PathProgramCache]: Analyzing trace with hash -1726188810, now seen corresponding path program 1 times [2022-11-20 21:10:08,660 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:10:08,660 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2067301763] [2022-11-20 21:10:08,660 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:10:08,661 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:10:08,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:10:08,874 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 4 proven. 15 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-20 21:10:08,874 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:10:08,874 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2067301763] [2022-11-20 21:10:08,874 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2067301763] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:10:08,874 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1308848387] [2022-11-20 21:10:08,875 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:10:08,875 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:10:08,875 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f90cf9c-d3c1-4f19-8ec3-11b009af6b06/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:10:08,876 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f90cf9c-d3c1-4f19-8ec3-11b009af6b06/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:10:08,899 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f90cf9c-d3c1-4f19-8ec3-11b009af6b06/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-20 21:10:08,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:10:08,959 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 42 conjunts are in the unsatisfiable core [2022-11-20 21:10:08,962 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:10:08,987 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2022-11-20 21:10:09,036 INFO L321 Elim1Store]: treesize reduction 49, result has 23.4 percent of original size [2022-11-20 21:10:09,036 INFO L350 Elim1Store]: Elim1 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 36 [2022-11-20 21:10:09,110 INFO L321 Elim1Store]: treesize reduction 45, result has 25.0 percent of original size [2022-11-20 21:10:09,111 INFO L350 Elim1Store]: Elim1 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 41 treesize of output 40 [2022-11-20 21:10:14,323 INFO L321 Elim1Store]: treesize reduction 14, result has 17.6 percent of original size [2022-11-20 21:10:14,324 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 28 treesize of output 10 [2022-11-20 21:10:14,446 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 3 proven. 27 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 21:10:14,446 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:10:15,280 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 87 treesize of output 83 [2022-11-20 21:10:15,287 INFO L350 Elim1Store]: Elim1 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 954 treesize of output 922 [2022-11-20 21:10:15,732 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 4 proven. 23 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-20 21:10:15,732 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1308848387] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:10:15,732 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1247270098] [2022-11-20 21:10:15,734 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-11-20 21:10:15,734 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:10:15,735 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:10:15,735 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:10:15,735 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:10:15,755 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:10:15,769 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-20 21:10:15,769 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2022-11-20 21:10:15,777 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:10:15,793 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-20 21:10:15,793 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-20 21:10:15,810 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:10:15,811 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 53 treesize of output 55 [2022-11-20 21:10:15,858 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:10:15,862 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:10:15,867 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:10:15,895 INFO L321 Elim1Store]: treesize reduction 110, result has 6.0 percent of original size [2022-11-20 21:10:15,896 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 231 treesize of output 228 [2022-11-20 21:10:15,931 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 34 [2022-11-20 21:10:16,910 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 62 for LOIs [2022-11-20 21:10:16,990 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:10:18,649 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1617#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2022-11-20 21:10:18,649 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 21:10:18,650 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:10:18,650 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 16, 15] total 33 [2022-11-20 21:10:18,650 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2011933482] [2022-11-20 21:10:18,650 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 21:10:18,651 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-11-20 21:10:18,651 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:10:18,652 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-11-20 21:10:18,652 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=181, Invalid=1541, Unknown=0, NotChecked=0, Total=1722 [2022-11-20 21:10:18,653 INFO L87 Difference]: Start difference. First operand 53 states and 58 transitions. Second operand has 33 states, 31 states have (on average 1.935483870967742) internal successors, (60), 31 states have internal predecessors, (60), 7 states have call successors, (9), 5 states have call predecessors, (9), 3 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2022-11-20 21:10:22,386 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:10:22,386 INFO L93 Difference]: Finished difference Result 133 states and 154 transitions. [2022-11-20 21:10:22,387 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-11-20 21:10:22,387 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 31 states have (on average 1.935483870967742) internal successors, (60), 31 states have internal predecessors, (60), 7 states have call successors, (9), 5 states have call predecessors, (9), 3 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) Word has length 31 [2022-11-20 21:10:22,387 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:10:22,388 INFO L225 Difference]: With dead ends: 133 [2022-11-20 21:10:22,388 INFO L226 Difference]: Without dead ends: 87 [2022-11-20 21:10:22,390 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 47 SyntacticMatches, 16 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1311 ImplicationChecksByTransitivity, 9.7s TimeCoverageRelationStatistics Valid=435, Invalid=3347, Unknown=0, NotChecked=0, Total=3782 [2022-11-20 21:10:22,391 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 142 mSDsluCounter, 245 mSDsCounter, 0 mSdLazyCounter, 491 mSolverCounterSat, 88 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 142 SdHoareTripleChecker+Valid, 271 SdHoareTripleChecker+Invalid, 855 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 88 IncrementalHoareTripleChecker+Valid, 491 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 276 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-20 21:10:22,391 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [142 Valid, 271 Invalid, 855 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [88 Valid, 491 Invalid, 0 Unknown, 276 Unchecked, 0.8s Time] [2022-11-20 21:10:22,392 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2022-11-20 21:10:22,417 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 79. [2022-11-20 21:10:22,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 62 states have (on average 1.1129032258064515) internal successors, (69), 64 states have internal predecessors, (69), 11 states have call successors, (11), 5 states have call predecessors, (11), 5 states have return successors, (11), 9 states have call predecessors, (11), 11 states have call successors, (11) [2022-11-20 21:10:22,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 91 transitions. [2022-11-20 21:10:22,419 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 91 transitions. Word has length 31 [2022-11-20 21:10:22,420 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:10:22,420 INFO L495 AbstractCegarLoop]: Abstraction has 79 states and 91 transitions. [2022-11-20 21:10:22,420 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 31 states have (on average 1.935483870967742) internal successors, (60), 31 states have internal predecessors, (60), 7 states have call successors, (9), 5 states have call predecessors, (9), 3 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2022-11-20 21:10:22,420 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 91 transitions. [2022-11-20 21:10:22,421 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-11-20 21:10:22,421 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:10:22,421 INFO L195 NwaCegarLoop]: trace histogram [6, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2022-11-20 21:10:22,432 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f90cf9c-d3c1-4f19-8ec3-11b009af6b06/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-20 21:10:22,627 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f90cf9c-d3c1-4f19-8ec3-11b009af6b06/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:10:22,627 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:10:22,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:10:22,628 INFO L85 PathProgramCache]: Analyzing trace with hash -826032737, now seen corresponding path program 2 times [2022-11-20 21:10:22,628 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:10:22,628 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [322527637] [2022-11-20 21:10:22,628 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:10:22,628 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:10:22,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:10:22,901 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-11-20 21:10:22,902 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:10:22,902 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [322527637] [2022-11-20 21:10:22,902 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [322527637] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:10:22,902 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1738208930] [2022-11-20 21:10:22,902 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 21:10:22,902 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:10:22,903 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f90cf9c-d3c1-4f19-8ec3-11b009af6b06/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:10:22,904 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f90cf9c-d3c1-4f19-8ec3-11b009af6b06/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:10:22,931 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f90cf9c-d3c1-4f19-8ec3-11b009af6b06/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-20 21:10:23,497 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-20 21:10:23,497 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 21:10:23,499 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 15 conjunts are in the unsatisfiable core [2022-11-20 21:10:23,500 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:10:23,538 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-20 21:10:23,538 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:10:23,669 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-11-20 21:10:23,669 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1738208930] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 21:10:23,669 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2046414166] [2022-11-20 21:10:23,671 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-11-20 21:10:23,672 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 21:10:23,672 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 21:10:23,672 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 21:10:23,672 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 21:10:23,685 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:10:23,705 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-20 21:10:23,705 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-20 21:10:23,714 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:10:23,715 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-11-20 21:10:23,729 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:10:23,731 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-20 21:10:23,782 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 21:10:23,783 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-20 21:10:23,822 INFO L321 Elim1Store]: treesize reduction 119, result has 25.2 percent of original size [2022-11-20 21:10:23,822 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 199 treesize of output 221 [2022-11-20 21:10:23,864 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 34 [2022-11-20 21:10:24,916 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 62 for LOIs [2022-11-20 21:10:24,990 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 21:10:26,172 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2223#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-20 21:10:26,172 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 21:10:26,172 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 21:10:26,172 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 9] total 17 [2022-11-20 21:10:26,172 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1839809819] [2022-11-20 21:10:26,173 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 21:10:26,173 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-11-20 21:10:26,173 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 21:10:26,174 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-11-20 21:10:26,174 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=525, Unknown=0, NotChecked=0, Total=650 [2022-11-20 21:10:26,174 INFO L87 Difference]: Start difference. First operand 79 states and 91 transitions. Second operand has 17 states, 17 states have (on average 1.8823529411764706) internal successors, (32), 17 states have internal predecessors, (32), 1 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2022-11-20 21:10:27,475 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 21:10:27,475 INFO L93 Difference]: Finished difference Result 209 states and 261 transitions. [2022-11-20 21:10:27,476 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-20 21:10:27,476 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.8823529411764706) internal successors, (32), 17 states have internal predecessors, (32), 1 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 41 [2022-11-20 21:10:27,477 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 21:10:27,478 INFO L225 Difference]: With dead ends: 209 [2022-11-20 21:10:27,478 INFO L226 Difference]: Without dead ends: 138 [2022-11-20 21:10:27,479 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 94 SyntacticMatches, 12 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 339 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=227, Invalid=765, Unknown=0, NotChecked=0, Total=992 [2022-11-20 21:10:27,480 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 191 mSDsluCounter, 151 mSDsCounter, 0 mSdLazyCounter, 325 mSolverCounterSat, 127 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 199 SdHoareTripleChecker+Valid, 185 SdHoareTripleChecker+Invalid, 452 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 127 IncrementalHoareTripleChecker+Valid, 325 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-20 21:10:27,480 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [199 Valid, 185 Invalid, 452 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [127 Valid, 325 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-20 21:10:27,481 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2022-11-20 21:10:27,517 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 86. [2022-11-20 21:10:27,518 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 70 states have (on average 1.0714285714285714) internal successors, (75), 71 states have internal predecessors, (75), 10 states have call successors, (10), 5 states have call predecessors, (10), 5 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2022-11-20 21:10:27,519 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 95 transitions. [2022-11-20 21:10:27,519 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 95 transitions. Word has length 41 [2022-11-20 21:10:27,519 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 21:10:27,519 INFO L495 AbstractCegarLoop]: Abstraction has 86 states and 95 transitions. [2022-11-20 21:10:27,519 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.8823529411764706) internal successors, (32), 17 states have internal predecessors, (32), 1 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2022-11-20 21:10:27,520 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 95 transitions. [2022-11-20 21:10:27,521 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-11-20 21:10:27,521 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 21:10:27,521 INFO L195 NwaCegarLoop]: trace histogram [14, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2022-11-20 21:10:27,532 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f90cf9c-d3c1-4f19-8ec3-11b009af6b06/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-20 21:10:27,727 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f90cf9c-d3c1-4f19-8ec3-11b009af6b06/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:10:27,727 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 21:10:27,727 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 21:10:27,728 INFO L85 PathProgramCache]: Analyzing trace with hash 242249631, now seen corresponding path program 3 times [2022-11-20 21:10:27,728 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 21:10:27,728 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [251409319] [2022-11-20 21:10:27,728 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 21:10:27,728 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 21:10:27,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 21:10:28,332 INFO L134 CoverageAnalysis]: Checked inductivity of 141 backedges. 6 proven. 105 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-11-20 21:10:28,333 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 21:10:28,333 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [251409319] [2022-11-20 21:10:28,333 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [251409319] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 21:10:28,333 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1248669111] [2022-11-20 21:10:28,333 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-20 21:10:28,333 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 21:10:28,333 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f90cf9c-d3c1-4f19-8ec3-11b009af6b06/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 21:10:28,334 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f90cf9c-d3c1-4f19-8ec3-11b009af6b06/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 21:10:28,337 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f90cf9c-d3c1-4f19-8ec3-11b009af6b06/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-20 21:10:28,483 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-20 21:10:28,483 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 21:10:28,487 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 87 conjunts are in the unsatisfiable core [2022-11-20 21:10:28,492 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 21:10:28,512 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2022-11-20 21:10:28,572 INFO L321 Elim1Store]: treesize reduction 49, result has 23.4 percent of original size [2022-11-20 21:10:28,573 INFO L350 Elim1Store]: Elim1 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 36 [2022-11-20 21:10:28,636 INFO L321 Elim1Store]: treesize reduction 49, result has 23.4 percent of original size [2022-11-20 21:10:28,637 INFO L350 Elim1Store]: Elim1 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 39 treesize of output 38 [2022-11-20 21:10:28,712 INFO L321 Elim1Store]: treesize reduction 49, result has 23.4 percent of original size [2022-11-20 21:10:28,712 INFO L350 Elim1Store]: Elim1 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 36 [2022-11-20 21:10:28,794 INFO L321 Elim1Store]: treesize reduction 49, result has 23.4 percent of original size [2022-11-20 21:10:28,795 INFO L350 Elim1Store]: Elim1 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 39 treesize of output 38 [2022-11-20 21:10:28,867 INFO L321 Elim1Store]: treesize reduction 49, result has 23.4 percent of original size [2022-11-20 21:10:28,868 INFO L350 Elim1Store]: Elim1 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 36 [2022-11-20 21:10:28,945 INFO L321 Elim1Store]: treesize reduction 49, result has 23.4 percent of original size [2022-11-20 21:10:28,946 INFO L350 Elim1Store]: Elim1 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 39 treesize of output 38 [2022-11-20 21:10:29,028 INFO L321 Elim1Store]: treesize reduction 49, result has 23.4 percent of original size [2022-11-20 21:10:29,029 INFO L350 Elim1Store]: Elim1 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 36 [2022-11-20 21:10:29,108 INFO L321 Elim1Store]: treesize reduction 49, result has 23.4 percent of original size [2022-11-20 21:10:29,108 INFO L350 Elim1Store]: Elim1 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 39 treesize of output 38 [2022-11-20 21:10:29,187 INFO L321 Elim1Store]: treesize reduction 49, result has 23.4 percent of original size [2022-11-20 21:10:29,187 INFO L350 Elim1Store]: Elim1 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 36 [2022-11-20 21:10:29,275 INFO L321 Elim1Store]: treesize reduction 62, result has 22.5 percent of original size [2022-11-20 21:10:29,276 INFO L350 Elim1Store]: Elim1 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 40 treesize of output 39 [2022-11-20 21:10:50,997 INFO L321 Elim1Store]: treesize reduction 14, result has 17.6 percent of original size [2022-11-20 21:10:50,997 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 28 treesize of output 10 [2022-11-20 21:10:51,160 INFO L134 CoverageAnalysis]: Checked inductivity of 141 backedges. 6 proven. 129 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-20 21:10:51,160 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 21:11:10,394 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 135 treesize of output 133