./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-examples/standard_partition_original_ground.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 38b53e6a 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_263a91de-7b08-47bf-a4ae-41a479322afc/bin/utaipan-ByfvJB40ur/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_263a91de-7b08-47bf-a4ae-41a479322afc/bin/utaipan-ByfvJB40ur/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_263a91de-7b08-47bf-a4ae-41a479322afc/bin/utaipan-ByfvJB40ur/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_263a91de-7b08-47bf-a4ae-41a479322afc/bin/utaipan-ByfvJB40ur/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-examples/standard_partition_original_ground.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_263a91de-7b08-47bf-a4ae-41a479322afc/bin/utaipan-ByfvJB40ur/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_263a91de-7b08-47bf-a4ae-41a479322afc/bin/utaipan-ByfvJB40ur --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 7c423fd522e95226e38270ab4d82928946afe4ab8940cfd611684a61e552aff6 --- 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-38b53e6 [2022-11-25 23:18:13,969 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-25 23:18:13,972 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-25 23:18:14,016 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-25 23:18:14,016 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-25 23:18:14,017 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-25 23:18:14,019 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-25 23:18:14,021 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-25 23:18:14,022 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-25 23:18:14,027 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-25 23:18:14,028 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-25 23:18:14,032 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-25 23:18:14,033 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-25 23:18:14,038 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-25 23:18:14,041 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-25 23:18:14,043 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-25 23:18:14,045 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-25 23:18:14,047 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-25 23:18:14,049 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-25 23:18:14,055 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-25 23:18:14,056 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-25 23:18:14,059 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-25 23:18:14,061 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-25 23:18:14,062 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-25 23:18:14,071 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-25 23:18:14,072 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-25 23:18:14,072 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-25 23:18:14,074 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-25 23:18:14,074 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-25 23:18:14,075 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-25 23:18:14,075 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-25 23:18:14,076 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-25 23:18:14,078 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-25 23:18:14,079 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-25 23:18:14,081 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-25 23:18:14,082 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-25 23:18:14,083 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-25 23:18:14,083 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-25 23:18:14,083 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-25 23:18:14,084 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-25 23:18:14,085 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-25 23:18:14,086 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_263a91de-7b08-47bf-a4ae-41a479322afc/bin/utaipan-ByfvJB40ur/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-25 23:18:14,126 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-25 23:18:14,126 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-25 23:18:14,127 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-25 23:18:14,127 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-25 23:18:14,128 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-25 23:18:14,128 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-25 23:18:14,128 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-25 23:18:14,128 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-25 23:18:14,129 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-25 23:18:14,129 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-25 23:18:14,130 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-25 23:18:14,130 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-25 23:18:14,130 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-25 23:18:14,130 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-25 23:18:14,130 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-25 23:18:14,131 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-25 23:18:14,131 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-25 23:18:14,131 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-25 23:18:14,132 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-25 23:18:14,132 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-25 23:18:14,132 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-25 23:18:14,132 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-25 23:18:14,132 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-25 23:18:14,133 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-25 23:18:14,133 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-25 23:18:14,133 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-25 23:18:14,133 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-25 23:18:14,133 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-25 23:18:14,134 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-25 23:18:14,134 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-25 23:18:14,134 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-25 23:18:14,134 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-25 23:18:14,134 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-25 23:18:14,135 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-25 23:18:14,135 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-25 23:18:14,135 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-25 23:18:14,135 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-25 23:18:14,135 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-25 23:18:14,136 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-25 23:18:14,136 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-25 23:18:14,136 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-25 23:18:14,136 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_263a91de-7b08-47bf-a4ae-41a479322afc/bin/utaipan-ByfvJB40ur/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_263a91de-7b08-47bf-a4ae-41a479322afc/bin/utaipan-ByfvJB40ur Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 7c423fd522e95226e38270ab4d82928946afe4ab8940cfd611684a61e552aff6 [2022-11-25 23:18:14,401 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-25 23:18:14,431 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-25 23:18:14,434 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-25 23:18:14,435 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-25 23:18:14,436 INFO L275 PluginConnector]: CDTParser initialized [2022-11-25 23:18:14,437 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_263a91de-7b08-47bf-a4ae-41a479322afc/bin/utaipan-ByfvJB40ur/../../sv-benchmarks/c/array-examples/standard_partition_original_ground.i [2022-11-25 23:18:17,435 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-25 23:18:17,682 INFO L351 CDTParser]: Found 1 translation units. [2022-11-25 23:18:17,683 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_263a91de-7b08-47bf-a4ae-41a479322afc/sv-benchmarks/c/array-examples/standard_partition_original_ground.i [2022-11-25 23:18:17,690 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_263a91de-7b08-47bf-a4ae-41a479322afc/bin/utaipan-ByfvJB40ur/data/570085258/ec3bae2ab5b14e63a290118275ad2c13/FLAG47d384602 [2022-11-25 23:18:17,710 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_263a91de-7b08-47bf-a4ae-41a479322afc/bin/utaipan-ByfvJB40ur/data/570085258/ec3bae2ab5b14e63a290118275ad2c13 [2022-11-25 23:18:17,712 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-25 23:18:17,714 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-25 23:18:17,718 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-25 23:18:17,718 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-25 23:18:17,722 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-25 23:18:17,723 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 11:18:17" (1/1) ... [2022-11-25 23:18:17,724 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@512c741 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:18:17, skipping insertion in model container [2022-11-25 23:18:17,725 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 11:18:17" (1/1) ... [2022-11-25 23:18:17,733 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-25 23:18:17,756 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-25 23:18:17,925 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_263a91de-7b08-47bf-a4ae-41a479322afc/sv-benchmarks/c/array-examples/standard_partition_original_ground.i[827,840] [2022-11-25 23:18:17,940 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-25 23:18:17,948 INFO L203 MainTranslator]: Completed pre-run [2022-11-25 23:18:17,959 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_263a91de-7b08-47bf-a4ae-41a479322afc/sv-benchmarks/c/array-examples/standard_partition_original_ground.i[827,840] [2022-11-25 23:18:17,967 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-25 23:18:17,981 INFO L208 MainTranslator]: Completed translation [2022-11-25 23:18:17,982 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:18:17 WrapperNode [2022-11-25 23:18:17,982 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-25 23:18:17,983 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-25 23:18:17,983 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-25 23:18:17,983 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-25 23:18:17,991 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:18:17" (1/1) ... [2022-11-25 23:18:18,013 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:18:17" (1/1) ... [2022-11-25 23:18:18,028 INFO L138 Inliner]: procedures = 16, calls = 25, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 80 [2022-11-25 23:18:18,029 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-25 23:18:18,030 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-25 23:18:18,030 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-25 23:18:18,030 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-25 23:18:18,039 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:18:17" (1/1) ... [2022-11-25 23:18:18,040 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:18:17" (1/1) ... [2022-11-25 23:18:18,042 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:18:17" (1/1) ... [2022-11-25 23:18:18,042 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:18:17" (1/1) ... [2022-11-25 23:18:18,048 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:18:17" (1/1) ... [2022-11-25 23:18:18,052 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:18:17" (1/1) ... [2022-11-25 23:18:18,053 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:18:17" (1/1) ... [2022-11-25 23:18:18,054 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:18:17" (1/1) ... [2022-11-25 23:18:18,056 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-25 23:18:18,057 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-25 23:18:18,057 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-25 23:18:18,057 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-25 23:18:18,063 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:18:17" (1/1) ... [2022-11-25 23:18:18,070 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-25 23:18:18,081 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_263a91de-7b08-47bf-a4ae-41a479322afc/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:18:18,097 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_263a91de-7b08-47bf-a4ae-41a479322afc/bin/utaipan-ByfvJB40ur/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-25 23:18:18,099 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_263a91de-7b08-47bf-a4ae-41a479322afc/bin/utaipan-ByfvJB40ur/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-25 23:18:18,141 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-25 23:18:18,142 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-25 23:18:18,142 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-11-25 23:18:18,142 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-11-25 23:18:18,142 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-25 23:18:18,142 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-25 23:18:18,143 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-11-25 23:18:18,143 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-11-25 23:18:18,143 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-11-25 23:18:18,143 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-11-25 23:18:18,228 INFO L235 CfgBuilder]: Building ICFG [2022-11-25 23:18:18,230 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-25 23:18:18,442 INFO L276 CfgBuilder]: Performing block encoding [2022-11-25 23:18:18,519 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-25 23:18:18,520 INFO L300 CfgBuilder]: Removed 4 assume(true) statements. [2022-11-25 23:18:18,522 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 11:18:18 BoogieIcfgContainer [2022-11-25 23:18:18,522 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-25 23:18:18,525 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-25 23:18:18,525 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-25 23:18:18,528 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-25 23:18:18,528 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 11:18:17" (1/3) ... [2022-11-25 23:18:18,529 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@50b86352 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 11:18:18, skipping insertion in model container [2022-11-25 23:18:18,529 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:18:17" (2/3) ... [2022-11-25 23:18:18,530 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@50b86352 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 11:18:18, skipping insertion in model container [2022-11-25 23:18:18,530 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 11:18:18" (3/3) ... [2022-11-25 23:18:18,531 INFO L112 eAbstractionObserver]: Analyzing ICFG standard_partition_original_ground.i [2022-11-25 23:18:18,550 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-25 23:18:18,551 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-25 23:18:18,599 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-25 23:18:18,607 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;@3c9b447c, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-25 23:18:18,607 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-25 23:18:18,611 INFO L276 IsEmpty]: Start isEmpty. Operand has 16 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 12 states have internal predecessors, (17), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-25 23:18:18,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-11-25 23:18:18,618 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:18:18,619 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:18:18,619 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:18:18,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:18:18,625 INFO L85 PathProgramCache]: Analyzing trace with hash 835345387, now seen corresponding path program 1 times [2022-11-25 23:18:18,634 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:18:18,635 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1556992190] [2022-11-25 23:18:18,635 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:18:18,636 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:18:18,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:18:18,882 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:18:18,883 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:18:18,883 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1556992190] [2022-11-25 23:18:18,884 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1556992190] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 23:18:18,884 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 23:18:18,884 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-25 23:18:18,886 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1021015090] [2022-11-25 23:18:18,887 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:18:18,891 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-25 23:18:18,892 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:18:18,921 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-25 23:18:18,922 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-25 23:18:18,924 INFO L87 Difference]: Start difference. First operand has 16 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 12 states have internal predecessors, (17), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:18:18,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:18:18,994 INFO L93 Difference]: Finished difference Result 31 states and 43 transitions. [2022-11-25 23:18:18,999 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-25 23:18:19,000 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 [2022-11-25 23:18:19,001 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:18:19,007 INFO L225 Difference]: With dead ends: 31 [2022-11-25 23:18:19,008 INFO L226 Difference]: Without dead ends: 16 [2022-11-25 23:18:19,011 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 [2022-11-25 23:18:19,014 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 0 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 17 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-25 23:18:19,015 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 22 Invalid, 17 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-25 23:18:19,033 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2022-11-25 23:18:19,056 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2022-11-25 23:18:19,057 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 12 states have (on average 1.3333333333333333) 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) [2022-11-25 23:18:19,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 20 transitions. [2022-11-25 23:18:19,061 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 20 transitions. Word has length 8 [2022-11-25 23:18:19,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:18:19,062 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 20 transitions. [2022-11-25 23:18:19,063 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) [2022-11-25 23:18:19,064 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 20 transitions. [2022-11-25 23:18:19,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-25 23:18:19,065 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:18:19,066 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:18:19,066 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-25 23:18:19,067 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:18:19,068 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:18:19,069 INFO L85 PathProgramCache]: Analyzing trace with hash -1181537117, now seen corresponding path program 1 times [2022-11-25 23:18:19,069 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:18:19,070 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [620109412] [2022-11-25 23:18:19,070 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:18:19,070 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:18:19,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:18:19,253 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:18:19,253 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:18:19,254 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [620109412] [2022-11-25 23:18:19,254 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [620109412] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:18:19,254 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [872803374] [2022-11-25 23:18:19,254 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:18:19,275 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:18:19,275 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_263a91de-7b08-47bf-a4ae-41a479322afc/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:18:19,279 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_263a91de-7b08-47bf-a4ae-41a479322afc/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:18:19,307 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_263a91de-7b08-47bf-a4ae-41a479322afc/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-25 23:18:19,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:18:19,399 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-25 23:18:19,404 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:18:19,434 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-25 23:18:19,437 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-25 23:18:19,442 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [872803374] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 23:18:19,443 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-25 23:18:19,443 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [3] total 4 [2022-11-25 23:18:19,444 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1837099] [2022-11-25 23:18:19,446 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:18:19,447 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-25 23:18:19,449 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:18:19,450 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-25 23:18:19,451 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-25 23:18:19,452 INFO L87 Difference]: Start difference. First operand 16 states and 20 transitions. Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 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) [2022-11-25 23:18:19,489 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:18:19,490 INFO L93 Difference]: Finished difference Result 29 states and 36 transitions. [2022-11-25 23:18:19,492 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-25 23:18:19,500 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 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 9 [2022-11-25 23:18:19,500 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:18:19,501 INFO L225 Difference]: With dead ends: 29 [2022-11-25 23:18:19,501 INFO L226 Difference]: Without dead ends: 17 [2022-11-25 23:18:19,501 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-25 23:18:19,503 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 0 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-25 23:18:19,503 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 22 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-25 23:18:19,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2022-11-25 23:18:19,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2022-11-25 23:18:19,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 13 states have (on average 1.3076923076923077) internal successors, (17), 13 states have internal predecessors, (17), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-25 23:18:19,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 21 transitions. [2022-11-25 23:18:19,520 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 21 transitions. Word has length 9 [2022-11-25 23:18:19,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:18:19,521 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 21 transitions. [2022-11-25 23:18:19,521 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 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) [2022-11-25 23:18:19,521 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 21 transitions. [2022-11-25 23:18:19,522 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-11-25 23:18:19,522 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:18:19,522 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:18:19,535 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_263a91de-7b08-47bf-a4ae-41a479322afc/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-25 23:18:19,723 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_263a91de-7b08-47bf-a4ae-41a479322afc/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:18:19,723 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:18:19,724 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:18:19,724 INFO L85 PathProgramCache]: Analyzing trace with hash 15951130, now seen corresponding path program 1 times [2022-11-25 23:18:19,724 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:18:19,725 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [670145953] [2022-11-25 23:18:19,725 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:18:19,725 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:18:19,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:18:19,874 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-25 23:18:19,875 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:18:19,875 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [670145953] [2022-11-25 23:18:19,875 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [670145953] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:18:19,875 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1371704042] [2022-11-25 23:18:19,876 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:18:19,876 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:18:19,876 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_263a91de-7b08-47bf-a4ae-41a479322afc/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:18:19,881 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_263a91de-7b08-47bf-a4ae-41a479322afc/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:18:19,883 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_263a91de-7b08-47bf-a4ae-41a479322afc/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-25 23:18:19,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:18:19,952 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-25 23:18:19,953 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:18:19,988 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-25 23:18:19,989 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:18:20,009 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-25 23:18:20,010 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1371704042] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:18:20,010 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1931336526] [2022-11-25 23:18:20,029 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-25 23:18:20,029 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:18:20,033 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:18:20,038 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:18:20,039 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:18:20,108 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:20,110 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:20,111 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:20,188 INFO L321 Elim1Store]: treesize reduction 83, result has 23.9 percent of original size [2022-11-25 23:18:20,189 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 23 treesize of output 42 [2022-11-25 23:18:20,219 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:20,223 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:20,225 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:20,308 INFO L321 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2022-11-25 23:18:20,308 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 9 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 55 treesize of output 73 [2022-11-25 23:18:20,374 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:20,376 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 6 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 [2022-11-25 23:18:20,720 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:20,722 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:18:20,761 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-25 23:18:20,762 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 324 treesize of output 323 [2022-11-25 23:18:21,096 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 16 treesize of output 12 [2022-11-25 23:18:21,136 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:18:21,148 INFO L321 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2022-11-25 23:18:21,149 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 34 treesize of output 24 [2022-11-25 23:18:21,161 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:18:21,173 INFO L321 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2022-11-25 23:18:21,174 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 33 treesize of output 23 [2022-11-25 23:18:21,288 INFO L321 Elim1Store]: treesize reduction 94, result has 21.0 percent of original size [2022-11-25 23:18:21,288 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 98 treesize of output 98 [2022-11-25 23:18:21,472 INFO L321 Elim1Store]: treesize reduction 39, result has 35.0 percent of original size [2022-11-25 23:18:21,473 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 88 treesize of output 85 [2022-11-25 23:18:21,490 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 16 treesize of output 10 [2022-11-25 23:18:21,514 INFO L321 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2022-11-25 23:18:21,515 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 65 treesize of output 31 [2022-11-25 23:18:21,542 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-25 23:18:21,545 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 70 treesize of output 53 [2022-11-25 23:18:21,681 INFO L321 Elim1Store]: treesize reduction 94, result has 21.0 percent of original size [2022-11-25 23:18:21,683 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 98 treesize of output 98 [2022-11-25 23:18:21,785 INFO L321 Elim1Store]: treesize reduction 39, result has 35.0 percent of original size [2022-11-25 23:18:21,785 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 88 treesize of output 85 [2022-11-25 23:18:21,797 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 16 treesize of output 10 [2022-11-25 23:18:21,815 INFO L321 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2022-11-25 23:18:21,816 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 65 treesize of output 31 [2022-11-25 23:18:21,834 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-25 23:18:21,834 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 70 treesize of output 53 [2022-11-25 23:18:21,870 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 20 for LOIs [2022-11-25 23:18:21,892 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:18:22,169 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '250#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (exists ((|v_ULTIMATE.start_main_~#bb~0#1.base_BEFORE_CALL_1| Int)) (and (= (ite (<= 0 (select (select |#memory_int| |v_ULTIMATE.start_main_~#bb~0#1.base_BEFORE_CALL_1|) 0)) 1 0) |__VERIFIER_assert_#in~cond|) (<= 0 |v_ULTIMATE.start_main_~#bb~0#1.base_BEFORE_CALL_1|))) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:18:22,169 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:18:22,169 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:18:22,170 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2022-11-25 23:18:22,170 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [358883510] [2022-11-25 23:18:22,170 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:18:22,170 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-25 23:18:22,170 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:18:22,171 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-25 23:18:22,171 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=141, Unknown=0, NotChecked=0, Total=182 [2022-11-25 23:18:22,172 INFO L87 Difference]: Start difference. First operand 17 states and 21 transitions. Second operand has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:18:22,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:18:22,210 INFO L93 Difference]: Finished difference Result 34 states and 44 transitions. [2022-11-25 23:18:22,211 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-25 23:18:22,211 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2022-11-25 23:18:22,211 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:18:22,213 INFO L225 Difference]: With dead ends: 34 [2022-11-25 23:18:22,213 INFO L226 Difference]: Without dead ends: 20 [2022-11-25 23:18:22,214 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=41, Invalid=141, Unknown=0, NotChecked=0, Total=182 [2022-11-25 23:18:22,217 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 0 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-25 23:18:22,219 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 44 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-25 23:18:22,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2022-11-25 23:18:22,227 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2022-11-25 23:18:22,227 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 16 states have (on average 1.25) internal successors, (20), 16 states have internal predecessors, (20), 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) [2022-11-25 23:18:22,229 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 24 transitions. [2022-11-25 23:18:22,231 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 24 transitions. Word has length 10 [2022-11-25 23:18:22,233 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:18:22,234 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 24 transitions. [2022-11-25 23:18:22,234 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:18:22,234 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 24 transitions. [2022-11-25 23:18:22,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-25 23:18:22,236 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:18:22,236 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:18:22,245 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_263a91de-7b08-47bf-a4ae-41a479322afc/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-11-25 23:18:22,442 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_263a91de-7b08-47bf-a4ae-41a479322afc/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:18:22,442 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:18:22,443 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:18:22,443 INFO L85 PathProgramCache]: Analyzing trace with hash -52072238, now seen corresponding path program 2 times [2022-11-25 23:18:22,443 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:18:22,443 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [910947379] [2022-11-25 23:18:22,443 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:18:22,444 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:18:22,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:18:22,571 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-25 23:18:22,571 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:18:22,571 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [910947379] [2022-11-25 23:18:22,572 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [910947379] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:18:22,572 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [656499605] [2022-11-25 23:18:22,572 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:18:22,572 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:18:22,573 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_263a91de-7b08-47bf-a4ae-41a479322afc/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:18:22,574 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_263a91de-7b08-47bf-a4ae-41a479322afc/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:18:22,595 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_263a91de-7b08-47bf-a4ae-41a479322afc/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-25 23:18:22,663 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-25 23:18:22,663 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:18:22,664 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-25 23:18:22,666 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:18:22,695 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-25 23:18:22,696 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:18:22,717 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-25 23:18:22,717 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [656499605] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:18:22,717 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1758538217] [2022-11-25 23:18:22,719 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-25 23:18:22,719 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:18:22,720 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:18:22,720 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:18:22,720 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:18:22,737 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:22,739 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:22,740 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:22,820 INFO L321 Elim1Store]: treesize reduction 83, result has 23.9 percent of original size [2022-11-25 23:18:22,821 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 23 treesize of output 42 [2022-11-25 23:18:22,845 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:22,849 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:22,852 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:22,931 INFO L321 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2022-11-25 23:18:22,932 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 9 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 55 treesize of output 73 [2022-11-25 23:18:22,988 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:22,989 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 6 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 [2022-11-25 23:18:23,115 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:23,117 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:18:23,145 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-25 23:18:23,146 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 324 treesize of output 323 [2022-11-25 23:18:23,344 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 16 treesize of output 12 [2022-11-25 23:18:23,386 INFO L321 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-11-25 23:18:23,386 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 24 treesize of output 19 [2022-11-25 23:18:23,406 INFO L321 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-11-25 23:18:23,406 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 23 treesize of output 18 [2022-11-25 23:18:23,484 INFO L321 Elim1Store]: treesize reduction 94, result has 21.0 percent of original size [2022-11-25 23:18:23,485 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 98 treesize of output 98 [2022-11-25 23:18:23,623 INFO L321 Elim1Store]: treesize reduction 39, result has 35.0 percent of original size [2022-11-25 23:18:23,623 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 55 treesize of output 58 [2022-11-25 23:18:23,636 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 18 treesize of output 12 [2022-11-25 23:18:23,653 INFO L321 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2022-11-25 23:18:23,653 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 38 treesize of output 25 [2022-11-25 23:18:23,748 INFO L321 Elim1Store]: treesize reduction 94, result has 21.0 percent of original size [2022-11-25 23:18:23,748 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 98 treesize of output 98 [2022-11-25 23:18:23,817 INFO L321 Elim1Store]: treesize reduction 39, result has 35.0 percent of original size [2022-11-25 23:18:23,821 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 88 treesize of output 85 [2022-11-25 23:18:23,831 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 16 treesize of output 10 [2022-11-25 23:18:23,849 INFO L321 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2022-11-25 23:18:23,850 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 65 treesize of output 31 [2022-11-25 23:18:23,869 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-25 23:18:23,869 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 70 treesize of output 53 [2022-11-25 23:18:23,915 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 20 for LOIs [2022-11-25 23:18:23,935 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:18:24,194 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '421#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (exists ((|v_ULTIMATE.start_main_~#bb~0#1.base_BEFORE_CALL_2| Int)) (and (<= 0 |v_ULTIMATE.start_main_~#bb~0#1.base_BEFORE_CALL_2|) (= (ite (<= 0 (select (select |#memory_int| |v_ULTIMATE.start_main_~#bb~0#1.base_BEFORE_CALL_2|) 0)) 1 0) |__VERIFIER_assert_#in~cond|))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:18:24,195 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:18:24,195 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:18:24,195 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2022-11-25 23:18:24,195 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [771675808] [2022-11-25 23:18:24,195 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:18:24,196 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-25 23:18:24,196 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:18:24,196 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-25 23:18:24,197 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2022-11-25 23:18:24,197 INFO L87 Difference]: Start difference. First operand 20 states and 24 transitions. Second operand has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 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) [2022-11-25 23:18:24,229 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:18:24,229 INFO L93 Difference]: Finished difference Result 35 states and 44 transitions. [2022-11-25 23:18:24,229 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-25 23:18:24,230 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 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 13 [2022-11-25 23:18:24,230 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:18:24,230 INFO L225 Difference]: With dead ends: 35 [2022-11-25 23:18:24,231 INFO L226 Difference]: Without dead ends: 23 [2022-11-25 23:18:24,231 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2022-11-25 23:18:24,232 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 0 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-25 23:18:24,233 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 33 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-25 23:18:24,233 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2022-11-25 23:18:24,236 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2022-11-25 23:18:24,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 19 states have (on average 1.2105263157894737) internal successors, (23), 19 states have internal predecessors, (23), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-25 23:18:24,238 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 27 transitions. [2022-11-25 23:18:24,238 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 27 transitions. Word has length 13 [2022-11-25 23:18:24,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:18:24,238 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 27 transitions. [2022-11-25 23:18:24,238 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 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) [2022-11-25 23:18:24,239 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 27 transitions. [2022-11-25 23:18:24,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-11-25 23:18:24,239 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:18:24,239 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:18:24,247 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_263a91de-7b08-47bf-a4ae-41a479322afc/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-25 23:18:24,445 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_263a91de-7b08-47bf-a4ae-41a479322afc/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:18:24,446 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:18:24,446 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:18:24,447 INFO L85 PathProgramCache]: Analyzing trace with hash -667235413, now seen corresponding path program 3 times [2022-11-25 23:18:24,447 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:18:24,447 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1273628498] [2022-11-25 23:18:24,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:18:24,447 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:18:24,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:18:24,639 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-25 23:18:24,639 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:18:24,639 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1273628498] [2022-11-25 23:18:24,639 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1273628498] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:18:24,640 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1135488399] [2022-11-25 23:18:24,640 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:18:24,641 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:18:24,641 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_263a91de-7b08-47bf-a4ae-41a479322afc/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:18:24,644 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_263a91de-7b08-47bf-a4ae-41a479322afc/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:18:24,653 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_263a91de-7b08-47bf-a4ae-41a479322afc/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-25 23:18:24,734 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:18:24,734 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:18:24,735 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 6 conjunts are in the unsatisfiable core [2022-11-25 23:18:24,737 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:18:24,750 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-25 23:18:24,751 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:18:24,814 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-25 23:18:24,814 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1135488399] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:18:24,814 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [427096100] [2022-11-25 23:18:24,816 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-25 23:18:24,817 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:18:24,817 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:18:24,817 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:18:24,818 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:18:24,852 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:24,856 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:24,858 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:24,931 INFO L321 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2022-11-25 23:18:24,931 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 9 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 55 treesize of output 73 [2022-11-25 23:18:24,952 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:24,953 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:24,955 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:24,956 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 13 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 32 [2022-11-25 23:18:24,995 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:24,996 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 6 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 [2022-11-25 23:18:25,138 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:25,139 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:18:25,168 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-25 23:18:25,168 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 324 treesize of output 323 [2022-11-25 23:18:25,377 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 16 treesize of output 12 [2022-11-25 23:18:25,400 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:18:25,411 INFO L321 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2022-11-25 23:18:25,411 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 34 treesize of output 24 [2022-11-25 23:18:25,421 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:18:25,431 INFO L321 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2022-11-25 23:18:25,431 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 33 treesize of output 23 [2022-11-25 23:18:25,513 INFO L321 Elim1Store]: treesize reduction 94, result has 21.0 percent of original size [2022-11-25 23:18:25,514 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 98 treesize of output 98 [2022-11-25 23:18:25,670 INFO L321 Elim1Store]: treesize reduction 39, result has 35.0 percent of original size [2022-11-25 23:18:25,670 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 55 treesize of output 58 [2022-11-25 23:18:25,684 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 18 treesize of output 12 [2022-11-25 23:18:25,706 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-25 23:18:25,707 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 43 treesize of output 47 [2022-11-25 23:18:25,727 INFO L321 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2022-11-25 23:18:25,727 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 38 treesize of output 25 [2022-11-25 23:18:25,830 INFO L321 Elim1Store]: treesize reduction 94, result has 21.0 percent of original size [2022-11-25 23:18:25,831 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 98 treesize of output 98 [2022-11-25 23:18:25,904 INFO L321 Elim1Store]: treesize reduction 39, result has 35.0 percent of original size [2022-11-25 23:18:25,905 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 85 treesize of output 82 [2022-11-25 23:18:25,917 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 62 treesize of output 38 [2022-11-25 23:18:25,928 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 49 treesize of output 28 [2022-11-25 23:18:25,940 INFO L321 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2022-11-25 23:18:25,940 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 62 treesize of output 31 [2022-11-25 23:18:25,953 INFO L321 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2022-11-25 23:18:25,954 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 62 treesize of output 31 [2022-11-25 23:18:25,980 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 20 for LOIs [2022-11-25 23:18:25,993 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:18:26,263 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '623#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (exists ((|v_ULTIMATE.start_main_~#bb~0#1.base_BEFORE_CALL_3| Int)) (and (<= 0 |v_ULTIMATE.start_main_~#bb~0#1.base_BEFORE_CALL_3|) (= |__VERIFIER_assert_#in~cond| (ite (<= 0 (select (select |#memory_int| |v_ULTIMATE.start_main_~#bb~0#1.base_BEFORE_CALL_3|) 0)) 1 0)))) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:18:26,263 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:18:26,264 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:18:26,264 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 11 [2022-11-25 23:18:26,264 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1479649817] [2022-11-25 23:18:26,264 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:18:26,264 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-11-25 23:18:26,264 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:18:26,265 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-11-25 23:18:26,265 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=256, Unknown=0, NotChecked=0, Total=342 [2022-11-25 23:18:26,266 INFO L87 Difference]: Start difference. First operand 23 states and 27 transitions. Second operand has 12 states, 12 states have (on average 1.5) internal successors, (18), 11 states have internal predecessors, (18), 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) [2022-11-25 23:18:26,313 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:18:26,314 INFO L93 Difference]: Finished difference Result 46 states and 59 transitions. [2022-11-25 23:18:26,314 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-25 23:18:26,314 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.5) internal successors, (18), 11 states have internal predecessors, (18), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2022-11-25 23:18:26,315 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:18:26,315 INFO L225 Difference]: With dead ends: 46 [2022-11-25 23:18:26,315 INFO L226 Difference]: Without dead ends: 29 [2022-11-25 23:18:26,316 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=86, Invalid=256, Unknown=0, NotChecked=0, Total=342 [2022-11-25 23:18:26,317 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 0 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 66 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-25 23:18:26,317 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 66 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-25 23:18:26,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2022-11-25 23:18:26,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2022-11-25 23:18:26,322 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 25 states have (on average 1.16) internal successors, (29), 25 states have internal predecessors, (29), 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) [2022-11-25 23:18:26,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2022-11-25 23:18:26,323 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 16 [2022-11-25 23:18:26,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:18:26,323 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2022-11-25 23:18:26,324 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 1.5) internal successors, (18), 11 states have internal predecessors, (18), 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) [2022-11-25 23:18:26,324 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2022-11-25 23:18:26,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-11-25 23:18:26,324 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:18:26,325 INFO L195 NwaCegarLoop]: trace histogram [10, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:18:26,335 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_263a91de-7b08-47bf-a4ae-41a479322afc/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-25 23:18:26,530 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_263a91de-7b08-47bf-a4ae-41a479322afc/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:18:26,531 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:18:26,531 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:18:26,531 INFO L85 PathProgramCache]: Analyzing trace with hash -1851338581, now seen corresponding path program 4 times [2022-11-25 23:18:26,531 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:18:26,532 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1351980883] [2022-11-25 23:18:26,532 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:18:26,532 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:18:26,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:18:26,847 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-25 23:18:26,847 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:18:26,847 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1351980883] [2022-11-25 23:18:26,847 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1351980883] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:18:26,848 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [853122988] [2022-11-25 23:18:26,848 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 23:18:26,848 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:18:26,848 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_263a91de-7b08-47bf-a4ae-41a479322afc/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:18:26,849 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_263a91de-7b08-47bf-a4ae-41a479322afc/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:18:26,867 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_263a91de-7b08-47bf-a4ae-41a479322afc/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-25 23:18:26,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:18:26,955 INFO L263 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-25 23:18:26,958 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:18:26,982 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-25 23:18:26,982 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:18:27,207 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-25 23:18:27,207 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [853122988] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:18:27,208 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [617072687] [2022-11-25 23:18:27,210 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-25 23:18:27,210 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:18:27,210 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:18:27,210 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:18:27,210 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:18:27,233 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:27,236 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:27,239 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:27,311 INFO L321 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2022-11-25 23:18:27,312 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 9 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 55 treesize of output 73 [2022-11-25 23:18:27,329 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:27,330 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:27,332 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:27,333 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 13 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 32 [2022-11-25 23:18:27,369 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:27,370 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 6 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 [2022-11-25 23:18:27,465 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:27,466 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:18:27,493 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-25 23:18:27,493 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 324 treesize of output 323 [2022-11-25 23:18:27,662 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 16 treesize of output 12 [2022-11-25 23:18:27,680 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:18:27,690 INFO L321 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2022-11-25 23:18:27,690 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 33 treesize of output 23 [2022-11-25 23:18:27,698 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:18:27,708 INFO L321 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2022-11-25 23:18:27,709 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 34 treesize of output 24 [2022-11-25 23:18:27,782 INFO L321 Elim1Store]: treesize reduction 94, result has 21.0 percent of original size [2022-11-25 23:18:27,783 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 98 treesize of output 98 [2022-11-25 23:18:27,893 INFO L321 Elim1Store]: treesize reduction 39, result has 35.0 percent of original size [2022-11-25 23:18:27,894 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 89 treesize of output 86 [2022-11-25 23:18:27,906 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 16 treesize of output 10 [2022-11-25 23:18:27,920 INFO L321 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2022-11-25 23:18:27,920 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 66 treesize of output 32 [2022-11-25 23:18:27,937 INFO L321 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2022-11-25 23:18:27,938 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 71 treesize of output 37 [2022-11-25 23:18:28,013 INFO L321 Elim1Store]: treesize reduction 39, result has 35.0 percent of original size [2022-11-25 23:18:28,013 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 80 treesize of output 77 [2022-11-25 23:18:28,025 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 12 treesize of output 10 [2022-11-25 23:18:28,048 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:18:28,048 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 57 treesize of output 24 [2022-11-25 23:18:28,058 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:18:28,059 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 62 treesize of output 24 [2022-11-25 23:18:28,139 INFO L321 Elim1Store]: treesize reduction 94, result has 21.0 percent of original size [2022-11-25 23:18:28,140 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 98 treesize of output 98 [2022-11-25 23:18:28,217 INFO L321 Elim1Store]: treesize reduction 39, result has 35.0 percent of original size [2022-11-25 23:18:28,218 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 55 treesize of output 58 [2022-11-25 23:18:28,228 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 18 treesize of output 12 [2022-11-25 23:18:28,240 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:28,241 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 25 [2022-11-25 23:18:28,260 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 20 for LOIs [2022-11-25 23:18:28,272 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:18:28,561 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '907#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (exists ((|v_ULTIMATE.start_main_~#bb~0#1.base_BEFORE_CALL_4| Int)) (and (= |__VERIFIER_assert_#in~cond| (ite (<= 0 (select (select |#memory_int| |v_ULTIMATE.start_main_~#bb~0#1.base_BEFORE_CALL_4|) 0)) 1 0)) (<= 0 |v_ULTIMATE.start_main_~#bb~0#1.base_BEFORE_CALL_4|))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:18:28,561 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:18:28,561 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:18:28,561 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 23 [2022-11-25 23:18:28,561 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [294181056] [2022-11-25 23:18:28,561 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:18:28,562 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-11-25 23:18:28,562 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:18:28,562 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-11-25 23:18:28,563 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=296, Invalid=634, Unknown=0, NotChecked=0, Total=930 [2022-11-25 23:18:28,563 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand has 24 states, 24 states have (on average 1.25) internal successors, (30), 23 states have internal predecessors, (30), 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) [2022-11-25 23:18:28,633 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:18:28,633 INFO L93 Difference]: Finished difference Result 58 states and 77 transitions. [2022-11-25 23:18:28,634 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-11-25 23:18:28,634 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.25) internal successors, (30), 23 states have internal predecessors, (30), 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 22 [2022-11-25 23:18:28,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:18:28,635 INFO L225 Difference]: With dead ends: 58 [2022-11-25 23:18:28,636 INFO L226 Difference]: Without dead ends: 41 [2022-11-25 23:18:28,636 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 221 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=296, Invalid=634, Unknown=0, NotChecked=0, Total=930 [2022-11-25 23:18:28,637 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 0 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 54 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:18:28,638 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 55 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 54 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:18:28,639 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2022-11-25 23:18:28,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2022-11-25 23:18:28,653 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 37 states have (on average 1.1081081081081081) internal successors, (41), 37 states have internal predecessors, (41), 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) [2022-11-25 23:18:28,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2022-11-25 23:18:28,656 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 22 [2022-11-25 23:18:28,656 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:18:28,656 INFO L495 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2022-11-25 23:18:28,656 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 1.25) internal successors, (30), 23 states have internal predecessors, (30), 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) [2022-11-25 23:18:28,657 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2022-11-25 23:18:28,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-11-25 23:18:28,658 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:18:28,658 INFO L195 NwaCegarLoop]: trace histogram [22, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:18:28,668 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_263a91de-7b08-47bf-a4ae-41a479322afc/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-25 23:18:28,864 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_263a91de-7b08-47bf-a4ae-41a479322afc/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:18:28,864 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:18:28,864 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:18:28,864 INFO L85 PathProgramCache]: Analyzing trace with hash -1882744149, now seen corresponding path program 5 times [2022-11-25 23:18:28,864 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:18:28,865 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [12188696] [2022-11-25 23:18:28,865 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:18:28,865 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:18:28,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:18:29,590 INFO L134 CoverageAnalysis]: Checked inductivity of 263 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-25 23:18:29,590 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:18:29,590 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [12188696] [2022-11-25 23:18:29,590 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [12188696] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:18:29,590 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1687196020] [2022-11-25 23:18:29,591 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:18:29,591 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:18:29,591 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_263a91de-7b08-47bf-a4ae-41a479322afc/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:18:29,607 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_263a91de-7b08-47bf-a4ae-41a479322afc/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:18:29,647 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_263a91de-7b08-47bf-a4ae-41a479322afc/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-25 23:18:29,786 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-25 23:18:29,786 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:18:29,788 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 6 conjunts are in the unsatisfiable core [2022-11-25 23:18:29,792 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:18:29,924 INFO L134 CoverageAnalysis]: Checked inductivity of 263 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-11-25 23:18:29,925 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:18:30,090 INFO L134 CoverageAnalysis]: Checked inductivity of 263 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-11-25 23:18:30,091 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1687196020] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:18:30,091 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1561504539] [2022-11-25 23:18:30,093 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-25 23:18:30,093 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:18:30,093 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:18:30,093 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:18:30,094 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:18:30,117 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:30,120 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:30,122 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:30,190 INFO L321 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2022-11-25 23:18:30,190 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 9 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 55 treesize of output 73 [2022-11-25 23:18:30,207 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:30,208 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:30,210 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:30,211 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 13 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 32 [2022-11-25 23:18:30,243 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:30,244 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 6 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-25 23:18:30,356 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:30,358 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:30,373 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-25 23:18:30,373 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 334 treesize of output 322 [2022-11-25 23:18:30,449 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 16 treesize of output 12 [2022-11-25 23:18:30,471 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:18:30,481 INFO L321 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2022-11-25 23:18:30,482 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 34 treesize of output 24 [2022-11-25 23:18:30,490 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:18:30,501 INFO L321 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2022-11-25 23:18:30,501 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 33 treesize of output 23 [2022-11-25 23:18:30,591 INFO L321 Elim1Store]: treesize reduction 94, result has 21.0 percent of original size [2022-11-25 23:18:30,591 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 98 treesize of output 98 [2022-11-25 23:18:30,709 INFO L321 Elim1Store]: treesize reduction 39, result has 35.0 percent of original size [2022-11-25 23:18:30,710 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 55 treesize of output 58 [2022-11-25 23:18:30,720 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 18 treesize of output 12 [2022-11-25 23:18:30,737 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-25 23:18:30,738 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 43 treesize of output 47 [2022-11-25 23:18:30,755 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:30,756 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 25 [2022-11-25 23:18:30,802 INFO L321 Elim1Store]: treesize reduction 39, result has 35.0 percent of original size [2022-11-25 23:18:30,803 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 41 treesize of output 44 [2022-11-25 23:18:30,814 WARN L207 Elim1Store]: Array PQE input equivalent to false [2022-11-25 23:18:30,823 WARN L207 Elim1Store]: Array PQE input equivalent to false [2022-11-25 23:18:30,839 WARN L207 Elim1Store]: Array PQE input equivalent to false [2022-11-25 23:18:30,925 INFO L321 Elim1Store]: treesize reduction 94, result has 21.0 percent of original size [2022-11-25 23:18:30,925 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 98 treesize of output 98 [2022-11-25 23:18:30,995 INFO L321 Elim1Store]: treesize reduction 39, result has 35.0 percent of original size [2022-11-25 23:18:30,995 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 88 treesize of output 85 [2022-11-25 23:18:31,006 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 16 treesize of output 10 [2022-11-25 23:18:31,023 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-25 23:18:31,023 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 70 treesize of output 53 [2022-11-25 23:18:31,047 INFO L321 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2022-11-25 23:18:31,048 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 65 treesize of output 31 [2022-11-25 23:18:31,068 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 20 for LOIs [2022-11-25 23:18:31,083 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:18:31,436 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1322#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (exists ((|v_ULTIMATE.start_main_~#bb~0#1.base_BEFORE_CALL_5| Int)) (and (<= 0 |v_ULTIMATE.start_main_~#bb~0#1.base_BEFORE_CALL_5|) (= (ite (<= 0 (select (select |#memory_int| |v_ULTIMATE.start_main_~#bb~0#1.base_BEFORE_CALL_5|) 0)) 1 0) |__VERIFIER_assert_#in~cond|))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:18:31,436 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:18:31,436 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:18:31,436 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 6, 6] total 34 [2022-11-25 23:18:31,437 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [315072339] [2022-11-25 23:18:31,437 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:18:31,437 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-11-25 23:18:31,437 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:18:31,438 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-11-25 23:18:31,439 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=395, Invalid=1327, Unknown=0, NotChecked=0, Total=1722 [2022-11-25 23:18:31,439 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand has 35 states, 35 states have (on average 1.3142857142857143) internal successors, (46), 34 states have internal predecessors, (46), 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) [2022-11-25 23:18:32,011 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:18:32,011 INFO L93 Difference]: Finished difference Result 65 states and 79 transitions. [2022-11-25 23:18:32,011 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-11-25 23:18:32,012 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.3142857142857143) internal successors, (46), 34 states have internal predecessors, (46), 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 34 [2022-11-25 23:18:32,012 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:18:32,012 INFO L225 Difference]: With dead ends: 65 [2022-11-25 23:18:32,012 INFO L226 Difference]: Without dead ends: 48 [2022-11-25 23:18:32,014 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 84 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 801 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1200, Invalid=2960, Unknown=0, NotChecked=0, Total=4160 [2022-11-25 23:18:32,015 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 0 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 63 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 64 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 63 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:18:32,016 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 55 Invalid, 64 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 63 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:18:32,016 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2022-11-25 23:18:32,020 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2022-11-25 23:18:32,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 44 states have (on average 1.0909090909090908) internal successors, (48), 44 states have internal predecessors, (48), 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) [2022-11-25 23:18:32,021 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 52 transitions. [2022-11-25 23:18:32,022 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 52 transitions. Word has length 34 [2022-11-25 23:18:32,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:18:32,022 INFO L495 AbstractCegarLoop]: Abstraction has 48 states and 52 transitions. [2022-11-25 23:18:32,022 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.3142857142857143) internal successors, (46), 34 states have internal predecessors, (46), 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) [2022-11-25 23:18:32,022 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 52 transitions. [2022-11-25 23:18:32,023 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-11-25 23:18:32,023 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:18:32,023 INFO L195 NwaCegarLoop]: trace histogram [23, 10, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:18:32,034 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_263a91de-7b08-47bf-a4ae-41a479322afc/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-25 23:18:32,224 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_263a91de-7b08-47bf-a4ae-41a479322afc/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:18:32,224 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:18:32,224 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:18:32,225 INFO L85 PathProgramCache]: Analyzing trace with hash 632384003, now seen corresponding path program 6 times [2022-11-25 23:18:32,225 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:18:32,225 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [286567347] [2022-11-25 23:18:32,225 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:18:32,225 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:18:32,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:18:33,077 INFO L134 CoverageAnalysis]: Checked inductivity of 331 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-11-25 23:18:33,077 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:18:33,077 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [286567347] [2022-11-25 23:18:33,077 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [286567347] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:18:33,078 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [392013604] [2022-11-25 23:18:33,078 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:18:33,078 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:18:33,078 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_263a91de-7b08-47bf-a4ae-41a479322afc/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:18:33,079 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_263a91de-7b08-47bf-a4ae-41a479322afc/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:18:33,103 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_263a91de-7b08-47bf-a4ae-41a479322afc/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-25 23:18:33,241 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:18:33,241 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:18:33,244 INFO L263 TraceCheckSpWp]: Trace formula consists of 390 conjuncts, 25 conjunts are in the unsatisfiable core [2022-11-25 23:18:33,251 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:18:33,302 INFO L134 CoverageAnalysis]: Checked inductivity of 331 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-11-25 23:18:33,303 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:18:34,146 INFO L134 CoverageAnalysis]: Checked inductivity of 331 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-11-25 23:18:34,147 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [392013604] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:18:34,147 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [741818750] [2022-11-25 23:18:34,149 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-25 23:18:34,149 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:18:34,150 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:18:34,150 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:18:34,150 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:18:34,171 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:34,177 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:34,179 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:34,238 INFO L321 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2022-11-25 23:18:34,239 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 9 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 55 treesize of output 73 [2022-11-25 23:18:34,259 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:34,260 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:34,261 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:34,262 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 13 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 32 [2022-11-25 23:18:34,290 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:34,291 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 6 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-25 23:18:34,379 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:34,381 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:34,395 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-25 23:18:34,396 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 334 treesize of output 322 [2022-11-25 23:18:34,485 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 16 treesize of output 12 [2022-11-25 23:18:34,511 INFO L321 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-11-25 23:18:34,511 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 23 treesize of output 18 [2022-11-25 23:18:34,528 INFO L321 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-11-25 23:18:34,528 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 24 treesize of output 19 [2022-11-25 23:18:34,620 INFO L321 Elim1Store]: treesize reduction 94, result has 21.0 percent of original size [2022-11-25 23:18:34,620 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 98 treesize of output 98 [2022-11-25 23:18:34,736 INFO L321 Elim1Store]: treesize reduction 39, result has 35.0 percent of original size [2022-11-25 23:18:34,737 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 89 treesize of output 86 [2022-11-25 23:18:34,748 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 16 treesize of output 10 [2022-11-25 23:18:34,775 INFO L321 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2022-11-25 23:18:34,775 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 66 treesize of output 32 [2022-11-25 23:18:34,790 INFO L321 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2022-11-25 23:18:34,791 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 71 treesize of output 37 [2022-11-25 23:18:34,865 INFO L321 Elim1Store]: treesize reduction 39, result has 35.0 percent of original size [2022-11-25 23:18:34,865 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 80 treesize of output 77 [2022-11-25 23:18:34,876 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 12 treesize of output 10 [2022-11-25 23:18:34,890 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:18:34,891 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 57 treesize of output 24 [2022-11-25 23:18:34,901 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:18:34,901 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 62 treesize of output 24 [2022-11-25 23:18:34,974 INFO L321 Elim1Store]: treesize reduction 94, result has 21.0 percent of original size [2022-11-25 23:18:34,975 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 98 treesize of output 98 [2022-11-25 23:18:35,032 INFO L321 Elim1Store]: treesize reduction 39, result has 35.0 percent of original size [2022-11-25 23:18:35,033 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 55 treesize of output 58 [2022-11-25 23:18:35,045 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 18 treesize of output 12 [2022-11-25 23:18:35,062 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-25 23:18:35,063 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 43 treesize of output 47 [2022-11-25 23:18:35,074 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:35,075 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 25 [2022-11-25 23:18:35,099 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 20 for LOIs [2022-11-25 23:18:35,109 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:18:35,452 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1868#(and (exists ((|v_ULTIMATE.start_main_~#bb~0#1.base_BEFORE_CALL_6| Int)) (and (<= 0 |v_ULTIMATE.start_main_~#bb~0#1.base_BEFORE_CALL_6|) (= (ite (<= 0 (select (select |#memory_int| |v_ULTIMATE.start_main_~#bb~0#1.base_BEFORE_CALL_6|) 0)) 1 0) |__VERIFIER_assert_#in~cond|))) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:18:35,452 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:18:35,452 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:18:35,452 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 49 [2022-11-25 23:18:35,453 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1014650943] [2022-11-25 23:18:35,453 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:18:35,453 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2022-11-25 23:18:35,453 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:18:35,454 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2022-11-25 23:18:35,456 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1245, Invalid=1947, Unknown=0, NotChecked=0, Total=3192 [2022-11-25 23:18:35,457 INFO L87 Difference]: Start difference. First operand 48 states and 52 transitions. Second operand has 50 states, 50 states have (on average 1.12) internal successors, (56), 49 states have internal predecessors, (56), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:18:35,557 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:18:35,558 INFO L93 Difference]: Finished difference Result 96 states and 128 transitions. [2022-11-25 23:18:35,558 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2022-11-25 23:18:35,558 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 1.12) internal successors, (56), 49 states have internal predecessors, (56), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 41 [2022-11-25 23:18:35,558 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:18:35,559 INFO L225 Difference]: With dead ends: 96 [2022-11-25 23:18:35,559 INFO L226 Difference]: Without dead ends: 73 [2022-11-25 23:18:35,561 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 91 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 494 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1245, Invalid=1947, Unknown=0, NotChecked=0, Total=3192 [2022-11-25 23:18:35,561 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 0 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 86 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 66 SdHoareTripleChecker+Invalid, 87 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 86 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:18:35,561 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 66 Invalid, 87 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 86 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:18:35,562 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2022-11-25 23:18:35,569 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 73. [2022-11-25 23:18:35,569 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 69 states have (on average 1.0579710144927537) internal successors, (73), 69 states have internal predecessors, (73), 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) [2022-11-25 23:18:35,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 77 transitions. [2022-11-25 23:18:35,570 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 77 transitions. Word has length 41 [2022-11-25 23:18:35,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:18:35,570 INFO L495 AbstractCegarLoop]: Abstraction has 73 states and 77 transitions. [2022-11-25 23:18:35,571 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 1.12) internal successors, (56), 49 states have internal predecessors, (56), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:18:35,571 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 77 transitions. [2022-11-25 23:18:35,572 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2022-11-25 23:18:35,572 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:18:35,572 INFO L195 NwaCegarLoop]: trace histogram [48, 10, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:18:35,583 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_263a91de-7b08-47bf-a4ae-41a479322afc/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-25 23:18:35,778 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_263a91de-7b08-47bf-a4ae-41a479322afc/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:18:35,779 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:18:35,779 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:18:35,779 INFO L85 PathProgramCache]: Analyzing trace with hash -1922554805, now seen corresponding path program 7 times [2022-11-25 23:18:35,779 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:18:35,780 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1935558769] [2022-11-25 23:18:35,780 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:18:35,780 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:18:35,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:18:38,044 INFO L134 CoverageAnalysis]: Checked inductivity of 1231 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-11-25 23:18:38,044 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:18:38,044 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1935558769] [2022-11-25 23:18:38,044 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1935558769] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:18:38,044 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [686859603] [2022-11-25 23:18:38,044 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 23:18:38,044 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:18:38,044 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_263a91de-7b08-47bf-a4ae-41a479322afc/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:18:38,046 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_263a91de-7b08-47bf-a4ae-41a479322afc/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:18:38,049 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_263a91de-7b08-47bf-a4ae-41a479322afc/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-25 23:18:38,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:18:38,284 INFO L263 TraceCheckSpWp]: Trace formula consists of 615 conjuncts, 50 conjunts are in the unsatisfiable core [2022-11-25 23:18:38,287 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:18:38,391 INFO L134 CoverageAnalysis]: Checked inductivity of 1231 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-11-25 23:18:38,391 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:18:41,637 INFO L134 CoverageAnalysis]: Checked inductivity of 1231 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-11-25 23:18:41,638 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [686859603] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:18:41,638 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1975934534] [2022-11-25 23:18:41,640 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-25 23:18:41,640 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:18:41,640 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:18:41,641 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:18:41,641 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:18:41,668 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:41,671 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:41,673 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:41,747 INFO L321 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2022-11-25 23:18:41,747 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 9 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 55 treesize of output 73 [2022-11-25 23:18:41,765 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:41,766 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:41,767 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:41,768 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 13 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 32 [2022-11-25 23:18:41,801 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:41,802 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 6 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 [2022-11-25 23:18:41,913 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:41,914 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:18:41,947 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-25 23:18:41,948 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 324 treesize of output 323 [2022-11-25 23:18:42,108 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 16 treesize of output 12 [2022-11-25 23:18:42,135 INFO L321 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-11-25 23:18:42,135 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 23 treesize of output 18 [2022-11-25 23:18:42,152 INFO L321 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-11-25 23:18:42,152 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 24 treesize of output 19 [2022-11-25 23:18:42,225 INFO L321 Elim1Store]: treesize reduction 94, result has 21.0 percent of original size [2022-11-25 23:18:42,225 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 98 treesize of output 98 [2022-11-25 23:18:42,339 INFO L321 Elim1Store]: treesize reduction 39, result has 35.0 percent of original size [2022-11-25 23:18:42,340 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 88 treesize of output 85 [2022-11-25 23:18:42,366 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 16 treesize of output 10 [2022-11-25 23:18:42,386 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-25 23:18:42,386 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 70 treesize of output 53 [2022-11-25 23:18:42,411 INFO L321 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2022-11-25 23:18:42,412 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 65 treesize of output 31 [2022-11-25 23:18:42,507 INFO L321 Elim1Store]: treesize reduction 94, result has 21.0 percent of original size [2022-11-25 23:18:42,508 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 98 treesize of output 98 [2022-11-25 23:18:42,606 INFO L321 Elim1Store]: treesize reduction 39, result has 35.0 percent of original size [2022-11-25 23:18:42,607 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 89 treesize of output 86 [2022-11-25 23:18:42,616 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 16 treesize of output 10 [2022-11-25 23:18:42,630 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-25 23:18:42,631 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 71 treesize of output 54 [2022-11-25 23:18:42,647 INFO L321 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2022-11-25 23:18:42,647 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 66 treesize of output 32 [2022-11-25 23:18:42,676 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 20 for LOIs [2022-11-25 23:18:42,687 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:18:43,164 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2680#(and (exists ((|v_ULTIMATE.start_main_~#bb~0#1.base_BEFORE_CALL_7| Int)) (and (<= 0 |v_ULTIMATE.start_main_~#bb~0#1.base_BEFORE_CALL_7|) (= |__VERIFIER_assert_#in~cond| (ite (<= 0 (select (select |#memory_int| |v_ULTIMATE.start_main_~#bb~0#1.base_BEFORE_CALL_7|) 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 [2022-11-25 23:18:43,164 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:18:43,164 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:18:43,164 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 99 [2022-11-25 23:18:43,164 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1468937687] [2022-11-25 23:18:43,165 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:18:43,165 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 100 states [2022-11-25 23:18:43,165 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:18:43,168 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 100 interpolants. [2022-11-25 23:18:43,172 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4970, Invalid=6372, Unknown=0, NotChecked=0, Total=11342 [2022-11-25 23:18:43,172 INFO L87 Difference]: Start difference. First operand 73 states and 77 transitions. Second operand has 100 states, 100 states have (on average 1.06) internal successors, (106), 99 states have internal predecessors, (106), 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) [2022-11-25 23:18:43,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:18:43,371 INFO L93 Difference]: Finished difference Result 146 states and 203 transitions. [2022-11-25 23:18:43,371 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2022-11-25 23:18:43,372 INFO L78 Accepts]: Start accepts. Automaton has has 100 states, 100 states have (on average 1.06) internal successors, (106), 99 states have internal predecessors, (106), 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 66 [2022-11-25 23:18:43,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:18:43,375 INFO L225 Difference]: With dead ends: 146 [2022-11-25 23:18:43,375 INFO L226 Difference]: Without dead ends: 123 [2022-11-25 23:18:43,378 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 246 GetRequests, 141 SyntacticMatches, 0 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1019 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=4970, Invalid=6372, Unknown=0, NotChecked=0, Total=11342 [2022-11-25 23:18:43,380 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 0 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 130 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 131 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 130 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:18:43,381 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 55 Invalid, 131 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 130 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:18:43,381 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2022-11-25 23:18:43,403 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 123. [2022-11-25 23:18:43,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 119 states have (on average 1.0336134453781514) internal successors, (123), 119 states have internal predecessors, (123), 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) [2022-11-25 23:18:43,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 127 transitions. [2022-11-25 23:18:43,409 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 127 transitions. Word has length 66 [2022-11-25 23:18:43,409 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:18:43,410 INFO L495 AbstractCegarLoop]: Abstraction has 123 states and 127 transitions. [2022-11-25 23:18:43,410 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 100 states, 100 states have (on average 1.06) internal successors, (106), 99 states have internal predecessors, (106), 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) [2022-11-25 23:18:43,410 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 127 transitions. [2022-11-25 23:18:43,418 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2022-11-25 23:18:43,420 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:18:43,420 INFO L195 NwaCegarLoop]: trace histogram [98, 10, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:18:43,431 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_263a91de-7b08-47bf-a4ae-41a479322afc/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2022-11-25 23:18:43,626 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_263a91de-7b08-47bf-a4ae-41a479322afc/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2022-11-25 23:18:43,626 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:18:43,627 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:18:43,627 INFO L85 PathProgramCache]: Analyzing trace with hash 1793762123, now seen corresponding path program 8 times [2022-11-25 23:18:43,627 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:18:43,627 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [155376265] [2022-11-25 23:18:43,627 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:18:43,627 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:18:43,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:18:50,807 INFO L134 CoverageAnalysis]: Checked inductivity of 4906 backedges. 0 proven. 4851 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-11-25 23:18:50,807 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:18:50,808 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [155376265] [2022-11-25 23:18:50,808 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [155376265] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:18:50,808 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2083867075] [2022-11-25 23:18:50,808 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:18:50,808 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:18:50,809 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_263a91de-7b08-47bf-a4ae-41a479322afc/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:18:50,810 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_263a91de-7b08-47bf-a4ae-41a479322afc/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:18:50,827 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_263a91de-7b08-47bf-a4ae-41a479322afc/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-25 23:18:52,910 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-11-25 23:18:52,910 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:18:52,915 INFO L263 TraceCheckSpWp]: Trace formula consists of 273 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-25 23:18:52,919 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:18:53,598 INFO L134 CoverageAnalysis]: Checked inductivity of 4906 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 4851 trivial. 0 not checked. [2022-11-25 23:18:53,598 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:18:54,391 INFO L134 CoverageAnalysis]: Checked inductivity of 4906 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 4851 trivial. 0 not checked. [2022-11-25 23:18:54,391 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2083867075] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:18:54,391 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2033615649] [2022-11-25 23:18:54,393 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-25 23:18:54,394 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:18:54,394 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:18:54,394 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:18:54,395 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:18:54,416 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:54,417 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:54,418 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:54,468 INFO L321 Elim1Store]: treesize reduction 83, result has 23.9 percent of original size [2022-11-25 23:18:54,469 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 23 treesize of output 42 [2022-11-25 23:18:54,490 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:54,493 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:54,495 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:54,560 INFO L321 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2022-11-25 23:18:54,560 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 9 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 55 treesize of output 73 [2022-11-25 23:18:54,588 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:54,589 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 6 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 [2022-11-25 23:18:54,674 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:54,675 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:18:54,702 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-25 23:18:54,703 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 324 treesize of output 323 [2022-11-25 23:18:54,846 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 16 treesize of output 12 [2022-11-25 23:18:54,870 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:18:54,880 INFO L321 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2022-11-25 23:18:54,881 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 34 treesize of output 24 [2022-11-25 23:18:54,890 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:18:54,900 INFO L321 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2022-11-25 23:18:54,901 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 33 treesize of output 23 [2022-11-25 23:18:54,972 INFO L321 Elim1Store]: treesize reduction 94, result has 21.0 percent of original size [2022-11-25 23:18:54,973 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 98 treesize of output 98 [2022-11-25 23:18:55,086 INFO L321 Elim1Store]: treesize reduction 39, result has 35.0 percent of original size [2022-11-25 23:18:55,086 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 86 treesize of output 83 [2022-11-25 23:18:55,097 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 63 treesize of output 39 [2022-11-25 23:18:55,118 INFO L321 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2022-11-25 23:18:55,119 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 63 treesize of output 32 [2022-11-25 23:18:55,128 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 50 treesize of output 29 [2022-11-25 23:18:55,143 INFO L321 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2022-11-25 23:18:55,143 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 63 treesize of output 32 [2022-11-25 23:18:55,237 INFO L321 Elim1Store]: treesize reduction 94, result has 21.0 percent of original size [2022-11-25 23:18:55,238 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 98 treesize of output 98 [2022-11-25 23:18:55,296 INFO L321 Elim1Store]: treesize reduction 39, result has 35.0 percent of original size [2022-11-25 23:18:55,297 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 55 treesize of output 58 [2022-11-25 23:18:55,306 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 18 treesize of output 12 [2022-11-25 23:18:55,316 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:55,317 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 43 treesize of output 30 [2022-11-25 23:18:55,325 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:18:55,325 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 25 [2022-11-25 23:18:55,348 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 20 for LOIs [2022-11-25 23:18:55,359 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:18:56,145 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4015#(and (exists ((|v_ULTIMATE.start_main_~#bb~0#1.base_BEFORE_CALL_8| Int)) (and (= (ite (<= 0 (select (select |#memory_int| |v_ULTIMATE.start_main_~#bb~0#1.base_BEFORE_CALL_8|) 0)) 1 0) |__VERIFIER_assert_#in~cond|) (<= 0 |v_ULTIMATE.start_main_~#bb~0#1.base_BEFORE_CALL_8|))) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:18:56,147 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:18:56,147 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:18:56,148 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [100, 12, 12] total 122 [2022-11-25 23:18:56,148 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [127657377] [2022-11-25 23:18:56,148 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:18:56,151 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 123 states [2022-11-25 23:18:56,151 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:18:56,155 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 123 interpolants. [2022-11-25 23:18:56,159 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5367, Invalid=11403, Unknown=0, NotChecked=0, Total=16770 [2022-11-25 23:18:56,160 INFO L87 Difference]: Start difference. First operand 123 states and 127 transitions. Second operand has 123 states, 123 states have (on average 1.089430894308943) internal successors, (134), 122 states have internal predecessors, (134), 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) [2022-11-25 23:19:01,406 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:19:01,406 INFO L93 Difference]: Finished difference Result 159 states and 179 transitions. [2022-11-25 23:19:01,406 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 123 states. [2022-11-25 23:19:01,407 INFO L78 Accepts]: Start accepts. Automaton has has 123 states, 123 states have (on average 1.089430894308943) internal successors, (134), 122 states have internal predecessors, (134), 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 116 [2022-11-25 23:19:01,407 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:19:01,408 INFO L225 Difference]: With dead ends: 159 [2022-11-25 23:19:01,408 INFO L226 Difference]: Without dead ends: 136 [2022-11-25 23:19:01,414 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 545 GetRequests, 318 SyntacticMatches, 0 SemanticMatches, 227 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8227 ImplicationChecksByTransitivity, 10.6s TimeCoverageRelationStatistics Valid=17544, Invalid=34668, Unknown=0, NotChecked=0, Total=52212 [2022-11-25 23:19:01,415 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 0 mSDsluCounter, 132 mSDsCounter, 0 mSdLazyCounter, 187 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 143 SdHoareTripleChecker+Invalid, 188 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 187 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-25 23:19:01,415 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 143 Invalid, 188 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 187 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-25 23:19:01,416 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2022-11-25 23:19:01,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 136. [2022-11-25 23:19:01,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 132 states have (on average 1.0303030303030303) internal successors, (136), 132 states have internal predecessors, (136), 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) [2022-11-25 23:19:01,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 140 transitions. [2022-11-25 23:19:01,428 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 140 transitions. Word has length 116 [2022-11-25 23:19:01,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:19:01,429 INFO L495 AbstractCegarLoop]: Abstraction has 136 states and 140 transitions. [2022-11-25 23:19:01,429 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 123 states, 123 states have (on average 1.089430894308943) internal successors, (134), 122 states have internal predecessors, (134), 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) [2022-11-25 23:19:01,429 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 140 transitions. [2022-11-25 23:19:01,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2022-11-25 23:19:01,431 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:19:01,431 INFO L195 NwaCegarLoop]: trace histogram [99, 22, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:19:01,439 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_263a91de-7b08-47bf-a4ae-41a479322afc/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-25 23:19:01,635 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_263a91de-7b08-47bf-a4ae-41a479322afc/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-25 23:19:01,635 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:19:01,636 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:19:01,636 INFO L85 PathProgramCache]: Analyzing trace with hash -259358397, now seen corresponding path program 9 times [2022-11-25 23:19:01,636 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:19:01,636 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1255526578] [2022-11-25 23:19:01,636 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:19:01,636 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:19:01,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:19:09,146 INFO L134 CoverageAnalysis]: Checked inductivity of 5203 backedges. 0 proven. 4950 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-11-25 23:19:09,146 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:19:09,146 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1255526578] [2022-11-25 23:19:09,146 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1255526578] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:19:09,146 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [12208958] [2022-11-25 23:19:09,146 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:19:09,147 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:19:09,147 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_263a91de-7b08-47bf-a4ae-41a479322afc/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:19:09,147 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_263a91de-7b08-47bf-a4ae-41a479322afc/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:19:09,151 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_263a91de-7b08-47bf-a4ae-41a479322afc/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-25 23:19:09,564 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:19:09,564 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:19:09,570 INFO L263 TraceCheckSpWp]: Trace formula consists of 1194 conjuncts, 101 conjunts are in the unsatisfiable core [2022-11-25 23:19:09,575 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:19:09,787 INFO L134 CoverageAnalysis]: Checked inductivity of 5203 backedges. 0 proven. 4950 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-11-25 23:19:09,787 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:19:21,771 INFO L134 CoverageAnalysis]: Checked inductivity of 5203 backedges. 0 proven. 4950 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-11-25 23:19:21,772 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [12208958] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:19:21,772 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1857442844] [2022-11-25 23:19:21,773 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-25 23:19:21,773 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:19:21,774 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:19:21,774 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:19:21,774 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:19:21,795 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:21,796 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:21,797 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:21,857 INFO L321 Elim1Store]: treesize reduction 83, result has 23.9 percent of original size [2022-11-25 23:19:21,857 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 23 treesize of output 42 [2022-11-25 23:19:21,877 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:21,880 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:21,882 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:21,947 INFO L321 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2022-11-25 23:19:21,947 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 9 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 55 treesize of output 73 [2022-11-25 23:19:21,979 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:21,980 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 6 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 [2022-11-25 23:19:22,067 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:22,068 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:19:22,092 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-25 23:19:22,092 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 324 treesize of output 323 [2022-11-25 23:19:22,227 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 16 treesize of output 12 [2022-11-25 23:19:22,254 INFO L321 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-11-25 23:19:22,254 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 24 treesize of output 19 [2022-11-25 23:19:22,271 INFO L321 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-11-25 23:19:22,271 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 23 treesize of output 18 [2022-11-25 23:19:22,333 INFO L321 Elim1Store]: treesize reduction 94, result has 21.0 percent of original size [2022-11-25 23:19:22,333 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 98 treesize of output 98 [2022-11-25 23:19:22,447 INFO L321 Elim1Store]: treesize reduction 39, result has 35.0 percent of original size [2022-11-25 23:19:22,447 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 51 treesize of output 54 [2022-11-25 23:19:22,457 WARN L207 Elim1Store]: Array PQE input equivalent to false [2022-11-25 23:19:22,465 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:19:22,467 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 12 [2022-11-25 23:19:22,478 WARN L207 Elim1Store]: Array PQE input equivalent to false [2022-11-25 23:19:22,541 INFO L321 Elim1Store]: treesize reduction 39, result has 35.0 percent of original size [2022-11-25 23:19:22,542 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 55 treesize of output 58 [2022-11-25 23:19:22,552 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 18 treesize of output 12 [2022-11-25 23:19:22,569 INFO L321 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2022-11-25 23:19:22,570 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 38 treesize of output 25 [2022-11-25 23:19:22,586 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-25 23:19:22,586 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 43 treesize of output 47 [2022-11-25 23:19:22,676 INFO L321 Elim1Store]: treesize reduction 94, result has 21.0 percent of original size [2022-11-25 23:19:22,678 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 98 treesize of output 98 [2022-11-25 23:19:22,739 INFO L321 Elim1Store]: treesize reduction 39, result has 35.0 percent of original size [2022-11-25 23:19:22,739 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 55 treesize of output 58 [2022-11-25 23:19:22,748 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 18 treesize of output 12 [2022-11-25 23:19:22,761 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:22,762 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 25 [2022-11-25 23:19:22,788 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 20 for LOIs [2022-11-25 23:19:22,799 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:19:23,524 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5757#(and (exists ((|v_ULTIMATE.start_main_~#bb~0#1.base_BEFORE_CALL_9| Int)) (and (<= 0 |v_ULTIMATE.start_main_~#bb~0#1.base_BEFORE_CALL_9|) (= |__VERIFIER_assert_#in~cond| (ite (<= 0 (select (select |#memory_int| |v_ULTIMATE.start_main_~#bb~0#1.base_BEFORE_CALL_9|) 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 [2022-11-25 23:19:23,524 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:19:23,524 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:19:23,524 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [101, 101, 101] total 201 [2022-11-25 23:19:23,525 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1078539272] [2022-11-25 23:19:23,525 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:19:23,525 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 202 states [2022-11-25 23:19:23,525 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:19:23,533 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 202 interpolants. [2022-11-25 23:19:23,536 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20321, Invalid=23151, Unknown=0, NotChecked=0, Total=43472 [2022-11-25 23:19:23,537 INFO L87 Difference]: Start difference. First operand 136 states and 140 transitions. Second operand has 202 states, 202 states have (on average 1.0297029702970297) internal successors, (208), 201 states have internal predecessors, (208), 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) [2022-11-25 23:19:24,154 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:19:24,154 INFO L93 Difference]: Finished difference Result 272 states and 380 transitions. [2022-11-25 23:19:24,154 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 202 states. [2022-11-25 23:19:24,155 INFO L78 Accepts]: Start accepts. Automaton has has 202 states, 202 states have (on average 1.0297029702970297) internal successors, (208), 201 states have internal predecessors, (208), 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 129 [2022-11-25 23:19:24,155 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:19:24,156 INFO L225 Difference]: With dead ends: 272 [2022-11-25 23:19:24,157 INFO L226 Difference]: Without dead ends: 237 [2022-11-25 23:19:24,161 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 486 GetRequests, 279 SyntacticMatches, 0 SemanticMatches, 207 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2090 ImplicationChecksByTransitivity, 16.5s TimeCoverageRelationStatistics Valid=20321, Invalid=23151, Unknown=0, NotChecked=0, Total=43472 [2022-11-25 23:19:24,162 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 0 mSDsluCounter, 88 mSDsCounter, 0 mSdLazyCounter, 256 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 99 SdHoareTripleChecker+Invalid, 257 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 256 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-25 23:19:24,162 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 99 Invalid, 257 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 256 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-25 23:19:24,163 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 237 states. [2022-11-25 23:19:24,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 237 to 237. [2022-11-25 23:19:24,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 237 states, 233 states have (on average 1.0171673819742488) internal successors, (237), 233 states have internal predecessors, (237), 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) [2022-11-25 23:19:24,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 237 states to 237 states and 241 transitions. [2022-11-25 23:19:24,190 INFO L78 Accepts]: Start accepts. Automaton has 237 states and 241 transitions. Word has length 129 [2022-11-25 23:19:24,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:19:24,191 INFO L495 AbstractCegarLoop]: Abstraction has 237 states and 241 transitions. [2022-11-25 23:19:24,192 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 202 states, 202 states have (on average 1.0297029702970297) internal successors, (208), 201 states have internal predecessors, (208), 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) [2022-11-25 23:19:24,192 INFO L276 IsEmpty]: Start isEmpty. Operand 237 states and 241 transitions. [2022-11-25 23:19:24,194 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 231 [2022-11-25 23:19:24,195 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:19:24,195 INFO L195 NwaCegarLoop]: trace histogram [200, 22, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:19:24,203 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_263a91de-7b08-47bf-a4ae-41a479322afc/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-25 23:19:24,402 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_263a91de-7b08-47bf-a4ae-41a479322afc/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:19:24,403 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:19:24,403 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:19:24,403 INFO L85 PathProgramCache]: Analyzing trace with hash -1330295413, now seen corresponding path program 10 times [2022-11-25 23:19:24,403 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:19:24,403 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1094044826] [2022-11-25 23:19:24,403 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:19:24,404 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:19:24,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:19:49,026 INFO L134 CoverageAnalysis]: Checked inductivity of 20353 backedges. 0 proven. 20100 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-11-25 23:19:49,027 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:19:49,027 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1094044826] [2022-11-25 23:19:49,027 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1094044826] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:19:49,027 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2039800395] [2022-11-25 23:19:49,028 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 23:19:49,028 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:19:49,028 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_263a91de-7b08-47bf-a4ae-41a479322afc/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:19:49,032 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_263a91de-7b08-47bf-a4ae-41a479322afc/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:19:49,062 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_263a91de-7b08-47bf-a4ae-41a479322afc/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-25 23:19:49,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:19:49,654 INFO L263 TraceCheckSpWp]: Trace formula consists of 2103 conjuncts, 202 conjunts are in the unsatisfiable core [2022-11-25 23:19:49,662 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:19:50,006 INFO L134 CoverageAnalysis]: Checked inductivity of 20353 backedges. 0 proven. 20100 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-11-25 23:19:50,006 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:20:38,282 INFO L134 CoverageAnalysis]: Checked inductivity of 20353 backedges. 0 proven. 20100 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-11-25 23:20:38,282 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2039800395] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:20:38,283 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1340105431] [2022-11-25 23:20:38,284 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-25 23:20:38,284 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:20:38,284 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:20:38,284 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:20:38,284 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:20:38,304 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:38,306 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:38,308 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:38,366 INFO L321 Elim1Store]: treesize reduction 129, result has 17.8 percent of original size [2022-11-25 23:20:38,366 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 9 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 55 treesize of output 73 [2022-11-25 23:20:38,380 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:38,381 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:38,382 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:38,383 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 13 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 32 [2022-11-25 23:20:38,407 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:38,407 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 6 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-25 23:20:38,482 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:38,485 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:38,499 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-25 23:20:38,499 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 334 treesize of output 322 [2022-11-25 23:20:38,577 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 16 treesize of output 12 [2022-11-25 23:20:38,601 INFO L321 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-11-25 23:20:38,602 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 24 treesize of output 19 [2022-11-25 23:20:38,618 INFO L321 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-11-25 23:20:38,618 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 23 treesize of output 18 [2022-11-25 23:20:38,684 INFO L321 Elim1Store]: treesize reduction 94, result has 21.0 percent of original size [2022-11-25 23:20:38,685 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 98 treesize of output 98 [2022-11-25 23:20:38,790 INFO L321 Elim1Store]: treesize reduction 39, result has 35.0 percent of original size [2022-11-25 23:20:38,791 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 41 treesize of output 44 [2022-11-25 23:20:38,800 WARN L207 Elim1Store]: Array PQE input equivalent to false [2022-11-25 23:20:38,809 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:38,810 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 7 [2022-11-25 23:20:38,817 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:38,818 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 7 [2022-11-25 23:20:38,885 INFO L321 Elim1Store]: treesize reduction 39, result has 35.0 percent of original size [2022-11-25 23:20:38,886 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 55 treesize of output 58 [2022-11-25 23:20:38,895 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 18 treesize of output 12 [2022-11-25 23:20:38,911 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-25 23:20:38,912 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 43 treesize of output 47 [2022-11-25 23:20:38,925 INFO L321 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2022-11-25 23:20:38,926 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 38 treesize of output 25 [2022-11-25 23:20:38,989 INFO L321 Elim1Store]: treesize reduction 94, result has 21.0 percent of original size [2022-11-25 23:20:38,989 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 98 treesize of output 98 [2022-11-25 23:20:39,051 INFO L321 Elim1Store]: treesize reduction 39, result has 35.0 percent of original size [2022-11-25 23:20:39,052 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 88 treesize of output 85 [2022-11-25 23:20:39,060 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 16 treesize of output 10 [2022-11-25 23:20:39,076 INFO L321 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2022-11-25 23:20:39,076 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 65 treesize of output 31 [2022-11-25 23:20:39,089 INFO L321 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2022-11-25 23:20:39,089 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 70 treesize of output 36 [2022-11-25 23:20:39,108 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 20 for LOIs [2022-11-25 23:20:39,121 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:20:40,319 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8537#(and (exists ((|v_ULTIMATE.start_main_~#bb~0#1.base_BEFORE_CALL_10| Int)) (and (<= 0 |v_ULTIMATE.start_main_~#bb~0#1.base_BEFORE_CALL_10|) (= |__VERIFIER_assert_#in~cond| (ite (<= 0 (select (select |#memory_int| |v_ULTIMATE.start_main_~#bb~0#1.base_BEFORE_CALL_10|) 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 [2022-11-25 23:20:40,319 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:20:40,319 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:20:40,319 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [202, 202, 202] total 403 [2022-11-25 23:20:40,319 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [495475808] [2022-11-25 23:20:40,319 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:20:40,321 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 404 states [2022-11-25 23:20:40,321 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:20:40,337 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 404 interpolants. [2022-11-25 23:20:40,351 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81426, Invalid=87084, Unknown=0, NotChecked=0, Total=168510 [2022-11-25 23:20:40,352 INFO L87 Difference]: Start difference. First operand 237 states and 241 transitions. Second operand has 404 states, 404 states have (on average 1.0148514851485149) internal successors, (410), 403 states have internal predecessors, (410), 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) [2022-11-25 23:20:43,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:20:43,037 INFO L93 Difference]: Finished difference Result 474 states and 683 transitions. [2022-11-25 23:20:43,037 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 404 states. [2022-11-25 23:20:43,038 INFO L78 Accepts]: Start accepts. Automaton has has 404 states, 404 states have (on average 1.0148514851485149) internal successors, (410), 403 states have internal predecessors, (410), 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 230 [2022-11-25 23:20:43,038 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:20:43,041 INFO L225 Difference]: With dead ends: 474 [2022-11-25 23:20:43,041 INFO L226 Difference]: Without dead ends: 439 [2022-11-25 23:20:43,049 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 890 GetRequests, 481 SyntacticMatches, 0 SemanticMatches, 409 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4211 ImplicationChecksByTransitivity, 64.9s TimeCoverageRelationStatistics Valid=81426, Invalid=87084, Unknown=0, NotChecked=0, Total=168510 [2022-11-25 23:20:43,049 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 0 mSDsluCounter, 99 mSDsCounter, 0 mSdLazyCounter, 464 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 110 SdHoareTripleChecker+Invalid, 465 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 464 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-25 23:20:43,050 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 110 Invalid, 465 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 464 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-25 23:20:43,051 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 439 states. [2022-11-25 23:20:43,076 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 439 to 439. [2022-11-25 23:20:43,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 439 states, 435 states have (on average 1.0091954022988505) internal successors, (439), 435 states have internal predecessors, (439), 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) [2022-11-25 23:20:43,079 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 439 states to 439 states and 443 transitions. [2022-11-25 23:20:43,079 INFO L78 Accepts]: Start accepts. Automaton has 439 states and 443 transitions. Word has length 230 [2022-11-25 23:20:43,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:20:43,079 INFO L495 AbstractCegarLoop]: Abstraction has 439 states and 443 transitions. [2022-11-25 23:20:43,080 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 404 states, 404 states have (on average 1.0148514851485149) internal successors, (410), 403 states have internal predecessors, (410), 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) [2022-11-25 23:20:43,080 INFO L276 IsEmpty]: Start isEmpty. Operand 439 states and 443 transitions. [2022-11-25 23:20:43,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 433 [2022-11-25 23:20:43,089 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:20:43,089 INFO L195 NwaCegarLoop]: trace histogram [402, 22, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:20:43,107 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_263a91de-7b08-47bf-a4ae-41a479322afc/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-25 23:20:43,304 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_263a91de-7b08-47bf-a4ae-41a479322afc/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-11-25 23:20:43,304 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:20:43,304 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:20:43,304 INFO L85 PathProgramCache]: Analyzing trace with hash -1480613749, now seen corresponding path program 11 times [2022-11-25 23:20:43,305 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:20:43,305 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1135116350] [2022-11-25 23:20:43,305 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:20:43,305 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:20:44,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:22:22,113 INFO L134 CoverageAnalysis]: Checked inductivity of 81256 backedges. 0 proven. 81003 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-11-25 23:22:22,113 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:22:22,113 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1135116350] [2022-11-25 23:22:22,113 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1135116350] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:22:22,114 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1008752703] [2022-11-25 23:22:22,114 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:22:22,114 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:22:22,114 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_263a91de-7b08-47bf-a4ae-41a479322afc/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:22:22,119 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_263a91de-7b08-47bf-a4ae-41a479322afc/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:22:22,141 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_263a91de-7b08-47bf-a4ae-41a479322afc/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process