./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loops-crafted-1/nested3-1_abstracted.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 8393723b 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_fc322b3f-bb7a-42fc-83b3-5579d530fa86/bin/utaipan-I9t0OCRTmS/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fc322b3f-bb7a-42fc-83b3-5579d530fa86/bin/utaipan-I9t0OCRTmS/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fc322b3f-bb7a-42fc-83b3-5579d530fa86/bin/utaipan-I9t0OCRTmS/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fc322b3f-bb7a-42fc-83b3-5579d530fa86/bin/utaipan-I9t0OCRTmS/config/TaipanReach.xml -i ../../sv-benchmarks/c/loops-crafted-1/nested3-1_abstracted.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fc322b3f-bb7a-42fc-83b3-5579d530fa86/bin/utaipan-I9t0OCRTmS/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fc322b3f-bb7a-42fc-83b3-5579d530fa86/bin/utaipan-I9t0OCRTmS --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 898ef25fdb2ae04f56304d500631f410c196b9a77fbfba6f83248dcfc33b301f --- 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-8393723 [2022-11-19 08:15:56,021 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-19 08:15:56,024 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-19 08:15:56,064 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-19 08:15:56,065 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-19 08:15:56,068 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-19 08:15:56,071 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-19 08:15:56,076 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-19 08:15:56,078 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-19 08:15:56,083 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-19 08:15:56,085 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-19 08:15:56,086 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-19 08:15:56,087 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-19 08:15:56,089 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-19 08:15:56,091 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-19 08:15:56,093 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-19 08:15:56,095 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-19 08:15:56,096 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-19 08:15:56,098 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-19 08:15:56,104 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-19 08:15:56,106 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-19 08:15:56,107 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-19 08:15:56,110 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-19 08:15:56,112 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-19 08:15:56,117 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-19 08:15:56,118 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-19 08:15:56,118 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-19 08:15:56,120 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-19 08:15:56,121 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-19 08:15:56,122 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-19 08:15:56,124 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-19 08:15:56,125 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-19 08:15:56,127 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-19 08:15:56,128 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-19 08:15:56,129 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-19 08:15:56,129 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-19 08:15:56,130 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-19 08:15:56,130 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-19 08:15:56,131 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-19 08:15:56,132 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-19 08:15:56,132 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-19 08:15:56,133 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fc322b3f-bb7a-42fc-83b3-5579d530fa86/bin/utaipan-I9t0OCRTmS/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-19 08:15:56,174 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-19 08:15:56,175 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-19 08:15:56,176 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-19 08:15:56,176 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-19 08:15:56,177 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-19 08:15:56,177 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-19 08:15:56,177 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-19 08:15:56,178 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-19 08:15:56,178 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-19 08:15:56,178 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-19 08:15:56,179 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-19 08:15:56,179 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-19 08:15:56,180 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-19 08:15:56,180 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-19 08:15:56,180 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-19 08:15:56,180 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-19 08:15:56,181 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-19 08:15:56,181 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-19 08:15:56,182 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-19 08:15:56,182 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-19 08:15:56,182 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-19 08:15:56,182 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-19 08:15:56,183 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-19 08:15:56,183 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-19 08:15:56,183 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-19 08:15:56,183 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-19 08:15:56,183 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-19 08:15:56,184 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-19 08:15:56,184 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-19 08:15:56,184 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-19 08:15:56,184 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-19 08:15:56,185 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-19 08:15:56,185 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-19 08:15:56,185 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-19 08:15:56,186 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-19 08:15:56,186 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-19 08:15:56,186 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-19 08:15:56,186 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-19 08:15:56,187 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-19 08:15:56,187 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-19 08:15:56,187 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-19 08:15:56,187 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_fc322b3f-bb7a-42fc-83b3-5579d530fa86/bin/utaipan-I9t0OCRTmS/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fc322b3f-bb7a-42fc-83b3-5579d530fa86/bin/utaipan-I9t0OCRTmS Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 898ef25fdb2ae04f56304d500631f410c196b9a77fbfba6f83248dcfc33b301f [2022-11-19 08:15:56,442 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-19 08:15:56,463 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-19 08:15:56,465 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-19 08:15:56,466 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-19 08:15:56,467 INFO L275 PluginConnector]: CDTParser initialized [2022-11-19 08:15:56,468 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fc322b3f-bb7a-42fc-83b3-5579d530fa86/bin/utaipan-I9t0OCRTmS/../../sv-benchmarks/c/loops-crafted-1/nested3-1_abstracted.c [2022-11-19 08:15:56,533 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fc322b3f-bb7a-42fc-83b3-5579d530fa86/bin/utaipan-I9t0OCRTmS/data/819a821da/305da7b944354bb2ba40ac88e5ae3183/FLAG9341ee18f [2022-11-19 08:15:56,945 INFO L306 CDTParser]: Found 1 translation units. [2022-11-19 08:15:56,946 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fc322b3f-bb7a-42fc-83b3-5579d530fa86/sv-benchmarks/c/loops-crafted-1/nested3-1_abstracted.c [2022-11-19 08:15:56,951 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fc322b3f-bb7a-42fc-83b3-5579d530fa86/bin/utaipan-I9t0OCRTmS/data/819a821da/305da7b944354bb2ba40ac88e5ae3183/FLAG9341ee18f [2022-11-19 08:15:57,361 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fc322b3f-bb7a-42fc-83b3-5579d530fa86/bin/utaipan-I9t0OCRTmS/data/819a821da/305da7b944354bb2ba40ac88e5ae3183 [2022-11-19 08:15:57,363 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-19 08:15:57,365 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-19 08:15:57,366 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-19 08:15:57,366 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-19 08:15:57,370 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-19 08:15:57,370 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 08:15:57" (1/1) ... [2022-11-19 08:15:57,371 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7c983f9b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:15:57, skipping insertion in model container [2022-11-19 08:15:57,372 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 08:15:57" (1/1) ... [2022-11-19 08:15:57,382 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-19 08:15:57,397 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-19 08:15:57,570 WARN L234 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_fc322b3f-bb7a-42fc-83b3-5579d530fa86/sv-benchmarks/c/loops-crafted-1/nested3-1_abstracted.c[739,752] [2022-11-19 08:15:57,586 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-19 08:15:57,594 INFO L203 MainTranslator]: Completed pre-run [2022-11-19 08:15:57,604 WARN L234 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_fc322b3f-bb7a-42fc-83b3-5579d530fa86/sv-benchmarks/c/loops-crafted-1/nested3-1_abstracted.c[739,752] [2022-11-19 08:15:57,609 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-19 08:15:57,621 INFO L208 MainTranslator]: Completed translation [2022-11-19 08:15:57,621 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:15:57 WrapperNode [2022-11-19 08:15:57,622 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-19 08:15:57,622 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-19 08:15:57,622 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-19 08:15:57,622 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-19 08:15:57,629 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:15:57" (1/1) ... [2022-11-19 08:15:57,635 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:15:57" (1/1) ... [2022-11-19 08:15:57,653 INFO L138 Inliner]: procedures = 20, calls = 10, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 46 [2022-11-19 08:15:57,654 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-19 08:15:57,655 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-19 08:15:57,655 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-19 08:15:57,655 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-19 08:15:57,664 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:15:57" (1/1) ... [2022-11-19 08:15:57,664 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:15:57" (1/1) ... [2022-11-19 08:15:57,667 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:15:57" (1/1) ... [2022-11-19 08:15:57,667 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:15:57" (1/1) ... [2022-11-19 08:15:57,670 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:15:57" (1/1) ... [2022-11-19 08:15:57,674 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:15:57" (1/1) ... [2022-11-19 08:15:57,675 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:15:57" (1/1) ... [2022-11-19 08:15:57,676 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:15:57" (1/1) ... [2022-11-19 08:15:57,677 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-19 08:15:57,678 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-19 08:15:57,679 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-19 08:15:57,679 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-19 08:15:57,680 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:15:57" (1/1) ... [2022-11-19 08:15:57,686 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-19 08:15:57,698 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fc322b3f-bb7a-42fc-83b3-5579d530fa86/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:15:57,714 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fc322b3f-bb7a-42fc-83b3-5579d530fa86/bin/utaipan-I9t0OCRTmS/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-19 08:15:57,727 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fc322b3f-bb7a-42fc-83b3-5579d530fa86/bin/utaipan-I9t0OCRTmS/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-19 08:15:57,755 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-19 08:15:57,756 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-19 08:15:57,756 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-19 08:15:57,756 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-19 08:15:57,756 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-11-19 08:15:57,756 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-11-19 08:15:57,809 INFO L235 CfgBuilder]: Building ICFG [2022-11-19 08:15:57,811 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-19 08:15:57,973 INFO L276 CfgBuilder]: Performing block encoding [2022-11-19 08:15:58,054 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-19 08:15:58,058 INFO L300 CfgBuilder]: Removed 2 assume(true) statements. [2022-11-19 08:15:58,060 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 08:15:58 BoogieIcfgContainer [2022-11-19 08:15:58,060 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-19 08:15:58,079 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-19 08:15:58,080 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-19 08:15:58,083 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-19 08:15:58,083 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 08:15:57" (1/3) ... [2022-11-19 08:15:58,084 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7b4104fe and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 08:15:58, skipping insertion in model container [2022-11-19 08:15:58,084 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:15:57" (2/3) ... [2022-11-19 08:15:58,085 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7b4104fe and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 08:15:58, skipping insertion in model container [2022-11-19 08:15:58,085 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 08:15:58" (3/3) ... [2022-11-19 08:15:58,086 INFO L112 eAbstractionObserver]: Analyzing ICFG nested3-1_abstracted.c [2022-11-19 08:15:58,120 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-19 08:15:58,121 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-19 08:15:58,180 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-19 08:15:58,187 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;@385819fb, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-19 08:15:58,187 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-19 08:15:58,192 INFO L276 IsEmpty]: Start isEmpty. Operand has 16 states, 10 states have (on average 1.4) internal successors, (14), 11 states have internal predecessors, (14), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-19 08:15:58,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-11-19 08:15:58,200 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:15:58,200 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-11-19 08:15:58,201 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:15:58,206 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:15:58,206 INFO L85 PathProgramCache]: Analyzing trace with hash -1091749507, now seen corresponding path program 1 times [2022-11-19 08:15:58,217 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:15:58,217 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [752393918] [2022-11-19 08:15:58,218 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:15:58,219 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:15:58,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:15:58,511 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:15:58,511 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:15:58,512 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [752393918] [2022-11-19 08:15:58,513 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [752393918] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 08:15:58,513 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 08:15:58,513 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-19 08:15:58,515 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [171247814] [2022-11-19 08:15:58,516 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 08:15:58,520 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-19 08:15:58,528 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:15:58,576 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-19 08:15:58,577 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-19 08:15:58,580 INFO L87 Difference]: Start difference. First operand has 16 states, 10 states have (on average 1.4) internal successors, (14), 11 states have internal predecessors, (14), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 2 states have internal predecessors, (5), 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) [2022-11-19 08:15:58,668 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:15:58,671 INFO L93 Difference]: Finished difference Result 37 states and 54 transitions. [2022-11-19 08:15:58,672 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-19 08:15:58,674 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 2 states have internal predecessors, (5), 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 6 [2022-11-19 08:15:58,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:15:58,682 INFO L225 Difference]: With dead ends: 37 [2022-11-19 08:15:58,683 INFO L226 Difference]: Without dead ends: 20 [2022-11-19 08:15:58,686 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-19 08:15:58,689 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 4 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 08:15:58,690 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 25 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 08:15:58,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2022-11-19 08:15:58,732 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 15. [2022-11-19 08:15:58,733 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 10 states have (on average 1.3) internal successors, (13), 11 states have internal predecessors, (13), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-19 08:15:58,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 18 transitions. [2022-11-19 08:15:58,737 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 18 transitions. Word has length 6 [2022-11-19 08:15:58,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:15:58,738 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 18 transitions. [2022-11-19 08:15:58,739 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 2 states have internal predecessors, (5), 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) [2022-11-19 08:15:58,739 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 18 transitions. [2022-11-19 08:15:58,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-11-19 08:15:58,742 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:15:58,742 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:15:58,742 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-19 08:15:58,743 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:15:58,746 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:15:58,746 INFO L85 PathProgramCache]: Analyzing trace with hash -1655309817, now seen corresponding path program 1 times [2022-11-19 08:15:58,746 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:15:58,747 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [113774400] [2022-11-19 08:15:58,747 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:15:58,748 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:15:58,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:15:58,911 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:15:58,911 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:15:58,912 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [113774400] [2022-11-19 08:15:58,912 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [113774400] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 08:15:58,912 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 08:15:58,912 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-19 08:15:58,913 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1102564904] [2022-11-19 08:15:58,913 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 08:15:58,918 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-19 08:15:58,918 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:15:58,919 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-19 08:15:58,919 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-19 08:15:58,919 INFO L87 Difference]: Start difference. First operand 15 states and 18 transitions. Second operand has 3 states, 3 states have (on average 2.0) 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) [2022-11-19 08:15:58,957 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:15:58,957 INFO L93 Difference]: Finished difference Result 31 states and 39 transitions. [2022-11-19 08:15:58,958 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-19 08:15:58,959 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.0) 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 [2022-11-19 08:15:58,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:15:58,960 INFO L225 Difference]: With dead ends: 31 [2022-11-19 08:15:58,960 INFO L226 Difference]: Without dead ends: 18 [2022-11-19 08:15:58,962 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-19 08:15:58,966 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 1 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 10 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-19 08:15:58,966 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 23 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 10 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-19 08:15:58,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2022-11-19 08:15:58,971 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 16. [2022-11-19 08:15:58,972 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 12 states have internal predecessors, (14), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-19 08:15:58,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 19 transitions. [2022-11-19 08:15:58,973 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 19 transitions. Word has length 7 [2022-11-19 08:15:58,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:15:58,973 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 19 transitions. [2022-11-19 08:15:58,973 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.0) 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) [2022-11-19 08:15:58,974 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 19 transitions. [2022-11-19 08:15:58,974 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-11-19 08:15:58,974 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:15:58,974 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:15:58,975 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-19 08:15:58,975 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:15:58,975 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:15:58,976 INFO L85 PathProgramCache]: Analyzing trace with hash -1647057710, now seen corresponding path program 1 times [2022-11-19 08:15:58,976 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:15:58,976 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [638449113] [2022-11-19 08:15:58,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:15:58,977 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:15:59,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:15:59,250 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:15:59,250 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:15:59,250 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [638449113] [2022-11-19 08:15:59,251 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [638449113] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 08:15:59,252 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 08:15:59,253 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-19 08:15:59,253 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [179524087] [2022-11-19 08:15:59,253 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 08:15:59,254 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-19 08:15:59,254 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:15:59,255 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-19 08:15:59,255 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-19 08:15:59,256 INFO L87 Difference]: Start difference. First operand 16 states and 19 transitions. Second operand has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 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) [2022-11-19 08:15:59,356 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:15:59,357 INFO L93 Difference]: Finished difference Result 23 states and 25 transitions. [2022-11-19 08:15:59,357 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-19 08:15:59,358 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 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 [2022-11-19 08:15:59,358 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:15:59,359 INFO L225 Difference]: With dead ends: 23 [2022-11-19 08:15:59,359 INFO L226 Difference]: Without dead ends: 21 [2022-11-19 08:15:59,359 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 [2022-11-19 08:15:59,360 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 11 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 08:15:59,361 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 34 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 08:15:59,362 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2022-11-19 08:15:59,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 20. [2022-11-19 08:15:59,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 15 states have internal predecessors, (17), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-19 08:15:59,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2022-11-19 08:15:59,384 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 7 [2022-11-19 08:15:59,384 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:15:59,384 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2022-11-19 08:15:59,385 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 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) [2022-11-19 08:15:59,385 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2022-11-19 08:15:59,385 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-19 08:15:59,386 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:15:59,386 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:15:59,386 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-11-19 08:15:59,386 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:15:59,387 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:15:59,387 INFO L85 PathProgramCache]: Analyzing trace with hash -1577091667, now seen corresponding path program 1 times [2022-11-19 08:15:59,387 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:15:59,388 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1447634413] [2022-11-19 08:15:59,388 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:15:59,388 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:15:59,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:15:59,504 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:15:59,505 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:15:59,505 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1447634413] [2022-11-19 08:15:59,505 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1447634413] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:15:59,505 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1715899122] [2022-11-19 08:15:59,505 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:15:59,506 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:15:59,506 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fc322b3f-bb7a-42fc-83b3-5579d530fa86/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:15:59,511 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fc322b3f-bb7a-42fc-83b3-5579d530fa86/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:15:59,531 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fc322b3f-bb7a-42fc-83b3-5579d530fa86/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-19 08:15:59,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:15:59,580 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 5 conjunts are in the unsatisfiable core [2022-11-19 08:15:59,586 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:15:59,643 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:15:59,643 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:15:59,694 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:15:59,694 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1715899122] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:15:59,694 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2114080555] [2022-11-19 08:15:59,718 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-11-19 08:15:59,718 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:15:59,723 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:15:59,728 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:15:59,730 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:16:00,999 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 41 for LOIs [2022-11-19 08:16:01,070 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:16:01,643 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '326#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 08:16:01,643 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:16:01,644 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:16:01,644 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2022-11-19 08:16:01,644 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1308629995] [2022-11-19 08:16:01,644 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:16:01,645 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-19 08:16:01,645 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:16:01,645 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-19 08:16:01,646 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=138, Unknown=0, NotChecked=0, Total=182 [2022-11-19 08:16:01,646 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 7 states have internal predecessors, (17), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-19 08:16:01,758 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:16:01,758 INFO L93 Difference]: Finished difference Result 47 states and 57 transitions. [2022-11-19 08:16:01,759 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-19 08:16:01,759 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 7 states have internal predecessors, (17), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 14 [2022-11-19 08:16:01,759 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:16:01,760 INFO L225 Difference]: With dead ends: 47 [2022-11-19 08:16:01,761 INFO L226 Difference]: Without dead ends: 29 [2022-11-19 08:16:01,771 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 31 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=52, Invalid=158, Unknown=0, NotChecked=0, Total=210 [2022-11-19 08:16:01,774 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 5 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 08:16:01,775 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 56 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 08:16:01,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2022-11-19 08:16:01,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2022-11-19 08:16:01,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 20 states have (on average 1.15) internal successors, (23), 21 states have internal predecessors, (23), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-11-19 08:16:01,788 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 34 transitions. [2022-11-19 08:16:01,789 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 34 transitions. Word has length 14 [2022-11-19 08:16:01,789 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:16:01,789 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 34 transitions. [2022-11-19 08:16:01,789 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 7 states have internal predecessors, (17), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-19 08:16:01,789 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 34 transitions. [2022-11-19 08:16:01,790 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-11-19 08:16:01,790 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:16:01,791 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1] [2022-11-19 08:16:01,802 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fc322b3f-bb7a-42fc-83b3-5579d530fa86/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-19 08:16:01,995 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fc322b3f-bb7a-42fc-83b3-5579d530fa86/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:16:01,996 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:16:01,996 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:16:01,996 INFO L85 PathProgramCache]: Analyzing trace with hash 1609317511, now seen corresponding path program 2 times [2022-11-19 08:16:01,997 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:16:01,997 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1153889596] [2022-11-19 08:16:01,997 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:16:01,997 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:16:02,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:16:02,164 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 8 proven. 22 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-11-19 08:16:02,164 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:16:02,164 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1153889596] [2022-11-19 08:16:02,164 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1153889596] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:16:02,164 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1981573839] [2022-11-19 08:16:02,164 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 08:16:02,165 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:16:02,165 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fc322b3f-bb7a-42fc-83b3-5579d530fa86/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:16:02,166 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fc322b3f-bb7a-42fc-83b3-5579d530fa86/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:16:02,189 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fc322b3f-bb7a-42fc-83b3-5579d530fa86/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-19 08:16:02,304 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-19 08:16:02,304 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:16:02,305 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-19 08:16:02,307 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:16:02,660 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 18 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-19 08:16:02,661 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-19 08:16:02,661 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1981573839] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 08:16:02,661 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-19 08:16:02,661 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [7] total 12 [2022-11-19 08:16:02,661 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [402484063] [2022-11-19 08:16:02,662 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 08:16:02,662 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-19 08:16:02,662 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:16:02,662 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-19 08:16:02,663 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2022-11-19 08:16:02,663 INFO L87 Difference]: Start difference. First operand 29 states and 34 transitions. Second operand has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 6 states have internal predecessors, (13), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-19 08:16:02,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:16:02,770 INFO L93 Difference]: Finished difference Result 35 states and 39 transitions. [2022-11-19 08:16:02,770 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-19 08:16:02,770 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 6 states have internal predecessors, (13), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 35 [2022-11-19 08:16:02,771 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:16:02,771 INFO L225 Difference]: With dead ends: 35 [2022-11-19 08:16:02,771 INFO L226 Difference]: Without dead ends: 31 [2022-11-19 08:16:02,772 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=41, Invalid=115, Unknown=0, NotChecked=0, Total=156 [2022-11-19 08:16:02,773 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 6 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 66 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 11 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 08:16:02,773 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 66 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 44 Invalid, 0 Unknown, 11 Unchecked, 0.1s Time] [2022-11-19 08:16:02,773 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2022-11-19 08:16:02,782 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2022-11-19 08:16:02,786 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 22 states have (on average 1.0909090909090908) internal successors, (24), 22 states have internal predecessors, (24), 6 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-11-19 08:16:02,791 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2022-11-19 08:16:02,791 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 35 [2022-11-19 08:16:02,792 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:16:02,793 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2022-11-19 08:16:02,793 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 6 states have internal predecessors, (13), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-19 08:16:02,793 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2022-11-19 08:16:02,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-11-19 08:16:02,795 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:16:02,795 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:16:02,808 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fc322b3f-bb7a-42fc-83b3-5579d530fa86/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-11-19 08:16:03,000 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fc322b3f-bb7a-42fc-83b3-5579d530fa86/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:16:03,000 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:16:03,001 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:16:03,001 INFO L85 PathProgramCache]: Analyzing trace with hash 1075068730, now seen corresponding path program 1 times [2022-11-19 08:16:03,001 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:16:03,001 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2141194164] [2022-11-19 08:16:03,001 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:16:03,001 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:16:03,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:16:03,154 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 11 proven. 22 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2022-11-19 08:16:03,154 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:16:03,154 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2141194164] [2022-11-19 08:16:03,155 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2141194164] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:16:03,155 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2132029821] [2022-11-19 08:16:03,155 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:16:03,155 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:16:03,155 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fc322b3f-bb7a-42fc-83b3-5579d530fa86/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:16:03,156 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fc322b3f-bb7a-42fc-83b3-5579d530fa86/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:16:03,179 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fc322b3f-bb7a-42fc-83b3-5579d530fa86/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-19 08:16:03,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:16:03,219 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-19 08:16:03,223 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:16:03,316 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 10 proven. 14 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2022-11-19 08:16:03,316 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:16:03,467 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 22 proven. 2 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2022-11-19 08:16:03,467 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2132029821] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:16:03,467 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [576744409] [2022-11-19 08:16:03,469 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-19 08:16:03,469 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:16:03,470 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:16:03,470 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:16:03,477 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:16:05,540 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-19 08:16:05,546 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:16:06,143 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '924#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 08:16:06,143 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:16:06,144 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:16:06,144 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 6] total 15 [2022-11-19 08:16:06,144 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [902840881] [2022-11-19 08:16:06,144 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:16:06,145 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-11-19 08:16:06,145 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:16:06,145 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-11-19 08:16:06,146 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=462, Unknown=0, NotChecked=0, Total=552 [2022-11-19 08:16:06,146 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand has 15 states, 15 states have (on average 2.6) internal successors, (39), 15 states have internal predecessors, (39), 9 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (11), 9 states have call predecessors, (11), 9 states have call successors, (11) [2022-11-19 08:16:06,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:16:06,900 INFO L93 Difference]: Finished difference Result 128 states and 169 transitions. [2022-11-19 08:16:06,901 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-11-19 08:16:06,901 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.6) internal successors, (39), 15 states have internal predecessors, (39), 9 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (11), 9 states have call predecessors, (11), 9 states have call successors, (11) Word has length 42 [2022-11-19 08:16:06,901 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:16:06,902 INFO L225 Difference]: With dead ends: 128 [2022-11-19 08:16:06,902 INFO L226 Difference]: Without dead ends: 99 [2022-11-19 08:16:06,903 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 110 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 483 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=329, Invalid=1563, Unknown=0, NotChecked=0, Total=1892 [2022-11-19 08:16:06,905 INFO L413 NwaCegarLoop]: 44 mSDtfsCounter, 94 mSDsluCounter, 176 mSDsCounter, 0 mSdLazyCounter, 321 mSolverCounterSat, 97 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 98 SdHoareTripleChecker+Valid, 220 SdHoareTripleChecker+Invalid, 418 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 97 IncrementalHoareTripleChecker+Valid, 321 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-19 08:16:06,906 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [98 Valid, 220 Invalid, 418 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [97 Valid, 321 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-19 08:16:06,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2022-11-19 08:16:06,938 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 91. [2022-11-19 08:16:06,939 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 63 states have (on average 1.0793650793650793) internal successors, (68), 63 states have internal predecessors, (68), 25 states have call successors, (25), 3 states have call predecessors, (25), 2 states have return successors, (24), 24 states have call predecessors, (24), 24 states have call successors, (24) [2022-11-19 08:16:06,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 117 transitions. [2022-11-19 08:16:06,941 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 117 transitions. Word has length 42 [2022-11-19 08:16:06,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:16:06,941 INFO L495 AbstractCegarLoop]: Abstraction has 91 states and 117 transitions. [2022-11-19 08:16:06,942 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.6) internal successors, (39), 15 states have internal predecessors, (39), 9 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (11), 9 states have call predecessors, (11), 9 states have call successors, (11) [2022-11-19 08:16:06,942 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 117 transitions. [2022-11-19 08:16:06,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2022-11-19 08:16:06,947 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:16:06,947 INFO L195 NwaCegarLoop]: trace histogram [25, 24, 24, 20, 20, 20, 20, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1] [2022-11-19 08:16:06,959 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fc322b3f-bb7a-42fc-83b3-5579d530fa86/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2022-11-19 08:16:07,152 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fc322b3f-bb7a-42fc-83b3-5579d530fa86/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-11-19 08:16:07,153 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:16:07,153 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:16:07,153 INFO L85 PathProgramCache]: Analyzing trace with hash -142712643, now seen corresponding path program 2 times [2022-11-19 08:16:07,153 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:16:07,153 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [831332753] [2022-11-19 08:16:07,153 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:16:07,153 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:16:07,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:16:07,762 INFO L134 CoverageAnalysis]: Checked inductivity of 1830 backedges. 310 proven. 35 refuted. 0 times theorem prover too weak. 1485 trivial. 0 not checked. [2022-11-19 08:16:07,763 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:16:07,763 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [831332753] [2022-11-19 08:16:07,763 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [831332753] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:16:07,763 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1778638415] [2022-11-19 08:16:07,763 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 08:16:07,764 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:16:07,764 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fc322b3f-bb7a-42fc-83b3-5579d530fa86/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:16:07,771 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fc322b3f-bb7a-42fc-83b3-5579d530fa86/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:16:07,799 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fc322b3f-bb7a-42fc-83b3-5579d530fa86/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-19 08:16:09,610 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2022-11-19 08:16:09,610 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:16:09,614 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 15 conjunts are in the unsatisfiable core [2022-11-19 08:16:09,619 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:16:09,699 INFO L134 CoverageAnalysis]: Checked inductivity of 1830 backedges. 406 proven. 35 refuted. 0 times theorem prover too weak. 1389 trivial. 0 not checked. [2022-11-19 08:16:09,699 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:16:10,061 INFO L134 CoverageAnalysis]: Checked inductivity of 1830 backedges. 316 proven. 35 refuted. 0 times theorem prover too weak. 1479 trivial. 0 not checked. [2022-11-19 08:16:10,062 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1778638415] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:16:10,062 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [14849209] [2022-11-19 08:16:10,064 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-19 08:16:10,064 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:16:10,064 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:16:10,065 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:16:10,065 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:16:11,871 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-19 08:16:11,875 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:16:12,468 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2403#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 08:16:12,469 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:16:12,469 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:16:12,469 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 9] total 16 [2022-11-19 08:16:12,469 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [773073340] [2022-11-19 08:16:12,469 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:16:12,472 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-11-19 08:16:12,472 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:16:12,473 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-11-19 08:16:12,473 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=477, Unknown=0, NotChecked=0, Total=600 [2022-11-19 08:16:12,474 INFO L87 Difference]: Start difference. First operand 91 states and 117 transitions. Second operand has 16 states, 16 states have (on average 2.875) internal successors, (46), 16 states have internal predecessors, (46), 12 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (15), 12 states have call predecessors, (15), 12 states have call successors, (15) [2022-11-19 08:16:13,668 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:16:13,668 INFO L93 Difference]: Finished difference Result 248 states and 350 transitions. [2022-11-19 08:16:13,669 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-19 08:16:13,669 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.875) internal successors, (46), 16 states have internal predecessors, (46), 12 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (15), 12 states have call predecessors, (15), 12 states have call successors, (15) Word has length 178 [2022-11-19 08:16:13,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:16:13,671 INFO L225 Difference]: With dead ends: 248 [2022-11-19 08:16:13,671 INFO L226 Difference]: Without dead ends: 175 [2022-11-19 08:16:13,672 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 548 GetRequests, 518 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 185 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=215, Invalid=715, Unknown=0, NotChecked=0, Total=930 [2022-11-19 08:16:13,673 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 22 mSDsluCounter, 89 mSDsCounter, 0 mSdLazyCounter, 166 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 117 SdHoareTripleChecker+Invalid, 201 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 166 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-19 08:16:13,673 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [24 Valid, 117 Invalid, 201 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 166 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-19 08:16:13,674 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2022-11-19 08:16:13,733 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 175. [2022-11-19 08:16:13,734 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 175 states, 119 states have (on average 1.0420168067226891) internal successors, (124), 119 states have internal predecessors, (124), 53 states have call successors, (53), 3 states have call predecessors, (53), 2 states have return successors, (52), 52 states have call predecessors, (52), 52 states have call successors, (52) [2022-11-19 08:16:13,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175 states to 175 states and 229 transitions. [2022-11-19 08:16:13,737 INFO L78 Accepts]: Start accepts. Automaton has 175 states and 229 transitions. Word has length 178 [2022-11-19 08:16:13,737 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:16:13,738 INFO L495 AbstractCegarLoop]: Abstraction has 175 states and 229 transitions. [2022-11-19 08:16:13,738 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 2.875) internal successors, (46), 16 states have internal predecessors, (46), 12 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (15), 12 states have call predecessors, (15), 12 states have call successors, (15) [2022-11-19 08:16:13,738 INFO L276 IsEmpty]: Start isEmpty. Operand 175 states and 229 transitions. [2022-11-19 08:16:13,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 375 [2022-11-19 08:16:13,746 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:16:13,746 INFO L195 NwaCegarLoop]: trace histogram [53, 52, 52, 48, 48, 48, 48, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1] [2022-11-19 08:16:13,760 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fc322b3f-bb7a-42fc-83b3-5579d530fa86/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-19 08:16:13,952 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fc322b3f-bb7a-42fc-83b3-5579d530fa86/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:16:13,953 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:16:13,953 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:16:13,953 INFO L85 PathProgramCache]: Analyzing trace with hash 20085617, now seen corresponding path program 3 times [2022-11-19 08:16:13,953 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:16:13,953 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [561833781] [2022-11-19 08:16:13,953 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:16:13,954 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:16:14,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:16:15,582 INFO L134 CoverageAnalysis]: Checked inductivity of 9012 backedges. 1479 proven. 210 refuted. 0 times theorem prover too weak. 7323 trivial. 0 not checked. [2022-11-19 08:16:15,582 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:16:15,582 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [561833781] [2022-11-19 08:16:15,583 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [561833781] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:16:15,583 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [425363259] [2022-11-19 08:16:15,583 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 08:16:15,583 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:16:15,583 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fc322b3f-bb7a-42fc-83b3-5579d530fa86/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:16:15,586 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fc322b3f-bb7a-42fc-83b3-5579d530fa86/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:16:15,607 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fc322b3f-bb7a-42fc-83b3-5579d530fa86/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-19 08:16:15,825 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 08:16:15,825 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:16:15,829 INFO L263 TraceCheckSpWp]: Trace formula consists of 823 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-19 08:16:15,837 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:16:16,289 INFO L134 CoverageAnalysis]: Checked inductivity of 9012 backedges. 104 proven. 2890 refuted. 0 times theorem prover too weak. 6018 trivial. 0 not checked. [2022-11-19 08:16:16,289 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:16:17,123 INFO L134 CoverageAnalysis]: Checked inductivity of 9012 backedges. 208 proven. 2786 refuted. 0 times theorem prover too weak. 6018 trivial. 0 not checked. [2022-11-19 08:16:17,123 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [425363259] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:16:17,123 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [580377367] [2022-11-19 08:16:17,125 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-19 08:16:17,126 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:16:17,126 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:16:17,126 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:16:17,126 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:16:18,612 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-19 08:16:18,615 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:16:23,666 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5392#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 08:16:23,666 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:16:23,666 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:16:23,666 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 12, 12] total 35 [2022-11-19 08:16:23,667 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1121375118] [2022-11-19 08:16:23,667 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:16:23,668 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-11-19 08:16:23,668 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:16:23,669 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-11-19 08:16:23,670 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=230, Invalid=1576, Unknown=0, NotChecked=0, Total=1806 [2022-11-19 08:16:23,670 INFO L87 Difference]: Start difference. First operand 175 states and 229 transitions. Second operand has 35 states, 35 states have (on average 2.8857142857142857) internal successors, (101), 35 states have internal predecessors, (101), 29 states have call successors, (39), 2 states have call predecessors, (39), 1 states have return successors, (38), 29 states have call predecessors, (38), 29 states have call successors, (38) [2022-11-19 08:16:37,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:16:37,373 INFO L93 Difference]: Finished difference Result 601 states and 816 transitions. [2022-11-19 08:16:37,373 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 146 states. [2022-11-19 08:16:37,374 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.8857142857142857) internal successors, (101), 35 states have internal predecessors, (101), 29 states have call successors, (39), 2 states have call predecessors, (39), 1 states have return successors, (38), 29 states have call predecessors, (38), 29 states have call successors, (38) Word has length 374 [2022-11-19 08:16:37,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:16:37,377 INFO L225 Difference]: With dead ends: 601 [2022-11-19 08:16:37,377 INFO L226 Difference]: Without dead ends: 465 [2022-11-19 08:16:37,394 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1269 GetRequests, 995 SyntacticMatches, 100 SemanticMatches, 174 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13203 ImplicationChecksByTransitivity, 15.1s TimeCoverageRelationStatistics Valid=3448, Invalid=27352, Unknown=0, NotChecked=0, Total=30800 [2022-11-19 08:16:37,395 INFO L413 NwaCegarLoop]: 221 mSDtfsCounter, 551 mSDsluCounter, 1167 mSDsCounter, 0 mSdLazyCounter, 5134 mSolverCounterSat, 609 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 555 SdHoareTripleChecker+Valid, 1388 SdHoareTripleChecker+Invalid, 5743 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 609 IncrementalHoareTripleChecker+Valid, 5134 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.9s IncrementalHoareTripleChecker+Time [2022-11-19 08:16:37,395 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [555 Valid, 1388 Invalid, 5743 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [609 Valid, 5134 Invalid, 0 Unknown, 0 Unchecked, 3.9s Time] [2022-11-19 08:16:37,397 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 465 states. [2022-11-19 08:16:37,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 465 to 445. [2022-11-19 08:16:37,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 445 states, 301 states have (on average 1.0365448504983388) internal successors, (312), 301 states have internal predecessors, (312), 141 states have call successors, (141), 3 states have call predecessors, (141), 2 states have return successors, (140), 140 states have call predecessors, (140), 140 states have call successors, (140) [2022-11-19 08:16:37,559 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 445 states to 445 states and 593 transitions. [2022-11-19 08:16:37,559 INFO L78 Accepts]: Start accepts. Automaton has 445 states and 593 transitions. Word has length 374 [2022-11-19 08:16:37,560 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:16:37,560 INFO L495 AbstractCegarLoop]: Abstraction has 445 states and 593 transitions. [2022-11-19 08:16:37,560 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 2.8857142857142857) internal successors, (101), 35 states have internal predecessors, (101), 29 states have call successors, (39), 2 states have call predecessors, (39), 1 states have return successors, (38), 29 states have call predecessors, (38), 29 states have call successors, (38) [2022-11-19 08:16:37,560 INFO L276 IsEmpty]: Start isEmpty. Operand 445 states and 593 transitions. [2022-11-19 08:16:37,600 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 997 [2022-11-19 08:16:37,600 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:16:37,601 INFO L195 NwaCegarLoop]: trace histogram [141, 140, 140, 130, 130, 130, 130, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1] [2022-11-19 08:16:37,611 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fc322b3f-bb7a-42fc-83b3-5579d530fa86/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-19 08:16:37,807 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fc322b3f-bb7a-42fc-83b3-5579d530fa86/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:16:37,808 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:16:37,808 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:16:37,808 INFO L85 PathProgramCache]: Analyzing trace with hash -1374958435, now seen corresponding path program 4 times [2022-11-19 08:16:37,808 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:16:37,809 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [324626567] [2022-11-19 08:16:37,809 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:16:37,809 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:16:38,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:16:42,064 INFO L134 CoverageAnalysis]: Checked inductivity of 65845 backedges. 5096 proven. 247 refuted. 0 times theorem prover too weak. 60502 trivial. 0 not checked. [2022-11-19 08:16:42,064 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:16:42,064 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [324626567] [2022-11-19 08:16:42,065 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [324626567] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:16:42,068 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [656440916] [2022-11-19 08:16:42,069 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 08:16:42,069 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:16:42,069 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fc322b3f-bb7a-42fc-83b3-5579d530fa86/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:16:42,070 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fc322b3f-bb7a-42fc-83b3-5579d530fa86/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:16:42,091 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fc322b3f-bb7a-42fc-83b3-5579d530fa86/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-19 08:16:42,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:16:42,587 INFO L263 TraceCheckSpWp]: Trace formula consists of 2143 conjuncts, 46 conjunts are in the unsatisfiable core [2022-11-19 08:16:42,605 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:16:43,814 INFO L134 CoverageAnalysis]: Checked inductivity of 65845 backedges. 280 proven. 24413 refuted. 0 times theorem prover too weak. 41152 trivial. 0 not checked. [2022-11-19 08:16:43,815 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:16:46,177 INFO L134 CoverageAnalysis]: Checked inductivity of 65845 backedges. 373 proven. 24320 refuted. 0 times theorem prover too weak. 41152 trivial. 0 not checked. [2022-11-19 08:16:46,178 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [656440916] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:16:46,178 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1235636096] [2022-11-19 08:16:46,180 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-19 08:16:46,181 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:16:46,181 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:16:46,181 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:16:46,181 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:16:47,675 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-19 08:16:47,678 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:17:07,290 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13429#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 08:17:07,290 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:17:07,290 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:17:07,291 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 24, 24] total 60 [2022-11-19 08:17:07,291 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [642439548] [2022-11-19 08:17:07,291 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:17:07,293 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2022-11-19 08:17:07,293 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:17:07,294 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2022-11-19 08:17:07,295 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=689, Invalid=3867, Unknown=0, NotChecked=0, Total=4556 [2022-11-19 08:17:07,295 INFO L87 Difference]: Start difference. First operand 445 states and 593 transitions. Second operand has 60 states, 60 states have (on average 3.1166666666666667) internal successors, (187), 60 states have internal predecessors, (187), 54 states have call successors, (76), 2 states have call predecessors, (76), 1 states have return successors, (75), 54 states have call predecessors, (75), 54 states have call successors, (75) [2022-11-19 08:20:31,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:20:31,333 INFO L93 Difference]: Finished difference Result 1474 states and 2014 transitions. [2022-11-19 08:20:31,333 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 342 states. [2022-11-19 08:20:31,334 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 60 states have (on average 3.1166666666666667) internal successors, (187), 60 states have internal predecessors, (187), 54 states have call successors, (76), 2 states have call predecessors, (76), 1 states have return successors, (75), 54 states have call predecessors, (75), 54 states have call successors, (75) Word has length 996 [2022-11-19 08:20:31,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:20:31,340 INFO L225 Difference]: With dead ends: 1474 [2022-11-19 08:20:31,341 INFO L226 Difference]: Without dead ends: 1071 [2022-11-19 08:20:31,363 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3320 GetRequests, 2667 SyntacticMatches, 270 SemanticMatches, 383 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70847 ImplicationChecksByTransitivity, 211.0s TimeCoverageRelationStatistics Valid=15795, Invalid=132044, Unknown=1, NotChecked=0, Total=147840 [2022-11-19 08:20:31,364 INFO L413 NwaCegarLoop]: 512 mSDtfsCounter, 1400 mSDsluCounter, 5780 mSDsCounter, 0 mSdLazyCounter, 18764 mSolverCounterSat, 1523 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 11.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1404 SdHoareTripleChecker+Valid, 6292 SdHoareTripleChecker+Invalid, 20287 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 1523 IncrementalHoareTripleChecker+Valid, 18764 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 13.5s IncrementalHoareTripleChecker+Time [2022-11-19 08:20:31,364 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1404 Valid, 6292 Invalid, 20287 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [1523 Valid, 18764 Invalid, 0 Unknown, 0 Unchecked, 13.5s Time] [2022-11-19 08:20:31,365 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1071 states. [2022-11-19 08:20:31,602 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1071 to 1027. [2022-11-19 08:20:31,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1027 states, 693 states have (on average 1.0331890331890332) internal successors, (716), 693 states have internal predecessors, (716), 331 states have call successors, (331), 3 states have call predecessors, (331), 2 states have return successors, (330), 330 states have call predecessors, (330), 330 states have call successors, (330) [2022-11-19 08:20:31,611 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1027 states to 1027 states and 1377 transitions. [2022-11-19 08:20:31,611 INFO L78 Accepts]: Start accepts. Automaton has 1027 states and 1377 transitions. Word has length 996 [2022-11-19 08:20:31,612 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:20:31,612 INFO L495 AbstractCegarLoop]: Abstraction has 1027 states and 1377 transitions. [2022-11-19 08:20:31,613 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 60 states have (on average 3.1166666666666667) internal successors, (187), 60 states have internal predecessors, (187), 54 states have call successors, (76), 2 states have call predecessors, (76), 1 states have return successors, (75), 54 states have call predecessors, (75), 54 states have call successors, (75) [2022-11-19 08:20:31,613 INFO L276 IsEmpty]: Start isEmpty. Operand 1027 states and 1377 transitions. [2022-11-19 08:20:31,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2339 [2022-11-19 08:20:31,686 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:20:31,686 INFO L195 NwaCegarLoop]: trace histogram [331, 330, 330, 308, 308, 308, 308, 22, 22, 22, 22, 22, 1, 1, 1, 1, 1] [2022-11-19 08:20:31,695 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fc322b3f-bb7a-42fc-83b3-5579d530fa86/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-19 08:20:31,890 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fc322b3f-bb7a-42fc-83b3-5579d530fa86/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2022-11-19 08:20:31,891 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:20:31,891 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:20:31,892 INFO L85 PathProgramCache]: Analyzing trace with hash 797960315, now seen corresponding path program 5 times [2022-11-19 08:20:31,892 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:20:31,892 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [602130150] [2022-11-19 08:20:31,892 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:20:31,892 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:20:34,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:20:42,251 INFO L134 CoverageAnalysis]: Checked inductivity of 367356 backedges. 13639 proven. 287 refuted. 0 times theorem prover too weak. 353430 trivial. 0 not checked. [2022-11-19 08:20:42,251 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:20:42,251 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [602130150] [2022-11-19 08:20:42,251 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [602130150] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:20:42,252 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2020563499] [2022-11-19 08:20:42,252 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 08:20:42,252 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:20:42,252 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fc322b3f-bb7a-42fc-83b3-5579d530fa86/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:20:42,255 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fc322b3f-bb7a-42fc-83b3-5579d530fa86/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:20:42,258 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fc322b3f-bb7a-42fc-83b3-5579d530fa86/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-19 08:21:03,407 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 19 check-sat command(s) [2022-11-19 08:21:03,407 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:21:03,428 INFO L263 TraceCheckSpWp]: Trace formula consists of 316 conjuncts, 37 conjunts are in the unsatisfiable core [2022-11-19 08:21:03,458 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:21:03,689 INFO L134 CoverageAnalysis]: Checked inductivity of 367356 backedges. 14995 proven. 287 refuted. 0 times theorem prover too weak. 352074 trivial. 0 not checked. [2022-11-19 08:21:03,690 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:21:06,752 INFO L134 CoverageAnalysis]: Checked inductivity of 367356 backedges. 14668 proven. 287 refuted. 0 times theorem prover too weak. 352401 trivial. 0 not checked. [2022-11-19 08:21:06,752 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2020563499] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:21:06,752 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [143625503] [2022-11-19 08:21:06,758 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-19 08:21:06,758 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:21:06,758 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:21:06,759 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:21:06,759 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:21:08,313 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-19 08:21:08,317 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:21:09,287 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '32294#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 08:21:09,288 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:21:09,288 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:21:09,290 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 21] total 37 [2022-11-19 08:21:09,290 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [417048556] [2022-11-19 08:21:09,290 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:21:09,293 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-11-19 08:21:09,294 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:21:09,294 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-11-19 08:21:09,295 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=413, Invalid=1657, Unknown=0, NotChecked=0, Total=2070 [2022-11-19 08:21:09,295 INFO L87 Difference]: Start difference. First operand 1027 states and 1377 transitions. Second operand has 37 states, 36 states have (on average 2.361111111111111) internal successors, (85), 37 states have internal predecessors, (85), 31 states have call successors, (35), 2 states have call predecessors, (35), 3 states have return successors, (34), 30 states have call predecessors, (34), 31 states have call successors, (34) [2022-11-19 08:21:29,108 WARN L233 SmtUtils]: Spent 17.95s on a formula simplification. DAG size of input: 97 DAG size of output: 10 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-19 08:21:39,736 WARN L233 SmtUtils]: Spent 8.37s on a formula simplification. DAG size of input: 91 DAG size of output: 10 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-19 08:21:51,866 WARN L233 SmtUtils]: Spent 9.14s on a formula simplification. DAG size of input: 85 DAG size of output: 10 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-19 08:22:04,659 WARN L233 SmtUtils]: Spent 9.84s on a formula simplification. DAG size of input: 79 DAG size of output: 10 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-19 08:22:34,536 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.69s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-11-19 08:23:12,220 WARN L233 SmtUtils]: Spent 36.80s on a formula simplification that was a NOOP. DAG size: 76 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-19 08:23:45,076 WARN L233 SmtUtils]: Spent 26.43s on a formula simplification that was a NOOP. DAG size: 90 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-19 08:24:13,399 WARN L233 SmtUtils]: Spent 21.28s 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) [2022-11-19 08:24:14,425 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:24:14,425 INFO L93 Difference]: Finished difference Result 3087 states and 4498 transitions. [2022-11-19 08:24:14,426 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-11-19 08:24:14,426 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 36 states have (on average 2.361111111111111) internal successors, (85), 37 states have internal predecessors, (85), 31 states have call successors, (35), 2 states have call predecessors, (35), 3 states have return successors, (34), 30 states have call predecessors, (34), 31 states have call successors, (34) Word has length 2338 [2022-11-19 08:24:14,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:24:14,440 INFO L225 Difference]: With dead ends: 3087 [2022-11-19 08:24:14,440 INFO L226 Difference]: Without dead ends: 2083 [2022-11-19 08:24:14,445 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7048 GetRequests, 6986 SyntacticMatches, 1 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 600 ImplicationChecksByTransitivity, 179.9s TimeCoverageRelationStatistics Valid=982, Invalid=2921, Unknown=3, NotChecked=0, Total=3906 [2022-11-19 08:24:14,446 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 118 mSDsluCounter, 291 mSDsCounter, 0 mSdLazyCounter, 995 mSolverCounterSat, 239 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 120 SdHoareTripleChecker+Valid, 314 SdHoareTripleChecker+Invalid, 1234 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 239 IncrementalHoareTripleChecker+Valid, 995 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.3s IncrementalHoareTripleChecker+Time [2022-11-19 08:24:14,447 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [120 Valid, 314 Invalid, 1234 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [239 Valid, 995 Invalid, 0 Unknown, 0 Unchecked, 7.3s Time] [2022-11-19 08:24:14,450 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2083 states. [2022-11-19 08:24:14,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2083 to 2083. [2022-11-19 08:24:14,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2083 states, 1397 states have (on average 1.0164638511095203) internal successors, (1420), 1397 states have internal predecessors, (1420), 683 states have call successors, (683), 3 states have call predecessors, (683), 2 states have return successors, (682), 682 states have call predecessors, (682), 682 states have call successors, (682) [2022-11-19 08:24:14,973 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2083 states to 2083 states and 2785 transitions. [2022-11-19 08:24:14,973 INFO L78 Accepts]: Start accepts. Automaton has 2083 states and 2785 transitions. Word has length 2338 [2022-11-19 08:24:14,974 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:24:14,975 INFO L495 AbstractCegarLoop]: Abstraction has 2083 states and 2785 transitions. [2022-11-19 08:24:14,975 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 36 states have (on average 2.361111111111111) internal successors, (85), 37 states have internal predecessors, (85), 31 states have call successors, (35), 2 states have call predecessors, (35), 3 states have return successors, (34), 30 states have call predecessors, (34), 31 states have call successors, (34) [2022-11-19 08:24:14,975 INFO L276 IsEmpty]: Start isEmpty. Operand 2083 states and 2785 transitions. [2022-11-19 08:24:15,170 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4803 [2022-11-19 08:24:15,170 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:24:15,172 INFO L195 NwaCegarLoop]: trace histogram [683, 682, 682, 660, 660, 660, 660, 22, 22, 22, 22, 22, 1, 1, 1, 1, 1] [2022-11-19 08:24:15,184 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fc322b3f-bb7a-42fc-83b3-5579d530fa86/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-19 08:24:15,384 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fc322b3f-bb7a-42fc-83b3-5579d530fa86/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-19 08:24:15,384 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:24:15,384 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:24:15,385 INFO L85 PathProgramCache]: Analyzing trace with hash -1629040005, now seen corresponding path program 6 times [2022-11-19 08:24:15,385 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:24:15,385 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [680633791] [2022-11-19 08:24:15,385 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:24:15,385 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:24:25,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:24:59,694 INFO L134 CoverageAnalysis]: Checked inductivity of 1598124 backedges. 59367 proven. 1335 refuted. 0 times theorem prover too weak. 1537422 trivial. 0 not checked. [2022-11-19 08:24:59,694 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:24:59,694 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [680633791] [2022-11-19 08:24:59,694 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [680633791] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:24:59,695 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [951642102] [2022-11-19 08:24:59,695 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 08:24:59,695 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:24:59,695 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fc322b3f-bb7a-42fc-83b3-5579d530fa86/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:24:59,699 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fc322b3f-bb7a-42fc-83b3-5579d530fa86/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:24:59,701 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fc322b3f-bb7a-42fc-83b3-5579d530fa86/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-19 08:25:01,909 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 08:25:01,909 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:25:01,965 INFO L263 TraceCheckSpWp]: Trace formula consists of 10273 conjuncts, 94 conjunts are in the unsatisfiable core [2022-11-19 08:25:02,034 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:25:07,689 INFO L134 CoverageAnalysis]: Checked inductivity of 1598124 backedges. 1364 proven. 639757 refuted. 0 times theorem prover too weak. 957003 trivial. 0 not checked. [2022-11-19 08:25:07,690 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:25:19,196 INFO L134 CoverageAnalysis]: Checked inductivity of 1598124 backedges. 1900 proven. 639221 refuted. 0 times theorem prover too weak. 957003 trivial. 0 not checked. [2022-11-19 08:25:19,197 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [951642102] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:25:19,197 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [551978154] [2022-11-19 08:25:19,200 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-19 08:25:19,200 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:25:19,201 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:25:19,201 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:25:19,201 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:25:20,695 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-19 08:25:20,698 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:25:22,643 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '69900#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 08:25:22,644 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:25:22,644 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:25:22,647 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 48, 48] total 125 [2022-11-19 08:25:22,647 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [852131638] [2022-11-19 08:25:22,647 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:25:22,655 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 125 states [2022-11-19 08:25:22,655 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:25:22,657 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 125 interpolants. [2022-11-19 08:25:22,658 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2520, Invalid=15302, Unknown=0, NotChecked=0, Total=17822 [2022-11-19 08:25:22,659 INFO L87 Difference]: Start difference. First operand 2083 states and 2785 transitions. Second operand has 125 states, 125 states have (on average 3.112) internal successors, (389), 125 states have internal predecessors, (389), 119 states have call successors, (165), 2 states have call predecessors, (165), 1 states have return successors, (164), 119 states have call predecessors, (164), 119 states have call successors, (164) [2022-11-19 08:29:25,692 WARN L233 SmtUtils]: Spent 6.45s on a formula simplification. DAG size of input: 97 DAG size of output: 14 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate)