./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/ps6-ll_valuebound100.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 5e519f3a 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_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/ps6-ll_valuebound100.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI --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 b8588da8d66d82eb7aa3eaf3ef7c4d24b2b275bf9c1acdf38a110c8bc6eba3b7 --- 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-5e519f3 [2022-11-03 02:10:34,923 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-03 02:10:34,927 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-03 02:10:34,996 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-03 02:10:34,999 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-03 02:10:35,006 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-03 02:10:35,008 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-03 02:10:35,011 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-03 02:10:35,015 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-03 02:10:35,023 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-03 02:10:35,024 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-03 02:10:35,026 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-03 02:10:35,029 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-03 02:10:35,035 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-03 02:10:35,037 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-03 02:10:35,038 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-03 02:10:35,039 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-03 02:10:35,045 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-03 02:10:35,047 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-03 02:10:35,050 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-03 02:10:35,055 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-03 02:10:35,058 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-03 02:10:35,060 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-03 02:10:35,062 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-03 02:10:35,067 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-03 02:10:35,073 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-03 02:10:35,073 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-03 02:10:35,075 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-03 02:10:35,077 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-03 02:10:35,078 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-03 02:10:35,078 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-03 02:10:35,079 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-03 02:10:35,081 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-03 02:10:35,082 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-03 02:10:35,085 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-03 02:10:35,086 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-03 02:10:35,087 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-03 02:10:35,088 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-03 02:10:35,088 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-03 02:10:35,089 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-03 02:10:35,090 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-03 02:10:35,091 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-03 02:10:35,128 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-03 02:10:35,129 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-03 02:10:35,129 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-03 02:10:35,130 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-03 02:10:35,130 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-03 02:10:35,131 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-03 02:10:35,131 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-03 02:10:35,131 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-03 02:10:35,131 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-03 02:10:35,132 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-03 02:10:35,132 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-03 02:10:35,132 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-03 02:10:35,132 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-03 02:10:35,132 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-03 02:10:35,133 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-03 02:10:35,133 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-03 02:10:35,133 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-03 02:10:35,133 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-03 02:10:35,134 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-03 02:10:35,134 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-03 02:10:35,135 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-03 02:10:35,135 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-03 02:10:35,135 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-03 02:10:35,135 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-03 02:10:35,136 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-03 02:10:35,136 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-03 02:10:35,136 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-03 02:10:35,136 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-03 02:10:35,137 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-03 02:10:35,137 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-03 02:10:35,137 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-03 02:10:35,137 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-03 02:10:35,138 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-03 02:10:35,138 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-03 02:10:35,138 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-03 02:10:35,138 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-03 02:10:35,139 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-03 02:10:35,139 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-03 02:10:35,139 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-03 02:10:35,139 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-03 02:10:35,140 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-03 02:10:35,140 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_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> b8588da8d66d82eb7aa3eaf3ef7c4d24b2b275bf9c1acdf38a110c8bc6eba3b7 [2022-11-03 02:10:35,507 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-03 02:10:35,549 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-03 02:10:35,552 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-03 02:10:35,553 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-03 02:10:35,554 INFO L275 PluginConnector]: CDTParser initialized [2022-11-03 02:10:35,556 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/../../sv-benchmarks/c/nla-digbench-scaling/ps6-ll_valuebound100.c [2022-11-03 02:10:35,636 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/data/e5f7c93c7/b02268d184714022828fab6941b1d650/FLAG3a58a0c1a [2022-11-03 02:10:36,139 INFO L306 CDTParser]: Found 1 translation units. [2022-11-03 02:10:36,139 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/sv-benchmarks/c/nla-digbench-scaling/ps6-ll_valuebound100.c [2022-11-03 02:10:36,149 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/data/e5f7c93c7/b02268d184714022828fab6941b1d650/FLAG3a58a0c1a [2022-11-03 02:10:36,509 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/data/e5f7c93c7/b02268d184714022828fab6941b1d650 [2022-11-03 02:10:36,512 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-03 02:10:36,514 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-03 02:10:36,517 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-03 02:10:36,518 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-03 02:10:36,522 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-03 02:10:36,524 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 02:10:36" (1/1) ... [2022-11-03 02:10:36,525 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@44ca4346 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:10:36, skipping insertion in model container [2022-11-03 02:10:36,526 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 02:10:36" (1/1) ... [2022-11-03 02:10:36,535 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-03 02:10:36,557 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-03 02:10:36,834 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/sv-benchmarks/c/nla-digbench-scaling/ps6-ll_valuebound100.c[458,471] [2022-11-03 02:10:36,887 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-03 02:10:36,898 INFO L203 MainTranslator]: Completed pre-run [2022-11-03 02:10:36,914 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/sv-benchmarks/c/nla-digbench-scaling/ps6-ll_valuebound100.c[458,471] [2022-11-03 02:10:36,923 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-03 02:10:36,939 INFO L208 MainTranslator]: Completed translation [2022-11-03 02:10:36,940 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:10:36 WrapperNode [2022-11-03 02:10:36,940 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-03 02:10:36,941 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-03 02:10:36,942 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-03 02:10:36,942 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-03 02:10:36,951 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:10:36" (1/1) ... [2022-11-03 02:10:36,961 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:10:36" (1/1) ... [2022-11-03 02:10:36,991 INFO L138 Inliner]: procedures = 14, calls = 12, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 36 [2022-11-03 02:10:36,992 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-03 02:10:36,993 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-03 02:10:36,993 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-03 02:10:36,993 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-03 02:10:37,006 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:10:36" (1/1) ... [2022-11-03 02:10:37,006 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:10:36" (1/1) ... [2022-11-03 02:10:37,020 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:10:36" (1/1) ... [2022-11-03 02:10:37,022 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:10:36" (1/1) ... [2022-11-03 02:10:37,026 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:10:36" (1/1) ... [2022-11-03 02:10:37,037 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:10:36" (1/1) ... [2022-11-03 02:10:37,039 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:10:36" (1/1) ... [2022-11-03 02:10:37,041 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:10:36" (1/1) ... [2022-11-03 02:10:37,043 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-03 02:10:37,052 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-03 02:10:37,053 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-03 02:10:37,053 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-03 02:10:37,054 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:10:36" (1/1) ... [2022-11-03 02:10:37,063 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-03 02:10:37,078 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:10:37,097 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-03 02:10:37,111 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-03 02:10:37,165 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-03 02:10:37,166 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-11-03 02:10:37,166 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-11-03 02:10:37,166 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-03 02:10:37,166 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-03 02:10:37,167 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-03 02:10:37,167 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-11-03 02:10:37,167 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-11-03 02:10:37,257 INFO L235 CfgBuilder]: Building ICFG [2022-11-03 02:10:37,261 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-03 02:10:37,507 INFO L276 CfgBuilder]: Performing block encoding [2022-11-03 02:10:37,533 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-03 02:10:37,533 INFO L300 CfgBuilder]: Removed 1 assume(true) statements. [2022-11-03 02:10:37,536 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 02:10:37 BoogieIcfgContainer [2022-11-03 02:10:37,537 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-03 02:10:37,540 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-03 02:10:37,540 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-03 02:10:37,545 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-03 02:10:37,546 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 03.11 02:10:36" (1/3) ... [2022-11-03 02:10:37,547 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7285b79b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 02:10:37, skipping insertion in model container [2022-11-03 02:10:37,547 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:10:36" (2/3) ... [2022-11-03 02:10:37,547 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7285b79b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 02:10:37, skipping insertion in model container [2022-11-03 02:10:37,548 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 02:10:37" (3/3) ... [2022-11-03 02:10:37,565 INFO L112 eAbstractionObserver]: Analyzing ICFG ps6-ll_valuebound100.c [2022-11-03 02:10:37,588 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-03 02:10:37,588 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-03 02:10:37,647 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-03 02:10:37,655 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;@12951e44, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-03 02:10:37,656 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-03 02:10:37,661 INFO L276 IsEmpty]: Start isEmpty. Operand has 19 states, 10 states have (on average 1.4) internal successors, (14), 11 states have internal predecessors, (14), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-11-03 02:10:37,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-03 02:10:37,670 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:10:37,671 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:10:37,672 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:10:37,678 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:10:37,692 INFO L85 PathProgramCache]: Analyzing trace with hash 2113922188, now seen corresponding path program 1 times [2022-11-03 02:10:37,705 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:10:37,711 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [461396258] [2022-11-03 02:10:37,712 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:10:37,713 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:10:37,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:10:37,938 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:10:37,939 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [461396258] [2022-11-03 02:10:37,940 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unsupported non-linear arithmetic [2022-11-03 02:10:37,941 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [197707165] [2022-11-03 02:10:37,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:10:37,943 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:10:37,944 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:10:37,948 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:10:37,954 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-03 02:10:38,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:10:38,076 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 1 conjunts are in the unsatisfiable core [2022-11-03 02:10:38,082 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:10:38,126 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-03 02:10:38,127 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 02:10:38,130 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [197707165] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:10:38,131 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 02:10:38,131 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-03 02:10:38,134 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [730941508] [2022-11-03 02:10:38,135 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:10:38,143 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-11-03 02:10:38,143 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:10:38,181 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-11-03 02:10:38,182 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-03 02:10:38,185 INFO L87 Difference]: Start difference. First operand has 19 states, 10 states have (on average 1.4) internal successors, (14), 11 states have internal predecessors, (14), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Second operand has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-03 02:10:38,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:10:38,220 INFO L93 Difference]: Finished difference Result 32 states and 44 transitions. [2022-11-03 02:10:38,225 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-11-03 02:10:38,227 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 13 [2022-11-03 02:10:38,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:10:38,237 INFO L225 Difference]: With dead ends: 32 [2022-11-03 02:10:38,237 INFO L226 Difference]: Without dead ends: 17 [2022-11-03 02:10:38,241 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-03 02:10:38,246 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 3 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-03 02:10:38,247 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 19 Invalid, 3 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-03 02:10:38,270 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2022-11-03 02:10:38,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2022-11-03 02:10:38,293 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 10 states have internal predecessors, (11), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-11-03 02:10:38,294 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 20 transitions. [2022-11-03 02:10:38,296 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 20 transitions. Word has length 13 [2022-11-03 02:10:38,298 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:10:38,299 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 20 transitions. [2022-11-03 02:10:38,299 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-03 02:10:38,300 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 20 transitions. [2022-11-03 02:10:38,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-03 02:10:38,301 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:10:38,302 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:10:38,354 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-03 02:10:38,524 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2022-11-03 02:10:38,525 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:10:38,526 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:10:38,526 INFO L85 PathProgramCache]: Analyzing trace with hash 2066763035, now seen corresponding path program 1 times [2022-11-03 02:10:38,526 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:10:38,527 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1686051041] [2022-11-03 02:10:38,527 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:10:38,527 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:10:38,573 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:10:38,579 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1170534645] [2022-11-03 02:10:38,579 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:10:38,579 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:10:38,580 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:10:38,585 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:10:38,617 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-03 02:10:38,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:10:38,684 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 7 conjunts are in the unsatisfiable core [2022-11-03 02:10:38,687 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:10:38,828 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-03 02:10:38,829 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 02:10:38,833 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:10:38,836 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1686051041] [2022-11-03 02:10:38,837 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:10:38,837 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1170534645] [2022-11-03 02:10:38,840 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1170534645] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:10:38,841 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 02:10:38,841 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-03 02:10:38,841 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1264437074] [2022-11-03 02:10:38,842 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:10:38,849 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-03 02:10:38,850 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:10:38,850 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-03 02:10:38,853 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-03 02:10:38,854 INFO L87 Difference]: Start difference. First operand 17 states and 20 transitions. Second operand has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-03 02:12:01,130 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.37m for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:12:01,183 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:12:01,183 INFO L93 Difference]: Finished difference Result 28 states and 33 transitions. [2022-11-03 02:12:01,184 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-03 02:12:01,185 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 13 [2022-11-03 02:12:01,185 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:12:01,186 INFO L225 Difference]: With dead ends: 28 [2022-11-03 02:12:01,186 INFO L226 Difference]: Without dead ends: 24 [2022-11-03 02:12:01,187 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-03 02:12:01,188 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 6 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 2 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 82.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 50 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 82.3s IncrementalHoareTripleChecker+Time [2022-11-03 02:12:01,190 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 50 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 34 Invalid, 1 Unknown, 0 Unchecked, 82.3s Time] [2022-11-03 02:12:01,191 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2022-11-03 02:12:01,198 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2022-11-03 02:12:01,198 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 15 states have internal predecessors, (16), 6 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-11-03 02:12:01,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 27 transitions. [2022-11-03 02:12:01,200 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 27 transitions. Word has length 13 [2022-11-03 02:12:01,200 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:12:01,201 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 27 transitions. [2022-11-03 02:12:01,201 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-03 02:12:01,201 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 27 transitions. [2022-11-03 02:12:01,202 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-11-03 02:12:01,203 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:12:01,203 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:12:01,249 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-03 02:12:01,416 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:12:01,417 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:12:01,418 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:12:01,418 INFO L85 PathProgramCache]: Analyzing trace with hash 1985624712, now seen corresponding path program 1 times [2022-11-03 02:12:01,418 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:12:01,418 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1098930683] [2022-11-03 02:12:01,419 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:12:01,419 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:12:01,455 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:12:01,455 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1191914211] [2022-11-03 02:12:01,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:12:01,456 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:12:01,456 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:12:01,459 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:12:01,496 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-03 02:12:01,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:12:01,571 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-03 02:12:01,575 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:12:01,730 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-03 02:12:01,731 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:12:08,750 WARN L234 SmtUtils]: Spent 6.73s on a formula simplification that was a NOOP. DAG size: 17 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-03 02:12:08,916 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-03 02:12:08,917 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:12:08,917 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1098930683] [2022-11-03 02:12:08,917 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:12:08,918 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1191914211] [2022-11-03 02:12:08,918 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1191914211] provided 1 perfect and 1 imperfect interpolant sequences [2022-11-03 02:12:08,918 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-03 02:12:08,918 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 7 [2022-11-03 02:12:08,919 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [800421235] [2022-11-03 02:12:08,919 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:12:08,920 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-03 02:12:08,920 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:12:08,920 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-03 02:12:08,921 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2022-11-03 02:12:08,921 INFO L87 Difference]: Start difference. First operand 24 states and 27 transitions. Second operand has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-11-03 02:12:09,029 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:12:09,029 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2022-11-03 02:12:09,030 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-03 02:12:09,030 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 20 [2022-11-03 02:12:09,031 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:12:09,031 INFO L225 Difference]: With dead ends: 30 [2022-11-03 02:12:09,031 INFO L226 Difference]: Without dead ends: 26 [2022-11-03 02:12:09,032 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 31 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2022-11-03 02:12:09,033 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 6 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:12:09,034 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 40 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 02:12:09,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-11-03 02:12:09,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2022-11-03 02:12:09,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 16 states have (on average 1.0625) internal successors, (17), 16 states have internal predecessors, (17), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-11-03 02:12:09,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2022-11-03 02:12:09,055 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 20 [2022-11-03 02:12:09,055 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:12:09,055 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2022-11-03 02:12:09,056 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-11-03 02:12:09,056 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2022-11-03 02:12:09,057 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-11-03 02:12:09,057 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:12:09,057 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:12:09,136 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-03 02:12:09,296 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:12:09,297 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:12:09,297 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:12:09,298 INFO L85 PathProgramCache]: Analyzing trace with hash -1002189902, now seen corresponding path program 1 times [2022-11-03 02:12:09,298 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:12:09,298 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [8301073] [2022-11-03 02:12:09,298 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:12:09,298 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:12:09,316 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:12:09,317 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1082821529] [2022-11-03 02:12:09,317 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:12:09,317 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:12:09,318 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:12:09,319 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:12:09,343 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-03 02:12:09,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:12:09,430 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-03 02:12:09,433 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:12:09,637 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-11-03 02:12:09,638 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:12:09,992 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:12:09,992 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [8301073] [2022-11-03 02:12:09,992 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:12:09,992 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1082821529] [2022-11-03 02:12:09,993 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1082821529] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:12:09,993 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1975753205] [2022-11-03 02:12:10,018 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-03 02:12:10,018 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:12:10,023 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:12:10,030 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:12:10,030 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:12:11,088 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-03 02:12:11,098 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 75 for LOIs [2022-11-03 02:12:11,141 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:12:12,313 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '608#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:12:12,313 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:12:12,313 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-03 02:12:12,313 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2022-11-03 02:12:12,314 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [899101272] [2022-11-03 02:12:12,314 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-03 02:12:12,314 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-03 02:12:12,315 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:12:12,315 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-03 02:12:12,316 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=357, Unknown=0, NotChecked=0, Total=420 [2022-11-03 02:12:12,316 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 6 states have internal predecessors, (13), 4 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2022-11-03 02:12:12,508 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:12:12,509 INFO L93 Difference]: Finished difference Result 35 states and 39 transitions. [2022-11-03 02:12:12,509 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-03 02:12:12,509 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 6 states have internal predecessors, (13), 4 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) Word has length 31 [2022-11-03 02:12:12,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:12:12,512 INFO L225 Difference]: With dead ends: 35 [2022-11-03 02:12:12,512 INFO L226 Difference]: Without dead ends: 29 [2022-11-03 02:12:12,514 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 56 SyntacticMatches, 4 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=73, Invalid=433, Unknown=0, NotChecked=0, Total=506 [2022-11-03 02:12:12,517 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 2 mSDsluCounter, 70 mSDsCounter, 0 mSdLazyCounter, 68 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 68 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:12:12,518 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 84 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 68 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 02:12:12,518 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2022-11-03 02:12:12,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2022-11-03 02:12:12,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 18 states have (on average 1.0555555555555556) internal successors, (19), 18 states have internal predecessors, (19), 7 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-03 02:12:12,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 32 transitions. [2022-11-03 02:12:12,544 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 32 transitions. Word has length 31 [2022-11-03 02:12:12,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:12:12,545 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 32 transitions. [2022-11-03 02:12:12,547 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 6 states have internal predecessors, (13), 4 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2022-11-03 02:12:12,547 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 32 transitions. [2022-11-03 02:12:12,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-11-03 02:12:12,550 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:12:12,550 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:12:12,595 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-03 02:12:12,776 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:12:12,777 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:12:12,777 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:12:12,777 INFO L85 PathProgramCache]: Analyzing trace with hash -180873249, now seen corresponding path program 2 times [2022-11-03 02:12:12,777 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:12:12,778 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [75737949] [2022-11-03 02:12:12,778 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:12:12,778 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:12:12,794 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:12:12,794 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1168294984] [2022-11-03 02:12:12,794 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:12:12,795 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:12:12,795 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:12:12,796 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:12:12,814 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-03 02:12:13,378 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-03 02:12:13,378 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:12:13,380 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 16 conjunts are in the unsatisfiable core [2022-11-03 02:12:13,383 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:12:13,535 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 8 proven. 9 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-11-03 02:12:13,535 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:12:13,750 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:12:13,750 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [75737949] [2022-11-03 02:12:13,751 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:12:13,751 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1168294984] [2022-11-03 02:12:13,751 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1168294984] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:12:13,751 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [681561202] [2022-11-03 02:12:13,756 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-03 02:12:13,756 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:12:13,757 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:12:13,757 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:12:13,757 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:12:14,824 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-03 02:12:14,832 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 75 for LOIs [2022-11-03 02:12:14,867 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:12:16,040 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '894#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:12:16,041 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:12:16,041 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-03 02:12:16,041 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2022-11-03 02:12:16,041 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1555782191] [2022-11-03 02:12:16,041 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-03 02:12:16,042 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-03 02:12:16,042 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:12:16,042 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-03 02:12:16,042 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=396, Unknown=0, NotChecked=0, Total=462 [2022-11-03 02:12:16,043 INFO L87 Difference]: Start difference. First operand 29 states and 32 transitions. Second operand has 8 states, 7 states have (on average 2.142857142857143) internal successors, (15), 7 states have internal predecessors, (15), 5 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2022-11-03 02:12:16,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:12:16,220 INFO L93 Difference]: Finished difference Result 38 states and 43 transitions. [2022-11-03 02:12:16,220 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-03 02:12:16,221 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.142857142857143) internal successors, (15), 7 states have internal predecessors, (15), 5 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) Word has length 38 [2022-11-03 02:12:16,221 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:12:16,222 INFO L225 Difference]: With dead ends: 38 [2022-11-03 02:12:16,222 INFO L226 Difference]: Without dead ends: 32 [2022-11-03 02:12:16,223 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 69 SyntacticMatches, 4 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=76, Invalid=476, Unknown=0, NotChecked=0, Total=552 [2022-11-03 02:12:16,223 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 2 mSDsluCounter, 91 mSDsCounter, 0 mSdLazyCounter, 97 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 107 SdHoareTripleChecker+Invalid, 98 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 97 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:12:16,224 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 107 Invalid, 98 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 97 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 02:12:16,225 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2022-11-03 02:12:16,242 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2022-11-03 02:12:16,242 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 20 states have (on average 1.05) internal successors, (21), 20 states have internal predecessors, (21), 8 states have call successors, (8), 4 states have call predecessors, (8), 3 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2022-11-03 02:12:16,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 36 transitions. [2022-11-03 02:12:16,247 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 36 transitions. Word has length 38 [2022-11-03 02:12:16,248 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:12:16,248 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 36 transitions. [2022-11-03 02:12:16,252 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.142857142857143) internal successors, (15), 7 states have internal predecessors, (15), 5 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2022-11-03 02:12:16,252 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 36 transitions. [2022-11-03 02:12:16,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-11-03 02:12:16,258 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:12:16,258 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 4, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:12:16,271 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-03 02:12:16,465 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:12:16,466 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:12:16,466 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:12:16,466 INFO L85 PathProgramCache]: Analyzing trace with hash -1515507950, now seen corresponding path program 3 times [2022-11-03 02:12:16,467 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:12:16,467 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1910222167] [2022-11-03 02:12:16,467 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:12:16,467 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:12:16,479 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:12:16,479 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1126771440] [2022-11-03 02:12:16,479 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 02:12:16,480 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:12:16,480 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:12:16,481 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:12:16,512 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-03 02:12:16,543 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 02:12:16,544 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:12:16,545 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-03 02:12:16,547 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:12:16,736 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 10 proven. 18 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2022-11-03 02:12:16,736 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:12:17,041 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:12:17,041 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1910222167] [2022-11-03 02:12:17,041 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:12:17,042 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1126771440] [2022-11-03 02:12:17,042 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1126771440] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:12:17,042 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1277040357] [2022-11-03 02:12:17,045 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-03 02:12:17,045 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:12:17,045 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:12:17,046 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:12:17,046 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:12:17,666 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-03 02:12:17,673 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 75 for LOIs [2022-11-03 02:12:17,704 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:12:18,659 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1212#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:12:18,659 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:12:18,659 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-03 02:12:18,659 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2022-11-03 02:12:18,659 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1716475253] [2022-11-03 02:12:18,660 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-03 02:12:18,660 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-11-03 02:12:18,660 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:12:18,661 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-11-03 02:12:18,661 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=437, Unknown=0, NotChecked=0, Total=506 [2022-11-03 02:12:18,661 INFO L87 Difference]: Start difference. First operand 32 states and 36 transitions. Second operand has 9 states, 8 states have (on average 2.125) internal successors, (17), 8 states have internal predecessors, (17), 6 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 6 states have call predecessors, (7), 6 states have call successors, (7) [2022-11-03 02:12:18,890 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:12:18,890 INFO L93 Difference]: Finished difference Result 41 states and 47 transitions. [2022-11-03 02:12:18,891 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-03 02:12:18,891 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 2.125) internal successors, (17), 8 states have internal predecessors, (17), 6 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 6 states have call predecessors, (7), 6 states have call successors, (7) Word has length 45 [2022-11-03 02:12:18,892 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:12:18,892 INFO L225 Difference]: With dead ends: 41 [2022-11-03 02:12:18,892 INFO L226 Difference]: Without dead ends: 35 [2022-11-03 02:12:18,893 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 82 SyntacticMatches, 4 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=79, Invalid=521, Unknown=0, NotChecked=0, Total=600 [2022-11-03 02:12:18,894 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 2 mSDsluCounter, 114 mSDsCounter, 0 mSdLazyCounter, 132 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 132 SdHoareTripleChecker+Invalid, 133 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 132 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 02:12:18,895 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 132 Invalid, 133 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 132 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 02:12:18,896 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2022-11-03 02:12:18,908 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2022-11-03 02:12:18,909 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 22 states have (on average 1.0454545454545454) internal successors, (23), 22 states have internal predecessors, (23), 9 states have call successors, (9), 4 states have call predecessors, (9), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-11-03 02:12:18,910 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 40 transitions. [2022-11-03 02:12:18,910 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 40 transitions. Word has length 45 [2022-11-03 02:12:18,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:12:18,911 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 40 transitions. [2022-11-03 02:12:18,911 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 2.125) internal successors, (17), 8 states have internal predecessors, (17), 6 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 6 states have call predecessors, (7), 6 states have call successors, (7) [2022-11-03 02:12:18,911 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 40 transitions. [2022-11-03 02:12:18,912 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-11-03 02:12:18,913 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:12:18,913 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 5, 5, 5, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:12:18,960 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2022-11-03 02:12:19,132 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-11-03 02:12:19,133 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:12:19,133 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:12:19,133 INFO L85 PathProgramCache]: Analyzing trace with hash 180103295, now seen corresponding path program 4 times [2022-11-03 02:12:19,133 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:12:19,133 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1409357065] [2022-11-03 02:12:19,134 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:12:19,134 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:12:19,149 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:12:19,164 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [89515045] [2022-11-03 02:12:19,164 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 02:12:19,165 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:12:19,165 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:12:19,166 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:12:19,192 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-03 02:12:19,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:12:19,570 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-03 02:12:19,573 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:12:19,791 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 12 proven. 30 refuted. 0 times theorem prover too weak. 62 trivial. 0 not checked. [2022-11-03 02:12:19,792 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:12:20,044 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:12:20,044 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1409357065] [2022-11-03 02:12:20,045 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:12:20,045 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [89515045] [2022-11-03 02:12:20,045 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [89515045] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:12:20,045 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [482923960] [2022-11-03 02:12:20,049 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-03 02:12:20,049 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:12:20,050 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:12:20,050 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:12:20,050 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:12:20,605 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-03 02:12:20,611 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 75 for LOIs [2022-11-03 02:12:20,641 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:12:21,741 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1562#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:12:21,741 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:12:21,741 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-03 02:12:21,741 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2022-11-03 02:12:21,741 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1754600705] [2022-11-03 02:12:21,742 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-03 02:12:21,742 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-11-03 02:12:21,742 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:12:21,743 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-11-03 02:12:21,743 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=480, Unknown=0, NotChecked=0, Total=552 [2022-11-03 02:12:21,743 INFO L87 Difference]: Start difference. First operand 35 states and 40 transitions. Second operand has 10 states, 9 states have (on average 2.111111111111111) internal successors, (19), 9 states have internal predecessors, (19), 7 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 7 states have call predecessors, (8), 7 states have call successors, (8) [2022-11-03 02:12:22,027 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:12:22,027 INFO L93 Difference]: Finished difference Result 44 states and 51 transitions. [2022-11-03 02:12:22,028 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-11-03 02:12:22,028 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 2.111111111111111) internal successors, (19), 9 states have internal predecessors, (19), 7 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 7 states have call predecessors, (8), 7 states have call successors, (8) Word has length 52 [2022-11-03 02:12:22,029 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:12:22,029 INFO L225 Difference]: With dead ends: 44 [2022-11-03 02:12:22,030 INFO L226 Difference]: Without dead ends: 38 [2022-11-03 02:12:22,030 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 95 SyntacticMatches, 4 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=82, Invalid=568, Unknown=0, NotChecked=0, Total=650 [2022-11-03 02:12:22,031 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 2 mSDsluCounter, 139 mSDsCounter, 0 mSdLazyCounter, 173 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 159 SdHoareTripleChecker+Invalid, 174 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 173 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 02:12:22,032 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 159 Invalid, 174 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 173 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 02:12:22,033 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2022-11-03 02:12:22,045 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2022-11-03 02:12:22,046 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 24 states have (on average 1.0416666666666667) internal successors, (25), 24 states have internal predecessors, (25), 10 states have call successors, (10), 4 states have call predecessors, (10), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-11-03 02:12:22,047 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 44 transitions. [2022-11-03 02:12:22,047 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 44 transitions. Word has length 52 [2022-11-03 02:12:22,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:12:22,048 INFO L495 AbstractCegarLoop]: Abstraction has 38 states and 44 transitions. [2022-11-03 02:12:22,048 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 2.111111111111111) internal successors, (19), 9 states have internal predecessors, (19), 7 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 7 states have call predecessors, (8), 7 states have call successors, (8) [2022-11-03 02:12:22,048 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 44 transitions. [2022-11-03 02:12:22,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-11-03 02:12:22,050 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:12:22,050 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 6, 6, 6, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:12:22,057 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-03 02:12:22,252 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:12:22,253 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:12:22,253 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:12:22,253 INFO L85 PathProgramCache]: Analyzing trace with hash 321989234, now seen corresponding path program 5 times [2022-11-03 02:12:22,253 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:12:22,253 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1121288386] [2022-11-03 02:12:22,254 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:12:22,254 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:12:22,267 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:12:22,267 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1041950811] [2022-11-03 02:12:22,267 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:12:22,268 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:12:22,268 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:12:22,269 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:12:22,278 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-03 02:12:23,388 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-11-03 02:12:23,388 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:12:23,390 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 28 conjunts are in the unsatisfiable core [2022-11-03 02:12:23,393 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:12:23,636 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 14 proven. 45 refuted. 0 times theorem prover too weak. 86 trivial. 0 not checked. [2022-11-03 02:12:23,637 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:12:23,908 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:12:23,908 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1121288386] [2022-11-03 02:12:23,908 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:12:23,908 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1041950811] [2022-11-03 02:12:23,908 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1041950811] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:12:23,908 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [295303809] [2022-11-03 02:12:23,911 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-03 02:12:23,911 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:12:23,912 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:12:23,912 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:12:23,912 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:12:24,454 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-03 02:12:24,460 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 75 for LOIs [2022-11-03 02:12:24,501 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:12:25,496 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1944#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:12:25,496 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:12:25,496 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-03 02:12:25,496 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2022-11-03 02:12:25,497 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [558527959] [2022-11-03 02:12:25,497 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-03 02:12:25,497 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-11-03 02:12:25,497 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:12:25,498 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-11-03 02:12:25,498 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=525, Unknown=0, NotChecked=0, Total=600 [2022-11-03 02:12:25,499 INFO L87 Difference]: Start difference. First operand 38 states and 44 transitions. Second operand has 11 states, 10 states have (on average 2.1) internal successors, (21), 10 states have internal predecessors, (21), 8 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 8 states have call predecessors, (9), 8 states have call successors, (9) [2022-11-03 02:12:25,836 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:12:25,836 INFO L93 Difference]: Finished difference Result 47 states and 55 transitions. [2022-11-03 02:12:25,837 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-03 02:12:25,837 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 2.1) internal successors, (21), 10 states have internal predecessors, (21), 8 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 8 states have call predecessors, (9), 8 states have call successors, (9) Word has length 59 [2022-11-03 02:12:25,838 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:12:25,838 INFO L225 Difference]: With dead ends: 47 [2022-11-03 02:12:25,838 INFO L226 Difference]: Without dead ends: 41 [2022-11-03 02:12:25,839 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 108 SyntacticMatches, 4 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=85, Invalid=617, Unknown=0, NotChecked=0, Total=702 [2022-11-03 02:12:25,840 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 2 mSDsluCounter, 166 mSDsCounter, 0 mSdLazyCounter, 220 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 188 SdHoareTripleChecker+Invalid, 221 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 220 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-03 02:12:25,841 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 188 Invalid, 221 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 220 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-03 02:12:25,841 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2022-11-03 02:12:25,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2022-11-03 02:12:25,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 26 states have (on average 1.0384615384615385) internal successors, (27), 26 states have internal predecessors, (27), 11 states have call successors, (11), 4 states have call predecessors, (11), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-11-03 02:12:25,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 48 transitions. [2022-11-03 02:12:25,861 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 48 transitions. Word has length 59 [2022-11-03 02:12:25,862 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:12:25,862 INFO L495 AbstractCegarLoop]: Abstraction has 41 states and 48 transitions. [2022-11-03 02:12:25,862 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 2.1) internal successors, (21), 10 states have internal predecessors, (21), 8 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 8 states have call predecessors, (9), 8 states have call successors, (9) [2022-11-03 02:12:25,863 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 48 transitions. [2022-11-03 02:12:25,864 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2022-11-03 02:12:25,864 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:12:25,864 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 7, 7, 7, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:12:25,877 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2022-11-03 02:12:26,071 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:12:26,072 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:12:26,072 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:12:26,073 INFO L85 PathProgramCache]: Analyzing trace with hash 151429407, now seen corresponding path program 6 times [2022-11-03 02:12:26,073 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:12:26,073 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1732863411] [2022-11-03 02:12:26,073 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:12:26,073 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:12:26,099 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:12:26,099 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1097413593] [2022-11-03 02:12:26,099 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 02:12:26,099 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:12:26,100 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:12:26,118 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:12:26,145 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-03 02:12:26,203 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 02:12:26,203 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:12:26,205 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 32 conjunts are in the unsatisfiable core [2022-11-03 02:12:26,216 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:12:26,459 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 16 proven. 63 refuted. 0 times theorem prover too weak. 114 trivial. 0 not checked. [2022-11-03 02:12:26,459 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:12:26,894 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:12:26,894 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1732863411] [2022-11-03 02:12:26,894 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:12:26,894 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1097413593] [2022-11-03 02:12:26,895 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1097413593] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:12:26,895 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1466892708] [2022-11-03 02:12:26,898 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-03 02:12:26,899 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:12:26,899 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:12:26,900 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:12:26,900 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:12:27,453 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-03 02:12:27,459 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 75 for LOIs [2022-11-03 02:12:27,485 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:12:28,494 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2358#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:12:28,495 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:12:28,495 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-03 02:12:28,495 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2022-11-03 02:12:28,495 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1005227938] [2022-11-03 02:12:28,495 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-03 02:12:28,496 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-11-03 02:12:28,496 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:12:28,497 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-11-03 02:12:28,497 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=572, Unknown=0, NotChecked=0, Total=650 [2022-11-03 02:12:28,498 INFO L87 Difference]: Start difference. First operand 41 states and 48 transitions. Second operand has 12 states, 11 states have (on average 2.090909090909091) internal successors, (23), 11 states have internal predecessors, (23), 9 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 9 states have call predecessors, (10), 9 states have call successors, (10) [2022-11-03 02:12:28,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:12:28,846 INFO L93 Difference]: Finished difference Result 50 states and 59 transitions. [2022-11-03 02:12:28,846 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-03 02:12:28,847 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 2.090909090909091) internal successors, (23), 11 states have internal predecessors, (23), 9 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 9 states have call predecessors, (10), 9 states have call successors, (10) Word has length 66 [2022-11-03 02:12:28,847 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:12:28,848 INFO L225 Difference]: With dead ends: 50 [2022-11-03 02:12:28,848 INFO L226 Difference]: Without dead ends: 44 [2022-11-03 02:12:28,849 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 121 SyntacticMatches, 4 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=88, Invalid=668, Unknown=0, NotChecked=0, Total=756 [2022-11-03 02:12:28,850 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 2 mSDsluCounter, 195 mSDsCounter, 0 mSdLazyCounter, 273 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 219 SdHoareTripleChecker+Invalid, 274 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 273 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-03 02:12:28,850 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 219 Invalid, 274 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 273 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-03 02:12:28,851 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-11-03 02:12:28,865 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2022-11-03 02:12:28,865 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 28 states have (on average 1.0357142857142858) internal successors, (29), 28 states have internal predecessors, (29), 12 states have call successors, (12), 4 states have call predecessors, (12), 3 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2022-11-03 02:12:28,866 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 52 transitions. [2022-11-03 02:12:28,866 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 52 transitions. Word has length 66 [2022-11-03 02:12:28,867 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:12:28,867 INFO L495 AbstractCegarLoop]: Abstraction has 44 states and 52 transitions. [2022-11-03 02:12:28,868 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 2.090909090909091) internal successors, (23), 11 states have internal predecessors, (23), 9 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 9 states have call predecessors, (10), 9 states have call successors, (10) [2022-11-03 02:12:28,868 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 52 transitions. [2022-11-03 02:12:28,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-11-03 02:12:28,869 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:12:28,870 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 8, 8, 8, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:12:28,913 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2022-11-03 02:12:29,096 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:12:29,097 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:12:29,097 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:12:29,097 INFO L85 PathProgramCache]: Analyzing trace with hash -949240366, now seen corresponding path program 7 times [2022-11-03 02:12:29,097 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:12:29,097 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [511572523] [2022-11-03 02:12:29,098 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:12:29,098 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:12:29,111 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:12:29,111 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1374535083] [2022-11-03 02:12:29,111 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 02:12:29,112 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:12:29,112 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:12:29,113 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:12:29,162 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-03 02:12:29,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:12:29,895 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 36 conjunts are in the unsatisfiable core [2022-11-03 02:12:29,898 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:12:30,181 INFO L134 CoverageAnalysis]: Checked inductivity of 248 backedges. 18 proven. 84 refuted. 0 times theorem prover too weak. 146 trivial. 0 not checked. [2022-11-03 02:12:30,182 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:12:30,379 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:12:30,379 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [511572523] [2022-11-03 02:12:30,379 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:12:30,379 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1374535083] [2022-11-03 02:12:30,379 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1374535083] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:12:30,379 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1852888549] [2022-11-03 02:12:30,381 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-03 02:12:30,382 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:12:30,382 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:12:30,383 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:12:30,383 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:12:30,921 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-03 02:12:30,926 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 75 for LOIs [2022-11-03 02:12:30,959 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:12:32,035 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2804#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:12:32,035 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:12:32,035 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-03 02:12:32,035 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2022-11-03 02:12:32,036 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [968257569] [2022-11-03 02:12:32,036 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-03 02:12:32,037 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-11-03 02:12:32,037 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:12:32,037 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-11-03 02:12:32,038 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=621, Unknown=0, NotChecked=0, Total=702 [2022-11-03 02:12:32,038 INFO L87 Difference]: Start difference. First operand 44 states and 52 transitions. Second operand has 13 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 12 states have internal predecessors, (25), 10 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (11), 10 states have call predecessors, (11), 10 states have call successors, (11) [2022-11-03 02:12:32,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:12:32,463 INFO L93 Difference]: Finished difference Result 53 states and 63 transitions. [2022-11-03 02:12:32,463 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-03 02:12:32,463 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 12 states have internal predecessors, (25), 10 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (11), 10 states have call predecessors, (11), 10 states have call successors, (11) Word has length 73 [2022-11-03 02:12:32,464 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:12:32,464 INFO L225 Difference]: With dead ends: 53 [2022-11-03 02:12:32,465 INFO L226 Difference]: Without dead ends: 47 [2022-11-03 02:12:32,465 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 134 SyntacticMatches, 4 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=91, Invalid=721, Unknown=0, NotChecked=0, Total=812 [2022-11-03 02:12:32,466 INFO L413 NwaCegarLoop]: 39 mSDtfsCounter, 2 mSDsluCounter, 226 mSDsCounter, 0 mSdLazyCounter, 332 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 252 SdHoareTripleChecker+Invalid, 333 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 332 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-03 02:12:32,466 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 252 Invalid, 333 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 332 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-03 02:12:32,467 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2022-11-03 02:12:32,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2022-11-03 02:12:32,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 30 states have (on average 1.0333333333333334) internal successors, (31), 30 states have internal predecessors, (31), 13 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2022-11-03 02:12:32,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 56 transitions. [2022-11-03 02:12:32,484 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 56 transitions. Word has length 73 [2022-11-03 02:12:32,484 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:12:32,484 INFO L495 AbstractCegarLoop]: Abstraction has 47 states and 56 transitions. [2022-11-03 02:12:32,485 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 12 states have internal predecessors, (25), 10 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (11), 10 states have call predecessors, (11), 10 states have call successors, (11) [2022-11-03 02:12:32,485 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 56 transitions. [2022-11-03 02:12:32,486 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2022-11-03 02:12:32,486 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:12:32,487 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 9, 9, 9, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:12:32,500 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-03 02:12:32,694 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-03 02:12:32,695 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:12:32,695 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:12:32,695 INFO L85 PathProgramCache]: Analyzing trace with hash 1086423487, now seen corresponding path program 8 times [2022-11-03 02:12:32,696 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:12:32,696 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1980486531] [2022-11-03 02:12:32,696 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:12:32,696 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:12:32,709 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:12:32,709 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [933041397] [2022-11-03 02:12:32,709 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:12:32,709 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:12:32,710 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:12:32,720 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:12:32,721 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-03 02:12:33,872 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2022-11-03 02:12:33,872 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:12:33,875 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 40 conjunts are in the unsatisfiable core [2022-11-03 02:12:33,877 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:12:34,151 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 20 proven. 108 refuted. 0 times theorem prover too weak. 182 trivial. 0 not checked. [2022-11-03 02:12:34,152 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:12:34,338 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:12:34,338 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1980486531] [2022-11-03 02:12:34,338 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:12:34,339 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [933041397] [2022-11-03 02:12:34,339 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [933041397] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:12:34,339 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1307574686] [2022-11-03 02:12:34,341 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-03 02:12:34,342 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:12:34,342 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:12:34,343 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:12:34,343 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:12:34,832 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-03 02:12:34,837 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 75 for LOIs [2022-11-03 02:12:34,865 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:12:35,933 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3282#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:12:35,933 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:12:35,933 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-03 02:12:35,933 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2022-11-03 02:12:35,933 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [971956486] [2022-11-03 02:12:35,933 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-03 02:12:35,934 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-03 02:12:35,934 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:12:35,935 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-03 02:12:35,935 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=672, Unknown=0, NotChecked=0, Total=756 [2022-11-03 02:12:35,935 INFO L87 Difference]: Start difference. First operand 47 states and 56 transitions. Second operand has 14 states, 13 states have (on average 2.076923076923077) internal successors, (27), 13 states have internal predecessors, (27), 11 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 11 states have call predecessors, (12), 11 states have call successors, (12) [2022-11-03 02:12:36,346 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:12:36,346 INFO L93 Difference]: Finished difference Result 56 states and 67 transitions. [2022-11-03 02:12:36,346 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-11-03 02:12:36,347 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 2.076923076923077) internal successors, (27), 13 states have internal predecessors, (27), 11 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 11 states have call predecessors, (12), 11 states have call successors, (12) Word has length 80 [2022-11-03 02:12:36,347 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:12:36,348 INFO L225 Difference]: With dead ends: 56 [2022-11-03 02:12:36,348 INFO L226 Difference]: Without dead ends: 50 [2022-11-03 02:12:36,349 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 147 SyntacticMatches, 4 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=94, Invalid=776, Unknown=0, NotChecked=0, Total=870 [2022-11-03 02:12:36,350 INFO L413 NwaCegarLoop]: 42 mSDtfsCounter, 2 mSDsluCounter, 259 mSDsCounter, 0 mSdLazyCounter, 397 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 287 SdHoareTripleChecker+Invalid, 398 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 397 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-03 02:12:36,350 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 287 Invalid, 398 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 397 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-03 02:12:36,351 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2022-11-03 02:12:36,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2022-11-03 02:12:36,367 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 32 states have (on average 1.03125) internal successors, (33), 32 states have internal predecessors, (33), 14 states have call successors, (14), 4 states have call predecessors, (14), 3 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2022-11-03 02:12:36,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 60 transitions. [2022-11-03 02:12:36,368 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 60 transitions. Word has length 80 [2022-11-03 02:12:36,369 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:12:36,369 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 60 transitions. [2022-11-03 02:12:36,369 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 2.076923076923077) internal successors, (27), 13 states have internal predecessors, (27), 11 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 11 states have call predecessors, (12), 11 states have call successors, (12) [2022-11-03 02:12:36,369 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 60 transitions. [2022-11-03 02:12:36,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2022-11-03 02:12:36,371 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:12:36,371 INFO L195 NwaCegarLoop]: trace histogram [12, 11, 11, 10, 10, 10, 9, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:12:36,380 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-03 02:12:36,580 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:12:36,580 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:12:36,581 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:12:36,581 INFO L85 PathProgramCache]: Analyzing trace with hash 1047587122, now seen corresponding path program 9 times [2022-11-03 02:12:36,581 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:12:36,581 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [354995205] [2022-11-03 02:12:36,581 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:12:36,582 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:12:36,596 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:12:36,596 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1482594999] [2022-11-03 02:12:36,596 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 02:12:36,596 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:12:36,597 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:12:36,598 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:12:36,610 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-03 02:12:36,683 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 02:12:36,683 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:12:36,685 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 44 conjunts are in the unsatisfiable core [2022-11-03 02:12:36,688 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:12:36,999 INFO L134 CoverageAnalysis]: Checked inductivity of 379 backedges. 22 proven. 135 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2022-11-03 02:12:36,999 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:12:37,265 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:12:37,266 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [354995205] [2022-11-03 02:12:37,266 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:12:37,267 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1482594999] [2022-11-03 02:12:37,267 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1482594999] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:12:37,267 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2077705284] [2022-11-03 02:12:37,272 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-03 02:12:37,272 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:12:37,273 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:12:37,274 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:12:37,274 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:12:37,752 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-03 02:12:37,756 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 75 for LOIs [2022-11-03 02:12:37,783 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:12:38,849 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3792#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:12:38,849 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:12:38,849 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-03 02:12:38,849 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2022-11-03 02:12:38,849 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [109947828] [2022-11-03 02:12:38,850 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-03 02:12:38,850 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-11-03 02:12:38,850 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:12:38,851 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-11-03 02:12:38,851 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=725, Unknown=0, NotChecked=0, Total=812 [2022-11-03 02:12:38,852 INFO L87 Difference]: Start difference. First operand 50 states and 60 transitions. Second operand has 15 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 14 states have internal predecessors, (29), 12 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (13), 12 states have call predecessors, (13), 12 states have call successors, (13) [2022-11-03 02:12:39,353 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:12:39,353 INFO L93 Difference]: Finished difference Result 59 states and 71 transitions. [2022-11-03 02:12:39,353 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-03 02:12:39,353 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 14 states have internal predecessors, (29), 12 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (13), 12 states have call predecessors, (13), 12 states have call successors, (13) Word has length 87 [2022-11-03 02:12:39,354 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:12:39,355 INFO L225 Difference]: With dead ends: 59 [2022-11-03 02:12:39,355 INFO L226 Difference]: Without dead ends: 53 [2022-11-03 02:12:39,356 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 160 SyntacticMatches, 4 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=97, Invalid=833, Unknown=0, NotChecked=0, Total=930 [2022-11-03 02:12:39,356 INFO L413 NwaCegarLoop]: 45 mSDtfsCounter, 2 mSDsluCounter, 294 mSDsCounter, 0 mSdLazyCounter, 468 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 324 SdHoareTripleChecker+Invalid, 469 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 468 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-03 02:12:39,357 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 324 Invalid, 469 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 468 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-03 02:12:39,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2022-11-03 02:12:39,371 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2022-11-03 02:12:39,372 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 34 states have (on average 1.0294117647058822) internal successors, (35), 34 states have internal predecessors, (35), 15 states have call successors, (15), 4 states have call predecessors, (15), 3 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2022-11-03 02:12:39,373 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 64 transitions. [2022-11-03 02:12:39,373 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 64 transitions. Word has length 87 [2022-11-03 02:12:39,374 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:12:39,374 INFO L495 AbstractCegarLoop]: Abstraction has 53 states and 64 transitions. [2022-11-03 02:12:39,374 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 14 states have internal predecessors, (29), 12 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (13), 12 states have call predecessors, (13), 12 states have call successors, (13) [2022-11-03 02:12:39,375 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 64 transitions. [2022-11-03 02:12:39,376 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2022-11-03 02:12:39,376 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:12:39,376 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 11, 11, 11, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:12:39,411 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-03 02:12:39,596 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-11-03 02:12:39,597 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:12:39,597 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:12:39,597 INFO L85 PathProgramCache]: Analyzing trace with hash -1860777377, now seen corresponding path program 10 times [2022-11-03 02:12:39,597 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:12:39,597 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [988854278] [2022-11-03 02:12:39,597 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:12:39,598 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:12:39,617 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:12:39,625 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [39637531] [2022-11-03 02:12:39,629 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 02:12:39,629 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:12:39,629 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:12:39,631 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:12:39,639 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-03 02:12:41,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:12:41,333 INFO L263 TraceCheckSpWp]: Trace formula consists of 248 conjuncts, 48 conjunts are in the unsatisfiable core [2022-11-03 02:12:41,336 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:12:41,697 INFO L134 CoverageAnalysis]: Checked inductivity of 455 backedges. 24 proven. 165 refuted. 0 times theorem prover too weak. 266 trivial. 0 not checked. [2022-11-03 02:12:41,697 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:12:41,912 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:12:41,913 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [988854278] [2022-11-03 02:12:41,913 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:12:41,913 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [39637531] [2022-11-03 02:12:41,913 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [39637531] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:12:41,913 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [142455406] [2022-11-03 02:12:41,915 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-03 02:12:41,916 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:12:41,916 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:12:41,916 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:12:41,916 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:12:42,406 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-03 02:12:42,410 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 75 for LOIs [2022-11-03 02:12:42,438 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:12:43,551 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4334#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:12:43,551 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:12:43,551 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-03 02:12:43,551 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2022-11-03 02:12:43,551 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [4805677] [2022-11-03 02:12:43,551 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-03 02:12:43,552 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-11-03 02:12:43,552 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:12:43,553 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-11-03 02:12:43,553 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=780, Unknown=0, NotChecked=0, Total=870 [2022-11-03 02:12:43,554 INFO L87 Difference]: Start difference. First operand 53 states and 64 transitions. Second operand has 16 states, 15 states have (on average 2.066666666666667) internal successors, (31), 15 states have internal predecessors, (31), 13 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (14), 13 states have call predecessors, (14), 13 states have call successors, (14) [2022-11-03 02:12:44,139 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:12:44,139 INFO L93 Difference]: Finished difference Result 62 states and 75 transitions. [2022-11-03 02:12:44,144 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-03 02:12:44,145 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 2.066666666666667) internal successors, (31), 15 states have internal predecessors, (31), 13 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (14), 13 states have call predecessors, (14), 13 states have call successors, (14) Word has length 94 [2022-11-03 02:12:44,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:12:44,146 INFO L225 Difference]: With dead ends: 62 [2022-11-03 02:12:44,146 INFO L226 Difference]: Without dead ends: 56 [2022-11-03 02:12:44,147 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 207 GetRequests, 173 SyntacticMatches, 4 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=100, Invalid=892, Unknown=0, NotChecked=0, Total=992 [2022-11-03 02:12:44,151 INFO L413 NwaCegarLoop]: 48 mSDtfsCounter, 2 mSDsluCounter, 331 mSDsCounter, 0 mSdLazyCounter, 545 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 363 SdHoareTripleChecker+Invalid, 546 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 545 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-03 02:12:44,151 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 363 Invalid, 546 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 545 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-03 02:12:44,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2022-11-03 02:12:44,171 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2022-11-03 02:12:44,172 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 36 states have (on average 1.0277777777777777) internal successors, (37), 36 states have internal predecessors, (37), 16 states have call successors, (16), 4 states have call predecessors, (16), 3 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2022-11-03 02:12:44,173 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 68 transitions. [2022-11-03 02:12:44,173 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 68 transitions. Word has length 94 [2022-11-03 02:12:44,174 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:12:44,174 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 68 transitions. [2022-11-03 02:12:44,174 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 2.066666666666667) internal successors, (31), 15 states have internal predecessors, (31), 13 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (14), 13 states have call predecessors, (14), 13 states have call successors, (14) [2022-11-03 02:12:44,175 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 68 transitions. [2022-11-03 02:12:44,176 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2022-11-03 02:12:44,176 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:12:44,177 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 12, 12, 12, 11, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:12:44,188 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2022-11-03 02:12:44,385 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:12:44,386 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:12:44,386 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:12:44,386 INFO L85 PathProgramCache]: Analyzing trace with hash 366390418, now seen corresponding path program 11 times [2022-11-03 02:12:44,386 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:12:44,386 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [721256463] [2022-11-03 02:12:44,386 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:12:44,386 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:12:44,413 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:12:44,417 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1102867652] [2022-11-03 02:12:44,417 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:12:44,418 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:12:44,418 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:12:44,419 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:12:44,444 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-03 02:15:46,562 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2022-11-03 02:15:46,562 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:15:46,592 INFO L263 TraceCheckSpWp]: Trace formula consists of 265 conjuncts, 52 conjunts are in the unsatisfiable core [2022-11-03 02:15:46,595 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:15:47,009 INFO L134 CoverageAnalysis]: Checked inductivity of 538 backedges. 26 proven. 198 refuted. 0 times theorem prover too weak. 314 trivial. 0 not checked. [2022-11-03 02:15:47,010 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:15:47,341 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:15:47,341 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [721256463] [2022-11-03 02:15:47,341 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:15:47,341 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1102867652] [2022-11-03 02:15:47,342 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1102867652] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:15:47,342 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1036059695] [2022-11-03 02:15:47,344 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-03 02:15:47,344 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:15:47,344 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:15:47,344 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:15:47,345 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:15:47,886 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-03 02:15:47,891 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 75 for LOIs [2022-11-03 02:15:47,920 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:15:49,079 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4908#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:15:49,079 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:15:49,079 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-03 02:15:49,079 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2022-11-03 02:15:49,080 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [464968728] [2022-11-03 02:15:49,080 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-03 02:15:49,081 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-11-03 02:15:49,081 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:15:49,081 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-11-03 02:15:49,082 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=837, Unknown=0, NotChecked=0, Total=930 [2022-11-03 02:15:49,082 INFO L87 Difference]: Start difference. First operand 56 states and 68 transitions. Second operand has 17 states, 16 states have (on average 2.0625) internal successors, (33), 16 states have internal predecessors, (33), 14 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (15), 14 states have call predecessors, (15), 14 states have call successors, (15) [2022-11-03 02:15:49,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:15:49,795 INFO L93 Difference]: Finished difference Result 65 states and 79 transitions. [2022-11-03 02:15:49,795 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-11-03 02:15:49,796 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 2.0625) internal successors, (33), 16 states have internal predecessors, (33), 14 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (15), 14 states have call predecessors, (15), 14 states have call successors, (15) Word has length 101 [2022-11-03 02:15:49,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:15:49,797 INFO L225 Difference]: With dead ends: 65 [2022-11-03 02:15:49,797 INFO L226 Difference]: Without dead ends: 59 [2022-11-03 02:15:49,798 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 221 GetRequests, 186 SyntacticMatches, 4 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=103, Invalid=953, Unknown=0, NotChecked=0, Total=1056 [2022-11-03 02:15:49,799 INFO L413 NwaCegarLoop]: 51 mSDtfsCounter, 2 mSDsluCounter, 370 mSDsCounter, 0 mSdLazyCounter, 628 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 404 SdHoareTripleChecker+Invalid, 629 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 628 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-03 02:15:49,800 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 404 Invalid, 629 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 628 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-03 02:15:49,800 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2022-11-03 02:15:49,820 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2022-11-03 02:15:49,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 38 states have (on average 1.0263157894736843) internal successors, (39), 38 states have internal predecessors, (39), 17 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2022-11-03 02:15:49,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 72 transitions. [2022-11-03 02:15:49,821 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 72 transitions. Word has length 101 [2022-11-03 02:15:49,822 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:15:49,822 INFO L495 AbstractCegarLoop]: Abstraction has 59 states and 72 transitions. [2022-11-03 02:15:49,822 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 2.0625) internal successors, (33), 16 states have internal predecessors, (33), 14 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (15), 14 states have call predecessors, (15), 14 states have call successors, (15) [2022-11-03 02:15:49,822 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 72 transitions. [2022-11-03 02:15:49,824 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2022-11-03 02:15:49,824 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:15:49,824 INFO L195 NwaCegarLoop]: trace histogram [15, 14, 14, 13, 13, 13, 12, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:15:49,845 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-11-03 02:15:50,025 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:15:50,025 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:15:50,025 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:15:50,026 INFO L85 PathProgramCache]: Analyzing trace with hash 129006335, now seen corresponding path program 12 times [2022-11-03 02:15:50,026 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:15:50,026 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [252063486] [2022-11-03 02:15:50,026 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:15:50,026 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:15:50,037 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:15:50,037 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1783437739] [2022-11-03 02:15:50,037 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 02:15:50,038 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:15:50,038 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:15:50,039 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:15:50,046 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-03 02:15:50,119 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 02:15:50,120 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:15:50,122 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 57 conjunts are in the unsatisfiable core [2022-11-03 02:15:50,124 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:15:50,662 INFO L134 CoverageAnalysis]: Checked inductivity of 628 backedges. 28 proven. 234 refuted. 0 times theorem prover too weak. 366 trivial. 0 not checked. [2022-11-03 02:15:50,662 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:15:52,057 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:15:52,057 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [252063486] [2022-11-03 02:15:52,057 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:15:52,058 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1783437739] [2022-11-03 02:15:52,058 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1783437739] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:15:52,058 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1085124983] [2022-11-03 02:15:52,060 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-03 02:15:52,060 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:15:52,061 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:15:52,061 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:15:52,061 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:15:52,578 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-03 02:15:52,583 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 75 for LOIs [2022-11-03 02:15:52,611 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:15:54,138 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5756#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:15:54,138 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:15:54,138 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-03 02:15:54,138 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2022-11-03 02:15:54,138 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1593737555] [2022-11-03 02:15:54,139 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-03 02:15:54,139 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-11-03 02:15:54,139 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:15:54,140 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-11-03 02:15:54,140 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=262, Invalid=1544, Unknown=0, NotChecked=0, Total=1806 [2022-11-03 02:15:54,140 INFO L87 Difference]: Start difference. First operand 59 states and 72 transitions. Second operand has 18 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 15 states have call successors, (17), 2 states have call predecessors, (17), 1 states have return successors, (16), 15 states have call predecessors, (16), 15 states have call successors, (16) [2022-11-03 02:15:55,001 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:15:55,001 INFO L93 Difference]: Finished difference Result 68 states and 83 transitions. [2022-11-03 02:15:55,001 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-03 02:15:55,002 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 15 states have call successors, (17), 2 states have call predecessors, (17), 1 states have return successors, (16), 15 states have call predecessors, (16), 15 states have call successors, (16) Word has length 108 [2022-11-03 02:15:55,002 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:15:55,003 INFO L225 Difference]: With dead ends: 68 [2022-11-03 02:15:55,003 INFO L226 Difference]: Without dead ends: 62 [2022-11-03 02:15:55,004 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 312 GetRequests, 265 SyntacticMatches, 4 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 252 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=272, Invalid=1708, Unknown=0, NotChecked=0, Total=1980 [2022-11-03 02:15:55,005 INFO L413 NwaCegarLoop]: 54 mSDtfsCounter, 2 mSDsluCounter, 389 mSDsCounter, 0 mSdLazyCounter, 739 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 425 SdHoareTripleChecker+Invalid, 740 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 739 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-03 02:15:55,005 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 425 Invalid, 740 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 739 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-03 02:15:55,006 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2022-11-03 02:15:55,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 62. [2022-11-03 02:15:55,035 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 40 states have (on average 1.025) internal successors, (41), 40 states have internal predecessors, (41), 18 states have call successors, (18), 4 states have call predecessors, (18), 3 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) [2022-11-03 02:15:55,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 76 transitions. [2022-11-03 02:15:55,040 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 76 transitions. Word has length 108 [2022-11-03 02:15:55,041 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:15:55,041 INFO L495 AbstractCegarLoop]: Abstraction has 62 states and 76 transitions. [2022-11-03 02:15:55,042 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 15 states have call successors, (17), 2 states have call predecessors, (17), 1 states have return successors, (16), 15 states have call predecessors, (16), 15 states have call successors, (16) [2022-11-03 02:15:55,042 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 76 transitions. [2022-11-03 02:15:55,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2022-11-03 02:15:55,044 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:15:55,044 INFO L195 NwaCegarLoop]: trace histogram [16, 15, 15, 14, 14, 14, 13, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:15:55,096 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-11-03 02:15:55,268 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-11-03 02:15:55,269 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:15:55,269 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:15:55,269 INFO L85 PathProgramCache]: Analyzing trace with hash 1823672306, now seen corresponding path program 13 times [2022-11-03 02:15:55,269 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:15:55,269 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1860876008] [2022-11-03 02:15:55,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:15:55,270 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:15:55,284 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:15:55,284 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [966326682] [2022-11-03 02:15:55,285 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 02:15:55,285 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:15:55,285 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:15:55,286 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:15:55,289 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-03 02:15:57,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:15:57,452 INFO L263 TraceCheckSpWp]: Trace formula consists of 299 conjuncts, 61 conjunts are in the unsatisfiable core [2022-11-03 02:15:57,454 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:15:57,951 INFO L134 CoverageAnalysis]: Checked inductivity of 725 backedges. 30 proven. 273 refuted. 0 times theorem prover too weak. 422 trivial. 0 not checked. [2022-11-03 02:15:57,951 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:15:59,331 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:15:59,331 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1860876008] [2022-11-03 02:15:59,332 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:15:59,332 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [966326682] [2022-11-03 02:15:59,332 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [966326682] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:15:59,332 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1893693685] [2022-11-03 02:15:59,334 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-03 02:15:59,334 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:15:59,334 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:15:59,335 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:15:59,335 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:15:59,759 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-03 02:15:59,763 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 75 for LOIs [2022-11-03 02:15:59,784 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:16:01,128 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6658#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:16:01,129 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:16:01,129 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-03 02:16:01,129 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2022-11-03 02:16:01,129 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1076662497] [2022-11-03 02:16:01,129 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-03 02:16:01,130 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-11-03 02:16:01,130 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:16:01,130 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-11-03 02:16:01,131 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=292, Invalid=1688, Unknown=0, NotChecked=0, Total=1980 [2022-11-03 02:16:01,132 INFO L87 Difference]: Start difference. First operand 62 states and 76 transitions. Second operand has 19 states, 18 states have (on average 2.0555555555555554) internal successors, (37), 18 states have internal predecessors, (37), 16 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (17), 16 states have call predecessors, (17), 16 states have call successors, (17) [2022-11-03 02:16:02,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:16:02,109 INFO L93 Difference]: Finished difference Result 71 states and 87 transitions. [2022-11-03 02:16:02,109 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-11-03 02:16:02,110 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 2.0555555555555554) internal successors, (37), 18 states have internal predecessors, (37), 16 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (17), 16 states have call predecessors, (17), 16 states have call successors, (17) Word has length 115 [2022-11-03 02:16:02,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:16:02,111 INFO L225 Difference]: With dead ends: 71 [2022-11-03 02:16:02,111 INFO L226 Difference]: Without dead ends: 65 [2022-11-03 02:16:02,112 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 333 GetRequests, 284 SyntacticMatches, 4 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 267 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=302, Invalid=1860, Unknown=0, NotChecked=0, Total=2162 [2022-11-03 02:16:02,112 INFO L413 NwaCegarLoop]: 57 mSDtfsCounter, 2 mSDsluCounter, 430 mSDsCounter, 0 mSdLazyCounter, 836 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 468 SdHoareTripleChecker+Invalid, 837 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 836 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-03 02:16:02,113 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 468 Invalid, 837 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 836 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-03 02:16:02,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2022-11-03 02:16:02,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2022-11-03 02:16:02,148 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 42 states have (on average 1.0238095238095237) internal successors, (43), 42 states have internal predecessors, (43), 19 states have call successors, (19), 4 states have call predecessors, (19), 3 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) [2022-11-03 02:16:02,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 80 transitions. [2022-11-03 02:16:02,151 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 80 transitions. Word has length 115 [2022-11-03 02:16:02,154 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:16:02,155 INFO L495 AbstractCegarLoop]: Abstraction has 65 states and 80 transitions. [2022-11-03 02:16:02,155 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 18 states have (on average 2.0555555555555554) internal successors, (37), 18 states have internal predecessors, (37), 16 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (17), 16 states have call predecessors, (17), 16 states have call successors, (17) [2022-11-03 02:16:02,155 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 80 transitions. [2022-11-03 02:16:02,157 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2022-11-03 02:16:02,157 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:16:02,157 INFO L195 NwaCegarLoop]: trace histogram [17, 16, 16, 15, 15, 15, 14, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:16:02,172 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-11-03 02:16:02,366 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-11-03 02:16:02,367 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:16:02,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:16:02,368 INFO L85 PathProgramCache]: Analyzing trace with hash -2135387233, now seen corresponding path program 14 times [2022-11-03 02:16:02,368 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:16:02,368 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [268302698] [2022-11-03 02:16:02,368 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:16:02,369 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:16:02,400 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:16:02,401 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [426575764] [2022-11-03 02:16:02,402 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:16:02,402 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:16:02,402 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:16:02,403 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:16:02,428 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_560af2ed-cdcb-45f1-adce-67add8291a84/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process