./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loops-crafted-1/mono-crafted_14.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 6b4ec56b Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2bdf7817-b52a-4836-b6ac-0e3a796ae0c8/bin/utaipan-6cKwYrpEi9/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2bdf7817-b52a-4836-b6ac-0e3a796ae0c8/bin/utaipan-6cKwYrpEi9/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2bdf7817-b52a-4836-b6ac-0e3a796ae0c8/bin/utaipan-6cKwYrpEi9/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2bdf7817-b52a-4836-b6ac-0e3a796ae0c8/bin/utaipan-6cKwYrpEi9/config/TaipanReach.xml -i ../../sv-benchmarks/c/loops-crafted-1/mono-crafted_14.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2bdf7817-b52a-4836-b6ac-0e3a796ae0c8/bin/utaipan-6cKwYrpEi9/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2bdf7817-b52a-4836-b6ac-0e3a796ae0c8/bin/utaipan-6cKwYrpEi9 --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 538775af36be57be36a6cd470d0ff7a3d7714753249a7d4cb9a7b907cdacda78 --- 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-6b4ec56 [2022-11-20 20:38:35,422 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-20 20:38:35,425 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-20 20:38:35,455 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-20 20:38:35,456 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-20 20:38:35,457 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-20 20:38:35,459 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-20 20:38:35,461 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-20 20:38:35,463 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-20 20:38:35,464 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-20 20:38:35,465 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-20 20:38:35,467 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-20 20:38:35,467 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-20 20:38:35,469 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-20 20:38:35,480 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-20 20:38:35,482 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-20 20:38:35,485 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-20 20:38:35,490 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-20 20:38:35,492 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-20 20:38:35,497 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-20 20:38:35,504 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-20 20:38:35,519 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-20 20:38:35,521 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-20 20:38:35,522 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-20 20:38:35,526 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-20 20:38:35,526 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-20 20:38:35,526 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-20 20:38:35,527 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-20 20:38:35,528 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-20 20:38:35,529 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-20 20:38:35,529 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-20 20:38:35,530 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-20 20:38:35,531 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-20 20:38:35,532 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-20 20:38:35,533 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-20 20:38:35,533 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-20 20:38:35,534 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-20 20:38:35,534 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-20 20:38:35,534 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-20 20:38:35,540 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-20 20:38:35,556 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-20 20:38:35,557 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2bdf7817-b52a-4836-b6ac-0e3a796ae0c8/bin/utaipan-6cKwYrpEi9/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-20 20:38:35,598 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-20 20:38:35,599 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-20 20:38:35,604 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-20 20:38:35,605 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-20 20:38:35,606 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-20 20:38:35,606 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-20 20:38:35,606 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-20 20:38:35,606 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-20 20:38:35,607 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-20 20:38:35,607 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-20 20:38:35,608 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-20 20:38:35,608 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-20 20:38:35,608 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-20 20:38:35,609 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-20 20:38:35,609 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-20 20:38:35,609 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-20 20:38:35,609 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-20 20:38:35,609 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-20 20:38:35,611 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-20 20:38:35,611 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-20 20:38:35,611 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-20 20:38:35,611 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-20 20:38:35,612 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-20 20:38:35,612 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-20 20:38:35,612 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-20 20:38:35,613 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-20 20:38:35,613 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-20 20:38:35,613 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-20 20:38:35,614 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-20 20:38:35,614 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-20 20:38:35,614 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-20 20:38:35,614 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-20 20:38:35,615 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-20 20:38:35,615 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-20 20:38:35,615 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-20 20:38:35,615 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-20 20:38:35,615 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-20 20:38:35,616 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-20 20:38:35,616 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-20 20:38:35,616 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-20 20:38:35,616 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-20 20:38:35,617 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_2bdf7817-b52a-4836-b6ac-0e3a796ae0c8/bin/utaipan-6cKwYrpEi9/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2bdf7817-b52a-4836-b6ac-0e3a796ae0c8/bin/utaipan-6cKwYrpEi9 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 538775af36be57be36a6cd470d0ff7a3d7714753249a7d4cb9a7b907cdacda78 [2022-11-20 20:38:35,941 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-20 20:38:35,990 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-20 20:38:35,993 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-20 20:38:35,994 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-20 20:38:35,995 INFO L275 PluginConnector]: CDTParser initialized [2022-11-20 20:38:35,996 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2bdf7817-b52a-4836-b6ac-0e3a796ae0c8/bin/utaipan-6cKwYrpEi9/../../sv-benchmarks/c/loops-crafted-1/mono-crafted_14.c [2022-11-20 20:38:39,171 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-20 20:38:39,474 INFO L351 CDTParser]: Found 1 translation units. [2022-11-20 20:38:39,474 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2bdf7817-b52a-4836-b6ac-0e3a796ae0c8/sv-benchmarks/c/loops-crafted-1/mono-crafted_14.c [2022-11-20 20:38:39,480 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2bdf7817-b52a-4836-b6ac-0e3a796ae0c8/bin/utaipan-6cKwYrpEi9/data/cfb8f7a6a/2a8c6eeaa7d745b08ab8183ded3f30f4/FLAG924a648e5 [2022-11-20 20:38:39,499 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2bdf7817-b52a-4836-b6ac-0e3a796ae0c8/bin/utaipan-6cKwYrpEi9/data/cfb8f7a6a/2a8c6eeaa7d745b08ab8183ded3f30f4 [2022-11-20 20:38:39,503 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-20 20:38:39,506 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-20 20:38:39,509 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-20 20:38:39,509 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-20 20:38:39,513 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-20 20:38:39,513 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 08:38:39" (1/1) ... [2022-11-20 20:38:39,515 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@50e4bdb3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:38:39, skipping insertion in model container [2022-11-20 20:38:39,516 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 08:38:39" (1/1) ... [2022-11-20 20:38:39,524 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-20 20:38:39,549 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-20 20:38:39,711 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2bdf7817-b52a-4836-b6ac-0e3a796ae0c8/sv-benchmarks/c/loops-crafted-1/mono-crafted_14.c[319,332] [2022-11-20 20:38:39,724 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-20 20:38:39,732 INFO L203 MainTranslator]: Completed pre-run [2022-11-20 20:38:39,744 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2bdf7817-b52a-4836-b6ac-0e3a796ae0c8/sv-benchmarks/c/loops-crafted-1/mono-crafted_14.c[319,332] [2022-11-20 20:38:39,748 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-20 20:38:39,766 INFO L208 MainTranslator]: Completed translation [2022-11-20 20:38:39,766 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:38:39 WrapperNode [2022-11-20 20:38:39,767 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-20 20:38:39,768 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-20 20:38:39,768 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-20 20:38:39,769 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-20 20:38:39,778 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:38:39" (1/1) ... [2022-11-20 20:38:39,786 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:38:39" (1/1) ... [2022-11-20 20:38:39,810 INFO L138 Inliner]: procedures = 12, calls = 9, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 43 [2022-11-20 20:38:39,810 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-20 20:38:39,811 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-20 20:38:39,811 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-20 20:38:39,812 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-20 20:38:39,823 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:38:39" (1/1) ... [2022-11-20 20:38:39,823 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:38:39" (1/1) ... [2022-11-20 20:38:39,839 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:38:39" (1/1) ... [2022-11-20 20:38:39,840 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:38:39" (1/1) ... [2022-11-20 20:38:39,843 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:38:39" (1/1) ... [2022-11-20 20:38:39,851 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:38:39" (1/1) ... [2022-11-20 20:38:39,855 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:38:39" (1/1) ... [2022-11-20 20:38:39,862 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:38:39" (1/1) ... [2022-11-20 20:38:39,864 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-20 20:38:39,865 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-20 20:38:39,865 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-20 20:38:39,865 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-20 20:38:39,867 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:38:39" (1/1) ... [2022-11-20 20:38:39,875 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-20 20:38:39,889 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2bdf7817-b52a-4836-b6ac-0e3a796ae0c8/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:38:39,913 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2bdf7817-b52a-4836-b6ac-0e3a796ae0c8/bin/utaipan-6cKwYrpEi9/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-20 20:38:39,934 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2bdf7817-b52a-4836-b6ac-0e3a796ae0c8/bin/utaipan-6cKwYrpEi9/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-20 20:38:39,968 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-20 20:38:39,968 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-20 20:38:39,968 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-20 20:38:39,968 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-20 20:38:39,969 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-11-20 20:38:39,969 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-11-20 20:38:40,036 INFO L235 CfgBuilder]: Building ICFG [2022-11-20 20:38:40,038 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-20 20:38:40,224 INFO L276 CfgBuilder]: Performing block encoding [2022-11-20 20:38:40,285 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-20 20:38:40,285 INFO L300 CfgBuilder]: Removed 2 assume(true) statements. [2022-11-20 20:38:40,288 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 08:38:40 BoogieIcfgContainer [2022-11-20 20:38:40,288 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-20 20:38:40,297 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-20 20:38:40,298 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-20 20:38:40,301 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-20 20:38:40,302 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.11 08:38:39" (1/3) ... [2022-11-20 20:38:40,303 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6b61ec01 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 08:38:40, skipping insertion in model container [2022-11-20 20:38:40,303 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:38:39" (2/3) ... [2022-11-20 20:38:40,305 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6b61ec01 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 08:38:40, skipping insertion in model container [2022-11-20 20:38:40,306 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 08:38:40" (3/3) ... [2022-11-20 20:38:40,311 INFO L112 eAbstractionObserver]: Analyzing ICFG mono-crafted_14.c [2022-11-20 20:38:40,333 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-20 20:38:40,333 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-20 20:38:40,410 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-20 20:38:40,419 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;@7d0144fc, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-20 20:38:40,419 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-20 20:38:40,425 INFO L276 IsEmpty]: Start isEmpty. Operand has 13 states, 8 states have (on average 1.5) internal successors, (12), 9 states have internal predecessors, (12), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-20 20:38:40,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-11-20 20:38:40,436 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:38:40,437 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:38:40,438 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:38:40,447 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:38:40,447 INFO L85 PathProgramCache]: Analyzing trace with hash -1099884338, now seen corresponding path program 1 times [2022-11-20 20:38:40,460 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:38:40,460 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1761241717] [2022-11-20 20:38:40,461 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:38:40,462 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:38:40,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:38:40,761 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:38:40,762 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:38:40,762 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1761241717] [2022-11-20 20:38:40,763 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1761241717] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:38:40,764 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:38:40,764 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-20 20:38:40,766 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [19913743] [2022-11-20 20:38:40,767 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:38:40,773 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 20:38:40,773 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:38:40,843 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 20:38:40,844 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 20:38:40,846 INFO L87 Difference]: Start difference. First operand has 13 states, 8 states have (on average 1.5) internal successors, (12), 9 states have internal predecessors, (12), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:38:40,931 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:38:40,934 INFO L93 Difference]: Finished difference Result 25 states and 33 transitions. [2022-11-20 20:38:40,936 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 20:38:40,937 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2022-11-20 20:38:40,938 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:38:40,946 INFO L225 Difference]: With dead ends: 25 [2022-11-20 20:38:40,947 INFO L226 Difference]: Without dead ends: 12 [2022-11-20 20:38:40,951 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 20:38:40,961 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 0 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-20 20:38:40,964 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 18 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-20 20:38:40,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2022-11-20 20:38:41,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2022-11-20 20:38:41,010 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 8 states have (on average 1.375) internal successors, (11), 9 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-20 20:38:41,012 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 14 transitions. [2022-11-20 20:38:41,015 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 14 transitions. Word has length 7 [2022-11-20 20:38:41,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:38:41,017 INFO L495 AbstractCegarLoop]: Abstraction has 12 states and 14 transitions. [2022-11-20 20:38:41,017 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:38:41,018 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 14 transitions. [2022-11-20 20:38:41,019 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-11-20 20:38:41,019 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:38:41,020 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:38:41,020 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-20 20:38:41,021 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:38:41,022 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:38:41,023 INFO L85 PathProgramCache]: Analyzing trace with hash 1962003808, now seen corresponding path program 1 times [2022-11-20 20:38:41,023 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:38:41,023 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [707266613] [2022-11-20 20:38:41,024 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:38:41,025 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:38:41,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:38:41,223 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:38:41,224 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:38:41,224 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [707266613] [2022-11-20 20:38:41,226 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [707266613] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 20:38:41,226 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [338936585] [2022-11-20 20:38:41,226 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:38:41,227 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:38:41,227 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2bdf7817-b52a-4836-b6ac-0e3a796ae0c8/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:38:41,230 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2bdf7817-b52a-4836-b6ac-0e3a796ae0c8/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:38:41,255 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2bdf7817-b52a-4836-b6ac-0e3a796ae0c8/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-20 20:38:41,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:38:41,293 INFO L263 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-20 20:38:41,299 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:38:41,381 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:38:41,381 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:38:41,526 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:38:41,526 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [338936585] provided 1 perfect and 1 imperfect interpolant sequences [2022-11-20 20:38:41,526 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-20 20:38:41,527 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3, 3] total 7 [2022-11-20 20:38:41,528 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [975097029] [2022-11-20 20:38:41,529 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:38:41,529 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-20 20:38:41,530 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:38:41,530 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-20 20:38:41,531 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2022-11-20 20:38:41,531 INFO L87 Difference]: Start difference. First operand 12 states and 14 transitions. Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:38:41,553 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:38:41,553 INFO L93 Difference]: Finished difference Result 21 states and 24 transitions. [2022-11-20 20:38:41,554 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 20:38:41,554 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2022-11-20 20:38:41,554 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:38:41,555 INFO L225 Difference]: With dead ends: 21 [2022-11-20 20:38:41,555 INFO L226 Difference]: Without dead ends: 13 [2022-11-20 20:38:41,556 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2022-11-20 20:38:41,557 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 1 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 12 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 10 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-20 20:38:41,557 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 23 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 10 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-20 20:38:41,558 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2022-11-20 20:38:41,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2022-11-20 20:38:41,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 10 states have internal predecessors, (12), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-20 20:38:41,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 15 transitions. [2022-11-20 20:38:41,562 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 15 transitions. Word has length 8 [2022-11-20 20:38:41,562 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:38:41,562 INFO L495 AbstractCegarLoop]: Abstraction has 13 states and 15 transitions. [2022-11-20 20:38:41,563 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:38:41,563 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 15 transitions. [2022-11-20 20:38:41,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-20 20:38:41,563 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:38:41,564 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:38:41,577 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2bdf7817-b52a-4836-b6ac-0e3a796ae0c8/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-20 20:38:41,770 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2bdf7817-b52a-4836-b6ac-0e3a796ae0c8/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2022-11-20 20:38:41,770 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:38:41,771 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:38:41,771 INFO L85 PathProgramCache]: Analyzing trace with hash -185367768, now seen corresponding path program 1 times [2022-11-20 20:38:41,771 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:38:41,771 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [204990179] [2022-11-20 20:38:41,771 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:38:41,772 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:38:41,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:38:41,876 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:38:41,877 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:38:41,877 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [204990179] [2022-11-20 20:38:41,878 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [204990179] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 20:38:41,882 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2038149280] [2022-11-20 20:38:41,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:38:41,882 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:38:41,883 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2bdf7817-b52a-4836-b6ac-0e3a796ae0c8/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:38:41,884 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2bdf7817-b52a-4836-b6ac-0e3a796ae0c8/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:38:41,913 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2bdf7817-b52a-4836-b6ac-0e3a796ae0c8/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-20 20:38:41,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:38:41,952 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 5 conjunts are in the unsatisfiable core [2022-11-20 20:38:41,953 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:38:42,014 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:38:42,015 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:38:42,181 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:38:42,182 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2038149280] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:38:42,182 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [321418503] [2022-11-20 20:38:42,203 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-20 20:38:42,204 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 20:38:42,211 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 20:38:42,217 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 20:38:42,218 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 20:38:42,573 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 26 for LOIs [2022-11-20 20:38:42,592 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 20:38:42,786 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '233#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-20 20:38:42,786 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 20:38:42,786 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 20:38:42,786 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 4, 4] total 9 [2022-11-20 20:38:42,787 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1296572511] [2022-11-20 20:38:42,787 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 20:38:42,787 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-11-20 20:38:42,787 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:38:42,788 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-11-20 20:38:42,788 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=184, Unknown=0, NotChecked=0, Total=240 [2022-11-20 20:38:42,789 INFO L87 Difference]: Start difference. First operand 13 states and 15 transitions. Second operand has 10 states, 10 states have (on average 1.8) internal successors, (18), 9 states have internal predecessors, (18), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:38:42,857 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:38:42,857 INFO L93 Difference]: Finished difference Result 27 states and 34 transitions. [2022-11-20 20:38:42,857 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-20 20:38:42,858 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 1.8) internal successors, (18), 9 states have internal predecessors, (18), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2022-11-20 20:38:42,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:38:42,858 INFO L225 Difference]: With dead ends: 27 [2022-11-20 20:38:42,859 INFO L226 Difference]: Without dead ends: 17 [2022-11-20 20:38:42,859 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 82 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=76, Invalid=230, Unknown=0, NotChecked=0, Total=306 [2022-11-20 20:38:42,860 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 1 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-20 20:38:42,861 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 45 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-20 20:38:42,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2022-11-20 20:38:42,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2022-11-20 20:38:42,865 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 14 states have internal predecessors, (16), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-20 20:38:42,866 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2022-11-20 20:38:42,866 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 9 [2022-11-20 20:38:42,866 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:38:42,866 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2022-11-20 20:38:42,866 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 1.8) internal successors, (18), 9 states have internal predecessors, (18), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:38:42,867 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2022-11-20 20:38:42,867 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-20 20:38:42,867 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:38:42,867 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:38:42,879 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2bdf7817-b52a-4836-b6ac-0e3a796ae0c8/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-20 20:38:43,073 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2bdf7817-b52a-4836-b6ac-0e3a796ae0c8/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:38:43,074 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:38:43,074 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:38:43,075 INFO L85 PathProgramCache]: Analyzing trace with hash -1115138546, now seen corresponding path program 2 times [2022-11-20 20:38:43,075 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:38:43,075 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [648863879] [2022-11-20 20:38:43,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:38:43,076 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:38:43,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:38:43,308 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:38:43,308 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:38:43,309 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [648863879] [2022-11-20 20:38:43,309 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [648863879] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 20:38:43,309 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [182064101] [2022-11-20 20:38:43,309 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 20:38:43,309 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:38:43,310 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2bdf7817-b52a-4836-b6ac-0e3a796ae0c8/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:38:43,311 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2bdf7817-b52a-4836-b6ac-0e3a796ae0c8/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:38:43,331 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2bdf7817-b52a-4836-b6ac-0e3a796ae0c8/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-20 20:38:43,373 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-20 20:38:43,373 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:38:43,374 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-20 20:38:43,376 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:38:43,419 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-20 20:38:43,419 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:38:43,558 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-20 20:38:43,559 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [182064101] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:38:43,559 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [883541918] [2022-11-20 20:38:43,562 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-20 20:38:43,562 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 20:38:43,562 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 20:38:43,563 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 20:38:43,563 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 20:38:43,843 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 34 for LOIs [2022-11-20 20:38:43,878 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 20:38:44,214 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '401#(and (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-20 20:38:44,217 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 20:38:44,218 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 20:38:44,218 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 4, 4] total 14 [2022-11-20 20:38:44,218 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1610669173] [2022-11-20 20:38:44,218 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 20:38:44,219 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-11-20 20:38:44,219 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:38:44,220 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-11-20 20:38:44,221 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=324, Unknown=0, NotChecked=0, Total=420 [2022-11-20 20:38:44,226 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand has 15 states, 15 states have (on average 1.4666666666666666) internal successors, (22), 14 states have internal predecessors, (22), 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) [2022-11-20 20:38:44,358 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:38:44,359 INFO L93 Difference]: Finished difference Result 35 states and 43 transitions. [2022-11-20 20:38:44,359 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-20 20:38:44,359 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.4666666666666666) internal successors, (22), 14 states have internal predecessors, (22), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2022-11-20 20:38:44,360 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:38:44,362 INFO L225 Difference]: With dead ends: 35 [2022-11-20 20:38:44,362 INFO L226 Difference]: Without dead ends: 22 [2022-11-20 20:38:44,365 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 137 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=148, Invalid=452, Unknown=0, NotChecked=0, Total=600 [2022-11-20 20:38:44,369 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 2 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 61 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-20 20:38:44,370 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 44 Invalid, 61 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-20 20:38:44,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2022-11-20 20:38:44,376 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2022-11-20 20:38:44,377 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 19 states have internal predecessors, (21), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-20 20:38:44,378 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2022-11-20 20:38:44,379 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 13 [2022-11-20 20:38:44,379 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:38:44,379 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2022-11-20 20:38:44,379 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.4666666666666666) internal successors, (22), 14 states have internal predecessors, (22), 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) [2022-11-20 20:38:44,380 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2022-11-20 20:38:44,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-11-20 20:38:44,381 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:38:44,381 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:38:44,391 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2bdf7817-b52a-4836-b6ac-0e3a796ae0c8/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-20 20:38:44,588 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2bdf7817-b52a-4836-b6ac-0e3a796ae0c8/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:38:44,588 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:38:44,589 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:38:44,589 INFO L85 PathProgramCache]: Analyzing trace with hash 197422010, now seen corresponding path program 3 times [2022-11-20 20:38:44,589 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:38:44,590 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1081079641] [2022-11-20 20:38:44,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:38:44,590 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:38:44,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:38:45,115 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:38:45,115 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:38:45,115 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1081079641] [2022-11-20 20:38:45,115 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1081079641] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 20:38:45,116 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [120535967] [2022-11-20 20:38:45,116 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-20 20:38:45,116 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:38:45,116 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2bdf7817-b52a-4836-b6ac-0e3a796ae0c8/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:38:45,119 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2bdf7817-b52a-4836-b6ac-0e3a796ae0c8/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:38:45,134 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2bdf7817-b52a-4836-b6ac-0e3a796ae0c8/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-20 20:38:45,196 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-20 20:38:45,196 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:38:45,197 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-20 20:38:45,199 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:38:45,344 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-20 20:38:45,344 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:38:45,656 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-20 20:38:45,656 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [120535967] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:38:45,656 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [566628429] [2022-11-20 20:38:45,660 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-20 20:38:45,660 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 20:38:45,661 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 20:38:45,661 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 20:38:45,661 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 20:38:45,880 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 34 for LOIs [2022-11-20 20:38:45,912 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 20:38:46,301 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '642#(and (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-20 20:38:46,301 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 20:38:46,302 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 20:38:46,302 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 8, 8] total 27 [2022-11-20 20:38:46,302 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [705020846] [2022-11-20 20:38:46,302 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 20:38:46,302 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-11-20 20:38:46,303 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:38:46,303 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-11-20 20:38:46,304 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=302, Invalid=820, Unknown=0, NotChecked=0, Total=1122 [2022-11-20 20:38:46,304 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand has 28 states, 28 states have (on average 1.25) internal successors, (35), 27 states have internal predecessors, (35), 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) [2022-11-20 20:38:46,632 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:38:46,632 INFO L93 Difference]: Finished difference Result 45 states and 57 transitions. [2022-11-20 20:38:46,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-11-20 20:38:46,633 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.25) internal successors, (35), 27 states have internal predecessors, (35), 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 18 [2022-11-20 20:38:46,633 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:38:46,634 INFO L225 Difference]: With dead ends: 45 [2022-11-20 20:38:46,634 INFO L226 Difference]: Without dead ends: 31 [2022-11-20 20:38:46,635 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 344 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=478, Invalid=1244, Unknown=0, NotChecked=0, Total=1722 [2022-11-20 20:38:46,636 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 3 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 66 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 112 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 66 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 20:38:46,636 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 52 Invalid, 112 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [66 Valid, 46 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-20 20:38:46,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2022-11-20 20:38:46,642 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2022-11-20 20:38:46,655 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 27 states have (on average 1.1111111111111112) internal successors, (30), 28 states have internal predecessors, (30), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-20 20:38:46,656 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 33 transitions. [2022-11-20 20:38:46,656 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 33 transitions. Word has length 18 [2022-11-20 20:38:46,657 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:38:46,657 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 33 transitions. [2022-11-20 20:38:46,657 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 1.25) internal successors, (35), 27 states have internal predecessors, (35), 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) [2022-11-20 20:38:46,658 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 33 transitions. [2022-11-20 20:38:46,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-11-20 20:38:46,658 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:38:46,659 INFO L195 NwaCegarLoop]: trace histogram [14, 6, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:38:46,680 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2bdf7817-b52a-4836-b6ac-0e3a796ae0c8/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-20 20:38:46,859 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2bdf7817-b52a-4836-b6ac-0e3a796ae0c8/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:38:46,859 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:38:46,860 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:38:46,860 INFO L85 PathProgramCache]: Analyzing trace with hash 958667022, now seen corresponding path program 4 times [2022-11-20 20:38:46,860 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:38:46,860 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [669394938] [2022-11-20 20:38:46,860 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:38:46,860 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:38:46,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:38:48,027 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:38:48,027 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:38:48,027 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [669394938] [2022-11-20 20:38:48,028 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [669394938] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 20:38:48,028 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1485271314] [2022-11-20 20:38:48,028 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-20 20:38:48,028 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:38:48,028 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2bdf7817-b52a-4836-b6ac-0e3a796ae0c8/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:38:48,030 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2bdf7817-b52a-4836-b6ac-0e3a796ae0c8/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:38:48,059 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2bdf7817-b52a-4836-b6ac-0e3a796ae0c8/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-20 20:38:48,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:38:48,114 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 16 conjunts are in the unsatisfiable core [2022-11-20 20:38:48,119 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:38:48,553 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-20 20:38:48,553 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:38:49,475 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-20 20:38:49,477 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1485271314] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:38:49,477 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1902840060] [2022-11-20 20:38:49,479 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-20 20:38:49,480 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 20:38:49,480 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 20:38:49,480 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 20:38:49,480 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 20:38:49,668 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 26 for LOIs [2022-11-20 20:38:49,681 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 20:38:49,995 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1008#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-20 20:38:49,995 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 20:38:49,995 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 20:38:49,995 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 16, 16] total 52 [2022-11-20 20:38:49,995 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2067443084] [2022-11-20 20:38:49,996 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 20:38:49,996 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2022-11-20 20:38:49,996 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:38:49,997 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2022-11-20 20:38:49,999 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1101, Invalid=2321, Unknown=0, NotChecked=0, Total=3422 [2022-11-20 20:38:50,000 INFO L87 Difference]: Start difference. First operand 31 states and 33 transitions. Second operand has 53 states, 53 states have (on average 1.1320754716981132) internal successors, (60), 52 states have internal predecessors, (60), 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) [2022-11-20 20:38:50,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:38:50,771 INFO L93 Difference]: Finished difference Result 63 states and 83 transitions. [2022-11-20 20:38:50,775 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2022-11-20 20:38:50,776 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 1.1320754716981132) internal successors, (60), 52 states have internal predecessors, (60), 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 27 [2022-11-20 20:38:50,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:38:50,777 INFO L225 Difference]: With dead ends: 63 [2022-11-20 20:38:50,777 INFO L226 Difference]: Without dead ends: 48 [2022-11-20 20:38:50,779 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 913 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1725, Invalid=3825, Unknown=0, NotChecked=0, Total=5550 [2022-11-20 20:38:50,780 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 4 mSDsluCounter, 59 mSDsCounter, 0 mSdLazyCounter, 74 mSolverCounterSat, 93 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 167 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 93 IncrementalHoareTripleChecker+Valid, 74 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 20:38:50,780 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 67 Invalid, 167 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [93 Valid, 74 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-20 20:38:50,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2022-11-20 20:38:50,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2022-11-20 20:38:50,787 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 44 states have (on average 1.0681818181818181) internal successors, (47), 45 states have internal predecessors, (47), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-20 20:38:50,789 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 50 transitions. [2022-11-20 20:38:50,789 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 50 transitions. Word has length 27 [2022-11-20 20:38:50,789 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:38:50,789 INFO L495 AbstractCegarLoop]: Abstraction has 48 states and 50 transitions. [2022-11-20 20:38:50,790 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 1.1320754716981132) internal successors, (60), 52 states have internal predecessors, (60), 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) [2022-11-20 20:38:50,790 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 50 transitions. [2022-11-20 20:38:50,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-11-20 20:38:50,791 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:38:50,791 INFO L195 NwaCegarLoop]: trace histogram [30, 7, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:38:50,796 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2bdf7817-b52a-4836-b6ac-0e3a796ae0c8/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-20 20:38:50,995 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2bdf7817-b52a-4836-b6ac-0e3a796ae0c8/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-11-20 20:38:50,995 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:38:50,996 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:38:50,996 INFO L85 PathProgramCache]: Analyzing trace with hash -1819206854, now seen corresponding path program 5 times [2022-11-20 20:38:50,996 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:38:50,996 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [695648754] [2022-11-20 20:38:50,996 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:38:50,997 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:38:51,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:38:54,317 INFO L134 CoverageAnalysis]: Checked inductivity of 493 backedges. 0 proven. 493 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:38:54,317 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:38:54,318 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [695648754] [2022-11-20 20:38:54,318 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [695648754] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 20:38:54,318 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1881472501] [2022-11-20 20:38:54,318 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 20:38:54,318 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:38:54,318 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2bdf7817-b52a-4836-b6ac-0e3a796ae0c8/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:38:54,334 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2bdf7817-b52a-4836-b6ac-0e3a796ae0c8/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:38:54,359 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2bdf7817-b52a-4836-b6ac-0e3a796ae0c8/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-20 20:38:54,448 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2022-11-20 20:38:54,449 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:38:54,451 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 32 conjunts are in the unsatisfiable core [2022-11-20 20:38:54,456 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:38:55,946 INFO L134 CoverageAnalysis]: Checked inductivity of 493 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-11-20 20:38:55,947 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:38:58,863 INFO L134 CoverageAnalysis]: Checked inductivity of 493 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-11-20 20:38:58,863 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1881472501] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:38:58,863 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [225832942] [2022-11-20 20:38:58,865 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-20 20:38:58,865 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 20:38:58,866 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 20:38:58,866 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 20:38:58,866 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 20:38:59,050 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 26 for LOIs [2022-11-20 20:38:59,062 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 20:38:59,568 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1611#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-20 20:38:59,568 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 20:38:59,568 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 20:38:59,569 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 32, 32] total 101 [2022-11-20 20:38:59,569 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [143173270] [2022-11-20 20:38:59,569 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 20:38:59,570 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 102 states [2022-11-20 20:38:59,570 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:38:59,572 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 102 interpolants. [2022-11-20 20:38:59,577 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4245, Invalid=7311, Unknown=0, NotChecked=0, Total=11556 [2022-11-20 20:38:59,578 INFO L87 Difference]: Start difference. First operand 48 states and 50 transitions. Second operand has 102 states, 102 states have (on average 1.0686274509803921) internal successors, (109), 101 states have internal predecessors, (109), 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) [2022-11-20 20:39:01,818 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:39:01,818 INFO L93 Difference]: Finished difference Result 97 states and 133 transitions. [2022-11-20 20:39:01,818 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2022-11-20 20:39:01,819 INFO L78 Accepts]: Start accepts. Automaton has has 102 states, 102 states have (on average 1.0686274509803921) internal successors, (109), 101 states have internal predecessors, (109), 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 44 [2022-11-20 20:39:01,819 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:39:01,820 INFO L225 Difference]: With dead ends: 97 [2022-11-20 20:39:01,820 INFO L226 Difference]: Without dead ends: 81 [2022-11-20 20:39:01,825 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2654 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=6549, Invalid=12911, Unknown=0, NotChecked=0, Total=19460 [2022-11-20 20:39:01,826 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 2 mSDsluCounter, 93 mSDsCounter, 0 mSdLazyCounter, 136 mSolverCounterSat, 195 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 331 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 195 IncrementalHoareTripleChecker+Valid, 136 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-20 20:39:01,826 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 101 Invalid, 331 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [195 Valid, 136 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-20 20:39:01,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2022-11-20 20:39:01,836 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 81. [2022-11-20 20:39:01,836 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 77 states have (on average 1.0389610389610389) internal successors, (80), 78 states have internal predecessors, (80), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-20 20:39:01,837 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 83 transitions. [2022-11-20 20:39:01,838 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 83 transitions. Word has length 44 [2022-11-20 20:39:01,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:39:01,838 INFO L495 AbstractCegarLoop]: Abstraction has 81 states and 83 transitions. [2022-11-20 20:39:01,839 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 102 states, 102 states have (on average 1.0686274509803921) internal successors, (109), 101 states have internal predecessors, (109), 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) [2022-11-20 20:39:01,839 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 83 transitions. [2022-11-20 20:39:01,840 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2022-11-20 20:39:01,840 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:39:01,841 INFO L195 NwaCegarLoop]: trace histogram [62, 8, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:39:01,847 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2bdf7817-b52a-4836-b6ac-0e3a796ae0c8/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-20 20:39:02,046 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2bdf7817-b52a-4836-b6ac-0e3a796ae0c8/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2022-11-20 20:39:02,046 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:39:02,047 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:39:02,047 INFO L85 PathProgramCache]: Analyzing trace with hash 1277203598, now seen corresponding path program 6 times [2022-11-20 20:39:02,047 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:39:02,047 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1433327645] [2022-11-20 20:39:02,047 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:39:02,048 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:39:02,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:39:10,957 INFO L134 CoverageAnalysis]: Checked inductivity of 1989 backedges. 0 proven. 1989 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:39:10,957 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:39:10,957 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1433327645] [2022-11-20 20:39:10,957 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1433327645] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 20:39:10,957 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [957466807] [2022-11-20 20:39:10,958 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-20 20:39:10,958 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:39:10,958 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2bdf7817-b52a-4836-b6ac-0e3a796ae0c8/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:39:10,962 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2bdf7817-b52a-4836-b6ac-0e3a796ae0c8/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:39:10,980 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2bdf7817-b52a-4836-b6ac-0e3a796ae0c8/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-20 20:39:11,108 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-20 20:39:11,108 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:39:11,111 INFO L263 TraceCheckSpWp]: Trace formula consists of 222 conjuncts, 64 conjunts are in the unsatisfiable core [2022-11-20 20:39:11,122 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:39:15,950 INFO L134 CoverageAnalysis]: Checked inductivity of 1989 backedges. 0 proven. 1953 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-20 20:39:15,950 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:39:27,129 INFO L134 CoverageAnalysis]: Checked inductivity of 1989 backedges. 0 proven. 1953 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-20 20:39:27,130 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [957466807] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:39:27,130 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [594458944] [2022-11-20 20:39:27,132 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-20 20:39:27,132 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 20:39:27,133 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 20:39:27,133 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 20:39:27,133 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 20:39:27,322 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 34 for LOIs [2022-11-20 20:39:27,348 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 20:39:28,232 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2675#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-20 20:39:28,233 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 20:39:28,233 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 20:39:28,233 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [72, 64, 64] total 198 [2022-11-20 20:39:28,233 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1782290767] [2022-11-20 20:39:28,233 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 20:39:28,234 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 199 states [2022-11-20 20:39:28,234 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:39:28,240 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 199 interpolants. [2022-11-20 20:39:28,246 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16702, Invalid=25118, Unknown=0, NotChecked=0, Total=41820 [2022-11-20 20:39:28,247 INFO L87 Difference]: Start difference. First operand 81 states and 83 transitions. Second operand has 199 states, 199 states have (on average 1.035175879396985) internal successors, (206), 198 states have internal predecessors, (206), 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) [2022-11-20 20:39:36,712 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:39:36,712 INFO L93 Difference]: Finished difference Result 163 states and 231 transitions. [2022-11-20 20:39:36,715 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 137 states. [2022-11-20 20:39:36,716 INFO L78 Accepts]: Start accepts. Automaton has has 199 states, 199 states have (on average 1.035175879396985) internal successors, (206), 198 states have internal predecessors, (206), 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 77 [2022-11-20 20:39:36,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:39:36,718 INFO L225 Difference]: With dead ends: 163 [2022-11-20 20:39:36,718 INFO L226 Difference]: Without dead ends: 146 [2022-11-20 20:39:36,726 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 365 GetRequests, 98 SyntacticMatches, 0 SemanticMatches, 267 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8499 ImplicationChecksByTransitivity, 25.6s TimeCoverageRelationStatistics Valid=25470, Invalid=46622, Unknown=0, NotChecked=0, Total=72092 [2022-11-20 20:39:36,727 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 3 mSDsluCounter, 51 mSDsCounter, 0 mSdLazyCounter, 189 mSolverCounterSat, 452 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 641 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 452 IncrementalHoareTripleChecker+Valid, 189 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-20 20:39:36,728 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 59 Invalid, 641 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [452 Valid, 189 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-20 20:39:36,728 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2022-11-20 20:39:36,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 146. [2022-11-20 20:39:36,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 146 states, 142 states have (on average 1.0211267605633803) internal successors, (145), 143 states have internal predecessors, (145), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-20 20:39:36,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 148 transitions. [2022-11-20 20:39:36,747 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 148 transitions. Word has length 77 [2022-11-20 20:39:36,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:39:36,747 INFO L495 AbstractCegarLoop]: Abstraction has 146 states and 148 transitions. [2022-11-20 20:39:36,748 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 199 states, 199 states have (on average 1.035175879396985) internal successors, (206), 198 states have internal predecessors, (206), 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) [2022-11-20 20:39:36,748 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 148 transitions. [2022-11-20 20:39:36,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2022-11-20 20:39:36,750 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:39:36,751 INFO L195 NwaCegarLoop]: trace histogram [126, 9, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:39:36,757 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2bdf7817-b52a-4836-b6ac-0e3a796ae0c8/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-20 20:39:36,957 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2bdf7817-b52a-4836-b6ac-0e3a796ae0c8/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2022-11-20 20:39:36,957 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:39:36,957 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:39:36,958 INFO L85 PathProgramCache]: Analyzing trace with hash 489773498, now seen corresponding path program 7 times [2022-11-20 20:39:36,958 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:39:36,958 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [10781328] [2022-11-20 20:39:36,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:39:36,958 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:39:37,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:40:05,930 INFO L134 CoverageAnalysis]: Checked inductivity of 8046 backedges. 0 proven. 8046 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:40:05,930 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:40:05,931 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [10781328] [2022-11-20 20:40:05,931 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [10781328] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 20:40:05,931 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1327015582] [2022-11-20 20:40:05,931 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-20 20:40:05,931 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:40:05,931 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2bdf7817-b52a-4836-b6ac-0e3a796ae0c8/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:40:05,940 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2bdf7817-b52a-4836-b6ac-0e3a796ae0c8/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:40:05,963 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2bdf7817-b52a-4836-b6ac-0e3a796ae0c8/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-20 20:40:06,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:40:06,133 INFO L263 TraceCheckSpWp]: Trace formula consists of 357 conjuncts, 128 conjunts are in the unsatisfiable core [2022-11-20 20:40:06,148 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:40:23,960 INFO L134 CoverageAnalysis]: Checked inductivity of 8046 backedges. 0 proven. 8001 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2022-11-20 20:40:23,960 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:40:59,816 INFO L134 CoverageAnalysis]: Checked inductivity of 8046 backedges. 0 proven. 8001 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2022-11-20 20:40:59,816 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1327015582] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:40:59,816 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [867435577] [2022-11-20 20:40:59,818 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-20 20:40:59,818 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 20:40:59,818 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 20:40:59,819 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 20:40:59,819 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 20:40:59,977 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 26 for LOIs [2022-11-20 20:40:59,986 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 20:41:01,197 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4648#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-20 20:41:01,197 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 20:41:01,197 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 20:41:01,197 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [137, 128, 128] total 391 [2022-11-20 20:41:01,198 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [626862794] [2022-11-20 20:41:01,198 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 20:41:01,199 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 392 states [2022-11-20 20:41:01,199 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:41:01,218 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 392 interpolants. [2022-11-20 20:41:01,230 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66248, Invalid=91758, Unknown=0, NotChecked=0, Total=158006 [2022-11-20 20:41:01,231 INFO L87 Difference]: Start difference. First operand 146 states and 148 transitions. Second operand has 392 states, 392 states have (on average 1.0178571428571428) internal successors, (399), 391 states have internal predecessors, (399), 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) [2022-11-20 20:41:30,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:41:30,957 INFO L93 Difference]: Finished difference Result 293 states and 425 transitions. [2022-11-20 20:41:30,957 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 266 states. [2022-11-20 20:41:30,958 INFO L78 Accepts]: Start accepts. Automaton has has 392 states, 392 states have (on average 1.0178571428571428) internal successors, (399), 391 states have internal predecessors, (399), 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 142 [2022-11-20 20:41:30,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:41:30,960 INFO L225 Difference]: With dead ends: 293 [2022-11-20 20:41:30,961 INFO L226 Difference]: Without dead ends: 275 [2022-11-20 20:41:30,975 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 689 GetRequests, 165 SyntacticMatches, 0 SemanticMatches, 524 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29528 ImplicationChecksByTransitivity, 88.2s TimeCoverageRelationStatistics Valid=100296, Invalid=175854, Unknown=0, NotChecked=0, Total=276150 [2022-11-20 20:41:30,976 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 4 mSDsluCounter, 80 mSDsCounter, 0 mSdLazyCounter, 373 mSolverCounterSat, 1289 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 1662 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1289 IncrementalHoareTripleChecker+Valid, 373 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-11-20 20:41:30,977 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 88 Invalid, 1662 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1289 Valid, 373 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-11-20 20:41:30,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 275 states. [2022-11-20 20:41:31,007 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 275 to 275. [2022-11-20 20:41:31,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 275 states, 271 states have (on average 1.011070110701107) internal successors, (274), 272 states have internal predecessors, (274), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-20 20:41:31,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 275 states to 275 states and 277 transitions. [2022-11-20 20:41:31,011 INFO L78 Accepts]: Start accepts. Automaton has 275 states and 277 transitions. Word has length 142 [2022-11-20 20:41:31,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:41:31,012 INFO L495 AbstractCegarLoop]: Abstraction has 275 states and 277 transitions. [2022-11-20 20:41:31,013 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 392 states, 392 states have (on average 1.0178571428571428) internal successors, (399), 391 states have internal predecessors, (399), 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) [2022-11-20 20:41:31,013 INFO L276 IsEmpty]: Start isEmpty. Operand 275 states and 277 transitions. [2022-11-20 20:41:31,019 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 272 [2022-11-20 20:41:31,019 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:41:31,020 INFO L195 NwaCegarLoop]: trace histogram [254, 10, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:41:31,032 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2bdf7817-b52a-4836-b6ac-0e3a796ae0c8/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-20 20:41:31,226 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2bdf7817-b52a-4836-b6ac-0e3a796ae0c8/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:41:31,227 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:41:31,227 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:41:31,227 INFO L85 PathProgramCache]: Analyzing trace with hash 1269568014, now seen corresponding path program 8 times [2022-11-20 20:41:31,227 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:41:31,227 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [788426455] [2022-11-20 20:41:31,227 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:41:31,228 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:41:31,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:44:24,887 INFO L134 CoverageAnalysis]: Checked inductivity of 32440 backedges. 0 proven. 32440 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:44:24,887 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:44:24,887 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [788426455] [2022-11-20 20:44:24,887 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [788426455] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 20:44:24,887 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1412831827] [2022-11-20 20:44:24,888 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 20:44:24,888 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:44:24,888 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2bdf7817-b52a-4836-b6ac-0e3a796ae0c8/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:44:24,889 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2bdf7817-b52a-4836-b6ac-0e3a796ae0c8/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:44:24,892 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2bdf7817-b52a-4836-b6ac-0e3a796ae0c8/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-20 20:44:25,094 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-11-20 20:44:25,094 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:44:25,097 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 28 conjunts are in the unsatisfiable core [2022-11-20 20:44:25,105 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:44:27,350 INFO L134 CoverageAnalysis]: Checked inductivity of 32440 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 32385 trivial. 0 not checked. [2022-11-20 20:44:27,351 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:44:28,563 INFO L134 CoverageAnalysis]: Checked inductivity of 32440 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 32410 trivial. 0 not checked. [2022-11-20 20:44:28,564 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1412831827] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:44:28,564 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1238127214] [2022-11-20 20:44:28,566 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-20 20:44:28,566 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 20:44:28,567 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 20:44:28,567 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 20:44:28,567 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 20:44:28,806 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 26 for LOIs [2022-11-20 20:44:28,822 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 20:44:30,532 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7933#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-20 20:44:30,533 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 20:44:30,533 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 20:44:30,533 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [266, 14, 5] total 283 [2022-11-20 20:44:30,533 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1517287463] [2022-11-20 20:44:30,533 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 20:44:30,534 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 284 states [2022-11-20 20:44:30,534 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:44:30,542 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 284 interpolants. [2022-11-20 20:44:30,546 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35588, Invalid=48222, Unknown=0, NotChecked=0, Total=83810 [2022-11-20 20:44:30,547 INFO L87 Difference]: Start difference. First operand 275 states and 277 transitions. Second operand has 284 states, 284 states have (on average 1.0352112676056338) internal successors, (294), 281 states have internal predecessors, (294), 3 states have call successors, (3), 3 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:45:16,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:45:16,512 INFO L93 Difference]: Finished difference Result 291 states and 296 transitions. [2022-11-20 20:45:16,514 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 272 states. [2022-11-20 20:45:16,514 INFO L78 Accepts]: Start accepts. Automaton has has 284 states, 284 states have (on average 1.0352112676056338) internal successors, (294), 281 states have internal predecessors, (294), 3 states have call successors, (3), 3 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 271 [2022-11-20 20:45:16,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:45:16,517 INFO L225 Difference]: With dead ends: 291 [2022-11-20 20:45:16,517 INFO L226 Difference]: Without dead ends: 283 [2022-11-20 20:45:16,538 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1343 GetRequests, 789 SyntacticMatches, 0 SemanticMatches, 554 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41910 ImplicationChecksByTransitivity, 85.9s TimeCoverageRelationStatistics Valid=104285, Invalid=204295, Unknown=0, NotChecked=0, Total=308580 [2022-11-20 20:45:16,538 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 13 mSDsluCounter, 89 mSDsCounter, 0 mSdLazyCounter, 562 mSolverCounterSat, 772 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 100 SdHoareTripleChecker+Invalid, 1334 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 772 IncrementalHoareTripleChecker+Valid, 562 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-11-20 20:45:16,539 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 100 Invalid, 1334 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [772 Valid, 562 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-11-20 20:45:16,540 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 283 states. [2022-11-20 20:45:16,575 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 283 to 282. [2022-11-20 20:45:16,576 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 282 states, 276 states have (on average 1.0144927536231885) internal successors, (280), 278 states have internal predecessors, (280), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-20 20:45:16,578 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 282 states to 282 states and 285 transitions. [2022-11-20 20:45:16,579 INFO L78 Accepts]: Start accepts. Automaton has 282 states and 285 transitions. Word has length 271 [2022-11-20 20:45:16,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:45:16,580 INFO L495 AbstractCegarLoop]: Abstraction has 282 states and 285 transitions. [2022-11-20 20:45:16,580 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 284 states, 284 states have (on average 1.0352112676056338) internal successors, (294), 281 states have internal predecessors, (294), 3 states have call successors, (3), 3 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:45:16,580 INFO L276 IsEmpty]: Start isEmpty. Operand 282 states and 285 transitions. [2022-11-20 20:45:16,586 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 273 [2022-11-20 20:45:16,586 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:45:16,586 INFO L195 NwaCegarLoop]: trace histogram [254, 11, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:45:16,596 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2bdf7817-b52a-4836-b6ac-0e3a796ae0c8/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2022-11-20 20:45:16,796 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2bdf7817-b52a-4836-b6ac-0e3a796ae0c8/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-20 20:45:16,796 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:45:16,797 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:45:16,797 INFO L85 PathProgramCache]: Analyzing trace with hash -176040902, now seen corresponding path program 9 times [2022-11-20 20:45:16,797 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:45:16,797 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [420634236] [2022-11-20 20:45:16,797 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:45:16,797 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:45:17,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:47:57,145 INFO L134 CoverageAnalysis]: Checked inductivity of 32451 backedges. 0 proven. 32451 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:47:57,146 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:47:57,146 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [420634236] [2022-11-20 20:47:57,146 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [420634236] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 20:47:57,146 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [995876091] [2022-11-20 20:47:57,146 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-20 20:47:57,147 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:47:57,147 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2bdf7817-b52a-4836-b6ac-0e3a796ae0c8/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:47:57,158 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2bdf7817-b52a-4836-b6ac-0e3a796ae0c8/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:47:57,164 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2bdf7817-b52a-4836-b6ac-0e3a796ae0c8/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-20 20:47:57,505 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-20 20:47:57,505 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:47:57,516 INFO L263 TraceCheckSpWp]: Trace formula consists of 627 conjuncts, 256 conjunts are in the unsatisfiable core [2022-11-20 20:47:57,534 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:49:23,170 INFO L134 CoverageAnalysis]: Checked inductivity of 32451 backedges. 0 proven. 32385 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2022-11-20 20:49:23,170 INFO L328 TraceCheckSpWp]: Computing backward predicates...