./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/hard2_unwindbound100.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 4e7fbc69 Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/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_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/hard2_unwindbound100.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/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_47fe4af3-5ac2-45f8-b6c8-7e492e627445/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 83ea03e3a970ed9a04e84a7095cded72c8faa028a8061c6de69ab7c540d420f5 --- 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 14:57:26,051 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-23 14:57:26,052 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-23 14:57:26,083 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-23 14:57:26,083 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-23 14:57:26,088 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-23 14:57:26,092 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-23 14:57:26,096 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-23 14:57:26,098 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-23 14:57:26,105 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-23 14:57:26,106 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-23 14:57:26,108 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-23 14:57:26,108 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-23 14:57:26,109 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-23 14:57:26,110 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-23 14:57:26,111 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-23 14:57:26,112 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-23 14:57:26,113 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-23 14:57:26,114 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-23 14:57:26,116 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-23 14:57:26,121 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-23 14:57:26,124 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-23 14:57:26,126 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-23 14:57:26,127 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-23 14:57:26,138 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-23 14:57:26,138 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-23 14:57:26,139 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-23 14:57:26,141 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-23 14:57:26,141 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-23 14:57:26,142 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-23 14:57:26,143 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-23 14:57:26,144 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-23 14:57:26,146 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-23 14:57:26,148 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-23 14:57:26,149 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-23 14:57:26,150 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-23 14:57:26,150 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-23 14:57:26,151 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-23 14:57:26,151 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-23 14:57:26,153 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-23 14:57:26,153 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-23 14:57:26,154 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-23 14:57:26,199 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-23 14:57:26,202 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-23 14:57:26,203 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-23 14:57:26,203 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-23 14:57:26,204 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-23 14:57:26,204 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-23 14:57:26,205 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-23 14:57:26,205 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-23 14:57:26,205 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-23 14:57:26,205 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-23 14:57:26,207 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-23 14:57:26,207 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-23 14:57:26,207 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-23 14:57:26,207 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-23 14:57:26,208 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-23 14:57:26,208 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-23 14:57:26,208 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-23 14:57:26,208 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-23 14:57:26,210 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-23 14:57:26,210 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-23 14:57:26,210 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-23 14:57:26,210 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-23 14:57:26,211 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-23 14:57:26,211 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-23 14:57:26,211 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-23 14:57:26,211 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-23 14:57:26,212 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-23 14:57:26,212 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-23 14:57:26,212 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-23 14:57:26,213 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-23 14:57:26,213 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-23 14:57:26,213 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-23 14:57:26,214 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-23 14:57:26,214 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-23 14:57:26,214 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-23 14:57:26,215 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-23 14:57:26,215 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-23 14:57:26,215 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-23 14:57:26,215 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-23 14:57:26,216 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-23 14:57:26,216 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-23 14:57:26,216 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_47fe4af3-5ac2-45f8-b6c8-7e492e627445/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 83ea03e3a970ed9a04e84a7095cded72c8faa028a8061c6de69ab7c540d420f5 [2022-11-23 14:57:26,517 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-23 14:57:26,545 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-23 14:57:26,564 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-23 14:57:26,565 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-23 14:57:26,565 INFO L275 PluginConnector]: CDTParser initialized [2022-11-23 14:57:26,567 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/../../sv-benchmarks/c/nla-digbench-scaling/hard2_unwindbound100.c [2022-11-23 14:57:29,571 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-23 14:57:29,795 INFO L351 CDTParser]: Found 1 translation units. [2022-11-23 14:57:29,796 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/sv-benchmarks/c/nla-digbench-scaling/hard2_unwindbound100.c [2022-11-23 14:57:29,802 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/data/92836fc3e/261a51b839ff41c5aab0f0d384f8fa12/FLAG271ad7860 [2022-11-23 14:57:29,818 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/data/92836fc3e/261a51b839ff41c5aab0f0d384f8fa12 [2022-11-23 14:57:29,820 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-23 14:57:29,822 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-23 14:57:29,824 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-23 14:57:29,824 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-23 14:57:29,828 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-23 14:57:29,828 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:57:29" (1/1) ... [2022-11-23 14:57:29,830 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5d9c0306 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:57:29, skipping insertion in model container [2022-11-23 14:57:29,831 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:57:29" (1/1) ... [2022-11-23 14:57:29,838 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-23 14:57:29,857 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-23 14:57:30,002 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_47fe4af3-5ac2-45f8-b6c8-7e492e627445/sv-benchmarks/c/nla-digbench-scaling/hard2_unwindbound100.c[526,539] [2022-11-23 14:57:30,020 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-23 14:57:30,032 INFO L203 MainTranslator]: Completed pre-run [2022-11-23 14:57:30,050 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_47fe4af3-5ac2-45f8-b6c8-7e492e627445/sv-benchmarks/c/nla-digbench-scaling/hard2_unwindbound100.c[526,539] [2022-11-23 14:57:30,056 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-23 14:57:30,068 INFO L208 MainTranslator]: Completed translation [2022-11-23 14:57:30,069 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:57:30 WrapperNode [2022-11-23 14:57:30,069 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-23 14:57:30,070 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-23 14:57:30,070 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-23 14:57:30,070 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-23 14:57:30,076 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:57:30" (1/1) ... [2022-11-23 14:57:30,082 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:57:30" (1/1) ... [2022-11-23 14:57:30,121 INFO L138 Inliner]: procedures = 14, calls = 22, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 69 [2022-11-23 14:57:30,122 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-23 14:57:30,124 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-23 14:57:30,124 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-23 14:57:30,124 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-23 14:57:30,134 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:57:30" (1/1) ... [2022-11-23 14:57:30,136 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:57:30" (1/1) ... [2022-11-23 14:57:30,137 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:57:30" (1/1) ... [2022-11-23 14:57:30,138 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:57:30" (1/1) ... [2022-11-23 14:57:30,141 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:57:30" (1/1) ... [2022-11-23 14:57:30,145 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:57:30" (1/1) ... [2022-11-23 14:57:30,146 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:57:30" (1/1) ... [2022-11-23 14:57:30,147 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:57:30" (1/1) ... [2022-11-23 14:57:30,148 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-23 14:57:30,164 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-23 14:57:30,164 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-23 14:57:30,164 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-23 14:57:30,165 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:57:30" (1/1) ... [2022-11-23 14:57:30,171 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-23 14:57:30,182 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:57:30,196 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-23 14:57:30,226 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-23 14:57:30,265 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-23 14:57:30,266 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-23 14:57:30,266 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-23 14:57:30,266 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-23 14:57:30,266 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-11-23 14:57:30,267 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-11-23 14:57:30,335 INFO L235 CfgBuilder]: Building ICFG [2022-11-23 14:57:30,337 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-23 14:57:30,488 INFO L276 CfgBuilder]: Performing block encoding [2022-11-23 14:57:30,519 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-23 14:57:30,526 INFO L300 CfgBuilder]: Removed 2 assume(true) statements. [2022-11-23 14:57:30,529 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:57:30 BoogieIcfgContainer [2022-11-23 14:57:30,530 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-23 14:57:30,533 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-23 14:57:30,535 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-23 14:57:30,538 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-23 14:57:30,539 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 02:57:29" (1/3) ... [2022-11-23 14:57:30,540 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4e63dde and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:57:30, skipping insertion in model container [2022-11-23 14:57:30,540 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:57:30" (2/3) ... [2022-11-23 14:57:30,542 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4e63dde and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:57:30, skipping insertion in model container [2022-11-23 14:57:30,543 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:57:30" (3/3) ... [2022-11-23 14:57:30,544 INFO L112 eAbstractionObserver]: Analyzing ICFG hard2_unwindbound100.c [2022-11-23 14:57:30,566 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-23 14:57:30,566 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-23 14:57:30,642 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-23 14:57:30,650 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;@2b0550e5, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-23 14:57:30,651 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-23 14:57:30,656 INFO L276 IsEmpty]: Start isEmpty. Operand has 22 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 13 states have internal predecessors, (20), 7 states have call successors, (7), 1 states have call predecessors, (7), 1 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2022-11-23 14:57:30,664 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-11-23 14:57:30,665 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:57:30,666 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:57:30,666 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:57:30,675 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:57:30,675 INFO L85 PathProgramCache]: Analyzing trace with hash 1291730102, now seen corresponding path program 1 times [2022-11-23 14:57:30,686 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:57:30,687 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [354744759] [2022-11-23 14:57:30,688 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:57:30,689 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:57:30,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:57:30,854 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:57:30,855 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [354744759] [2022-11-23 14:57:30,856 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unsupported non-linear arithmetic [2022-11-23 14:57:30,857 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1216550334] [2022-11-23 14:57:30,857 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:57:30,858 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:57:30,858 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:57:30,865 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:57:30,906 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-23 14:57:30,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:57:30,977 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 1 conjunts are in the unsatisfiable core [2022-11-23 14:57:30,981 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:57:31,002 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 14:57:31,003 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 14:57:31,003 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1216550334] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:57:31,004 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 14:57:31,004 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-23 14:57:31,006 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1485632820] [2022-11-23 14:57:31,007 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:57:31,011 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-11-23 14:57:31,012 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:57:31,038 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-11-23 14:57:31,039 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-23 14:57:31,041 INFO L87 Difference]: Start difference. First operand has 22 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 13 states have internal predecessors, (20), 7 states have call successors, (7), 1 states have call predecessors, (7), 1 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) 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 14:57:31,073 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:57:31,073 INFO L93 Difference]: Finished difference Result 43 states and 74 transitions. [2022-11-23 14:57:31,082 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-11-23 14:57:31,084 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 14:57:31,084 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:57:31,091 INFO L225 Difference]: With dead ends: 43 [2022-11-23 14:57:31,092 INFO L226 Difference]: Without dead ends: 20 [2022-11-23 14:57:31,096 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 14:57:31,101 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 3 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-23 14:57:31,103 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 28 Invalid, 3 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-23 14:57:31,121 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2022-11-23 14:57:31,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2022-11-23 14:57:31,144 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 7 states have call successors, (7), 1 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 14:57:31,147 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 29 transitions. [2022-11-23 14:57:31,149 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 29 transitions. Word has length 7 [2022-11-23 14:57:31,149 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:57:31,150 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 29 transitions. [2022-11-23 14:57:31,150 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 14:57:31,152 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 29 transitions. [2022-11-23 14:57:31,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-11-23 14:57:31,153 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:57:31,153 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:57:31,160 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-23 14:57:31,359 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2022-11-23 14:57:31,360 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:57:31,361 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:57:31,361 INFO L85 PathProgramCache]: Analyzing trace with hash 829671692, now seen corresponding path program 1 times [2022-11-23 14:57:31,361 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:57:31,362 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [893171536] [2022-11-23 14:57:31,362 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:57:31,362 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:57:31,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:57:31,616 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 14:57:31,617 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:57:31,618 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [893171536] [2022-11-23 14:57:31,619 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [893171536] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:57:31,619 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 14:57:31,619 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-23 14:57:31,619 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [49475678] [2022-11-23 14:57:31,620 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:57:31,620 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-23 14:57:31,621 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:57:31,621 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-23 14:57:31,621 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-23 14:57:31,622 INFO L87 Difference]: Start difference. First operand 20 states and 29 transitions. Second operand has 5 states, 5 states have (on average 1.2) internal successors, (6), 3 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 14:57:31,708 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:57:31,708 INFO L93 Difference]: Finished difference Result 33 states and 46 transitions. [2022-11-23 14:57:31,709 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-23 14:57:31,709 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.2) internal successors, (6), 3 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 14:57:31,709 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:57:31,710 INFO L225 Difference]: With dead ends: 33 [2022-11-23 14:57:31,710 INFO L226 Difference]: Without dead ends: 31 [2022-11-23 14:57:31,711 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-23 14:57:31,712 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 13 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-23 14:57:31,712 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 84 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-23 14:57:31,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2022-11-23 14:57:31,722 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 24. [2022-11-23 14:57:31,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 15 states have internal predecessors, (19), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-23 14:57:31,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 32 transitions. [2022-11-23 14:57:31,723 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 32 transitions. Word has length 7 [2022-11-23 14:57:31,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:57:31,724 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 32 transitions. [2022-11-23 14:57:31,724 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.2) internal successors, (6), 3 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 14:57:31,724 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 32 transitions. [2022-11-23 14:57:31,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-23 14:57:31,725 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:57:31,725 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:57:31,725 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-23 14:57:31,726 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:57:31,726 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:57:31,726 INFO L85 PathProgramCache]: Analyzing trace with hash -166824855, now seen corresponding path program 1 times [2022-11-23 14:57:31,727 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:57:31,727 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2006945151] [2022-11-23 14:57:31,727 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:57:31,727 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:57:31,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:57:31,761 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:57:31,761 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2006945151] [2022-11-23 14:57:31,761 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unsupported non-linear arithmetic [2022-11-23 14:57:31,761 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1108203346] [2022-11-23 14:57:31,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:57:31,762 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:57:31,762 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:57:31,776 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:57:31,804 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-23 14:57:31,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:57:31,861 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-23 14:57:31,863 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:57:31,929 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 14:57:31,929 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 14:57:31,930 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1108203346] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:57:31,934 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 14:57:31,935 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-23 14:57:31,935 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1197428820] [2022-11-23 14:57:31,935 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:57:31,936 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-23 14:57:31,936 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:57:31,936 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-23 14:57:31,937 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-23 14:57:31,937 INFO L87 Difference]: Start difference. First operand 24 states and 32 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:57:31,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:57:31,963 INFO L93 Difference]: Finished difference Result 39 states and 52 transitions. [2022-11-23 14:57:31,964 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-23 14:57:31,964 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2022-11-23 14:57:31,964 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:57:31,965 INFO L225 Difference]: With dead ends: 39 [2022-11-23 14:57:31,965 INFO L226 Difference]: Without dead ends: 26 [2022-11-23 14:57:31,966 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-23 14:57:31,967 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 0 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-23 14:57:31,968 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 73 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-23 14:57:31,969 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-11-23 14:57:31,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2022-11-23 14:57:31,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 16 states have (on average 1.3125) internal successors, (21), 17 states have internal predecessors, (21), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-23 14:57:31,976 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2022-11-23 14:57:31,976 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 9 [2022-11-23 14:57:31,977 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:57:31,977 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2022-11-23 14:57:31,977 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:57:31,977 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2022-11-23 14:57:31,978 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-11-23 14:57:31,978 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:57:31,978 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:57:31,986 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-23 14:57:32,179 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:57:32,179 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:57:32,179 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:57:32,180 INFO L85 PathProgramCache]: Analyzing trace with hash -439138420, now seen corresponding path program 1 times [2022-11-23 14:57:32,180 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:57:32,180 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [802789355] [2022-11-23 14:57:32,180 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:57:32,180 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:57:32,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:57:32,308 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 14:57:32,308 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:57:32,309 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [802789355] [2022-11-23 14:57:32,314 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [802789355] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:57:32,314 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 14:57:32,314 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-23 14:57:32,314 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1265608190] [2022-11-23 14:57:32,315 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:57:32,326 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-23 14:57:32,326 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:57:32,326 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-23 14:57:32,328 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-23 14:57:32,328 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 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 14:57:32,405 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:57:32,407 INFO L93 Difference]: Finished difference Result 39 states and 51 transitions. [2022-11-23 14:57:32,408 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-23 14:57:32,408 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 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 12 [2022-11-23 14:57:32,409 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:57:32,410 INFO L225 Difference]: With dead ends: 39 [2022-11-23 14:57:32,410 INFO L226 Difference]: Without dead ends: 37 [2022-11-23 14:57:32,410 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-23 14:57:32,411 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 11 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:57:32,412 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 84 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 14:57:32,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2022-11-23 14:57:32,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 30. [2022-11-23 14:57:32,419 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 19 states have (on average 1.263157894736842) internal successors, (24), 20 states have internal predecessors, (24), 7 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-23 14:57:32,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2022-11-23 14:57:32,420 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 12 [2022-11-23 14:57:32,420 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:57:32,420 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2022-11-23 14:57:32,421 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 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 14:57:32,421 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2022-11-23 14:57:32,421 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-11-23 14:57:32,421 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:57:32,422 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:57:32,422 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-11-23 14:57:32,422 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:57:32,423 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:57:32,423 INFO L85 PathProgramCache]: Analyzing trace with hash -235147060, now seen corresponding path program 1 times [2022-11-23 14:57:32,423 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:57:32,423 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1008916748] [2022-11-23 14:57:32,423 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:57:32,424 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:57:32,433 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:57:32,433 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1811679043] [2022-11-23 14:57:32,433 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:57:32,434 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:57:32,434 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:57:32,435 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:57:32,465 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-23 14:57:32,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:57:32,499 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-23 14:57:32,501 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:57:32,618 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 14:57:32,619 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:57:32,762 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 14:57:32,762 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:57:32,762 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1008916748] [2022-11-23 14:57:32,762 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:57:32,763 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1811679043] [2022-11-23 14:57:32,763 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1811679043] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:57:32,763 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1084137075] [2022-11-23 14:57:32,782 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-11-23 14:57:32,782 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:57:32,786 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:57:32,792 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:57:32,799 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:57:33,230 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 68 for LOIs [2022-11-23 14:57:33,257 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:57:33,976 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [1084137075] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:57:33,976 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:57:33,976 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [8, 7] total 17 [2022-11-23 14:57:33,977 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2110544053] [2022-11-23 14:57:33,977 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:57:33,978 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-23 14:57:33,978 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:57:33,978 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-23 14:57:33,978 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=207, Unknown=0, NotChecked=0, Total=272 [2022-11-23 14:57:33,979 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand has 7 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 5 states have internal predecessors, (8), 1 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-23 14:57:34,185 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:57:34,185 INFO L93 Difference]: Finished difference Result 49 states and 57 transitions. [2022-11-23 14:57:34,185 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-23 14:57:34,186 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 5 states have internal predecessors, (8), 1 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 17 [2022-11-23 14:57:34,186 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:57:34,187 INFO L225 Difference]: With dead ends: 49 [2022-11-23 14:57:34,187 INFO L226 Difference]: Without dead ends: 47 [2022-11-23 14:57:34,187 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 28 SyntacticMatches, 6 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 129 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=65, Invalid=207, Unknown=0, NotChecked=0, Total=272 [2022-11-23 14:57:34,188 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 4 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 89 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 90 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 89 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-23 14:57:34,188 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 70 Invalid, 90 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 89 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-23 14:57:34,189 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2022-11-23 14:57:34,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 45. [2022-11-23 14:57:34,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 28 states have (on average 1.1785714285714286) internal successors, (33), 30 states have internal predecessors, (33), 10 states have call successors, (10), 6 states have call predecessors, (10), 6 states have return successors, (9), 8 states have call predecessors, (9), 9 states have call successors, (9) [2022-11-23 14:57:34,201 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 52 transitions. [2022-11-23 14:57:34,202 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 52 transitions. Word has length 17 [2022-11-23 14:57:34,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:57:34,202 INFO L495 AbstractCegarLoop]: Abstraction has 45 states and 52 transitions. [2022-11-23 14:57:34,202 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 5 states have internal predecessors, (8), 1 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-23 14:57:34,202 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 52 transitions. [2022-11-23 14:57:34,203 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-11-23 14:57:34,203 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:57:34,203 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:57:34,214 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2022-11-23 14:57:34,409 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:57:34,409 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:57:34,410 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:57:34,410 INFO L85 PathProgramCache]: Analyzing trace with hash 2012527405, now seen corresponding path program 1 times [2022-11-23 14:57:34,410 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:57:34,410 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1142354075] [2022-11-23 14:57:34,411 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:57:34,411 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:57:34,420 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:57:34,420 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [933513350] [2022-11-23 14:57:34,420 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:57:34,420 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:57:34,420 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:57:34,421 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:57:34,430 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-23 14:57:34,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:57:34,483 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 17 conjunts are in the unsatisfiable core [2022-11-23 14:57:34,484 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:57:34,625 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-23 14:57:34,626 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:57:34,763 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-23 14:57:34,763 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:57:34,763 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1142354075] [2022-11-23 14:57:34,763 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:57:34,763 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [933513350] [2022-11-23 14:57:34,764 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [933513350] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:57:34,764 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [52449075] [2022-11-23 14:57:34,766 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-11-23 14:57:34,767 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:57:34,768 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:57:34,768 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:57:34,768 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:57:35,205 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 84 for LOIs [2022-11-23 14:57:35,269 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:57:36,763 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [52449075] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:57:36,763 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:57:36,763 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [7, 7] total 19 [2022-11-23 14:57:36,763 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [289230966] [2022-11-23 14:57:36,763 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:57:36,764 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-11-23 14:57:36,764 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:57:36,764 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-11-23 14:57:36,765 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=268, Unknown=0, NotChecked=0, Total=342 [2022-11-23 14:57:36,765 INFO L87 Difference]: Start difference. First operand 45 states and 52 transitions. Second operand has 10 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 8 states have internal predecessors, (11), 2 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2022-11-23 14:57:37,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:57:37,085 INFO L93 Difference]: Finished difference Result 70 states and 87 transitions. [2022-11-23 14:57:37,085 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-11-23 14:57:37,085 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 8 states have internal predecessors, (11), 2 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 25 [2022-11-23 14:57:37,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:57:37,089 INFO L225 Difference]: With dead ends: 70 [2022-11-23 14:57:37,089 INFO L226 Difference]: Without dead ends: 46 [2022-11-23 14:57:37,091 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 47 SyntacticMatches, 9 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 170 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=74, Invalid=268, Unknown=0, NotChecked=0, Total=342 [2022-11-23 14:57:37,093 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 5 mSDsluCounter, 69 mSDsCounter, 0 mSdLazyCounter, 178 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 90 SdHoareTripleChecker+Invalid, 185 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 178 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-23 14:57:37,093 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 90 Invalid, 185 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 178 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-23 14:57:37,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2022-11-23 14:57:37,114 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2022-11-23 14:57:37,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 29 states have (on average 1.1724137931034482) internal successors, (34), 30 states have internal predecessors, (34), 10 states have call successors, (10), 6 states have call predecessors, (10), 6 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-11-23 14:57:37,119 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 53 transitions. [2022-11-23 14:57:37,119 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 53 transitions. Word has length 25 [2022-11-23 14:57:37,120 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:57:37,120 INFO L495 AbstractCegarLoop]: Abstraction has 46 states and 53 transitions. [2022-11-23 14:57:37,120 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 8 states have internal predecessors, (11), 2 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2022-11-23 14:57:37,120 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 53 transitions. [2022-11-23 14:57:37,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-11-23 14:57:37,121 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:57:37,122 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:57:37,129 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-23 14:57:37,328 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:57:37,328 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:57:37,328 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:57:37,329 INFO L85 PathProgramCache]: Analyzing trace with hash 2127759890, now seen corresponding path program 1 times [2022-11-23 14:57:37,329 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:57:37,329 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1704315961] [2022-11-23 14:57:37,329 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:57:37,329 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:57:37,338 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:57:37,339 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1003040163] [2022-11-23 14:57:37,339 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:57:37,339 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:57:37,339 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:57:37,340 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:57:37,349 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-23 14:57:37,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:57:37,394 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 5 conjunts are in the unsatisfiable core [2022-11-23 14:57:37,395 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:57:37,467 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-23 14:57:37,467 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:57:37,522 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-23 14:57:37,522 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:57:37,523 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1704315961] [2022-11-23 14:57:37,523 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:57:37,523 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1003040163] [2022-11-23 14:57:37,523 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1003040163] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:57:37,523 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [874118321] [2022-11-23 14:57:37,525 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-11-23 14:57:37,526 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:57:37,529 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:57:37,530 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:57:37,530 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:57:39,737 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 25 for LOIs [2022-11-23 14:57:39,774 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:57:41,146 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1200#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2022-11-23 14:57:41,146 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:57:41,146 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:57:41,146 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5] total 8 [2022-11-23 14:57:41,146 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [810852893] [2022-11-23 14:57:41,146 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 14:57:41,147 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-23 14:57:41,147 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:57:41,147 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-23 14:57:41,147 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=281, Unknown=0, NotChecked=0, Total=342 [2022-11-23 14:57:41,148 INFO L87 Difference]: Start difference. First operand 46 states and 53 transitions. Second operand has 8 states, 8 states have (on average 2.875) internal successors, (23), 8 states have internal predecessors, (23), 3 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-11-23 14:57:41,296 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:57:41,296 INFO L93 Difference]: Finished difference Result 109 states and 130 transitions. [2022-11-23 14:57:41,296 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-11-23 14:57:41,296 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.875) internal successors, (23), 8 states have internal predecessors, (23), 3 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 27 [2022-11-23 14:57:41,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:57:41,298 INFO L225 Difference]: With dead ends: 109 [2022-11-23 14:57:41,298 INFO L226 Difference]: Without dead ends: 96 [2022-11-23 14:57:41,298 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 61 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 117 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=81, Invalid=381, Unknown=0, NotChecked=0, Total=462 [2022-11-23 14:57:41,299 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 48 mSDsluCounter, 115 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 151 SdHoareTripleChecker+Invalid, 71 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 54 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:57:41,299 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [48 Valid, 151 Invalid, 71 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 54 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 14:57:41,300 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2022-11-23 14:57:41,313 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 91. [2022-11-23 14:57:41,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 58 states have (on average 1.1896551724137931) internal successors, (69), 60 states have internal predecessors, (69), 20 states have call successors, (20), 12 states have call predecessors, (20), 12 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) [2022-11-23 14:57:41,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 107 transitions. [2022-11-23 14:57:41,315 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 107 transitions. Word has length 27 [2022-11-23 14:57:41,316 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:57:41,316 INFO L495 AbstractCegarLoop]: Abstraction has 91 states and 107 transitions. [2022-11-23 14:57:41,316 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.875) internal successors, (23), 8 states have internal predecessors, (23), 3 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-11-23 14:57:41,316 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 107 transitions. [2022-11-23 14:57:41,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-11-23 14:57:41,317 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:57:41,317 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2022-11-23 14:57:41,329 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-23 14:57:41,523 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:57:41,524 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:57:41,525 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:57:41,525 INFO L85 PathProgramCache]: Analyzing trace with hash 747162997, now seen corresponding path program 1 times [2022-11-23 14:57:41,525 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:57:41,525 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2055303398] [2022-11-23 14:57:41,525 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:57:41,526 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:57:41,545 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:57:41,547 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1091798337] [2022-11-23 14:57:41,548 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:57:41,548 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:57:41,548 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:57:41,549 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:57:41,573 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-23 14:57:41,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:57:41,612 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 23 conjunts are in the unsatisfiable core [2022-11-23 14:57:41,614 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:57:41,769 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 9 proven. 18 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-11-23 14:57:41,770 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:57:41,907 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 12 proven. 13 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-11-23 14:57:41,908 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:57:41,908 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2055303398] [2022-11-23 14:57:41,908 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:57:41,908 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1091798337] [2022-11-23 14:57:41,908 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1091798337] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:57:41,908 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [460956257] [2022-11-23 14:57:41,910 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-23 14:57:41,910 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:57:41,910 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:57:41,911 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:57:41,911 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:57:43,837 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2022-11-23 14:57:43,842 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:57:44,854 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1719#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:57:44,855 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:57:44,855 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:57:44,855 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7] total 13 [2022-11-23 14:57:44,855 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [216275096] [2022-11-23 14:57:44,855 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 14:57:44,856 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-11-23 14:57:44,856 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:57:44,856 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-11-23 14:57:44,857 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=379, Unknown=0, NotChecked=0, Total=462 [2022-11-23 14:57:44,857 INFO L87 Difference]: Start difference. First operand 91 states and 107 transitions. Second operand has 13 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 11 states have internal predecessors, (25), 5 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (9), 3 states have call predecessors, (9), 5 states have call successors, (9) [2022-11-23 14:57:45,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:57:45,348 INFO L93 Difference]: Finished difference Result 131 states and 161 transitions. [2022-11-23 14:57:45,349 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-11-23 14:57:45,349 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 11 states have internal predecessors, (25), 5 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (9), 3 states have call predecessors, (9), 5 states have call successors, (9) Word has length 35 [2022-11-23 14:57:45,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:57:45,352 INFO L225 Difference]: With dead ends: 131 [2022-11-23 14:57:45,352 INFO L226 Difference]: Without dead ends: 111 [2022-11-23 14:57:45,353 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 80 SyntacticMatches, 3 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 152 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=99, Invalid=453, Unknown=0, NotChecked=0, Total=552 [2022-11-23 14:57:45,354 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 40 mSDsluCounter, 92 mSDsCounter, 0 mSdLazyCounter, 285 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 119 SdHoareTripleChecker+Invalid, 315 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 285 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-23 14:57:45,354 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [53 Valid, 119 Invalid, 315 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 285 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-23 14:57:45,355 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2022-11-23 14:57:45,374 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 109. [2022-11-23 14:57:45,374 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 69 states have (on average 1.1594202898550725) internal successors, (80), 73 states have internal predecessors, (80), 25 states have call successors, (25), 14 states have call predecessors, (25), 14 states have return successors, (22), 21 states have call predecessors, (22), 22 states have call successors, (22) [2022-11-23 14:57:45,375 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 127 transitions. [2022-11-23 14:57:45,376 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 127 transitions. Word has length 35 [2022-11-23 14:57:45,376 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:57:45,376 INFO L495 AbstractCegarLoop]: Abstraction has 109 states and 127 transitions. [2022-11-23 14:57:45,377 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 11 states have internal predecessors, (25), 5 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (9), 3 states have call predecessors, (9), 5 states have call successors, (9) [2022-11-23 14:57:45,377 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 127 transitions. [2022-11-23 14:57:45,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-11-23 14:57:45,378 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:57:45,378 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:57:45,384 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2022-11-23 14:57:45,583 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:57:45,584 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:57:45,584 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:57:45,585 INFO L85 PathProgramCache]: Analyzing trace with hash 387112662, now seen corresponding path program 1 times [2022-11-23 14:57:45,585 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:57:45,585 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [686350387] [2022-11-23 14:57:45,585 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:57:45,585 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:57:45,594 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:57:45,595 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1001550891] [2022-11-23 14:57:45,595 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:57:45,595 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:57:45,595 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:57:45,596 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:57:45,603 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-23 14:57:45,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:57:45,651 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 17 conjunts are in the unsatisfiable core [2022-11-23 14:57:45,653 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:57:45,790 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 11 proven. 16 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2022-11-23 14:57:45,790 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:57:45,947 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 14 proven. 16 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2022-11-23 14:57:45,947 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:57:45,947 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [686350387] [2022-11-23 14:57:45,948 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:57:45,948 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1001550891] [2022-11-23 14:57:45,948 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1001550891] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:57:45,948 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1029727515] [2022-11-23 14:57:45,950 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-11-23 14:57:45,951 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:57:45,951 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:57:45,951 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:57:45,952 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:57:47,698 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 25 for LOIs [2022-11-23 14:57:47,718 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:57:49,421 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2343#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2022-11-23 14:57:49,421 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:57:49,421 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:57:49,421 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 11 [2022-11-23 14:57:49,421 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1542330251] [2022-11-23 14:57:49,421 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 14:57:49,422 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-11-23 14:57:49,422 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:57:49,422 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-11-23 14:57:49,423 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2022-11-23 14:57:49,423 INFO L87 Difference]: Start difference. First operand 109 states and 127 transitions. Second operand has 11 states, 11 states have (on average 2.6363636363636362) internal successors, (29), 10 states have internal predecessors, (29), 3 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 3 states have call successors, (8) [2022-11-23 14:57:49,632 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:57:49,632 INFO L93 Difference]: Finished difference Result 125 states and 145 transitions. [2022-11-23 14:57:49,633 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-23 14:57:49,633 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.6363636363636362) internal successors, (29), 10 states have internal predecessors, (29), 3 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 3 states have call successors, (8) Word has length 43 [2022-11-23 14:57:49,634 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:57:49,635 INFO L225 Difference]: With dead ends: 125 [2022-11-23 14:57:49,635 INFO L226 Difference]: Without dead ends: 121 [2022-11-23 14:57:49,635 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 104 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 192 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=125, Invalid=475, Unknown=0, NotChecked=0, Total=600 [2022-11-23 14:57:49,636 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 23 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 154 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 168 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 154 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-23 14:57:49,637 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 73 Invalid, 168 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 154 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-23 14:57:49,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2022-11-23 14:57:49,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 117. [2022-11-23 14:57:49,652 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 75 states have (on average 1.1466666666666667) internal successors, (86), 78 states have internal predecessors, (86), 26 states have call successors, (26), 16 states have call predecessors, (26), 15 states have return successors, (23), 22 states have call predecessors, (23), 23 states have call successors, (23) [2022-11-23 14:57:49,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 135 transitions. [2022-11-23 14:57:49,654 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 135 transitions. Word has length 43 [2022-11-23 14:57:49,654 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:57:49,654 INFO L495 AbstractCegarLoop]: Abstraction has 117 states and 135 transitions. [2022-11-23 14:57:49,654 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.6363636363636362) internal successors, (29), 10 states have internal predecessors, (29), 3 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 3 states have call successors, (8) [2022-11-23 14:57:49,655 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 135 transitions. [2022-11-23 14:57:49,656 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-11-23 14:57:49,656 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:57:49,656 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:57:49,672 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-23 14:57:49,862 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2022-11-23 14:57:49,862 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:57:49,862 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:57:49,863 INFO L85 PathProgramCache]: Analyzing trace with hash 1125945480, now seen corresponding path program 1 times [2022-11-23 14:57:49,863 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:57:49,863 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [746113908] [2022-11-23 14:57:49,863 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:57:49,863 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:57:49,868 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:57:49,868 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1051022291] [2022-11-23 14:57:49,868 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:57:49,869 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:57:49,869 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:57:49,870 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:57:49,882 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-23 14:57:49,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:57:49,933 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 7 conjunts are in the unsatisfiable core [2022-11-23 14:57:49,935 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:57:50,005 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 36 proven. 42 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-11-23 14:57:50,006 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:57:50,081 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 14 proven. 6 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2022-11-23 14:57:50,082 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:57:50,082 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [746113908] [2022-11-23 14:57:50,082 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:57:50,082 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1051022291] [2022-11-23 14:57:50,082 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1051022291] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:57:50,083 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1413833752] [2022-11-23 14:57:50,088 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-23 14:57:50,089 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:57:50,089 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:57:50,089 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:57:50,089 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:57:51,794 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 20 for LOIs [2022-11-23 14:57:51,803 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:57:53,859 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2999#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:57:53,859 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:57:53,860 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:57:53,860 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6] total 10 [2022-11-23 14:57:53,860 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2146861349] [2022-11-23 14:57:53,860 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 14:57:53,866 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-11-23 14:57:53,866 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:57:53,866 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-11-23 14:57:53,867 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=376, Unknown=0, NotChecked=0, Total=462 [2022-11-23 14:57:53,868 INFO L87 Difference]: Start difference. First operand 117 states and 135 transitions. Second operand has 10 states, 10 states have (on average 3.2) internal successors, (32), 10 states have internal predecessors, (32), 5 states have call successors, (15), 4 states have call predecessors, (15), 4 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) [2022-11-23 14:57:54,094 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:57:54,095 INFO L93 Difference]: Finished difference Result 214 states and 247 transitions. [2022-11-23 14:57:54,095 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-23 14:57:54,095 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.2) internal successors, (32), 10 states have internal predecessors, (32), 5 states have call successors, (15), 4 states have call predecessors, (15), 4 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) Word has length 48 [2022-11-23 14:57:54,096 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:57:54,097 INFO L225 Difference]: With dead ends: 214 [2022-11-23 14:57:54,097 INFO L226 Difference]: Without dead ends: 192 [2022-11-23 14:57:54,098 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 119 SyntacticMatches, 3 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 201 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=105, Invalid=495, Unknown=0, NotChecked=0, Total=600 [2022-11-23 14:57:54,098 INFO L413 NwaCegarLoop]: 47 mSDtfsCounter, 102 mSDsluCounter, 129 mSDsCounter, 0 mSdLazyCounter, 119 mSolverCounterSat, 59 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 102 SdHoareTripleChecker+Valid, 176 SdHoareTripleChecker+Invalid, 178 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 59 IncrementalHoareTripleChecker+Valid, 119 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-23 14:57:54,099 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [102 Valid, 176 Invalid, 178 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [59 Valid, 119 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-23 14:57:54,099 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2022-11-23 14:57:54,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 187. [2022-11-23 14:57:54,136 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 187 states, 120 states have (on average 1.1416666666666666) internal successors, (137), 126 states have internal predecessors, (137), 41 states have call successors, (41), 25 states have call predecessors, (41), 25 states have return successors, (37), 35 states have call predecessors, (37), 37 states have call successors, (37) [2022-11-23 14:57:54,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 215 transitions. [2022-11-23 14:57:54,143 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 215 transitions. Word has length 48 [2022-11-23 14:57:54,145 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:57:54,145 INFO L495 AbstractCegarLoop]: Abstraction has 187 states and 215 transitions. [2022-11-23 14:57:54,145 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 3.2) internal successors, (32), 10 states have internal predecessors, (32), 5 states have call successors, (15), 4 states have call predecessors, (15), 4 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) [2022-11-23 14:57:54,146 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 215 transitions. [2022-11-23 14:57:54,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2022-11-23 14:57:54,157 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:57:54,157 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:57:54,166 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2022-11-23 14:57:54,362 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-23 14:57:54,363 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:57:54,363 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:57:54,363 INFO L85 PathProgramCache]: Analyzing trace with hash -1127123487, now seen corresponding path program 1 times [2022-11-23 14:57:54,363 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:57:54,363 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1186364192] [2022-11-23 14:57:54,363 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:57:54,363 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:57:54,371 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:57:54,372 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1782377832] [2022-11-23 14:57:54,372 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:57:54,372 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:57:54,372 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:57:54,373 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:57:54,393 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-23 14:57:54,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:57:54,435 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 31 conjunts are in the unsatisfiable core [2022-11-23 14:57:54,437 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:57:54,759 INFO L134 CoverageAnalysis]: Checked inductivity of 137 backedges. 15 proven. 31 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2022-11-23 14:57:54,759 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:57:57,230 INFO L134 CoverageAnalysis]: Checked inductivity of 137 backedges. 15 proven. 31 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2022-11-23 14:57:57,230 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:57:57,230 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1186364192] [2022-11-23 14:57:57,230 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:57:57,231 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1782377832] [2022-11-23 14:57:57,231 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1782377832] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:57:57,231 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1075733872] [2022-11-23 14:57:57,237 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-11-23 14:57:57,237 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:57:57,238 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:57:57,238 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:57:57,238 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:58:00,039 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 20 for LOIs [2022-11-23 14:58:00,049 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:58:02,115 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3936#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:58:02,115 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:58:02,116 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:58:02,116 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 15 [2022-11-23 14:58:02,116 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [102182383] [2022-11-23 14:58:02,116 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 14:58:02,117 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-11-23 14:58:02,117 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:58:02,117 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-11-23 14:58:02,117 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=639, Unknown=0, NotChecked=0, Total=756 [2022-11-23 14:58:02,118 INFO L87 Difference]: Start difference. First operand 187 states and 215 transitions. Second operand has 15 states, 15 states have (on average 2.466666666666667) internal successors, (37), 13 states have internal predecessors, (37), 7 states have call successors, (18), 3 states have call predecessors, (18), 2 states have return successors, (16), 4 states have call predecessors, (16), 5 states have call successors, (16) [2022-11-23 14:58:04,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:58:04,373 INFO L93 Difference]: Finished difference Result 227 states and 254 transitions. [2022-11-23 14:58:04,373 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-23 14:58:04,374 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.466666666666667) internal successors, (37), 13 states have internal predecessors, (37), 7 states have call successors, (18), 3 states have call predecessors, (18), 2 states have return successors, (16), 4 states have call predecessors, (16), 5 states have call successors, (16) Word has length 56 [2022-11-23 14:58:04,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:58:04,375 INFO L225 Difference]: With dead ends: 227 [2022-11-23 14:58:04,376 INFO L226 Difference]: Without dead ends: 223 [2022-11-23 14:58:04,376 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 171 GetRequests, 137 SyntacticMatches, 3 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 312 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=164, Invalid=892, Unknown=0, NotChecked=0, Total=1056 [2022-11-23 14:58:04,377 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 54 mSDsluCounter, 105 mSDsCounter, 0 mSdLazyCounter, 380 mSolverCounterSat, 69 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 130 SdHoareTripleChecker+Invalid, 449 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 69 IncrementalHoareTripleChecker+Valid, 380 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-11-23 14:58:04,377 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [55 Valid, 130 Invalid, 449 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [69 Valid, 380 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-11-23 14:58:04,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 223 states. [2022-11-23 14:58:04,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 223 to 218. [2022-11-23 14:58:04,430 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 218 states, 144 states have (on average 1.1180555555555556) internal successors, (161), 150 states have internal predecessors, (161), 42 states have call successors, (42), 32 states have call predecessors, (42), 31 states have return successors, (38), 35 states have call predecessors, (38), 38 states have call successors, (38) [2022-11-23 14:58:04,432 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 218 states to 218 states and 241 transitions. [2022-11-23 14:58:04,432 INFO L78 Accepts]: Start accepts. Automaton has 218 states and 241 transitions. Word has length 56 [2022-11-23 14:58:04,432 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:58:04,432 INFO L495 AbstractCegarLoop]: Abstraction has 218 states and 241 transitions. [2022-11-23 14:58:04,432 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.466666666666667) internal successors, (37), 13 states have internal predecessors, (37), 7 states have call successors, (18), 3 states have call predecessors, (18), 2 states have return successors, (16), 4 states have call predecessors, (16), 5 states have call successors, (16) [2022-11-23 14:58:04,433 INFO L276 IsEmpty]: Start isEmpty. Operand 218 states and 241 transitions. [2022-11-23 14:58:04,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-11-23 14:58:04,434 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:58:04,434 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:58:04,442 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-23 14:58:04,637 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:58:04,638 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:58:04,638 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:58:04,638 INFO L85 PathProgramCache]: Analyzing trace with hash -143001442, now seen corresponding path program 1 times [2022-11-23 14:58:04,638 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:58:04,638 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [401988099] [2022-11-23 14:58:04,638 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:58:04,638 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:58:04,646 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:58:04,647 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1463230847] [2022-11-23 14:58:04,647 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:58:04,647 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:58:04,647 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:58:04,648 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:58:04,656 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-23 14:58:04,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:58:04,717 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 33 conjunts are in the unsatisfiable core [2022-11-23 14:58:04,719 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:58:05,038 INFO L134 CoverageAnalysis]: Checked inductivity of 211 backedges. 19 proven. 39 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2022-11-23 14:58:05,038 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:58:05,689 INFO L134 CoverageAnalysis]: Checked inductivity of 211 backedges. 19 proven. 39 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2022-11-23 14:58:05,689 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:58:05,689 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [401988099] [2022-11-23 14:58:05,689 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:58:05,689 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1463230847] [2022-11-23 14:58:05,689 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1463230847] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:58:05,689 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [825787840] [2022-11-23 14:58:05,691 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-23 14:58:05,691 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:58:05,692 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:58:05,692 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:58:05,692 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:58:08,264 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 20 for LOIs [2022-11-23 14:58:08,275 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:58:10,235 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5004#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:58:10,235 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:58:10,235 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:58:10,235 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 17 [2022-11-23 14:58:10,235 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [289070877] [2022-11-23 14:58:10,235 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 14:58:10,236 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-11-23 14:58:10,236 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:58:10,236 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-11-23 14:58:10,237 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=150, Invalid=780, Unknown=0, NotChecked=0, Total=930 [2022-11-23 14:58:10,237 INFO L87 Difference]: Start difference. First operand 218 states and 241 transitions. Second operand has 17 states, 15 states have (on average 2.6) internal successors, (39), 15 states have internal predecessors, (39), 9 states have call successors, (22), 3 states have call predecessors, (22), 2 states have return successors, (20), 6 states have call predecessors, (20), 7 states have call successors, (20) [2022-11-23 14:58:13,043 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 14:58:13,174 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:58:13,174 INFO L93 Difference]: Finished difference Result 241 states and 268 transitions. [2022-11-23 14:58:13,175 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-23 14:58:13,175 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 15 states have (on average 2.6) internal successors, (39), 15 states have internal predecessors, (39), 9 states have call successors, (22), 3 states have call predecessors, (22), 2 states have return successors, (20), 6 states have call predecessors, (20), 7 states have call successors, (20) Word has length 67 [2022-11-23 14:58:13,176 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:58:13,177 INFO L225 Difference]: With dead ends: 241 [2022-11-23 14:58:13,177 INFO L226 Difference]: Without dead ends: 214 [2022-11-23 14:58:13,178 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 204 GetRequests, 166 SyntacticMatches, 4 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 413 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=207, Invalid=1053, Unknown=0, NotChecked=0, Total=1260 [2022-11-23 14:58:13,178 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 62 mSDsluCounter, 98 mSDsCounter, 0 mSdLazyCounter, 406 mSolverCounterSat, 70 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 123 SdHoareTripleChecker+Invalid, 477 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 70 IncrementalHoareTripleChecker+Valid, 406 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2022-11-23 14:58:13,178 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [63 Valid, 123 Invalid, 477 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [70 Valid, 406 Invalid, 1 Unknown, 0 Unchecked, 2.5s Time] [2022-11-23 14:58:13,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 214 states. [2022-11-23 14:58:13,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 214 to 196. [2022-11-23 14:58:13,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 196 states, 130 states have (on average 1.1307692307692307) internal successors, (147), 133 states have internal predecessors, (147), 37 states have call successors, (37), 29 states have call predecessors, (37), 28 states have return successors, (34), 33 states have call predecessors, (34), 34 states have call successors, (34) [2022-11-23 14:58:13,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 218 transitions. [2022-11-23 14:58:13,236 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 218 transitions. Word has length 67 [2022-11-23 14:58:13,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:58:13,236 INFO L495 AbstractCegarLoop]: Abstraction has 196 states and 218 transitions. [2022-11-23 14:58:13,237 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 15 states have (on average 2.6) internal successors, (39), 15 states have internal predecessors, (39), 9 states have call successors, (22), 3 states have call predecessors, (22), 2 states have return successors, (20), 6 states have call predecessors, (20), 7 states have call successors, (20) [2022-11-23 14:58:13,237 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 218 transitions. [2022-11-23 14:58:13,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2022-11-23 14:58:13,238 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:58:13,238 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:58:13,250 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-23 14:58:13,444 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:58:13,444 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:58:13,445 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:58:13,445 INFO L85 PathProgramCache]: Analyzing trace with hash -319401384, now seen corresponding path program 1 times [2022-11-23 14:58:13,446 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:58:13,446 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1510731233] [2022-11-23 14:58:13,446 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:58:13,446 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:58:13,462 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:58:13,466 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2119210170] [2022-11-23 14:58:13,466 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:58:13,467 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:58:13,467 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:58:13,468 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:58:13,485 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-23 14:58:13,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:58:13,533 INFO L263 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-23 14:58:13,535 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:58:13,590 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 84 proven. 0 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2022-11-23 14:58:13,590 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 14:58:13,591 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:58:13,591 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1510731233] [2022-11-23 14:58:13,591 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:58:13,591 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2119210170] [2022-11-23 14:58:13,591 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2119210170] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:58:13,591 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 14:58:13,591 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-23 14:58:13,592 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1477800837] [2022-11-23 14:58:13,592 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:58:13,594 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-23 14:58:13,594 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:58:13,595 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-23 14:58:13,595 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2022-11-23 14:58:13,595 INFO L87 Difference]: Start difference. First operand 196 states and 218 transitions. Second operand has 5 states, 5 states have (on average 4.2) internal successors, (21), 5 states have internal predecessors, (21), 4 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2022-11-23 14:58:13,697 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:58:13,698 INFO L93 Difference]: Finished difference Result 215 states and 237 transitions. [2022-11-23 14:58:13,698 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-23 14:58:13,698 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.2) internal successors, (21), 5 states have internal predecessors, (21), 4 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 77 [2022-11-23 14:58:13,700 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:58:13,702 INFO L225 Difference]: With dead ends: 215 [2022-11-23 14:58:13,702 INFO L226 Difference]: Without dead ends: 185 [2022-11-23 14:58:13,703 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2022-11-23 14:58:13,704 INFO L413 NwaCegarLoop]: 49 mSDtfsCounter, 13 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 89 SdHoareTripleChecker+Invalid, 39 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-23 14:58:13,705 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 89 Invalid, 39 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-23 14:58:13,706 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185 states. [2022-11-23 14:58:13,770 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 185 to 182. [2022-11-23 14:58:13,771 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 182 states, 122 states have (on average 1.098360655737705) internal successors, (134), 124 states have internal predecessors, (134), 33 states have call successors, (33), 26 states have call predecessors, (33), 26 states have return successors, (32), 31 states have call predecessors, (32), 32 states have call successors, (32) [2022-11-23 14:58:13,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 199 transitions. [2022-11-23 14:58:13,773 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 199 transitions. Word has length 77 [2022-11-23 14:58:13,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:58:13,774 INFO L495 AbstractCegarLoop]: Abstraction has 182 states and 199 transitions. [2022-11-23 14:58:13,774 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.2) internal successors, (21), 5 states have internal predecessors, (21), 4 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2022-11-23 14:58:13,774 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 199 transitions. [2022-11-23 14:58:13,775 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-11-23 14:58:13,775 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:58:13,775 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2022-11-23 14:58:13,786 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-23 14:58:13,981 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-11-23 14:58:13,981 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:58:13,982 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:58:13,982 INFO L85 PathProgramCache]: Analyzing trace with hash -1379671488, now seen corresponding path program 2 times [2022-11-23 14:58:13,982 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:58:13,982 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2079906512] [2022-11-23 14:58:13,982 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:58:13,983 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:58:13,993 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:58:13,994 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1222692374] [2022-11-23 14:58:13,994 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 14:58:14,008 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:58:14,008 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:58:14,009 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:58:14,033 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-23 14:58:14,074 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-23 14:58:14,074 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:58:14,075 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 31 conjunts are in the unsatisfiable core [2022-11-23 14:58:14,077 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:58:14,340 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 41 proven. 38 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2022-11-23 14:58:14,340 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:58:15,636 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 41 proven. 32 refuted. 0 times theorem prover too weak. 237 trivial. 0 not checked. [2022-11-23 14:58:15,636 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:58:15,636 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2079906512] [2022-11-23 14:58:15,636 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:58:15,637 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1222692374] [2022-11-23 14:58:15,637 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1222692374] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:58:15,637 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1450479001] [2022-11-23 14:58:15,639 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-11-23 14:58:15,639 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:58:15,640 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:58:15,640 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:58:15,640 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:58:17,933 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 20 for LOIs [2022-11-23 14:58:17,942 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:58:19,593 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6925#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:58:19,593 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:58:19,594 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:58:19,594 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9] total 17 [2022-11-23 14:58:19,594 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [511791212] [2022-11-23 14:58:19,594 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 14:58:19,594 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-11-23 14:58:19,595 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:58:19,595 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-11-23 14:58:19,595 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=137, Invalid=733, Unknown=0, NotChecked=0, Total=870 [2022-11-23 14:58:19,596 INFO L87 Difference]: Start difference. First operand 182 states and 199 transitions. Second operand has 17 states, 17 states have (on average 2.411764705882353) internal successors, (41), 16 states have internal predecessors, (41), 9 states have call successors, (23), 3 states have call predecessors, (23), 2 states have return successors, (21), 7 states have call predecessors, (21), 9 states have call successors, (21) [2022-11-23 14:58:25,627 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.31s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 14:58:26,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:58:26,449 INFO L93 Difference]: Finished difference Result 199 states and 223 transitions. [2022-11-23 14:58:26,450 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-23 14:58:26,450 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.411764705882353) internal successors, (41), 16 states have internal predecessors, (41), 9 states have call successors, (23), 3 states have call predecessors, (23), 2 states have return successors, (21), 7 states have call predecessors, (21), 9 states have call successors, (21) Word has length 79 [2022-11-23 14:58:26,450 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:58:26,451 INFO L225 Difference]: With dead ends: 199 [2022-11-23 14:58:26,451 INFO L226 Difference]: Without dead ends: 197 [2022-11-23 14:58:26,452 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 238 GetRequests, 201 SyntacticMatches, 6 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 373 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=168, Invalid=888, Unknown=0, NotChecked=0, Total=1056 [2022-11-23 14:58:26,452 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 61 mSDsluCounter, 140 mSDsCounter, 0 mSdLazyCounter, 445 mSolverCounterSat, 78 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 171 SdHoareTripleChecker+Invalid, 523 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 78 IncrementalHoareTripleChecker+Valid, 445 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2022-11-23 14:58:26,452 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [69 Valid, 171 Invalid, 523 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [78 Valid, 445 Invalid, 0 Unknown, 0 Unchecked, 2.3s Time] [2022-11-23 14:58:26,453 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2022-11-23 14:58:26,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 193. [2022-11-23 14:58:26,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 193 states, 128 states have (on average 1.1015625) internal successors, (141), 131 states have internal predecessors, (141), 37 states have call successors, (37), 27 states have call predecessors, (37), 27 states have return successors, (36), 34 states have call predecessors, (36), 36 states have call successors, (36) [2022-11-23 14:58:26,525 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 214 transitions. [2022-11-23 14:58:26,525 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 214 transitions. Word has length 79 [2022-11-23 14:58:26,525 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:58:26,525 INFO L495 AbstractCegarLoop]: Abstraction has 193 states and 214 transitions. [2022-11-23 14:58:26,526 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.411764705882353) internal successors, (41), 16 states have internal predecessors, (41), 9 states have call successors, (23), 3 states have call predecessors, (23), 2 states have return successors, (21), 7 states have call predecessors, (21), 9 states have call successors, (21) [2022-11-23 14:58:26,526 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 214 transitions. [2022-11-23 14:58:26,527 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2022-11-23 14:58:26,527 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:58:26,527 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1] [2022-11-23 14:58:26,534 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-23 14:58:26,732 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-11-23 14:58:26,732 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:58:26,733 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:58:26,733 INFO L85 PathProgramCache]: Analyzing trace with hash 1528689375, now seen corresponding path program 3 times [2022-11-23 14:58:26,733 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:58:26,733 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1247280513] [2022-11-23 14:58:26,733 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:58:26,733 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:58:26,742 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:58:26,743 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1754963289] [2022-11-23 14:58:26,743 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 14:58:26,743 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:58:26,743 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:58:26,744 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:58:26,746 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-23 14:58:26,815 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 14:58:26,815 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:58:26,817 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 61 conjunts are in the unsatisfiable core [2022-11-23 14:58:26,820 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:59:24,256 WARN L837 $PredicateComparison]: unable to prove that (or (and (= |c___VERIFIER_assert_#in~cond| 0) (exists ((|aux_div_aux_mod_v_ULTIMATE.start_main_~p~0#1_80_49_56| Int) (|aux_div_v_ULTIMATE.start_main_~p~0#1_80_49| Int) (|aux_div_aux_mod_aux_mod_v_ULTIMATE.start_main_~p~0#1_80_49_56_67| Int) (|v_ULTIMATE.start_main_~B~0#1_BEFORE_CALL_344| Int) (|aux_div_v_ULTIMATE.start_main_~p~0#1_81_41| Int) (|v_ULTIMATE.start_main_~q~0#1_BEFORE_CALL_338| Int)) (let ((.cse0 (* |aux_div_v_ULTIMATE.start_main_~p~0#1_80_49| |v_ULTIMATE.start_main_~B~0#1_BEFORE_CALL_344|)) (.cse1 (* |v_ULTIMATE.start_main_~q~0#1_BEFORE_CALL_338| |v_ULTIMATE.start_main_~B~0#1_BEFORE_CALL_344|)) (.cse6 (* |aux_div_v_ULTIMATE.start_main_~p~0#1_81_41| 3)) (.cse5 (* |v_ULTIMATE.start_main_~q~0#1_BEFORE_CALL_338| 2)) (.cse2 (* |aux_div_v_ULTIMATE.start_main_~p~0#1_81_41| 2)) (.cse3 (* |aux_div_aux_mod_v_ULTIMATE.start_main_~p~0#1_80_49_56| 4)) (.cse4 (* |aux_div_v_ULTIMATE.start_main_~p~0#1_80_49| 4))) (and (<= |v_ULTIMATE.start_main_~q~0#1_BEFORE_CALL_338| (+ |aux_div_v_ULTIMATE.start_main_~p~0#1_81_41| (* |aux_div_v_ULTIMATE.start_main_~p~0#1_80_49| 2) (* 2 |aux_div_aux_mod_v_ULTIMATE.start_main_~p~0#1_80_49_56|))) (not (= (* 3 .cse0) .cse1)) (= (+ (* 2 .cse0) (* |aux_div_v_ULTIMATE.start_main_~p~0#1_81_41| |v_ULTIMATE.start_main_~B~0#1_BEFORE_CALL_344|)) .cse1) (< (+ .cse2 .cse3 .cse4) (+ .cse5 4)) (< |v_ULTIMATE.start_main_~q~0#1_BEFORE_CALL_338| (+ .cse6 2)) (<= .cse6 |v_ULTIMATE.start_main_~q~0#1_BEFORE_CALL_338|) (<= .cse5 (+ .cse2 .cse3 .cse4 (* |aux_div_aux_mod_aux_mod_v_ULTIMATE.start_main_~p~0#1_80_49_56_67| 4))))))) (= |c___VERIFIER_assert_#in~cond| 1)) is different from false [2022-11-23 14:59:40,271 INFO L134 CoverageAnalysis]: Checked inductivity of 367 backedges. 115 proven. 66 refuted. 0 times theorem prover too weak. 186 trivial. 0 not checked. [2022-11-23 14:59:40,271 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:00:07,267 WARN L859 $PredicateComparison]: unable to prove that (or (not (= (* |c_ULTIMATE.start_main_~p~0#1| |c_ULTIMATE.start_main_~B~0#1|) |c_ULTIMATE.start_main_~d~0#1|)) (let ((.cse12 (* |c_ULTIMATE.start_main_~B~0#1| |c_ULTIMATE.start_main_~q~0#1|)) (.cse16 (div |c_ULTIMATE.start_main_~d~0#1| 2))) (let ((.cse17 (<= (+ .cse16 1) |c_ULTIMATE.start_main_~r~0#1|)) (.cse15 (< |c_ULTIMATE.start_main_~d~0#1| 0)) (.cse2 (= (mod |c_ULTIMATE.start_main_~d~0#1| 2) 0)) (.cse19 (<= .cse16 |c_ULTIMATE.start_main_~r~0#1|)) (.cse18 (= |c_ULTIMATE.start_main_~A~0#1| (+ .cse12 |c_ULTIMATE.start_main_~r~0#1|)))) (let ((.cse1 (< |c_ULTIMATE.start_main_~p~0#1| 0)) (.cse8 (or .cse19 .cse18)) (.cse9 (not .cse19)) (.cse10 (+ .cse16 |c_ULTIMATE.start_main_~A~0#1|)) (.cse11 (and .cse15 (not .cse2))) (.cse3 (or .cse17 .cse18)) (.cse4 (not .cse17)) (.cse5 (+ .cse16 |c_ULTIMATE.start_main_~A~0#1| 1)) (.cse7 (not .cse15)) (.cse13 (* (div |c_ULTIMATE.start_main_~p~0#1| 2) |c_ULTIMATE.start_main_~B~0#1|)) (.cse0 (= (mod |c_ULTIMATE.start_main_~p~0#1| 2) 0))) (and (or (and (not .cse0) .cse1) (let ((.cse6 (+ .cse12 |c_ULTIMATE.start_main_~r~0#1| .cse13))) (and (or .cse2 (and .cse3 (or .cse4 (= .cse5 .cse6))) .cse7) (or (and .cse8 (or .cse9 (= .cse10 .cse6))) .cse11)))) (or (not .cse1) (let ((.cse14 (+ .cse12 |c_ULTIMATE.start_main_~r~0#1| |c_ULTIMATE.start_main_~B~0#1| .cse13))) (and (or (and .cse8 (or .cse9 (= .cse10 .cse14))) .cse11) (or (and .cse3 (or .cse4 (= .cse5 .cse14))) .cse2 .cse7))) .cse0)))))) is different from true [2022-11-23 15:01:23,362 WARN L233 SmtUtils]: Spent 24.19s on a formula simplification that was a NOOP. DAG size: 120 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 15:01:59,320 WARN L233 SmtUtils]: Spent 11.44s on a formula simplification that was a NOOP. DAG size: 65 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 15:03:16,647 INFO L134 CoverageAnalysis]: Checked inductivity of 367 backedges. 133 proven. 29 refuted. 0 times theorem prover too weak. 204 trivial. 1 not checked. [2022-11-23 15:03:16,647 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:03:16,647 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1247280513] [2022-11-23 15:03:16,647 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 15:03:16,647 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1754963289] [2022-11-23 15:03:16,648 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1754963289] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:03:16,648 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [973942406] [2022-11-23 15:03:16,649 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-11-23 15:03:16,650 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:03:16,650 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:03:16,650 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:03:16,650 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:03:18,934 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 20 for LOIs [2022-11-23 15:03:18,944 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:03:31,885 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8042#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 15:03:31,885 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:03:31,886 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 15:03:31,886 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 26 [2022-11-23 15:03:31,886 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [515129758] [2022-11-23 15:03:31,886 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 15:03:31,887 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-23 15:03:31,887 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:03:31,887 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-23 15:03:31,888 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=236, Invalid=1095, Unknown=9, NotChecked=142, Total=1482 [2022-11-23 15:03:31,888 INFO L87 Difference]: Start difference. First operand 193 states and 214 transitions. Second operand has 26 states, 24 states have (on average 1.9166666666666667) internal successors, (46), 17 states have internal predecessors, (46), 15 states have call successors, (26), 3 states have call predecessors, (26), 2 states have return successors, (25), 14 states have call predecessors, (25), 13 states have call successors, (25) [2022-11-23 15:04:23,129 WARN L233 SmtUtils]: Spent 40.31s on a formula simplification. DAG size of input: 171 DAG size of output: 107 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 15:04:30,506 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 15:04:33,353 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.55s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 15:04:36,652 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.61s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 15:04:47,056 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 15:04:49,309 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.47s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 15:04:51,313 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 15:05:05,736 WARN L233 SmtUtils]: Spent 12.52s on a formula simplification. DAG size of input: 122 DAG size of output: 28 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 15:05:23,728 WARN L233 SmtUtils]: Spent 14.67s on a formula simplification. DAG size of input: 163 DAG size of output: 32 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 15:05:26,548 WARN L539 Checker$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 15:05:28,941 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.40s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 15:05:30,404 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.46s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 15:05:32,778 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.84s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 15:05:34,782 WARN L539 Checker$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 15:05:36,916 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 15:05:42,394 WARN L539 Checker$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 15:05:44,010 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.61s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 15:05:46,215 WARN L539 Checker$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 15:05:48,708 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 15:05:50,830 WARN L539 Checker$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 15:05:52,838 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 15:06:06,718 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.03s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 15:06:10,512 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.11s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 15:06:12,341 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.83s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 15:06:13,864 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.14s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 15:06:16,021 WARN L539 Checker$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 15:06:18,081 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [0] [2022-11-23 15:06:19,420 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.33s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [0] [2022-11-23 15:06:21,279 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.72s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [0] [2022-11-23 15:06:39,753 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.40s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 15:06:45,026 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.77s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 15:06:49,431 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [0] [2022-11-23 15:08:18,181 WARN L233 SmtUtils]: Spent 1.38m on a formula simplification. DAG size of input: 183 DAG size of output: 179 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 15:08:22,633 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.64s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [0] [2022-11-23 15:08:24,635 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [0] [2022-11-23 15:08:27,803 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 15:08:29,420 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.28s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 15:09:08,508 WARN L233 SmtUtils]: Spent 29.01s on a formula simplification. DAG size of input: 124 DAG size of output: 32 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 15:09:10,178 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.67s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 15:09:11,400 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.22s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 15:09:12,471 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.07s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 15:09:14,633 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.81s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 15:09:17,163 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 15:09:28,015 WARN L233 SmtUtils]: Spent 5.49s on a formula simplification. DAG size of input: 105 DAG size of output: 85 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 15:09:30,170 WARN L539 Checker$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 15:09:31,208 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.04s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 15:09:33,126 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.92s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 15:09:35,264 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.85s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 15:09:37,227 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.47s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 15:09:39,727 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 15:09:41,414 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.66s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 15:10:00,777 WARN L233 SmtUtils]: Spent 7.59s on a formula simplification that was a NOOP. DAG size: 91 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 15:10:18,400 WARN L233 SmtUtils]: Spent 6.89s on a formula simplification. DAG size of input: 121 DAG size of output: 84 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 15:10:22,323 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 15:10:24,132 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.81s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 15:11:10,230 WARN L233 SmtUtils]: Spent 39.66s on a formula simplification. DAG size of input: 160 DAG size of output: 141 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 15:12:17,864 WARN L233 SmtUtils]: Spent 47.18s on a formula simplification. DAG size of input: 141 DAG size of output: 119 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 15:12:18,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:12:18,231 INFO L93 Difference]: Finished difference Result 258 states and 304 transitions. [2022-11-23 15:12:18,232 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-11-23 15:12:18,232 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 24 states have (on average 1.9166666666666667) internal successors, (46), 17 states have internal predecessors, (46), 15 states have call successors, (26), 3 states have call predecessors, (26), 2 states have return successors, (25), 14 states have call predecessors, (25), 13 states have call successors, (25) Word has length 87 [2022-11-23 15:12:18,232 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:12:18,233 INFO L225 Difference]: With dead ends: 258 [2022-11-23 15:12:18,234 INFO L226 Difference]: Without dead ends: 251 [2022-11-23 15:12:18,235 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 284 GetRequests, 217 SyntacticMatches, 12 SemanticMatches, 55 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 1134 ImplicationChecksByTransitivity, 518.6s TimeCoverageRelationStatistics Valid=524, Invalid=2427, Unknown=27, NotChecked=214, Total=3192 [2022-11-23 15:12:18,235 INFO L413 NwaCegarLoop]: 48 mSDtfsCounter, 99 mSDsluCounter, 230 mSDsCounter, 0 mSdLazyCounter, 808 mSolverCounterSat, 178 mSolverCounterUnsat, 20 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 118.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 104 SdHoareTripleChecker+Valid, 278 SdHoareTripleChecker+Invalid, 1221 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 178 IncrementalHoareTripleChecker+Valid, 808 IncrementalHoareTripleChecker+Invalid, 20 IncrementalHoareTripleChecker+Unknown, 215 IncrementalHoareTripleChecker+Unchecked, 119.1s IncrementalHoareTripleChecker+Time [2022-11-23 15:12:18,236 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [104 Valid, 278 Invalid, 1221 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [178 Valid, 808 Invalid, 20 Unknown, 215 Unchecked, 119.1s Time] [2022-11-23 15:12:18,236 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 251 states. [2022-11-23 15:12:18,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 251 to 218. [2022-11-23 15:12:18,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 218 states, 145 states have (on average 1.1172413793103448) internal successors, (162), 150 states have internal predecessors, (162), 44 states have call successors, (44), 29 states have call predecessors, (44), 28 states have return successors, (42), 38 states have call predecessors, (42), 42 states have call successors, (42) [2022-11-23 15:12:18,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 218 states to 218 states and 248 transitions. [2022-11-23 15:12:18,329 INFO L78 Accepts]: Start accepts. Automaton has 218 states and 248 transitions. Word has length 87 [2022-11-23 15:12:18,329 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:12:18,330 INFO L495 AbstractCegarLoop]: Abstraction has 218 states and 248 transitions. [2022-11-23 15:12:18,330 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 24 states have (on average 1.9166666666666667) internal successors, (46), 17 states have internal predecessors, (46), 15 states have call successors, (26), 3 states have call predecessors, (26), 2 states have return successors, (25), 14 states have call predecessors, (25), 13 states have call successors, (25) [2022-11-23 15:12:18,330 INFO L276 IsEmpty]: Start isEmpty. Operand 218 states and 248 transitions. [2022-11-23 15:12:18,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2022-11-23 15:12:18,331 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:12:18,331 INFO L195 NwaCegarLoop]: trace histogram [15, 14, 14, 5, 4, 4, 4, 4, 4, 4, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:12:18,335 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-11-23 15:12:18,531 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:12:18,532 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:12:18,532 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:12:18,532 INFO L85 PathProgramCache]: Analyzing trace with hash 1631100676, now seen corresponding path program 1 times [2022-11-23 15:12:18,532 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:12:18,532 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [885260553] [2022-11-23 15:12:18,532 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:12:18,532 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:12:18,541 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 15:12:18,541 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1553285680] [2022-11-23 15:12:18,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:12:18,541 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:12:18,542 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:12:18,543 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:12:18,548 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-23 15:12:18,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:12:18,622 INFO L263 TraceCheckSpWp]: Trace formula consists of 251 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-23 15:12:18,624 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:12:18,779 INFO L134 CoverageAnalysis]: Checked inductivity of 438 backedges. 120 proven. 260 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2022-11-23 15:12:18,780 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:12:18,931 INFO L134 CoverageAnalysis]: Checked inductivity of 438 backedges. 28 proven. 44 refuted. 0 times theorem prover too weak. 366 trivial. 0 not checked. [2022-11-23 15:12:18,932 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:12:18,932 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [885260553] [2022-11-23 15:12:18,932 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 15:12:18,932 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1553285680] [2022-11-23 15:12:18,932 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1553285680] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:12:18,932 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [849998647] [2022-11-23 15:12:18,934 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-23 15:12:18,934 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:12:18,934 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:12:18,935 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:12:18,935 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:12:20,443 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 25 for LOIs [2022-11-23 15:12:20,463 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:12:22,079 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9361#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2022-11-23 15:12:22,079 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:12:22,079 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 15:12:22,079 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8] total 14 [2022-11-23 15:12:22,079 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2025559501] [2022-11-23 15:12:22,079 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 15:12:22,080 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-23 15:12:22,080 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:12:22,080 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-23 15:12:22,081 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=522, Unknown=0, NotChecked=0, Total=650 [2022-11-23 15:12:22,081 INFO L87 Difference]: Start difference. First operand 218 states and 248 transitions. Second operand has 14 states, 14 states have (on average 3.857142857142857) internal successors, (54), 14 states have internal predecessors, (54), 9 states have call successors, (29), 6 states have call predecessors, (29), 6 states have return successors, (28), 9 states have call predecessors, (28), 9 states have call successors, (28) [2022-11-23 15:12:22,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:12:22,807 INFO L93 Difference]: Finished difference Result 516 states and 585 transitions. [2022-11-23 15:12:22,809 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-11-23 15:12:22,810 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.857142857142857) internal successors, (54), 14 states have internal predecessors, (54), 9 states have call successors, (29), 6 states have call predecessors, (29), 6 states have return successors, (28), 9 states have call predecessors, (28), 9 states have call successors, (28) Word has length 94 [2022-11-23 15:12:22,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:12:22,813 INFO L225 Difference]: With dead ends: 516 [2022-11-23 15:12:22,813 INFO L226 Difference]: Without dead ends: 465 [2022-11-23 15:12:22,826 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 289 GetRequests, 252 SyntacticMatches, 4 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 394 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=241, Invalid=949, Unknown=0, NotChecked=0, Total=1190 [2022-11-23 15:12:22,826 INFO L413 NwaCegarLoop]: 67 mSDtfsCounter, 176 mSDsluCounter, 169 mSDsCounter, 0 mSdLazyCounter, 189 mSolverCounterSat, 96 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 176 SdHoareTripleChecker+Valid, 236 SdHoareTripleChecker+Invalid, 285 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 96 IncrementalHoareTripleChecker+Valid, 189 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-23 15:12:22,827 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [176 Valid, 236 Invalid, 285 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [96 Valid, 189 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-23 15:12:22,829 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 465 states. [2022-11-23 15:12:23,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 465 to 451. [2022-11-23 15:12:23,012 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 451 states, 293 states have (on average 1.129692832764505) internal successors, (331), 312 states have internal predecessors, (331), 94 states have call successors, (94), 64 states have call predecessors, (94), 63 states have return successors, (85), 74 states have call predecessors, (85), 85 states have call successors, (85) [2022-11-23 15:12:23,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 451 states to 451 states and 510 transitions. [2022-11-23 15:12:23,015 INFO L78 Accepts]: Start accepts. Automaton has 451 states and 510 transitions. Word has length 94 [2022-11-23 15:12:23,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:12:23,016 INFO L495 AbstractCegarLoop]: Abstraction has 451 states and 510 transitions. [2022-11-23 15:12:23,016 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 3.857142857142857) internal successors, (54), 14 states have internal predecessors, (54), 9 states have call successors, (29), 6 states have call predecessors, (29), 6 states have return successors, (28), 9 states have call predecessors, (28), 9 states have call successors, (28) [2022-11-23 15:12:23,016 INFO L276 IsEmpty]: Start isEmpty. Operand 451 states and 510 transitions. [2022-11-23 15:12:23,018 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2022-11-23 15:12:23,018 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:12:23,018 INFO L195 NwaCegarLoop]: trace histogram [16, 15, 15, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1] [2022-11-23 15:12:23,024 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-11-23 15:12:23,224 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-11-23 15:12:23,224 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:12:23,224 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:12:23,224 INFO L85 PathProgramCache]: Analyzing trace with hash 1611272416, now seen corresponding path program 2 times [2022-11-23 15:12:23,224 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:12:23,224 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [346320316] [2022-11-23 15:12:23,224 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:12:23,225 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:12:23,234 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 15:12:23,234 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1804216737] [2022-11-23 15:12:23,234 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 15:12:23,234 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:12:23,235 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:12:23,236 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:12:23,241 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-23 15:12:23,318 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-23 15:12:23,318 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:12:23,319 INFO L263 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 29 conjunts are in the unsatisfiable core [2022-11-23 15:12:23,320 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:12:23,508 INFO L134 CoverageAnalysis]: Checked inductivity of 483 backedges. 113 proven. 41 refuted. 0 times theorem prover too weak. 329 trivial. 0 not checked. [2022-11-23 15:12:23,508 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:12:23,739 INFO L134 CoverageAnalysis]: Checked inductivity of 483 backedges. 110 proven. 2 refuted. 0 times theorem prover too weak. 371 trivial. 0 not checked. [2022-11-23 15:12:23,739 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:12:23,739 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [346320316] [2022-11-23 15:12:23,739 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 15:12:23,739 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1804216737] [2022-11-23 15:12:23,739 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1804216737] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:12:23,740 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1052256836] [2022-11-23 15:12:23,741 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-23 15:12:23,741 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:12:23,742 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:12:23,742 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:12:23,742 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:12:26,222 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 20 for LOIs [2022-11-23 15:12:26,233 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:12:28,517 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11370#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 15:12:28,517 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:12:28,517 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 15:12:28,517 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 8] total 16 [2022-11-23 15:12:28,517 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1653786553] [2022-11-23 15:12:28,517 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 15:12:28,518 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-11-23 15:12:28,518 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:12:28,518 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-11-23 15:12:28,519 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=729, Unknown=0, NotChecked=0, Total=870 [2022-11-23 15:12:28,519 INFO L87 Difference]: Start difference. First operand 451 states and 510 transitions. Second operand has 16 states, 12 states have (on average 2.8333333333333335) internal successors, (34), 11 states have internal predecessors, (34), 7 states have call successors, (17), 3 states have call predecessors, (17), 2 states have return successors, (18), 7 states have call predecessors, (18), 5 states have call successors, (18) [2022-11-23 15:12:29,564 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:12:29,565 INFO L93 Difference]: Finished difference Result 481 states and 543 transitions. [2022-11-23 15:12:29,565 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-23 15:12:29,565 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 12 states have (on average 2.8333333333333335) internal successors, (34), 11 states have internal predecessors, (34), 7 states have call successors, (17), 3 states have call predecessors, (17), 2 states have return successors, (18), 7 states have call predecessors, (18), 5 states have call successors, (18) Word has length 98 [2022-11-23 15:12:29,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:12:29,568 INFO L225 Difference]: With dead ends: 481 [2022-11-23 15:12:29,568 INFO L226 Difference]: Without dead ends: 465 [2022-11-23 15:12:29,569 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 301 GetRequests, 263 SyntacticMatches, 3 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 407 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=218, Invalid=1114, Unknown=0, NotChecked=0, Total=1332 [2022-11-23 15:12:29,569 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 88 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 173 mSolverCounterSat, 102 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 88 SdHoareTripleChecker+Valid, 64 SdHoareTripleChecker+Invalid, 275 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 102 IncrementalHoareTripleChecker+Valid, 173 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-23 15:12:29,570 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [88 Valid, 64 Invalid, 275 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [102 Valid, 173 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-23 15:12:29,571 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 465 states. [2022-11-23 15:12:29,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 465 to 365. [2022-11-23 15:12:29,772 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 365 states, 242 states have (on average 1.0950413223140496) internal successors, (265), 253 states have internal predecessors, (265), 69 states have call successors, (69), 53 states have call predecessors, (69), 53 states have return successors, (67), 58 states have call predecessors, (67), 67 states have call successors, (67) [2022-11-23 15:12:29,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 365 states to 365 states and 401 transitions. [2022-11-23 15:12:29,774 INFO L78 Accepts]: Start accepts. Automaton has 365 states and 401 transitions. Word has length 98 [2022-11-23 15:12:29,775 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:12:29,775 INFO L495 AbstractCegarLoop]: Abstraction has 365 states and 401 transitions. [2022-11-23 15:12:29,775 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 12 states have (on average 2.8333333333333335) internal successors, (34), 11 states have internal predecessors, (34), 7 states have call successors, (17), 3 states have call predecessors, (17), 2 states have return successors, (18), 7 states have call predecessors, (18), 5 states have call successors, (18) [2022-11-23 15:12:29,775 INFO L276 IsEmpty]: Start isEmpty. Operand 365 states and 401 transitions. [2022-11-23 15:12:29,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2022-11-23 15:12:29,776 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:12:29,777 INFO L195 NwaCegarLoop]: trace histogram [16, 15, 15, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1] [2022-11-23 15:12:29,790 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-11-23 15:12:29,982 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-11-23 15:12:29,982 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:12:29,983 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:12:29,983 INFO L85 PathProgramCache]: Analyzing trace with hash -417817870, now seen corresponding path program 1 times [2022-11-23 15:12:29,983 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:12:29,983 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1456784851] [2022-11-23 15:12:29,983 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:12:29,983 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:12:29,992 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 15:12:29,996 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [601700908] [2022-11-23 15:12:29,996 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:12:29,996 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:12:29,997 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:12:29,998 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:12:30,002 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47fe4af3-5ac2-45f8-b6c8-7e492e627445/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-23 15:12:30,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:12:30,070 INFO L263 TraceCheckSpWp]: Trace formula consists of 263 conjuncts, 15 conjunts are in the unsatisfiable core [2022-11-23 15:12:30,078 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:12:30,269 INFO L134 CoverageAnalysis]: Checked inductivity of 489 backedges. 30 proven. 411 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2022-11-23 15:12:30,269 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:12:30,472 INFO L134 CoverageAnalysis]: Checked inductivity of 489 backedges. 30 proven. 39 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2022-11-23 15:12:30,473 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:12:30,473 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1456784851] [2022-11-23 15:12:30,473 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 15:12:30,473 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [601700908] [2022-11-23 15:12:30,473 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [601700908] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:12:30,473 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [23962590] [2022-11-23 15:12:30,476 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-23 15:12:30,476 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:12:30,476 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:12:30,476 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:12:30,476 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:12:32,911 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2022-11-23 15:12:32,917 INFO L180 IcfgInterpreter]: Interpretation finished