./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/divbin2_valuebound10.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 4e7fbc69 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_cda00219-eff2-40be-9605-6471dc1b3c2a/bin/utaipan-Q6hlc19bkW/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cda00219-eff2-40be-9605-6471dc1b3c2a/bin/utaipan-Q6hlc19bkW/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cda00219-eff2-40be-9605-6471dc1b3c2a/bin/utaipan-Q6hlc19bkW/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cda00219-eff2-40be-9605-6471dc1b3c2a/bin/utaipan-Q6hlc19bkW/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/divbin2_valuebound10.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cda00219-eff2-40be-9605-6471dc1b3c2a/bin/utaipan-Q6hlc19bkW/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cda00219-eff2-40be-9605-6471dc1b3c2a/bin/utaipan-Q6hlc19bkW --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 5d6ad2c11d3a75b8845224ed23d407062e615cc5bd2b5ad3e6646436a3e13805 --- 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-4e7fbc6 [2022-11-23 14:49:15,964 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-23 14:49:15,967 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-23 14:49:16,012 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-23 14:49:16,013 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-23 14:49:16,017 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-23 14:49:16,019 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-23 14:49:16,020 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-23 14:49:16,023 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-23 14:49:16,029 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-23 14:49:16,030 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-23 14:49:16,031 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-23 14:49:16,032 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-23 14:49:16,033 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-23 14:49:16,034 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-23 14:49:16,035 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-23 14:49:16,036 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-23 14:49:16,040 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-23 14:49:16,043 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-23 14:49:16,050 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-23 14:49:16,054 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-23 14:49:16,057 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-23 14:49:16,059 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-23 14:49:16,060 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-23 14:49:16,071 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-23 14:49:16,071 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-23 14:49:16,072 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-23 14:49:16,074 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-23 14:49:16,074 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-23 14:49:16,075 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-23 14:49:16,075 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-23 14:49:16,076 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-23 14:49:16,078 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-23 14:49:16,079 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-23 14:49:16,081 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-23 14:49:16,082 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-23 14:49:16,083 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-23 14:49:16,084 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-23 14:49:16,084 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-23 14:49:16,085 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-23 14:49:16,086 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-23 14:49:16,087 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cda00219-eff2-40be-9605-6471dc1b3c2a/bin/utaipan-Q6hlc19bkW/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-23 14:49:16,126 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-23 14:49:16,127 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-23 14:49:16,127 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-23 14:49:16,127 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-23 14:49:16,128 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-23 14:49:16,129 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-23 14:49:16,129 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-23 14:49:16,129 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-23 14:49:16,129 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-23 14:49:16,129 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-23 14:49:16,130 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-23 14:49:16,131 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-23 14:49:16,131 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-23 14:49:16,131 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-23 14:49:16,131 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-23 14:49:16,132 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-23 14:49:16,132 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-23 14:49:16,132 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-23 14:49:16,133 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-23 14:49:16,133 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-23 14:49:16,134 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-23 14:49:16,134 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-23 14:49:16,134 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-23 14:49:16,134 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-23 14:49:16,135 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-23 14:49:16,135 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-23 14:49:16,135 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-23 14:49:16,135 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-23 14:49:16,135 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-23 14:49:16,136 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-23 14:49:16,136 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-23 14:49:16,136 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-23 14:49:16,136 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-23 14:49:16,137 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-23 14:49:16,137 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-23 14:49:16,137 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-23 14:49:16,137 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-23 14:49:16,137 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-23 14:49:16,138 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-23 14:49:16,138 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-23 14:49:16,138 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-23 14:49:16,138 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_cda00219-eff2-40be-9605-6471dc1b3c2a/bin/utaipan-Q6hlc19bkW/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cda00219-eff2-40be-9605-6471dc1b3c2a/bin/utaipan-Q6hlc19bkW Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 5d6ad2c11d3a75b8845224ed23d407062e615cc5bd2b5ad3e6646436a3e13805 [2022-11-23 14:49:16,515 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-23 14:49:16,544 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-23 14:49:16,547 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-23 14:49:16,549 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-23 14:49:16,549 INFO L275 PluginConnector]: CDTParser initialized [2022-11-23 14:49:16,551 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cda00219-eff2-40be-9605-6471dc1b3c2a/bin/utaipan-Q6hlc19bkW/../../sv-benchmarks/c/nla-digbench-scaling/divbin2_valuebound10.i [2022-11-23 14:49:19,740 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-23 14:49:20,012 INFO L351 CDTParser]: Found 1 translation units. [2022-11-23 14:49:20,013 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cda00219-eff2-40be-9605-6471dc1b3c2a/sv-benchmarks/c/nla-digbench-scaling/divbin2_valuebound10.i [2022-11-23 14:49:20,022 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cda00219-eff2-40be-9605-6471dc1b3c2a/bin/utaipan-Q6hlc19bkW/data/d85b67adb/ec6ca2309ff34d2c94cd3ca1bec37f37/FLAGb009ca7ef [2022-11-23 14:49:20,044 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cda00219-eff2-40be-9605-6471dc1b3c2a/bin/utaipan-Q6hlc19bkW/data/d85b67adb/ec6ca2309ff34d2c94cd3ca1bec37f37 [2022-11-23 14:49:20,047 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-23 14:49:20,048 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-23 14:49:20,050 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-23 14:49:20,050 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-23 14:49:20,055 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-23 14:49:20,056 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:49:20" (1/1) ... [2022-11-23 14:49:20,057 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@68b74fc2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:49:20, skipping insertion in model container [2022-11-23 14:49:20,057 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:49:20" (1/1) ... [2022-11-23 14:49:20,066 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-23 14:49:20,085 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-23 14:49:20,263 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cda00219-eff2-40be-9605-6471dc1b3c2a/sv-benchmarks/c/nla-digbench-scaling/divbin2_valuebound10.i[951,964] [2022-11-23 14:49:20,279 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-23 14:49:20,289 INFO L203 MainTranslator]: Completed pre-run [2022-11-23 14:49:20,301 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cda00219-eff2-40be-9605-6471dc1b3c2a/sv-benchmarks/c/nla-digbench-scaling/divbin2_valuebound10.i[951,964] [2022-11-23 14:49:20,307 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-23 14:49:20,323 INFO L208 MainTranslator]: Completed translation [2022-11-23 14:49:20,324 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:49:20 WrapperNode [2022-11-23 14:49:20,324 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-23 14:49:20,325 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-23 14:49:20,325 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-23 14:49:20,325 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-23 14:49:20,332 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:49:20" (1/1) ... [2022-11-23 14:49:20,341 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:49:20" (1/1) ... [2022-11-23 14:49:20,361 INFO L138 Inliner]: procedures = 16, calls = 9, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 46 [2022-11-23 14:49:20,362 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-23 14:49:20,363 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-23 14:49:20,363 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-23 14:49:20,363 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-23 14:49:20,373 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:49:20" (1/1) ... [2022-11-23 14:49:20,373 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:49:20" (1/1) ... [2022-11-23 14:49:20,375 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:49:20" (1/1) ... [2022-11-23 14:49:20,375 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:49:20" (1/1) ... [2022-11-23 14:49:20,378 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:49:20" (1/1) ... [2022-11-23 14:49:20,383 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:49:20" (1/1) ... [2022-11-23 14:49:20,384 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:49:20" (1/1) ... [2022-11-23 14:49:20,385 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:49:20" (1/1) ... [2022-11-23 14:49:20,387 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-23 14:49:20,388 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-23 14:49:20,388 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-23 14:49:20,388 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-23 14:49:20,389 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:49:20" (1/1) ... [2022-11-23 14:49:20,396 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-23 14:49:20,411 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cda00219-eff2-40be-9605-6471dc1b3c2a/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:49:20,427 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cda00219-eff2-40be-9605-6471dc1b3c2a/bin/utaipan-Q6hlc19bkW/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-23 14:49:20,461 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cda00219-eff2-40be-9605-6471dc1b3c2a/bin/utaipan-Q6hlc19bkW/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-23 14:49:20,485 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-23 14:49:20,485 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-23 14:49:20,485 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-23 14:49:20,486 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-23 14:49:20,486 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-11-23 14:49:20,486 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-11-23 14:49:20,578 INFO L235 CfgBuilder]: Building ICFG [2022-11-23 14:49:20,581 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-23 14:49:20,727 INFO L276 CfgBuilder]: Performing block encoding [2022-11-23 14:49:20,786 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-23 14:49:20,786 INFO L300 CfgBuilder]: Removed 2 assume(true) statements. [2022-11-23 14:49:20,789 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:49:20 BoogieIcfgContainer [2022-11-23 14:49:20,789 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-23 14:49:20,792 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-23 14:49:20,793 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-23 14:49:20,796 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-23 14:49:20,796 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 02:49:20" (1/3) ... [2022-11-23 14:49:20,797 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@67ea126e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:49:20, skipping insertion in model container [2022-11-23 14:49:20,797 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:49:20" (2/3) ... [2022-11-23 14:49:20,798 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@67ea126e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:49:20, skipping insertion in model container [2022-11-23 14:49:20,798 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:49:20" (3/3) ... [2022-11-23 14:49:20,799 INFO L112 eAbstractionObserver]: Analyzing ICFG divbin2_valuebound10.i [2022-11-23 14:49:20,821 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-23 14:49:20,822 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-23 14:49:20,908 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-23 14:49:20,919 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;@33a11efd, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-23 14:49:20,920 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-23 14:49:20,925 INFO L276 IsEmpty]: Start isEmpty. Operand has 15 states, 10 states have (on average 1.6) internal successors, (16), 11 states have internal predecessors, (16), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-23 14:49:20,938 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-11-23 14:49:20,938 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:49:20,939 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:49:20,939 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:49:20,947 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:49:20,949 INFO L85 PathProgramCache]: Analyzing trace with hash 1881233236, now seen corresponding path program 1 times [2022-11-23 14:49:20,963 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:49:20,963 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [805168435] [2022-11-23 14:49:20,964 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:49:20,964 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:49:21,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:49:21,152 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:49:21,152 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [805168435] [2022-11-23 14:49:21,153 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unsupported non-linear arithmetic [2022-11-23 14:49:21,153 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [785567663] [2022-11-23 14:49:21,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:49:21,154 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:49:21,154 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cda00219-eff2-40be-9605-6471dc1b3c2a/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:49:21,162 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cda00219-eff2-40be-9605-6471dc1b3c2a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:49:21,166 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cda00219-eff2-40be-9605-6471dc1b3c2a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-23 14:49:21,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:49:21,242 INFO L263 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 1 conjunts are in the unsatisfiable core [2022-11-23 14:49:21,246 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:49:21,271 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:49:21,271 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 14:49:21,272 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [785567663] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:49:21,272 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 14:49:21,272 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-23 14:49:21,274 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [669957226] [2022-11-23 14:49:21,275 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:49:21,280 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-11-23 14:49:21,281 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:49:21,311 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-11-23 14:49:21,312 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-23 14:49:21,314 INFO L87 Difference]: Start difference. First operand has 15 states, 10 states have (on average 1.6) internal successors, (16), 11 states have internal predecessors, (16), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:49:21,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:49:21,348 INFO L93 Difference]: Finished difference Result 27 states and 37 transitions. [2022-11-23 14:49:21,350 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-11-23 14:49:21,351 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2022-11-23 14:49:21,352 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:49:21,360 INFO L225 Difference]: With dead ends: 27 [2022-11-23 14:49:21,360 INFO L226 Difference]: Without dead ends: 13 [2022-11-23 14:49:21,364 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-23 14:49:21,368 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 4 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-23 14:49:21,369 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 14 Invalid, 4 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-23 14:49:21,389 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2022-11-23 14:49:21,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2022-11-23 14:49:21,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 10 states have internal predecessors, (12), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-23 14:49:21,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 15 transitions. [2022-11-23 14:49:21,424 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 15 transitions. Word has length 7 [2022-11-23 14:49:21,424 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:49:21,425 INFO L495 AbstractCegarLoop]: Abstraction has 13 states and 15 transitions. [2022-11-23 14:49:21,425 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:49:21,425 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 15 transitions. [2022-11-23 14:49:21,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-11-23 14:49:21,426 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:49:21,426 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:49:21,446 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cda00219-eff2-40be-9605-6471dc1b3c2a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-23 14:49:21,638 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cda00219-eff2-40be-9605-6471dc1b3c2a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2022-11-23 14:49:21,638 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:49:21,639 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:49:21,639 INFO L85 PathProgramCache]: Analyzing trace with hash -515868340, now seen corresponding path program 1 times [2022-11-23 14:49:21,640 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:49:21,640 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1337326578] [2022-11-23 14:49:21,640 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:49:21,640 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:49:21,658 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:49:21,658 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1426548405] [2022-11-23 14:49:21,658 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:49:21,659 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:49:21,659 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cda00219-eff2-40be-9605-6471dc1b3c2a/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:49:21,660 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cda00219-eff2-40be-9605-6471dc1b3c2a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:49:21,685 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cda00219-eff2-40be-9605-6471dc1b3c2a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-23 14:49:21,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:49:21,743 INFO L263 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-23 14:49:21,750 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:49:22,067 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:49:22,067 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 14:49:22,068 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:49:22,068 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1337326578] [2022-11-23 14:49:22,068 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:49:22,068 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1426548405] [2022-11-23 14:49:22,069 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1426548405] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:49:22,069 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 14:49:22,069 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-23 14:49:22,069 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2025861154] [2022-11-23 14:49:22,070 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:49:22,071 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-23 14:49:22,071 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:49:22,072 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-23 14:49:22,072 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-11-23 14:49:22,073 INFO L87 Difference]: Start difference. First operand 13 states and 15 transitions. Second operand has 6 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:49:22,164 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:49:22,164 INFO L93 Difference]: Finished difference Result 25 states and 29 transitions. [2022-11-23 14:49:22,165 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-23 14:49:22,165 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2022-11-23 14:49:22,166 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:49:22,166 INFO L225 Difference]: With dead ends: 25 [2022-11-23 14:49:22,166 INFO L226 Difference]: Without dead ends: 22 [2022-11-23 14:49:22,167 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2022-11-23 14:49:22,169 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 8 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:49:22,170 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 32 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 45 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 14:49:22,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2022-11-23 14:49:22,178 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2022-11-23 14:49:22,179 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 16 states have (on average 1.25) internal successors, (20), 17 states have internal predecessors, (20), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-23 14:49:22,180 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 25 transitions. [2022-11-23 14:49:22,181 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 25 transitions. Word has length 8 [2022-11-23 14:49:22,181 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:49:22,181 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 25 transitions. [2022-11-23 14:49:22,182 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:49:22,182 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 25 transitions. [2022-11-23 14:49:22,183 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-11-23 14:49:22,183 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:49:22,183 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:49:22,196 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cda00219-eff2-40be-9605-6471dc1b3c2a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-23 14:49:22,390 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cda00219-eff2-40be-9605-6471dc1b3c2a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:49:22,391 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:49:22,391 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:49:22,393 INFO L85 PathProgramCache]: Analyzing trace with hash -965242393, now seen corresponding path program 1 times [2022-11-23 14:49:22,393 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:49:22,394 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1231935879] [2022-11-23 14:49:22,394 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:49:22,395 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:49:22,428 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:49:22,429 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1848907199] [2022-11-23 14:49:22,429 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:49:22,430 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:49:22,430 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cda00219-eff2-40be-9605-6471dc1b3c2a/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:49:22,433 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cda00219-eff2-40be-9605-6471dc1b3c2a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:49:22,461 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cda00219-eff2-40be-9605-6471dc1b3c2a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-23 14:49:22,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:49:22,505 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-23 14:49:22,508 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:49:22,704 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:49:22,704 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:49:22,944 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:49:22,944 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:49:22,945 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1231935879] [2022-11-23 14:49:22,945 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:49:22,945 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1848907199] [2022-11-23 14:49:22,945 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1848907199] provided 1 perfect and 1 imperfect interpolant sequences [2022-11-23 14:49:22,946 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-23 14:49:22,946 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [5] total 9 [2022-11-23 14:49:22,946 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [239471073] [2022-11-23 14:49:22,947 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:49:22,947 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-23 14:49:22,947 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:49:22,948 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-23 14:49:22,948 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2022-11-23 14:49:22,949 INFO L87 Difference]: Start difference. First operand 22 states and 25 transitions. Second operand has 6 states, 6 states have (on average 1.5) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:49:26,336 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [1] [2022-11-23 14:49:26,365 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:49:26,365 INFO L93 Difference]: Finished difference Result 32 states and 36 transitions. [2022-11-23 14:49:26,368 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-23 14:49:26,368 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.5) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2022-11-23 14:49:26,369 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:49:26,369 INFO L225 Difference]: With dead ends: 32 [2022-11-23 14:49:26,370 INFO L226 Difference]: Without dead ends: 30 [2022-11-23 14:49:26,370 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2022-11-23 14:49:26,372 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 10 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 2 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.4s IncrementalHoareTripleChecker+Time [2022-11-23 14:49:26,373 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 33 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 34 Invalid, 1 Unknown, 0 Unchecked, 3.4s Time] [2022-11-23 14:49:26,374 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2022-11-23 14:49:26,384 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 28. [2022-11-23 14:49:26,384 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 20 states have (on average 1.2) internal successors, (24), 22 states have internal predecessors, (24), 4 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-23 14:49:26,385 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 31 transitions. [2022-11-23 14:49:26,386 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 31 transitions. Word has length 10 [2022-11-23 14:49:26,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:49:26,386 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 31 transitions. [2022-11-23 14:49:26,386 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.5) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:49:26,387 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 31 transitions. [2022-11-23 14:49:26,387 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-11-23 14:49:26,387 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:49:26,388 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:49:26,393 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cda00219-eff2-40be-9605-6471dc1b3c2a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-23 14:49:26,588 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cda00219-eff2-40be-9605-6471dc1b3c2a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:49:26,589 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:49:26,589 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:49:26,589 INFO L85 PathProgramCache]: Analyzing trace with hash -969972797, now seen corresponding path program 1 times [2022-11-23 14:49:26,590 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:49:26,590 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1177117453] [2022-11-23 14:49:26,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:49:26,590 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:49:26,607 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:49:26,609 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [402800546] [2022-11-23 14:49:26,610 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:49:26,610 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:49:26,611 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cda00219-eff2-40be-9605-6471dc1b3c2a/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:49:26,613 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cda00219-eff2-40be-9605-6471dc1b3c2a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:49:26,619 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cda00219-eff2-40be-9605-6471dc1b3c2a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-23 14:49:26,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:49:26,670 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 5 conjunts are in the unsatisfiable core [2022-11-23 14:49:26,671 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:49:26,711 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:49:26,711 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 14:49:26,712 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:49:26,712 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1177117453] [2022-11-23 14:49:26,712 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:49:26,713 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [402800546] [2022-11-23 14:49:26,713 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [402800546] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:49:26,713 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 14:49:26,713 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-23 14:49:26,714 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1346770931] [2022-11-23 14:49:26,714 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:49:26,714 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-23 14:49:26,715 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:49:26,715 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-23 14:49:26,716 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-23 14:49:26,716 INFO L87 Difference]: Start difference. First operand 28 states and 31 transitions. Second operand has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-23 14:49:26,750 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:49:26,751 INFO L93 Difference]: Finished difference Result 38 states and 42 transitions. [2022-11-23 14:49:26,751 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-23 14:49:26,752 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2022-11-23 14:49:26,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:49:26,754 INFO L225 Difference]: With dead ends: 38 [2022-11-23 14:49:26,755 INFO L226 Difference]: Without dead ends: 21 [2022-11-23 14:49:26,755 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-23 14:49:26,757 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 10 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 10 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-23 14:49:26,757 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 20 Invalid, 10 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 10 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-23 14:49:26,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2022-11-23 14:49:26,766 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2022-11-23 14:49:26,766 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 15 states have (on average 1.2) internal successors, (18), 17 states have internal predecessors, (18), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-23 14:49:26,767 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2022-11-23 14:49:26,767 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 15 [2022-11-23 14:49:26,768 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:49:26,768 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2022-11-23 14:49:26,768 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-23 14:49:26,768 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2022-11-23 14:49:26,769 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-11-23 14:49:26,769 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:49:26,769 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:49:26,778 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cda00219-eff2-40be-9605-6471dc1b3c2a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-23 14:49:26,970 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cda00219-eff2-40be-9605-6471dc1b3c2a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:49:26,970 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:49:26,971 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:49:26,971 INFO L85 PathProgramCache]: Analyzing trace with hash 2029469439, now seen corresponding path program 1 times [2022-11-23 14:49:26,971 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:49:26,971 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [929061923] [2022-11-23 14:49:26,971 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:49:26,971 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:49:26,986 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:49:26,986 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [119970867] [2022-11-23 14:49:26,986 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:49:26,987 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:49:26,987 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cda00219-eff2-40be-9605-6471dc1b3c2a/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:49:26,988 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cda00219-eff2-40be-9605-6471dc1b3c2a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:49:27,030 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cda00219-eff2-40be-9605-6471dc1b3c2a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-23 14:49:27,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:49:27,062 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-23 14:49:27,064 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:49:27,145 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-23 14:49:27,146 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:49:27,310 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-23 14:49:27,310 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:49:27,310 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [929061923] [2022-11-23 14:49:27,310 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:49:27,311 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [119970867] [2022-11-23 14:49:27,311 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [119970867] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:49:27,311 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [60222117] [2022-11-23 14:49:27,378 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-23 14:49:27,409 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:49:27,419 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:49:27,428 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:49:27,432 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:49:27,825 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 43 for LOIs [2022-11-23 14:49:27,949 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:49:28,982 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '568#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:49:28,982 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:49:28,982 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:49:28,982 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 9 [2022-11-23 14:49:28,982 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [307093] [2022-11-23 14:49:28,983 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 14:49:28,983 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-11-23 14:49:28,983 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:49:28,984 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-11-23 14:49:28,984 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=244, Unknown=0, NotChecked=0, Total=306 [2022-11-23 14:49:28,984 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand has 9 states, 9 states have (on average 1.7777777777777777) internal successors, (16), 8 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-23 14:49:31,300 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 14:49:31,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:49:31,361 INFO L93 Difference]: Finished difference Result 27 states and 28 transitions. [2022-11-23 14:49:31,362 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-23 14:49:31,362 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.7777777777777777) internal successors, (16), 8 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 16 [2022-11-23 14:49:31,362 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:49:31,363 INFO L225 Difference]: With dead ends: 27 [2022-11-23 14:49:31,363 INFO L226 Difference]: Without dead ends: 20 [2022-11-23 14:49:31,363 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=79, Invalid=301, Unknown=0, NotChecked=0, Total=380 [2022-11-23 14:49:31,364 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 11 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 3 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 60 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2022-11-23 14:49:31,365 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 36 Invalid, 60 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 56 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2022-11-23 14:49:31,369 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2022-11-23 14:49:31,374 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2022-11-23 14:49:31,376 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 16 states have internal predecessors, (17), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-23 14:49:31,377 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2022-11-23 14:49:31,378 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 16 [2022-11-23 14:49:31,378 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:49:31,379 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2022-11-23 14:49:31,379 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 1.7777777777777777) internal successors, (16), 8 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-23 14:49:31,379 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2022-11-23 14:49:31,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-11-23 14:49:31,381 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:49:31,381 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:49:31,394 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cda00219-eff2-40be-9605-6471dc1b3c2a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-23 14:49:31,588 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cda00219-eff2-40be-9605-6471dc1b3c2a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:49:31,588 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:49:31,589 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:49:31,589 INFO L85 PathProgramCache]: Analyzing trace with hash -425494840, now seen corresponding path program 1 times [2022-11-23 14:49:31,589 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:49:31,589 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [572516050] [2022-11-23 14:49:31,589 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:49:31,590 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:49:31,602 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:49:31,603 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1609078016] [2022-11-23 14:49:31,603 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:49:31,603 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:49:31,603 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cda00219-eff2-40be-9605-6471dc1b3c2a/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:49:31,605 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cda00219-eff2-40be-9605-6471dc1b3c2a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:49:31,626 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cda00219-eff2-40be-9605-6471dc1b3c2a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-23 14:49:31,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:49:31,696 INFO L263 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 21 conjunts are in the unsatisfiable core [2022-11-23 14:49:31,699 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:49:31,966 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:49:31,967 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:49:36,582 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:49:36,583 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:49:36,583 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [572516050] [2022-11-23 14:49:36,583 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:49:36,583 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1609078016] [2022-11-23 14:49:36,583 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1609078016] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:49:36,583 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [876886597] [2022-11-23 14:49:36,587 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-11-23 14:49:36,587 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:49:36,588 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:49:36,588 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:49:36,588 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:49:37,885 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 25 for LOIs [2022-11-23 14:49:37,913 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:49:39,695 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '756#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:49:39,695 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:49:39,695 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:49:39,696 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 14 [2022-11-23 14:49:39,696 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1133781343] [2022-11-23 14:49:39,696 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 14:49:39,696 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-23 14:49:39,696 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:49:39,697 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-23 14:49:39,697 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=427, Unknown=0, NotChecked=0, Total=506 [2022-11-23 14:49:39,697 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand has 14 states, 14 states have (on average 1.7142857142857142) internal successors, (24), 12 states have internal predecessors, (24), 4 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-23 14:49:54,179 WARN L233 SmtUtils]: Spent 13.76s on a formula simplification that was a NOOP. DAG size: 44 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 14:49:56,765 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 14:49:58,769 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 14:50:07,261 WARN L233 SmtUtils]: Spent 7.18s on a formula simplification that was a NOOP. DAG size: 40 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 14:50:13,661 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 14:50:16,015 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 14:50:18,028 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 14:50:19,974 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:50:19,974 INFO L93 Difference]: Finished difference Result 53 states and 61 transitions. [2022-11-23 14:50:19,976 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-23 14:50:19,977 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7142857142857142) internal successors, (24), 12 states have internal predecessors, (24), 4 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 17 [2022-11-23 14:50:19,977 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:50:19,978 INFO L225 Difference]: With dead ends: 53 [2022-11-23 14:50:19,978 INFO L226 Difference]: Without dead ends: 51 [2022-11-23 14:50:19,978 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 30.5s TimeCoverageRelationStatistics Valid=113, Invalid=589, Unknown=0, NotChecked=0, Total=702 [2022-11-23 14:50:19,981 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 29 mSDsluCounter, 61 mSDsCounter, 0 mSdLazyCounter, 103 mSolverCounterSat, 23 mSolverCounterUnsat, 5 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 14.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 131 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 103 IncrementalHoareTripleChecker+Invalid, 5 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 15.0s IncrementalHoareTripleChecker+Time [2022-11-23 14:50:19,981 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [31 Valid, 74 Invalid, 131 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 103 Invalid, 5 Unknown, 0 Unchecked, 15.0s Time] [2022-11-23 14:50:19,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2022-11-23 14:50:20,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 41. [2022-11-23 14:50:20,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 31 states have (on average 1.1612903225806452) internal successors, (36), 34 states have internal predecessors, (36), 5 states have call successors, (5), 4 states have call predecessors, (5), 4 states have return successors, (5), 2 states have call predecessors, (5), 5 states have call successors, (5) [2022-11-23 14:50:20,010 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 46 transitions. [2022-11-23 14:50:20,010 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 46 transitions. Word has length 17 [2022-11-23 14:50:20,011 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:50:20,011 INFO L495 AbstractCegarLoop]: Abstraction has 41 states and 46 transitions. [2022-11-23 14:50:20,011 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 1.7142857142857142) internal successors, (24), 12 states have internal predecessors, (24), 4 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-23 14:50:20,011 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 46 transitions. [2022-11-23 14:50:20,013 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-11-23 14:50:20,013 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:50:20,013 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2022-11-23 14:50:20,020 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cda00219-eff2-40be-9605-6471dc1b3c2a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-23 14:50:20,219 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cda00219-eff2-40be-9605-6471dc1b3c2a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-11-23 14:50:20,220 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:50:20,220 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:50:20,220 INFO L85 PathProgramCache]: Analyzing trace with hash 687309511, now seen corresponding path program 2 times [2022-11-23 14:50:20,220 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:50:20,221 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2058306089] [2022-11-23 14:50:20,221 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:50:20,221 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:50:20,246 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:50:20,250 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [338255239] [2022-11-23 14:50:20,250 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 14:50:20,250 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:50:20,250 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cda00219-eff2-40be-9605-6471dc1b3c2a/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:50:20,252 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cda00219-eff2-40be-9605-6471dc1b3c2a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:50:20,279 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cda00219-eff2-40be-9605-6471dc1b3c2a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-23 14:50:20,469 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-23 14:50:20,469 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:50:20,471 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 16 conjunts are in the unsatisfiable core [2022-11-23 14:50:20,473 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:50:20,678 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 8 proven. 5 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-23 14:50:20,678 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:50:20,959 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 8 proven. 5 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-23 14:50:20,959 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:50:20,959 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2058306089] [2022-11-23 14:50:20,960 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:50:20,960 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [338255239] [2022-11-23 14:50:20,960 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [338255239] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:50:20,960 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1950483281] [2022-11-23 14:50:20,962 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-11-23 14:50:20,962 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:50:20,963 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:50:20,963 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:50:20,963 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:50:22,221 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 37 for LOIs [2022-11-23 14:50:22,284 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:50:23,620 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1058#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:50:23,621 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:50:23,621 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:50:23,621 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6] total 9 [2022-11-23 14:50:23,621 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1821707904] [2022-11-23 14:50:23,621 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 14:50:23,622 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-11-23 14:50:23,622 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:50:23,622 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-11-23 14:50:23,623 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=250, Unknown=0, NotChecked=0, Total=306 [2022-11-23 14:50:23,623 INFO L87 Difference]: Start difference. First operand 41 states and 46 transitions. Second operand has 9 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 9 states have internal predecessors, (25), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-11-23 14:50:23,917 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:50:23,917 INFO L93 Difference]: Finished difference Result 57 states and 64 transitions. [2022-11-23 14:50:23,919 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-23 14:50:23,920 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 9 states have internal predecessors, (25), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 24 [2022-11-23 14:50:23,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:50:23,921 INFO L225 Difference]: With dead ends: 57 [2022-11-23 14:50:23,921 INFO L226 Difference]: Without dead ends: 42 [2022-11-23 14:50:23,921 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 53 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=56, Invalid=250, Unknown=0, NotChecked=0, Total=306 [2022-11-23 14:50:23,922 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 6 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-23 14:50:23,923 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 49 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-23 14:50:23,924 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2022-11-23 14:50:23,948 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2022-11-23 14:50:23,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 31 states have (on average 1.1290322580645162) internal successors, (35), 34 states have internal predecessors, (35), 5 states have call successors, (5), 4 states have call predecessors, (5), 4 states have return successors, (5), 2 states have call predecessors, (5), 5 states have call successors, (5) [2022-11-23 14:50:23,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2022-11-23 14:50:23,949 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 24 [2022-11-23 14:50:23,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:50:23,950 INFO L495 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2022-11-23 14:50:23,950 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 9 states have internal predecessors, (25), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-11-23 14:50:23,950 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2022-11-23 14:50:23,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-11-23 14:50:23,951 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:50:23,951 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:50:23,959 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cda00219-eff2-40be-9605-6471dc1b3c2a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-23 14:50:24,158 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cda00219-eff2-40be-9605-6471dc1b3c2a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2022-11-23 14:50:24,159 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:50:24,159 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:50:24,159 INFO L85 PathProgramCache]: Analyzing trace with hash -1523523497, now seen corresponding path program 3 times [2022-11-23 14:50:24,159 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:50:24,159 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [999733145] [2022-11-23 14:50:24,159 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:50:24,159 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:50:24,171 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:50:24,172 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [421518942] [2022-11-23 14:50:24,172 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 14:50:24,172 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:50:24,172 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cda00219-eff2-40be-9605-6471dc1b3c2a/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:50:24,173 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cda00219-eff2-40be-9605-6471dc1b3c2a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:50:24,177 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cda00219-eff2-40be-9605-6471dc1b3c2a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-23 14:50:24,252 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 14:50:24,252 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:50:24,254 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 32 conjunts are in the unsatisfiable core [2022-11-23 14:50:24,256 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:50:24,606 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 2 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:50:24,606 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:50:38,339 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 2 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:50:38,339 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:50:38,339 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [999733145] [2022-11-23 14:50:38,339 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:50:38,339 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [421518942] [2022-11-23 14:50:38,340 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [421518942] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:50:38,340 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2000392889] [2022-11-23 14:50:38,342 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-11-23 14:50:38,342 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:50:38,342 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:50:38,342 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:50:38,343 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:50:39,552 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 37 for LOIs [2022-11-23 14:50:39,611 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:50:43,744 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1361#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:50:43,744 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:50:43,744 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:50:43,745 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11] total 19 [2022-11-23 14:50:43,745 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1268397117] [2022-11-23 14:50:43,745 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 14:50:43,746 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-11-23 14:50:43,746 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:50:43,746 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-11-23 14:50:43,747 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=638, Unknown=2, NotChecked=0, Total=756 [2022-11-23 14:50:43,747 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand has 19 states, 19 states have (on average 1.894736842105263) internal successors, (36), 17 states have internal predecessors, (36), 4 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-23 14:51:12,673 WARN L233 SmtUtils]: Spent 14.26s on a formula simplification that was a NOOP. DAG size: 49 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 14:51:15,149 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 14:51:17,154 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 14:51:20,481 WARN L837 $PredicateComparison]: unable to prove that (let ((.cse18 (* 2 (* (div (mod |c_ULTIMATE.start_main_~b~0#1| 4294967296) 2) |c_ULTIMATE.start_main_~q~0#1|)))) (let ((.cse12 (+ .cse18 |c_ULTIMATE.start_main_~r~0#1|)) (.cse4 (mod |c_ULTIMATE.start_main_~b~0#1| 1073741824)) (.cse17 (mod |c_ULTIMATE.start_main_~b~0#1| 536870912)) (.cse5 (mod |c_ULTIMATE.start_main_~r~0#1| 4294967296))) (let ((.cse11 (<= (* 8 .cse17) .cse5)) (.cse6 (<= (* .cse4 4) .cse5)) (.cse0 (mod |c_ULTIMATE.start_main_~A~0#1| 4294967296)) (.cse13 (* (div .cse12 4294967296) 4294967296))) (and (= .cse0 (mod (+ |c_ULTIMATE.start_main_~r~0#1| (* |c_ULTIMATE.start_main_~b~0#1| |c_ULTIMATE.start_main_~q~0#1|)) 4294967296)) (or (let ((.cse2 (* (* .cse4 |c_ULTIMATE.start_main_~q~0#1|) 4))) (let ((.cse3 (+ .cse2 |c_ULTIMATE.start_main_~r~0#1|))) (let ((.cse1 (* (div .cse3 4294967296) 4294967296))) (and (< (+ .cse0 .cse1) (+ .cse2 |c_ULTIMATE.start_main_~r~0#1| 1)) (< .cse3 (+ .cse0 .cse1 1)))))) (not (<= (* 2 (mod |c_ULTIMATE.start_main_~b~0#1| 2147483648)) .cse5)) .cse6) (let ((.cse10 (mod |c_ULTIMATE.start_main_~b~0#1| 268435456))) (or (let ((.cse8 (* (* .cse10 |c_ULTIMATE.start_main_~q~0#1|) 16))) (let ((.cse9 (+ |c_ULTIMATE.start_main_~r~0#1| .cse8))) (let ((.cse7 (* (div .cse9 4294967296) 4294967296))) (and (< (+ .cse0 .cse7) (+ |c_ULTIMATE.start_main_~r~0#1| .cse8 1)) (< .cse9 (+ .cse0 .cse7 1)))))) (not .cse11) (<= (* .cse10 16) .cse5))) (< .cse12 (+ .cse0 .cse13 1)) (or .cse11 (let ((.cse16 (* 8 (* .cse17 |c_ULTIMATE.start_main_~q~0#1|)))) (let ((.cse14 (+ .cse16 |c_ULTIMATE.start_main_~r~0#1|))) (let ((.cse15 (* (div .cse14 4294967296) 4294967296))) (and (< .cse14 (+ .cse15 .cse0 1)) (< (+ .cse15 .cse0) (+ .cse16 |c_ULTIMATE.start_main_~r~0#1| 1)))))) (not .cse6)) (< (+ .cse0 .cse13) (+ .cse18 |c_ULTIMATE.start_main_~r~0#1| 1)))))) is different from false [2022-11-23 14:51:30,336 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 14:51:32,069 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.73s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 14:51:33,619 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.55s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 14:51:34,965 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.01s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 14:51:42,229 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 14:51:44,224 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 14:51:46,567 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 14:53:11,208 WARN L233 SmtUtils]: Spent 1.25m on a formula simplification that was a NOOP. DAG size: 98 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 14:53:14,612 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 14:53:15,075 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:53:15,075 INFO L93 Difference]: Finished difference Result 76 states and 85 transitions. [2022-11-23 14:53:15,076 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-11-23 14:53:15,076 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.894736842105263) internal successors, (36), 17 states have internal predecessors, (36), 4 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 23 [2022-11-23 14:53:15,076 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:53:15,077 INFO L225 Difference]: With dead ends: 76 [2022-11-23 14:53:15,077 INFO L226 Difference]: Without dead ends: 59 [2022-11-23 14:53:15,078 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 134.8s TimeCoverageRelationStatistics Valid=166, Invalid=819, Unknown=11, NotChecked=60, Total=1056 [2022-11-23 14:53:15,079 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 42 mSDsluCounter, 119 mSDsCounter, 0 mSdLazyCounter, 246 mSolverCounterSat, 55 mSolverCounterUnsat, 6 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 31.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 136 SdHoareTripleChecker+Invalid, 308 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 246 IncrementalHoareTripleChecker+Invalid, 6 IncrementalHoareTripleChecker+Unknown, 1 IncrementalHoareTripleChecker+Unchecked, 31.8s IncrementalHoareTripleChecker+Time [2022-11-23 14:53:15,079 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [46 Valid, 136 Invalid, 308 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 246 Invalid, 6 Unknown, 1 Unchecked, 31.8s Time] [2022-11-23 14:53:15,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2022-11-23 14:53:15,111 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 54. [2022-11-23 14:53:15,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 40 states have (on average 1.075) internal successors, (43), 43 states have internal predecessors, (43), 8 states have call successors, (8), 5 states have call predecessors, (8), 5 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2022-11-23 14:53:15,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 59 transitions. [2022-11-23 14:53:15,113 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 59 transitions. Word has length 23 [2022-11-23 14:53:15,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:53:15,114 INFO L495 AbstractCegarLoop]: Abstraction has 54 states and 59 transitions. [2022-11-23 14:53:15,114 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.894736842105263) internal successors, (36), 17 states have internal predecessors, (36), 4 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-23 14:53:15,114 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 59 transitions. [2022-11-23 14:53:15,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-11-23 14:53:15,115 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:53:15,115 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1] [2022-11-23 14:53:15,121 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cda00219-eff2-40be-9605-6471dc1b3c2a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-23 14:53:15,321 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cda00219-eff2-40be-9605-6471dc1b3c2a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:53:15,321 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:53:15,322 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:53:15,322 INFO L85 PathProgramCache]: Analyzing trace with hash 1838953197, now seen corresponding path program 4 times [2022-11-23 14:53:15,322 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:53:15,322 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [624973258] [2022-11-23 14:53:15,322 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:53:15,322 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:53:15,334 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:53:15,335 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1455719738] [2022-11-23 14:53:15,335 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-23 14:53:15,335 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:53:15,335 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cda00219-eff2-40be-9605-6471dc1b3c2a/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:53:15,337 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cda00219-eff2-40be-9605-6471dc1b3c2a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:53:15,363 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cda00219-eff2-40be-9605-6471dc1b3c2a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-23 14:53:15,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:53:15,545 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-23 14:53:15,546 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:53:15,713 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 12 proven. 15 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-23 14:53:15,713 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:53:18,511 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 15 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-23 14:53:18,511 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:53:18,511 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [624973258] [2022-11-23 14:53:18,512 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:53:18,512 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1455719738] [2022-11-23 14:53:18,512 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1455719738] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:53:18,512 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [179547874] [2022-11-23 14:53:18,514 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-11-23 14:53:18,514 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:53:18,514 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:53:18,515 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:53:18,515 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:53:19,274 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 25 for LOIs [2022-11-23 14:53:19,297 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:53:20,495 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1776#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:53:20,496 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:53:20,496 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:53:20,496 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 8] total 12 [2022-11-23 14:53:20,496 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1420653839] [2022-11-23 14:53:20,497 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 14:53:20,497 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-11-23 14:53:20,497 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:53:20,498 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-11-23 14:53:20,498 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=351, Unknown=1, NotChecked=0, Total=420 [2022-11-23 14:53:20,498 INFO L87 Difference]: Start difference. First operand 54 states and 59 transitions. Second operand has 12 states, 12 states have (on average 2.75) internal successors, (33), 12 states have internal predecessors, (33), 7 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-23 14:53:21,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:53:21,787 INFO L93 Difference]: Finished difference Result 70 states and 77 transitions. [2022-11-23 14:53:21,788 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-23 14:53:21,788 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.75) internal successors, (33), 12 states have internal predecessors, (33), 7 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Word has length 33 [2022-11-23 14:53:21,788 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:53:21,789 INFO L225 Difference]: With dead ends: 70 [2022-11-23 14:53:21,789 INFO L226 Difference]: Without dead ends: 48 [2022-11-23 14:53:21,790 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 76 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 107 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=84, Invalid=421, Unknown=1, NotChecked=0, Total=506 [2022-11-23 14:53:21,790 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 13 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 74 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 75 SdHoareTripleChecker+Invalid, 97 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 74 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:53:21,791 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 75 Invalid, 97 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 74 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-11-23 14:53:21,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2022-11-23 14:53:21,815 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2022-11-23 14:53:21,816 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 36 states have (on average 1.0555555555555556) internal successors, (38), 38 states have internal predecessors, (38), 7 states have call successors, (7), 4 states have call predecessors, (7), 4 states have return successors, (7), 5 states have call predecessors, (7), 7 states have call successors, (7) [2022-11-23 14:53:21,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 52 transitions. [2022-11-23 14:53:21,817 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 52 transitions. Word has length 33 [2022-11-23 14:53:21,817 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:53:21,818 INFO L495 AbstractCegarLoop]: Abstraction has 48 states and 52 transitions. [2022-11-23 14:53:21,818 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.75) internal successors, (33), 12 states have internal predecessors, (33), 7 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-23 14:53:21,818 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 52 transitions. [2022-11-23 14:53:21,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-11-23 14:53:21,819 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:53:21,819 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1] [2022-11-23 14:53:21,838 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cda00219-eff2-40be-9605-6471dc1b3c2a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-23 14:53:22,029 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cda00219-eff2-40be-9605-6471dc1b3c2a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:53:22,030 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:53:22,030 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:53:22,030 INFO L85 PathProgramCache]: Analyzing trace with hash -2103087438, now seen corresponding path program 5 times [2022-11-23 14:53:22,030 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:53:22,030 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1844990901] [2022-11-23 14:53:22,031 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:53:22,031 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:53:22,041 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:53:22,041 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [139788812] [2022-11-23 14:53:22,041 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 14:53:22,042 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:53:22,042 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cda00219-eff2-40be-9605-6471dc1b3c2a/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:53:22,043 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cda00219-eff2-40be-9605-6471dc1b3c2a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:53:22,046 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cda00219-eff2-40be-9605-6471dc1b3c2a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-23 14:53:41,620 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-23 14:53:41,620 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:53:41,663 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 39 conjunts are in the unsatisfiable core [2022-11-23 14:53:41,665 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:53:43,395 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 27 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-23 14:53:43,395 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:54:23,441 WARN L233 SmtUtils]: Spent 6.94s on a formula simplification that was a NOOP. DAG size: 90 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 14:55:24,338 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 23 refuted. 4 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-23 14:55:24,338 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:55:24,339 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1844990901] [2022-11-23 14:55:24,339 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:55:24,339 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [139788812] [2022-11-23 14:55:24,339 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [139788812] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:55:24,339 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2086306001] [2022-11-23 14:55:24,344 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-11-23 14:55:24,344 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:55:24,345 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:55:24,345 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:55:24,345 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:55:25,376 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 25 for LOIs [2022-11-23 14:55:25,397 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:55:37,332 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2189#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:55:37,332 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:55:37,332 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:55:37,333 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 22 [2022-11-23 14:55:37,333 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [88837362] [2022-11-23 14:55:37,333 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 14:55:37,333 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-11-23 14:55:37,334 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:55:37,334 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-11-23 14:55:37,335 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=771, Unknown=18, NotChecked=0, Total=930 [2022-11-23 14:55:37,335 INFO L87 Difference]: Start difference. First operand 48 states and 52 transitions. Second operand has 22 states, 22 states have (on average 1.8181818181818181) internal successors, (40), 20 states have internal predecessors, (40), 8 states have call successors, (8), 3 states have call predecessors, (8), 1 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-23 15:02:09,667 WARN L233 SmtUtils]: Spent 6.26m on a formula simplification that was a NOOP. DAG size: 257 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 15:02:11,155 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.15s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 15:02:13,527 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.27s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 15:02:19,005 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 15:02:26,402 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 15:02:29,011 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers []