./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/ps4-ll_unwindbound20.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 38b53e6a Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/ps4-ll_unwindbound20.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur --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 99e5cccea54789cc7c8b01ece41ae38ca7afc8c38f73e2884988b8ff4c6bfc25 --- 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-38b53e6 [2022-11-26 00:30:44,296 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-26 00:30:44,299 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-26 00:30:44,340 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-26 00:30:44,340 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-26 00:30:44,344 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-26 00:30:44,347 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-26 00:30:44,349 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-26 00:30:44,351 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-26 00:30:44,357 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-26 00:30:44,358 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-26 00:30:44,360 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-26 00:30:44,361 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-26 00:30:44,363 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-26 00:30:44,364 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-26 00:30:44,365 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-26 00:30:44,368 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-26 00:30:44,368 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-26 00:30:44,370 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-26 00:30:44,376 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-26 00:30:44,378 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-26 00:30:44,381 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-26 00:30:44,383 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-26 00:30:44,384 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-26 00:30:44,393 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-26 00:30:44,394 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-26 00:30:44,395 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-26 00:30:44,397 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-26 00:30:44,397 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-26 00:30:44,399 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-26 00:30:44,400 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-26 00:30:44,401 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-26 00:30:44,403 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-26 00:30:44,404 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-26 00:30:44,404 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-26 00:30:44,405 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-26 00:30:44,406 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-26 00:30:44,406 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-26 00:30:44,406 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-26 00:30:44,408 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-26 00:30:44,409 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-26 00:30:44,410 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-26 00:30:44,449 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-26 00:30:44,449 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-26 00:30:44,450 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-26 00:30:44,450 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-26 00:30:44,451 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-26 00:30:44,451 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-26 00:30:44,452 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-26 00:30:44,452 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-26 00:30:44,452 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-26 00:30:44,452 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-26 00:30:44,453 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-26 00:30:44,454 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-26 00:30:44,454 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-26 00:30:44,454 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-26 00:30:44,454 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-26 00:30:44,454 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-26 00:30:44,455 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-26 00:30:44,455 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-26 00:30:44,456 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-26 00:30:44,457 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-26 00:30:44,457 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-26 00:30:44,458 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-26 00:30:44,458 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-26 00:30:44,458 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-26 00:30:44,458 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-26 00:30:44,458 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-26 00:30:44,459 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-26 00:30:44,459 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-26 00:30:44,459 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-26 00:30:44,460 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-26 00:30:44,460 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-26 00:30:44,460 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-26 00:30:44,461 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-26 00:30:44,461 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-26 00:30:44,461 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-26 00:30:44,461 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-26 00:30:44,461 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-26 00:30:44,462 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-26 00:30:44,462 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-26 00:30:44,462 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-26 00:30:44,462 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-26 00:30:44,462 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_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 99e5cccea54789cc7c8b01ece41ae38ca7afc8c38f73e2884988b8ff4c6bfc25 [2022-11-26 00:30:44,756 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-26 00:30:44,793 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-26 00:30:44,795 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-26 00:30:44,796 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-26 00:30:44,797 INFO L275 PluginConnector]: CDTParser initialized [2022-11-26 00:30:44,798 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/../../sv-benchmarks/c/nla-digbench-scaling/ps4-ll_unwindbound20.c [2022-11-26 00:30:47,879 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-26 00:30:48,079 INFO L351 CDTParser]: Found 1 translation units. [2022-11-26 00:30:48,080 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/sv-benchmarks/c/nla-digbench-scaling/ps4-ll_unwindbound20.c [2022-11-26 00:30:48,087 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/data/2d883f929/3dc44c6b92f040f9ab78ae516b518802/FLAG8cfff14c7 [2022-11-26 00:30:48,107 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/data/2d883f929/3dc44c6b92f040f9ab78ae516b518802 [2022-11-26 00:30:48,110 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-26 00:30:48,112 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-26 00:30:48,115 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-26 00:30:48,116 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-26 00:30:48,119 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-26 00:30:48,120 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.11 12:30:48" (1/1) ... [2022-11-26 00:30:48,122 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1223dd48 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:30:48, skipping insertion in model container [2022-11-26 00:30:48,122 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.11 12:30:48" (1/1) ... [2022-11-26 00:30:48,130 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-26 00:30:48,197 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-26 00:30:48,358 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_8fcc6fa8-9b18-48de-b787-228e26b73a88/sv-benchmarks/c/nla-digbench-scaling/ps4-ll_unwindbound20.c[458,471] [2022-11-26 00:30:48,374 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-26 00:30:48,384 INFO L203 MainTranslator]: Completed pre-run [2022-11-26 00:30:48,395 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_8fcc6fa8-9b18-48de-b787-228e26b73a88/sv-benchmarks/c/nla-digbench-scaling/ps4-ll_unwindbound20.c[458,471] [2022-11-26 00:30:48,401 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-26 00:30:48,414 INFO L208 MainTranslator]: Completed translation [2022-11-26 00:30:48,414 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:30:48 WrapperNode [2022-11-26 00:30:48,414 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-26 00:30:48,415 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-26 00:30:48,415 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-26 00:30:48,415 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-26 00:30:48,423 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:30:48" (1/1) ... [2022-11-26 00:30:48,429 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:30:48" (1/1) ... [2022-11-26 00:30:48,445 INFO L138 Inliner]: procedures = 14, calls = 10, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 39 [2022-11-26 00:30:48,445 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-26 00:30:48,446 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-26 00:30:48,446 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-26 00:30:48,446 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-26 00:30:48,455 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:30:48" (1/1) ... [2022-11-26 00:30:48,456 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:30:48" (1/1) ... [2022-11-26 00:30:48,457 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:30:48" (1/1) ... [2022-11-26 00:30:48,457 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:30:48" (1/1) ... [2022-11-26 00:30:48,459 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:30:48" (1/1) ... [2022-11-26 00:30:48,463 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:30:48" (1/1) ... [2022-11-26 00:30:48,464 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:30:48" (1/1) ... [2022-11-26 00:30:48,465 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:30:48" (1/1) ... [2022-11-26 00:30:48,466 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-26 00:30:48,467 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-26 00:30:48,467 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-26 00:30:48,468 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-26 00:30:48,468 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:30:48" (1/1) ... [2022-11-26 00:30:48,479 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-26 00:30:48,491 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:30:48,508 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-26 00:30:48,530 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-26 00:30:48,551 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-26 00:30:48,551 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-26 00:30:48,551 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-26 00:30:48,551 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-26 00:30:48,551 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-11-26 00:30:48,552 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-11-26 00:30:48,625 INFO L235 CfgBuilder]: Building ICFG [2022-11-26 00:30:48,627 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-26 00:30:48,820 INFO L276 CfgBuilder]: Performing block encoding [2022-11-26 00:30:48,845 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-26 00:30:48,867 INFO L300 CfgBuilder]: Removed 1 assume(true) statements. [2022-11-26 00:30:48,869 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.11 12:30:48 BoogieIcfgContainer [2022-11-26 00:30:48,870 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-26 00:30:48,872 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-26 00:30:48,873 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-26 00:30:48,877 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-26 00:30:48,877 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 26.11 12:30:48" (1/3) ... [2022-11-26 00:30:48,878 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3bd76f7a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.11 12:30:48, skipping insertion in model container [2022-11-26 00:30:48,878 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:30:48" (2/3) ... [2022-11-26 00:30:48,878 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3bd76f7a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.11 12:30:48, skipping insertion in model container [2022-11-26 00:30:48,879 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.11 12:30:48" (3/3) ... [2022-11-26 00:30:48,880 INFO L112 eAbstractionObserver]: Analyzing ICFG ps4-ll_unwindbound20.c [2022-11-26 00:30:48,913 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-26 00:30:48,914 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-26 00:30:48,996 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-26 00:30:49,005 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;@c74fe49, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-26 00:30:49,006 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-26 00:30:49,010 INFO L276 IsEmpty]: Start isEmpty. Operand has 15 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 10 states have internal predecessors, (14), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-26 00:30:49,018 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-11-26 00:30:49,018 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:30:49,019 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-11-26 00:30:49,020 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:30:49,026 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:30:49,027 INFO L85 PathProgramCache]: Analyzing trace with hash -2099432067, now seen corresponding path program 1 times [2022-11-26 00:30:49,038 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:30:49,039 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [440480726] [2022-11-26 00:30:49,039 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:30:49,040 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:30:49,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:30:49,190 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:30:49,190 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [440480726] [2022-11-26 00:30:49,191 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unsupported non-linear arithmetic [2022-11-26 00:30:49,191 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [315567420] [2022-11-26 00:30:49,191 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:30:49,192 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:30:49,192 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:30:49,194 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:30:49,196 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-26 00:30:49,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:30:49,254 INFO L263 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 1 conjunts are in the unsatisfiable core [2022-11-26 00:30:49,258 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:30:49,280 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:30:49,280 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-26 00:30:49,281 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [315567420] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-26 00:30:49,281 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-26 00:30:49,282 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-26 00:30:49,284 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [996224814] [2022-11-26 00:30:49,285 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-26 00:30:49,290 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-11-26 00:30:49,290 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:30:49,320 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-11-26 00:30:49,320 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-26 00:30:49,323 INFO L87 Difference]: Start difference. First operand has 15 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 10 states have internal predecessors, (14), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 2 states, 2 states have (on average 2.5) internal successors, (5), 2 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-26 00:30:49,349 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:30:49,349 INFO L93 Difference]: Finished difference Result 29 states and 42 transitions. [2022-11-26 00:30:49,351 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-11-26 00:30:49,352 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 2.5) internal successors, (5), 2 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2022-11-26 00:30:49,353 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:30:49,360 INFO L225 Difference]: With dead ends: 29 [2022-11-26 00:30:49,360 INFO L226 Difference]: Without dead ends: 13 [2022-11-26 00:30:49,363 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-26 00:30:49,366 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 2 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 2 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 2 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-26 00:30:49,368 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 16 Invalid, 2 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 2 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-26 00:30:49,385 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2022-11-26 00:30:49,400 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2022-11-26 00:30:49,402 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 8 states have (on average 1.375) internal successors, (11), 9 states have internal predecessors, (11), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-26 00:30:49,403 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 16 transitions. [2022-11-26 00:30:49,404 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 16 transitions. Word has length 6 [2022-11-26 00:30:49,405 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:30:49,405 INFO L495 AbstractCegarLoop]: Abstraction has 13 states and 16 transitions. [2022-11-26 00:30:49,405 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 2.5) internal successors, (5), 2 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-26 00:30:49,405 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 16 transitions. [2022-11-26 00:30:49,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-11-26 00:30:49,407 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:30:49,407 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-11-26 00:30:49,419 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2022-11-26 00:30:49,612 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2022-11-26 00:30:49,613 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:30:49,613 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:30:49,614 INFO L85 PathProgramCache]: Analyzing trace with hash -1058308380, now seen corresponding path program 1 times [2022-11-26 00:30:49,614 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:30:49,614 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [77845150] [2022-11-26 00:30:49,614 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:30:49,614 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:30:49,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:30:49,654 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:30:49,654 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [77845150] [2022-11-26 00:30:49,655 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unsupported non-linear arithmetic [2022-11-26 00:30:49,655 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [622223794] [2022-11-26 00:30:49,655 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:30:49,655 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:30:49,656 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:30:49,661 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:30:49,663 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-26 00:30:49,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:30:49,707 INFO L263 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-26 00:30:49,708 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:30:49,757 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:30:49,757 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-26 00:30:49,757 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [622223794] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-26 00:30:49,758 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-26 00:30:49,758 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-26 00:30:49,758 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [317431450] [2022-11-26 00:30:49,758 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-26 00:30:49,759 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-26 00:30:49,759 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:30:49,760 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-26 00:30:49,761 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-26 00:30:49,761 INFO L87 Difference]: Start difference. First operand 13 states and 16 transitions. Second operand has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-26 00:30:49,778 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:30:49,779 INFO L93 Difference]: Finished difference Result 23 states and 27 transitions. [2022-11-26 00:30:49,779 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-26 00:30:49,780 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2022-11-26 00:30:49,780 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:30:49,780 INFO L225 Difference]: With dead ends: 23 [2022-11-26 00:30:49,781 INFO L226 Difference]: Without dead ends: 15 [2022-11-26 00:30:49,781 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-26 00:30:49,783 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 0 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 9 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-26 00:30:49,783 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 38 Invalid, 9 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-26 00:30:49,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2022-11-26 00:30:49,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2022-11-26 00:30:49,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 10 states have (on average 1.3) internal successors, (13), 11 states have internal predecessors, (13), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-26 00:30:49,788 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 18 transitions. [2022-11-26 00:30:49,789 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 18 transitions. Word has length 7 [2022-11-26 00:30:49,789 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:30:49,789 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 18 transitions. [2022-11-26 00:30:49,789 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-26 00:30:49,790 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 18 transitions. [2022-11-26 00:30:49,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-11-26 00:30:49,791 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:30:49,791 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-11-26 00:30:49,807 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-26 00:30:49,997 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:30:49,997 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:30:49,998 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:30:49,998 INFO L85 PathProgramCache]: Analyzing trace with hash -1056520920, now seen corresponding path program 1 times [2022-11-26 00:30:49,998 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:30:49,998 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1854477147] [2022-11-26 00:30:49,999 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:30:49,999 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:30:50,011 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-26 00:30:50,012 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1740576814] [2022-11-26 00:30:50,012 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:30:50,012 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:30:50,013 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:30:50,014 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:30:50,023 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-26 00:30:50,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:30:50,082 INFO L263 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-26 00:30:50,084 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:30:50,136 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:30:50,136 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-26 00:30:50,136 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:30:50,137 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1854477147] [2022-11-26 00:30:50,137 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-26 00:30:50,137 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1740576814] [2022-11-26 00:30:50,137 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1740576814] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-26 00:30:50,138 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-26 00:30:50,138 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-26 00:30:50,138 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1668646631] [2022-11-26 00:30:50,138 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-26 00:30:50,139 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-26 00:30:50,139 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:30:50,140 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-26 00:30:50,140 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-26 00:30:50,140 INFO L87 Difference]: Start difference. First operand 15 states and 18 transitions. Second operand has 5 states, 5 states have (on average 1.2) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-26 00:30:50,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:30:50,200 INFO L93 Difference]: Finished difference Result 25 states and 30 transitions. [2022-11-26 00:30:50,201 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-26 00:30:50,201 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.2) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2022-11-26 00:30:50,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:30:50,202 INFO L225 Difference]: With dead ends: 25 [2022-11-26 00:30:50,202 INFO L226 Difference]: Without dead ends: 21 [2022-11-26 00:30:50,203 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-26 00:30:50,204 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 6 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-26 00:30:50,204 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 41 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-26 00:30:50,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2022-11-26 00:30:50,211 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2022-11-26 00:30:50,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 15 states have internal predecessors, (17), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-26 00:30:50,212 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 24 transitions. [2022-11-26 00:30:50,212 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 24 transitions. Word has length 7 [2022-11-26 00:30:50,212 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:30:50,213 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 24 transitions. [2022-11-26 00:30:50,213 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.2) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-26 00:30:50,213 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 24 transitions. [2022-11-26 00:30:50,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-11-26 00:30:50,214 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:30:50,214 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 00:30:50,231 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-26 00:30:50,419 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:30:50,420 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:30:50,420 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:30:50,421 INFO L85 PathProgramCache]: Analyzing trace with hash -640052534, now seen corresponding path program 1 times [2022-11-26 00:30:50,421 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:30:50,421 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1318591599] [2022-11-26 00:30:50,421 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:30:50,421 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:30:50,433 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-26 00:30:50,434 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1012850977] [2022-11-26 00:30:50,434 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:30:50,434 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:30:50,434 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:30:50,436 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:30:50,454 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-26 00:30:50,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:30:50,488 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 5 conjunts are in the unsatisfiable core [2022-11-26 00:30:50,490 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:30:50,538 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:30:50,540 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:30:50,687 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:30:50,687 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:30:50,687 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1318591599] [2022-11-26 00:30:50,687 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-26 00:30:50,688 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1012850977] [2022-11-26 00:30:50,688 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1012850977] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:30:50,688 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1085398556] [2022-11-26 00:30:50,729 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-11-26 00:30:50,729 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:30:50,733 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:30:50,739 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:30:50,740 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:30:51,708 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 51 for LOIs [2022-11-26 00:30:51,838 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:30:52,760 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '350#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2022-11-26 00:30:52,760 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:30:52,760 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-26 00:30:52,761 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5] total 8 [2022-11-26 00:30:52,761 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1597483047] [2022-11-26 00:30:52,761 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-26 00:30:52,761 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-26 00:30:52,762 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:30:52,763 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-26 00:30:52,763 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=197, Unknown=0, NotChecked=0, Total=240 [2022-11-26 00:30:52,763 INFO L87 Difference]: Start difference. First operand 21 states and 24 transitions. Second operand has 8 states, 8 states have (on average 2.625) internal successors, (21), 8 states have internal predecessors, (21), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-26 00:30:52,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:30:52,907 INFO L93 Difference]: Finished difference Result 55 states and 65 transitions. [2022-11-26 00:30:52,908 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-11-26 00:30:52,908 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 8 states have internal predecessors, (21), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 15 [2022-11-26 00:30:52,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:30:52,911 INFO L225 Difference]: With dead ends: 55 [2022-11-26 00:30:52,911 INFO L226 Difference]: Without dead ends: 47 [2022-11-26 00:30:52,912 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=63, Invalid=279, Unknown=0, NotChecked=0, Total=342 [2022-11-26 00:30:52,913 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 29 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 40 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-26 00:30:52,914 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [29 Valid, 86 Invalid, 40 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-26 00:30:52,914 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2022-11-26 00:30:52,934 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 43. [2022-11-26 00:30:52,935 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 28 states have (on average 1.25) internal successors, (35), 31 states have internal predecessors, (35), 10 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2022-11-26 00:30:52,939 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 52 transitions. [2022-11-26 00:30:52,939 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 52 transitions. Word has length 15 [2022-11-26 00:30:52,939 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:30:52,939 INFO L495 AbstractCegarLoop]: Abstraction has 43 states and 52 transitions. [2022-11-26 00:30:52,940 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 8 states have internal predecessors, (21), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-26 00:30:52,940 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 52 transitions. [2022-11-26 00:30:52,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-11-26 00:30:52,941 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:30:52,941 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 00:30:52,952 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2022-11-26 00:30:53,146 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:30:53,147 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:30:53,147 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:30:53,147 INFO L85 PathProgramCache]: Analyzing trace with hash -638265074, now seen corresponding path program 1 times [2022-11-26 00:30:53,147 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:30:53,147 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [215611885] [2022-11-26 00:30:53,148 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:30:53,149 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:30:53,158 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-26 00:30:53,158 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1661998640] [2022-11-26 00:30:53,158 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:30:53,158 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:30:53,159 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:30:53,160 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:30:53,183 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-26 00:30:53,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:30:53,217 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-26 00:30:53,219 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:30:53,332 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:30:53,333 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:30:53,445 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:30:53,445 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:30:53,445 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [215611885] [2022-11-26 00:30:53,445 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-26 00:30:53,446 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1661998640] [2022-11-26 00:30:53,446 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1661998640] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:30:53,446 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [322228794] [2022-11-26 00:30:53,450 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-26 00:30:53,450 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:30:53,451 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:30:53,459 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:30:53,463 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:30:53,946 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2022-11-26 00:30:53,974 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:30:54,515 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '598#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:30:54,515 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:30:54,515 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-26 00:30:54,515 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6] total 11 [2022-11-26 00:30:54,516 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [272416549] [2022-11-26 00:30:54,516 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-26 00:30:54,517 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-11-26 00:30:54,517 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:30:54,518 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-11-26 00:30:54,518 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=281, Unknown=0, NotChecked=0, Total=342 [2022-11-26 00:30:54,518 INFO L87 Difference]: Start difference. First operand 43 states and 52 transitions. Second operand has 11 states, 11 states have (on average 2.0) internal successors, (22), 10 states have internal predecessors, (22), 4 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-26 00:30:54,658 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:30:54,658 INFO L93 Difference]: Finished difference Result 57 states and 65 transitions. [2022-11-26 00:30:54,659 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-26 00:30:54,659 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.0) internal successors, (22), 10 states have internal predecessors, (22), 4 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 15 [2022-11-26 00:30:54,659 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:30:54,660 INFO L225 Difference]: With dead ends: 57 [2022-11-26 00:30:54,660 INFO L226 Difference]: Without dead ends: 46 [2022-11-26 00:30:54,661 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=78, Invalid=342, Unknown=0, NotChecked=0, Total=420 [2022-11-26 00:30:54,662 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 20 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 73 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 73 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-26 00:30:54,662 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 42 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 73 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-26 00:30:54,663 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2022-11-26 00:30:54,670 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 40. [2022-11-26 00:30:54,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 30 states have (on average 1.1333333333333333) internal successors, (34), 30 states have internal predecessors, (34), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-11-26 00:30:54,672 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 43 transitions. [2022-11-26 00:30:54,672 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 43 transitions. Word has length 15 [2022-11-26 00:30:54,672 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:30:54,672 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 43 transitions. [2022-11-26 00:30:54,672 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.0) internal successors, (22), 10 states have internal predecessors, (22), 4 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-26 00:30:54,673 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 43 transitions. [2022-11-26 00:30:54,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-11-26 00:30:54,673 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:30:54,676 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2022-11-26 00:30:54,683 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-26 00:30:54,881 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:30:54,882 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:30:54,882 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:30:54,882 INFO L85 PathProgramCache]: Analyzing trace with hash -186597301, now seen corresponding path program 1 times [2022-11-26 00:30:54,882 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:30:54,883 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1750940657] [2022-11-26 00:30:54,883 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:30:54,883 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:30:54,892 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-26 00:30:54,893 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2111456311] [2022-11-26 00:30:54,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:30:54,893 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:30:54,893 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:30:54,894 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:30:54,911 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-26 00:30:54,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:30:54,945 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-26 00:30:54,947 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:30:55,077 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-26 00:30:55,077 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:30:59,181 WARN L837 $PredicateComparison]: unable to prove that (or (= (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~k~0#1|) (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1|)) (< |c_ULTIMATE.start_main_~c~0#1| |c_ULTIMATE.start_main_~k~0#1|) (not (= (mod (+ (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 2) (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 3) (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 3)) 4) 0))) is different from false [2022-11-26 00:31:15,295 WARN L859 $PredicateComparison]: unable to prove that (or (not (= |c___VERIFIER_assert_#in~cond| 0)) (forall ((|v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_22| Int) (|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_27| Int)) (or (= (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_27| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_27|) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_27| |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_22|)) (= (mod (+ (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_27| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_27| 3) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_27| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_27| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_27| 2) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_27| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_27| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_27| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_27| 3)) 4) 0)))) is different from true [2022-11-26 00:31:33,388 WARN L859 $PredicateComparison]: unable to prove that (or (not (= |c___VERIFIER_assert_#in~cond| 0)) (forall ((|v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_22| Int) (|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_27| Int)) (or (= (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_27| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_27|) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_27| |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_22|)) (= (mod (+ (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_27| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_27| 3) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_27| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_27| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_27| 2) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_27| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_27| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_27| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_27| 3)) 4) 0))) (= c___VERIFIER_assert_~cond 0)) is different from true [2022-11-26 00:31:41,461 WARN L837 $PredicateComparison]: unable to prove that (or (forall ((|ULTIMATE.start_main_~k~0#1| Int)) (or (not (< |c_ULTIMATE.start_main_~c~0#1| |ULTIMATE.start_main_~k~0#1|)) (< (+ |c_ULTIMATE.start_main_~c~0#1| 1) |ULTIMATE.start_main_~k~0#1|) (= (+ |ULTIMATE.start_main_~k~0#1| (* |c_ULTIMATE.start_main_~y~0#1| |ULTIMATE.start_main_~k~0#1|)) (+ (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1|) (* |c_ULTIMATE.start_main_~y~0#1| 2) 1)))) (not (= (mod (+ (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 2) (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 3) (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 3)) 4) 0))) is different from false [2022-11-26 00:31:43,493 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:31:43,493 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1750940657] [2022-11-26 00:31:43,493 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-26 00:31:43,493 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2111456311] [2022-11-26 00:31:43,494 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2111456311] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:31:43,494 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1086109018] [2022-11-26 00:31:43,496 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-11-26 00:31:43,496 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:31:43,496 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:31:43,496 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:31:43,497 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:31:43,924 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 62 for LOIs [2022-11-26 00:31:44,012 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:31:44,918 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '862#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:31:44,919 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:31:44,924 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-26 00:31:44,925 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2022-11-26 00:31:44,925 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1575642522] [2022-11-26 00:31:44,925 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-26 00:31:44,925 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-11-26 00:31:44,925 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:31:44,926 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-11-26 00:31:44,926 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=361, Unknown=4, NotChecked=164, Total=600 [2022-11-26 00:31:44,927 INFO L87 Difference]: Start difference. First operand 40 states and 43 transitions. Second operand has 9 states, 8 states have (on average 2.0) internal successors, (16), 8 states have internal predecessors, (16), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-26 00:31:45,067 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:31:45,067 INFO L93 Difference]: Finished difference Result 45 states and 47 transitions. [2022-11-26 00:31:45,069 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-26 00:31:45,070 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 2.0) internal successors, (16), 8 states have internal predecessors, (16), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 21 [2022-11-26 00:31:45,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:31:45,071 INFO L225 Difference]: With dead ends: 45 [2022-11-26 00:31:45,071 INFO L226 Difference]: Without dead ends: 40 [2022-11-26 00:31:45,071 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 4 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 9.1s TimeCoverageRelationStatistics Valid=92, Invalid=472, Unknown=4, NotChecked=188, Total=756 [2022-11-26 00:31:45,072 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 7 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 81 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 50 SdHoareTripleChecker+Invalid, 81 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 81 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-26 00:31:45,072 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 50 Invalid, 81 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 81 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-26 00:31:45,073 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2022-11-26 00:31:45,082 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2022-11-26 00:31:45,082 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 30 states have (on average 1.1) internal successors, (33), 30 states have internal predecessors, (33), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-11-26 00:31:45,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2022-11-26 00:31:45,085 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 21 [2022-11-26 00:31:45,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:31:45,086 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2022-11-26 00:31:45,086 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 2.0) internal successors, (16), 8 states have internal predecessors, (16), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-26 00:31:45,086 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2022-11-26 00:31:45,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-11-26 00:31:45,088 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:31:45,089 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1] [2022-11-26 00:31:45,099 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-26 00:31:45,294 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:31:45,295 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:31:45,295 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:31:45,295 INFO L85 PathProgramCache]: Analyzing trace with hash -648869455, now seen corresponding path program 2 times [2022-11-26 00:31:45,295 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:31:45,296 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1338786726] [2022-11-26 00:31:45,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:31:45,296 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:31:45,304 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-26 00:31:45,305 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2117829373] [2022-11-26 00:31:45,305 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-26 00:31:45,305 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:31:45,305 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:31:45,318 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:31:45,335 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-26 00:31:45,378 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-26 00:31:45,378 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 00:31:45,380 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-26 00:31:45,382 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:31:45,523 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 8 proven. 16 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-26 00:31:45,523 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:31:49,833 WARN L837 $PredicateComparison]: unable to prove that (or (forall ((|ULTIMATE.start_main_~k~0#1| Int)) (or (not (< |c_ULTIMATE.start_main_~c~0#1| |ULTIMATE.start_main_~k~0#1|)) (< (+ |c_ULTIMATE.start_main_~c~0#1| 1) |ULTIMATE.start_main_~k~0#1|) (= (+ |ULTIMATE.start_main_~k~0#1| (* |c_ULTIMATE.start_main_~y~0#1| |ULTIMATE.start_main_~k~0#1|)) (+ (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1|) (* |c_ULTIMATE.start_main_~y~0#1| 2) 1)))) (not (= (mod (+ (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 2) (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 3) (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 3)) 4) 0))) is different from false [2022-11-26 00:31:49,835 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:31:49,836 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1338786726] [2022-11-26 00:31:49,836 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-26 00:31:49,836 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2117829373] [2022-11-26 00:31:49,836 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2117829373] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:31:49,836 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [137941920] [2022-11-26 00:31:49,839 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-11-26 00:31:49,842 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:31:49,843 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:31:49,843 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:31:49,843 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:31:50,223 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 62 for LOIs [2022-11-26 00:31:50,315 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:31:51,247 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1135#(and (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:31:51,247 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:31:51,247 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-26 00:31:51,247 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2022-11-26 00:31:51,248 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [582761362] [2022-11-26 00:31:51,248 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-26 00:31:51,248 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-11-26 00:31:51,248 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:31:51,249 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-11-26 00:31:51,249 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=438, Unknown=1, NotChecked=42, Total=552 [2022-11-26 00:31:51,249 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand has 10 states, 9 states have (on average 2.111111111111111) internal successors, (19), 9 states have internal predecessors, (19), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-26 00:31:51,426 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:31:51,426 INFO L93 Difference]: Finished difference Result 45 states and 46 transitions. [2022-11-26 00:31:51,427 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-11-26 00:31:51,427 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 2.111111111111111) internal successors, (19), 9 states have internal predecessors, (19), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 29 [2022-11-26 00:31:51,427 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:31:51,428 INFO L225 Difference]: With dead ends: 45 [2022-11-26 00:31:51,428 INFO L226 Difference]: Without dead ends: 40 [2022-11-26 00:31:51,429 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=92, Invalid=561, Unknown=1, NotChecked=48, Total=702 [2022-11-26 00:31:51,430 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 6 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 130 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 81 SdHoareTripleChecker+Invalid, 130 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 130 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-26 00:31:51,430 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 81 Invalid, 130 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 130 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-26 00:31:51,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2022-11-26 00:31:51,437 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2022-11-26 00:31:51,437 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 30 states have (on average 1.0666666666666667) internal successors, (32), 30 states have internal predecessors, (32), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-11-26 00:31:51,438 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 41 transitions. [2022-11-26 00:31:51,438 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 41 transitions. Word has length 29 [2022-11-26 00:31:51,438 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:31:51,438 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 41 transitions. [2022-11-26 00:31:51,439 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 2.111111111111111) internal successors, (19), 9 states have internal predecessors, (19), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-26 00:31:51,439 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 41 transitions. [2022-11-26 00:31:51,440 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-11-26 00:31:51,440 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:31:51,440 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1] [2022-11-26 00:31:51,451 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-26 00:31:51,646 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:31:51,646 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:31:51,646 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:31:51,646 INFO L85 PathProgramCache]: Analyzing trace with hash -1028616937, now seen corresponding path program 3 times [2022-11-26 00:31:51,646 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:31:51,646 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [747895249] [2022-11-26 00:31:51,646 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:31:51,647 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:31:51,653 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-26 00:31:51,654 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1470005389] [2022-11-26 00:31:51,654 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-26 00:31:51,654 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:31:51,654 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:31:51,655 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:31:51,676 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-26 00:31:51,728 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-26 00:31:51,729 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 00:31:51,730 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 28 conjunts are in the unsatisfiable core [2022-11-26 00:31:51,747 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:31:51,930 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 13 proven. 28 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-26 00:31:51,930 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:31:56,203 WARN L837 $PredicateComparison]: unable to prove that (or (forall ((|ULTIMATE.start_main_~k~0#1| Int)) (or (not (< |c_ULTIMATE.start_main_~c~0#1| |ULTIMATE.start_main_~k~0#1|)) (< (+ |c_ULTIMATE.start_main_~c~0#1| 1) |ULTIMATE.start_main_~k~0#1|) (= (+ |ULTIMATE.start_main_~k~0#1| (* |c_ULTIMATE.start_main_~y~0#1| |ULTIMATE.start_main_~k~0#1|)) (+ (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1|) (* |c_ULTIMATE.start_main_~y~0#1| 2) 1)))) (not (= (mod (+ (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 2) (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 3) (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 3)) 4) 0))) is different from false [2022-11-26 00:31:56,205 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:31:56,205 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [747895249] [2022-11-26 00:31:56,206 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-26 00:31:56,206 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1470005389] [2022-11-26 00:31:56,206 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1470005389] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:31:56,206 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2135009151] [2022-11-26 00:31:56,208 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-11-26 00:31:56,208 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:31:56,208 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:31:56,208 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:31:56,209 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:31:56,579 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 62 for LOIs [2022-11-26 00:31:56,647 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:32:05,477 WARN L233 SmtUtils]: Spent 8.29s on a formula simplification. DAG size of input: 62 DAG size of output: 40 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-26 00:32:06,469 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1433#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:32:06,469 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:32:06,469 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-26 00:32:06,469 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2022-11-26 00:32:06,469 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [197848088] [2022-11-26 00:32:06,470 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-26 00:32:06,470 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-11-26 00:32:06,470 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:32:06,471 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-11-26 00:32:06,471 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=481, Unknown=1, NotChecked=44, Total=600 [2022-11-26 00:32:06,471 INFO L87 Difference]: Start difference. First operand 40 states and 41 transitions. Second operand has 11 states, 10 states have (on average 2.2) internal successors, (22), 10 states have internal predecessors, (22), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-11-26 00:32:06,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:32:06,695 INFO L93 Difference]: Finished difference Result 47 states and 49 transitions. [2022-11-26 00:32:06,695 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-26 00:32:06,696 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 2.2) internal successors, (22), 10 states have internal predecessors, (22), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 37 [2022-11-26 00:32:06,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:32:06,696 INFO L225 Difference]: With dead ends: 47 [2022-11-26 00:32:06,697 INFO L226 Difference]: Without dead ends: 42 [2022-11-26 00:32:06,697 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 12.1s TimeCoverageRelationStatistics Valid=95, Invalid=610, Unknown=1, NotChecked=50, Total=756 [2022-11-26 00:32:06,698 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 7 mSDsluCounter, 83 mSDsCounter, 0 mSdLazyCounter, 155 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 100 SdHoareTripleChecker+Invalid, 155 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 155 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-26 00:32:06,699 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 100 Invalid, 155 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 155 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-26 00:32:06,699 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2022-11-26 00:32:06,705 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2022-11-26 00:32:06,706 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 31 states have (on average 1.064516129032258) internal successors, (33), 31 states have internal predecessors, (33), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-11-26 00:32:06,706 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 44 transitions. [2022-11-26 00:32:06,707 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 44 transitions. Word has length 37 [2022-11-26 00:32:06,707 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:32:06,707 INFO L495 AbstractCegarLoop]: Abstraction has 42 states and 44 transitions. [2022-11-26 00:32:06,707 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 2.2) internal successors, (22), 10 states have internal predecessors, (22), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-11-26 00:32:06,707 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 44 transitions. [2022-11-26 00:32:06,708 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-11-26 00:32:06,708 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:32:06,709 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1] [2022-11-26 00:32:06,715 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-26 00:32:06,914 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:32:06,915 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:32:06,915 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:32:06,915 INFO L85 PathProgramCache]: Analyzing trace with hash 126888572, now seen corresponding path program 2 times [2022-11-26 00:32:06,915 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:32:06,915 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [12052437] [2022-11-26 00:32:06,915 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:32:06,915 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:32:06,933 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-26 00:32:06,933 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2012958837] [2022-11-26 00:32:06,934 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-26 00:32:06,934 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:32:06,934 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:32:06,935 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:32:06,937 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-26 00:32:06,991 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-11-26 00:32:06,991 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 00:32:06,992 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-26 00:32:06,994 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:32:07,084 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 8 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:32:07,084 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:32:07,191 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 8 proven. 32 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-11-26 00:32:07,192 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:32:07,192 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [12052437] [2022-11-26 00:32:07,192 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-26 00:32:07,192 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2012958837] [2022-11-26 00:32:07,192 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2012958837] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:32:07,192 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1873155100] [2022-11-26 00:32:07,194 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-11-26 00:32:07,194 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:32:07,194 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:32:07,194 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:32:07,195 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:32:07,567 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 51 for LOIs [2022-11-26 00:32:07,653 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:32:08,349 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1813#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:32:08,349 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:32:08,349 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-26 00:32:08,349 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8] total 14 [2022-11-26 00:32:08,349 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1402349431] [2022-11-26 00:32:08,350 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-26 00:32:08,350 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-26 00:32:08,350 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:32:08,351 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-26 00:32:08,351 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=368, Unknown=0, NotChecked=0, Total=462 [2022-11-26 00:32:08,352 INFO L87 Difference]: Start difference. First operand 42 states and 44 transitions. Second operand has 14 states, 14 states have (on average 3.4285714285714284) internal successors, (48), 14 states have internal predecessors, (48), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-11-26 00:32:08,627 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:32:08,627 INFO L93 Difference]: Finished difference Result 118 states and 124 transitions. [2022-11-26 00:32:08,628 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-11-26 00:32:08,628 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.4285714285714284) internal successors, (48), 14 states have internal predecessors, (48), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) Word has length 39 [2022-11-26 00:32:08,628 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:32:08,629 INFO L225 Difference]: With dead ends: 118 [2022-11-26 00:32:08,629 INFO L226 Difference]: Without dead ends: 113 [2022-11-26 00:32:08,630 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 204 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=207, Invalid=723, Unknown=0, NotChecked=0, Total=930 [2022-11-26 00:32:08,631 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 55 mSDsluCounter, 112 mSDsCounter, 0 mSdLazyCounter, 68 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 132 SdHoareTripleChecker+Invalid, 73 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 68 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-26 00:32:08,631 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [55 Valid, 132 Invalid, 73 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 68 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-26 00:32:08,631 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2022-11-26 00:32:08,644 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 88. [2022-11-26 00:32:08,645 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 66 states have (on average 1.106060606060606) internal successors, (73), 66 states have internal predecessors, (73), 11 states have call successors, (11), 11 states have call predecessors, (11), 10 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-11-26 00:32:08,646 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 94 transitions. [2022-11-26 00:32:08,646 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 94 transitions. Word has length 39 [2022-11-26 00:32:08,646 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:32:08,646 INFO L495 AbstractCegarLoop]: Abstraction has 88 states and 94 transitions. [2022-11-26 00:32:08,647 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 3.4285714285714284) internal successors, (48), 14 states have internal predecessors, (48), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-11-26 00:32:08,647 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 94 transitions. [2022-11-26 00:32:08,648 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-11-26 00:32:08,648 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:32:08,648 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1] [2022-11-26 00:32:08,659 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-26 00:32:08,854 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2022-11-26 00:32:08,854 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:32:08,854 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:32:08,854 INFO L85 PathProgramCache]: Analyzing trace with hash 387926653, now seen corresponding path program 4 times [2022-11-26 00:32:08,854 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:32:08,854 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1386492313] [2022-11-26 00:32:08,855 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:32:08,855 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:32:08,863 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-26 00:32:08,863 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1998444973] [2022-11-26 00:32:08,863 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-26 00:32:08,863 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:32:08,864 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:32:08,865 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:32:08,868 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-26 00:32:08,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:32:08,927 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 32 conjunts are in the unsatisfiable core [2022-11-26 00:32:08,929 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:32:09,149 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 21 proven. 41 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-11-26 00:32:09,149 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:32:45,481 WARN L859 $PredicateComparison]: unable to prove that (or (not (= |c___VERIFIER_assert_#in~cond| 0)) (forall ((|v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_71| Int) (|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_85| Int)) (or (= (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_85| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_85|) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_85| |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_71|)) (= (mod (+ (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_85| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_85| 3) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_85| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_85| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_85| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_85| 3) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_85| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_85| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_85| 2)) 4) 0)))) is different from true [2022-11-26 00:33:03,532 WARN L859 $PredicateComparison]: unable to prove that (or (not (= |c___VERIFIER_assert_#in~cond| 0)) (forall ((|v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_71| Int) (|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_85| Int)) (or (= (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_85| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_85|) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_85| |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_71|)) (= (mod (+ (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_85| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_85| 3) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_85| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_85| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_85| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_85| 3) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_85| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_85| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_85| 2)) 4) 0))) (= c___VERIFIER_assert_~cond 0)) is different from true [2022-11-26 00:33:11,601 WARN L837 $PredicateComparison]: unable to prove that (or (forall ((|ULTIMATE.start_main_~k~0#1| Int)) (or (not (< |c_ULTIMATE.start_main_~c~0#1| |ULTIMATE.start_main_~k~0#1|)) (< (+ |c_ULTIMATE.start_main_~c~0#1| 1) |ULTIMATE.start_main_~k~0#1|) (= (+ |ULTIMATE.start_main_~k~0#1| (* |c_ULTIMATE.start_main_~y~0#1| |ULTIMATE.start_main_~k~0#1|)) (+ (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1|) (* |c_ULTIMATE.start_main_~y~0#1| 2) 1)))) (not (= (mod (+ (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 2) (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 3) (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 3)) 4) 0))) is different from false [2022-11-26 00:33:13,640 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:33:13,640 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1386492313] [2022-11-26 00:33:13,640 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-26 00:33:13,641 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1998444973] [2022-11-26 00:33:13,641 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1998444973] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:33:13,641 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [85105859] [2022-11-26 00:33:13,646 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-11-26 00:33:13,646 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:33:13,647 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:33:13,647 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:33:13,647 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:33:14,009 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 62 for LOIs [2022-11-26 00:33:14,080 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:33:15,282 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2316#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2022-11-26 00:33:15,282 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:33:15,283 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-26 00:33:15,283 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2022-11-26 00:33:15,283 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [554363370] [2022-11-26 00:33:15,283 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-26 00:33:15,284 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-11-26 00:33:15,284 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:33:15,284 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-11-26 00:33:15,285 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=522, Unknown=8, NotChecked=144, Total=756 [2022-11-26 00:33:15,285 INFO L87 Difference]: Start difference. First operand 88 states and 94 transitions. Second operand has 12 states, 11 states have (on average 2.272727272727273) internal successors, (25), 11 states have internal predecessors, (25), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-11-26 00:33:15,533 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:33:15,533 INFO L93 Difference]: Finished difference Result 93 states and 98 transitions. [2022-11-26 00:33:15,535 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-26 00:33:15,535 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 2.272727272727273) internal successors, (25), 11 states have internal predecessors, (25), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Word has length 45 [2022-11-26 00:33:15,535 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:33:15,537 INFO L225 Difference]: With dead ends: 93 [2022-11-26 00:33:15,537 INFO L226 Difference]: Without dead ends: 88 [2022-11-26 00:33:15,537 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 77 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 3 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 21.5s TimeCoverageRelationStatistics Valid=104, Invalid=656, Unknown=8, NotChecked=162, Total=930 [2022-11-26 00:33:15,538 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 7 mSDsluCounter, 111 mSDsCounter, 0 mSdLazyCounter, 201 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 131 SdHoareTripleChecker+Invalid, 201 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 201 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-26 00:33:15,538 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 131 Invalid, 201 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 201 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-26 00:33:15,544 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2022-11-26 00:33:15,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2022-11-26 00:33:15,564 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 66 states have (on average 1.0909090909090908) internal successors, (72), 66 states have internal predecessors, (72), 11 states have call successors, (11), 11 states have call predecessors, (11), 10 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-11-26 00:33:15,566 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 93 transitions. [2022-11-26 00:33:15,569 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 93 transitions. Word has length 45 [2022-11-26 00:33:15,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:33:15,572 INFO L495 AbstractCegarLoop]: Abstraction has 88 states and 93 transitions. [2022-11-26 00:33:15,573 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 2.272727272727273) internal successors, (25), 11 states have internal predecessors, (25), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-11-26 00:33:15,573 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 93 transitions. [2022-11-26 00:33:15,574 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2022-11-26 00:33:15,578 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:33:15,578 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 6, 5, 1, 1, 1, 1, 1] [2022-11-26 00:33:15,589 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-26 00:33:15,783 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:33:15,784 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:33:15,784 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:33:15,784 INFO L85 PathProgramCache]: Analyzing trace with hash -1228586525, now seen corresponding path program 5 times [2022-11-26 00:33:15,784 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:33:15,784 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [346853985] [2022-11-26 00:33:15,784 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:33:15,784 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:33:15,792 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-26 00:33:15,793 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [599388461] [2022-11-26 00:33:15,793 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-26 00:33:15,793 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:33:15,793 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:33:15,794 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:33:15,807 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-26 00:33:15,890 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-11-26 00:33:15,890 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 00:33:15,891 INFO L263 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 36 conjunts are in the unsatisfiable core [2022-11-26 00:33:15,893 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:33:16,115 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 23 proven. 64 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2022-11-26 00:33:16,116 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:33:20,330 WARN L837 $PredicateComparison]: unable to prove that (or (forall ((|ULTIMATE.start_main_~k~0#1| Int)) (or (not (< |c_ULTIMATE.start_main_~c~0#1| |ULTIMATE.start_main_~k~0#1|)) (< (+ |c_ULTIMATE.start_main_~c~0#1| 1) |ULTIMATE.start_main_~k~0#1|) (= (+ |ULTIMATE.start_main_~k~0#1| (* |c_ULTIMATE.start_main_~y~0#1| |ULTIMATE.start_main_~k~0#1|)) (+ (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1|) (* |c_ULTIMATE.start_main_~y~0#1| 2) 1)))) (not (= (mod (+ (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 2) (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 3) (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 3)) 4) 0))) is different from false [2022-11-26 00:33:20,332 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:33:20,332 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [346853985] [2022-11-26 00:33:20,332 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-26 00:33:20,332 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [599388461] [2022-11-26 00:33:20,332 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [599388461] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:33:20,332 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1808562186] [2022-11-26 00:33:20,334 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-11-26 00:33:20,334 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:33:20,334 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:33:20,334 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:33:20,334 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:33:20,686 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 62 for LOIs [2022-11-26 00:33:20,750 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:33:24,752 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2796#(and (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:33:24,752 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:33:24,752 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-26 00:33:24,752 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2022-11-26 00:33:24,753 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1150755339] [2022-11-26 00:33:24,753 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-26 00:33:24,753 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-11-26 00:33:24,753 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:33:24,754 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-11-26 00:33:24,754 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=573, Unknown=1, NotChecked=48, Total=702 [2022-11-26 00:33:24,755 INFO L87 Difference]: Start difference. First operand 88 states and 93 transitions. Second operand has 13 states, 12 states have (on average 2.3333333333333335) internal successors, (28), 12 states have internal predecessors, (28), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-26 00:33:25,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:33:25,050 INFO L93 Difference]: Finished difference Result 93 states and 97 transitions. [2022-11-26 00:33:25,055 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-26 00:33:25,055 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 2.3333333333333335) internal successors, (28), 12 states have internal predecessors, (28), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Word has length 53 [2022-11-26 00:33:25,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:33:25,059 INFO L225 Difference]: With dead ends: 93 [2022-11-26 00:33:25,059 INFO L226 Difference]: Without dead ends: 88 [2022-11-26 00:33:25,060 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=101, Invalid=714, Unknown=1, NotChecked=54, Total=870 [2022-11-26 00:33:25,061 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 6 mSDsluCounter, 157 mSDsCounter, 0 mSdLazyCounter, 277 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 180 SdHoareTripleChecker+Invalid, 277 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 277 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-26 00:33:25,061 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 180 Invalid, 277 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 277 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-26 00:33:25,062 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2022-11-26 00:33:25,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2022-11-26 00:33:25,091 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 66 states have (on average 1.0757575757575757) internal successors, (71), 66 states have internal predecessors, (71), 11 states have call successors, (11), 11 states have call predecessors, (11), 10 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-11-26 00:33:25,092 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 92 transitions. [2022-11-26 00:33:25,092 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 92 transitions. Word has length 53 [2022-11-26 00:33:25,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:33:25,093 INFO L495 AbstractCegarLoop]: Abstraction has 88 states and 92 transitions. [2022-11-26 00:33:25,093 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 2.3333333333333335) internal successors, (28), 12 states have internal predecessors, (28), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-26 00:33:25,093 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 92 transitions. [2022-11-26 00:33:25,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-11-26 00:33:25,094 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:33:25,094 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 7, 6, 1, 1, 1, 1, 1] [2022-11-26 00:33:25,100 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2022-11-26 00:33:25,300 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-11-26 00:33:25,300 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:33:25,300 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:33:25,301 INFO L85 PathProgramCache]: Analyzing trace with hash -70749367, now seen corresponding path program 6 times [2022-11-26 00:33:25,301 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:33:25,301 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1731498315] [2022-11-26 00:33:25,301 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:33:25,301 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:33:25,309 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-26 00:33:25,310 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1731839935] [2022-11-26 00:33:25,310 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-26 00:33:25,310 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:33:25,310 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:33:25,311 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:33:25,314 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-26 00:33:25,437 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-26 00:33:25,437 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 00:33:25,440 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 40 conjunts are in the unsatisfiable core [2022-11-26 00:33:25,442 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:33:25,692 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 16 proven. 100 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2022-11-26 00:33:25,692 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:33:25,884 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:33:25,884 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1731498315] [2022-11-26 00:33:25,885 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-26 00:33:25,885 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1731839935] [2022-11-26 00:33:25,885 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1731839935] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:33:25,885 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2027029353] [2022-11-26 00:33:25,887 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-11-26 00:33:25,887 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:33:25,887 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:33:25,887 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:33:25,888 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:33:26,248 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 62 for LOIs [2022-11-26 00:33:26,317 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:33:31,495 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3300#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:33:31,495 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:33:31,495 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-26 00:33:31,495 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2022-11-26 00:33:31,495 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1187765407] [2022-11-26 00:33:31,495 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-26 00:33:31,496 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-26 00:33:31,496 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:33:31,497 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-26 00:33:31,497 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=621, Unknown=1, NotChecked=0, Total=702 [2022-11-26 00:33:31,497 INFO L87 Difference]: Start difference. First operand 88 states and 92 transitions. Second operand has 14 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 13 states have internal predecessors, (31), 8 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2022-11-26 00:33:31,810 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:33:31,810 INFO L93 Difference]: Finished difference Result 93 states and 96 transitions. [2022-11-26 00:33:31,810 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-11-26 00:33:31,811 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 13 states have internal predecessors, (31), 8 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) Word has length 61 [2022-11-26 00:33:31,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:33:31,811 INFO L225 Difference]: With dead ends: 93 [2022-11-26 00:33:31,811 INFO L226 Difference]: Without dead ends: 88 [2022-11-26 00:33:31,812 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 110 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=101, Invalid=768, Unknown=1, NotChecked=0, Total=870 [2022-11-26 00:33:31,813 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 6 mSDsluCounter, 195 mSDsCounter, 0 mSdLazyCounter, 338 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 221 SdHoareTripleChecker+Invalid, 338 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 338 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-26 00:33:31,813 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 221 Invalid, 338 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 338 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-26 00:33:31,814 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2022-11-26 00:33:31,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2022-11-26 00:33:31,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 66 states have (on average 1.0606060606060606) internal successors, (70), 66 states have internal predecessors, (70), 11 states have call successors, (11), 11 states have call predecessors, (11), 10 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-11-26 00:33:31,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 91 transitions. [2022-11-26 00:33:31,825 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 91 transitions. Word has length 61 [2022-11-26 00:33:31,825 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:33:31,826 INFO L495 AbstractCegarLoop]: Abstraction has 88 states and 91 transitions. [2022-11-26 00:33:31,826 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 13 states have internal predecessors, (31), 8 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2022-11-26 00:33:31,826 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 91 transitions. [2022-11-26 00:33:31,827 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2022-11-26 00:33:31,827 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:33:31,827 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 8, 8, 8, 8, 7, 1, 1, 1, 1, 1] [2022-11-26 00:33:31,835 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-26 00:33:32,039 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:33:32,040 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:33:32,040 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:33:32,040 INFO L85 PathProgramCache]: Analyzing trace with hash -1169236305, now seen corresponding path program 7 times [2022-11-26 00:33:32,040 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:33:32,040 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1887117503] [2022-11-26 00:33:32,040 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:33:32,041 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:33:32,058 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-26 00:33:32,061 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1747037219] [2022-11-26 00:33:32,061 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-26 00:33:32,061 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:33:32,061 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:33:32,062 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:33:32,086 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-26 00:33:32,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:33:32,143 INFO L263 TraceCheckSpWp]: Trace formula consists of 206 conjuncts, 46 conjunts are in the unsatisfiable core [2022-11-26 00:33:32,146 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:33:32,495 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 36 proven. 113 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2022-11-26 00:33:32,495 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:34:04,710 WARN L859 $PredicateComparison]: unable to prove that (or (forall ((|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_142| Int) (|v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_116| Int)) (or (= (mod (+ (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_142| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_142| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_142| 2) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_142| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_142| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_142| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_142| 3) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_142| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_142| 3)) 4) 0) (= (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_142| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_142|) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_142| |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_116|)))) (not (= |c___VERIFIER_assert_#in~cond| 0))) is different from true [2022-11-26 00:34:22,760 WARN L859 $PredicateComparison]: unable to prove that (or (forall ((|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_142| Int) (|v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_116| Int)) (or (= (mod (+ (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_142| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_142| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_142| 2) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_142| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_142| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_142| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_142| 3) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_142| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_142| 3)) 4) 0) (= (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_142| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_142|) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_142| |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_116|)))) (not (= |c___VERIFIER_assert_#in~cond| 0)) (= c___VERIFIER_assert_~cond 0)) is different from true [2022-11-26 00:34:30,799 WARN L837 $PredicateComparison]: unable to prove that (or (= (+ (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1|) (* |c_ULTIMATE.start_main_~y~0#1| 2) 1) (+ (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~k~0#1|) |c_ULTIMATE.start_main_~k~0#1|)) (not (< |c_ULTIMATE.start_main_~c~0#1| |c_ULTIMATE.start_main_~k~0#1|)) (< (+ |c_ULTIMATE.start_main_~c~0#1| 1) |c_ULTIMATE.start_main_~k~0#1|) (not (= (mod (+ (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 2) (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 3) (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 3)) 4) 0))) is different from false [2022-11-26 00:36:52,917 WARN L837 $PredicateComparison]: unable to prove that (or (forall ((|ULTIMATE.start_main_~k~0#1| Int)) (or (<= |ULTIMATE.start_main_~k~0#1| (+ |c_ULTIMATE.start_main_~c~0#1| 6)) (< (+ |c_ULTIMATE.start_main_~c~0#1| 7) |ULTIMATE.start_main_~k~0#1|) (= (+ (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1|) 49 (* |c_ULTIMATE.start_main_~y~0#1| 14)) (+ (* |c_ULTIMATE.start_main_~y~0#1| |ULTIMATE.start_main_~k~0#1|) (* 7 |ULTIMATE.start_main_~k~0#1|))))) (not (= (mod (+ (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 2) (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 3) (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 3)) 4) 0))) is different from false [2022-11-26 00:36:54,943 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:36:54,943 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1887117503] [2022-11-26 00:36:54,944 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-26 00:36:54,944 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1747037219] [2022-11-26 00:36:54,944 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1747037219] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:36:54,944 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [920329793] [2022-11-26 00:36:54,946 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-11-26 00:36:54,946 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:36:54,946 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:36:54,946 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:36:54,947 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:36:55,279 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 62 for LOIs [2022-11-26 00:36:55,365 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:36:56,792 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3982#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:36:56,792 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:36:56,792 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-26 00:36:56,792 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2022-11-26 00:36:56,792 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1706773807] [2022-11-26 00:36:56,792 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-26 00:36:56,793 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-11-26 00:36:56,793 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:36:56,794 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-11-26 00:36:56,794 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=147, Invalid=903, Unknown=22, NotChecked=260, Total=1332 [2022-11-26 00:36:56,795 INFO L87 Difference]: Start difference. First operand 88 states and 91 transitions. Second operand has 15 states, 14 states have (on average 2.4285714285714284) internal successors, (34), 14 states have internal predecessors, (34), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-11-26 00:36:59,182 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:36:59,182 INFO L93 Difference]: Finished difference Result 93 states and 95 transitions. [2022-11-26 00:36:59,187 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-26 00:36:59,187 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 2.4285714285714284) internal successors, (34), 14 states have internal predecessors, (34), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) Word has length 69 [2022-11-26 00:36:59,188 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:36:59,192 INFO L225 Difference]: With dead ends: 93 [2022-11-26 00:36:59,193 INFO L226 Difference]: Without dead ends: 88 [2022-11-26 00:36:59,193 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 164 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 4 IntricatePredicates, 0 DeprecatedPredicates, 179 ImplicationChecksByTransitivity, 117.4s TimeCoverageRelationStatistics Valid=174, Invalid=1079, Unknown=23, NotChecked=284, Total=1560 [2022-11-26 00:36:59,196 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 7 mSDsluCounter, 219 mSDsCounter, 0 mSdLazyCounter, 375 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 248 SdHoareTripleChecker+Invalid, 375 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 375 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-26 00:36:59,197 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 248 Invalid, 375 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 375 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-26 00:36:59,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2022-11-26 00:36:59,212 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2022-11-26 00:36:59,213 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 66 states have (on average 1.0454545454545454) internal successors, (69), 66 states have internal predecessors, (69), 11 states have call successors, (11), 11 states have call predecessors, (11), 10 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-11-26 00:36:59,214 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 90 transitions. [2022-11-26 00:36:59,214 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 90 transitions. Word has length 69 [2022-11-26 00:36:59,216 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:36:59,216 INFO L495 AbstractCegarLoop]: Abstraction has 88 states and 90 transitions. [2022-11-26 00:36:59,216 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 2.4285714285714284) internal successors, (34), 14 states have internal predecessors, (34), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-11-26 00:36:59,216 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 90 transitions. [2022-11-26 00:36:59,224 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2022-11-26 00:36:59,224 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:36:59,224 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 9, 9, 9, 9, 8, 1, 1, 1, 1, 1] [2022-11-26 00:36:59,229 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-11-26 00:36:59,424 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:36:59,425 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:36:59,425 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:36:59,425 INFO L85 PathProgramCache]: Analyzing trace with hash 1082033173, now seen corresponding path program 8 times [2022-11-26 00:36:59,425 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:36:59,425 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1272616187] [2022-11-26 00:36:59,425 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:36:59,426 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:36:59,433 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-26 00:36:59,433 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1051644349] [2022-11-26 00:36:59,433 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-26 00:36:59,433 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:36:59,433 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:36:59,434 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:36:59,438 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-26 00:36:59,578 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2022-11-26 00:36:59,578 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 00:36:59,580 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 48 conjunts are in the unsatisfiable core [2022-11-26 00:36:59,582 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:36:59,898 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 32 proven. 154 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2022-11-26 00:36:59,898 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:37:00,123 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:37:00,123 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1272616187] [2022-11-26 00:37:00,123 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-26 00:37:00,123 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1051644349] [2022-11-26 00:37:00,123 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1051644349] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:37:00,124 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [58765486] [2022-11-26 00:37:00,125 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-11-26 00:37:00,125 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:37:00,126 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:37:00,126 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:37:00,126 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:37:00,453 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 62 for LOIs [2022-11-26 00:37:00,514 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:37:02,261 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4536#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:37:02,261 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:37:02,262 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-26 00:37:02,262 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2022-11-26 00:37:02,262 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [598998674] [2022-11-26 00:37:02,262 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-26 00:37:02,262 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-11-26 00:37:02,263 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:37:02,263 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-11-26 00:37:02,264 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=725, Unknown=0, NotChecked=0, Total=812 [2022-11-26 00:37:02,264 INFO L87 Difference]: Start difference. First operand 88 states and 90 transitions. Second operand has 16 states, 15 states have (on average 2.466666666666667) internal successors, (37), 15 states have internal predecessors, (37), 10 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-11-26 00:37:02,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:37:02,638 INFO L93 Difference]: Finished difference Result 93 states and 94 transitions. [2022-11-26 00:37:02,639 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-26 00:37:02,639 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 2.466666666666667) internal successors, (37), 15 states have internal predecessors, (37), 10 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) Word has length 77 [2022-11-26 00:37:02,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:37:02,640 INFO L225 Difference]: With dead ends: 93 [2022-11-26 00:37:02,640 INFO L226 Difference]: Without dead ends: 88 [2022-11-26 00:37:02,641 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 140 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=108, Invalid=884, Unknown=0, NotChecked=0, Total=992 [2022-11-26 00:37:02,641 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 7 mSDsluCounter, 263 mSDsCounter, 0 mSdLazyCounter, 445 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 295 SdHoareTripleChecker+Invalid, 445 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 445 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-26 00:37:02,641 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 295 Invalid, 445 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 445 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-26 00:37:02,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2022-11-26 00:37:02,653 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2022-11-26 00:37:02,653 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 66 states have (on average 1.0303030303030303) internal successors, (68), 66 states have internal predecessors, (68), 11 states have call successors, (11), 11 states have call predecessors, (11), 10 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-11-26 00:37:02,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 89 transitions. [2022-11-26 00:37:02,654 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 89 transitions. Word has length 77 [2022-11-26 00:37:02,654 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:37:02,655 INFO L495 AbstractCegarLoop]: Abstraction has 88 states and 89 transitions. [2022-11-26 00:37:02,655 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 2.466666666666667) internal successors, (37), 15 states have internal predecessors, (37), 10 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-11-26 00:37:02,655 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 89 transitions. [2022-11-26 00:37:02,656 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2022-11-26 00:37:02,656 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:37:02,656 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 10, 10, 10, 10, 9, 1, 1, 1, 1, 1] [2022-11-26 00:37:02,683 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-11-26 00:37:02,863 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-11-26 00:37:02,863 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:37:02,863 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:37:02,863 INFO L85 PathProgramCache]: Analyzing trace with hash 1451058043, now seen corresponding path program 9 times [2022-11-26 00:37:02,864 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:37:02,864 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1441209510] [2022-11-26 00:37:02,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:37:02,864 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:37:02,872 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-26 00:37:02,872 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [131209708] [2022-11-26 00:37:02,872 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-26 00:37:02,872 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:37:02,872 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:37:02,874 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:37:02,892 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-26 00:37:03,129 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-26 00:37:03,129 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 00:37:03,132 INFO L263 TraceCheckSpWp]: Trace formula consists of 248 conjuncts, 52 conjunts are in the unsatisfiable core [2022-11-26 00:37:03,133 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:37:03,466 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 19 proven. 208 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2022-11-26 00:37:03,466 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:37:03,696 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:37:03,696 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1441209510] [2022-11-26 00:37:03,696 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-26 00:37:03,697 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [131209708] [2022-11-26 00:37:03,697 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [131209708] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:37:03,697 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1899465552] [2022-11-26 00:37:03,698 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-11-26 00:37:03,698 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:37:03,699 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:37:03,699 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:37:03,699 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:37:04,024 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 62 for LOIs [2022-11-26 00:37:04,085 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:37:05,290 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5115#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:37:05,290 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:37:05,290 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-26 00:37:05,290 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2022-11-26 00:37:05,290 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [79242198] [2022-11-26 00:37:05,290 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-26 00:37:05,291 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-11-26 00:37:05,291 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:37:05,292 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-11-26 00:37:05,292 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=780, Unknown=0, NotChecked=0, Total=870 [2022-11-26 00:37:05,292 INFO L87 Difference]: Start difference. First operand 88 states and 89 transitions. Second operand has 17 states, 16 states have (on average 2.5) internal successors, (40), 16 states have internal predecessors, (40), 11 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-11-26 00:37:05,738 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:37:05,738 INFO L93 Difference]: Finished difference Result 95 states and 97 transitions. [2022-11-26 00:37:05,738 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-11-26 00:37:05,739 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 2.5) internal successors, (40), 16 states have internal predecessors, (40), 11 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) Word has length 85 [2022-11-26 00:37:05,739 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:37:05,739 INFO L225 Difference]: With dead ends: 95 [2022-11-26 00:37:05,739 INFO L226 Difference]: Without dead ends: 90 [2022-11-26 00:37:05,740 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 155 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=111, Invalid=945, Unknown=0, NotChecked=0, Total=1056 [2022-11-26 00:37:05,741 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 7 mSDsluCounter, 311 mSDsCounter, 0 mSdLazyCounter, 521 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 346 SdHoareTripleChecker+Invalid, 521 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 521 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-26 00:37:05,741 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 346 Invalid, 521 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 521 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-26 00:37:05,741 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2022-11-26 00:37:05,750 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 90. [2022-11-26 00:37:05,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 67 states have (on average 1.0298507462686568) internal successors, (69), 67 states have internal predecessors, (69), 12 states have call successors, (12), 11 states have call predecessors, (12), 10 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2022-11-26 00:37:05,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 92 transitions. [2022-11-26 00:37:05,752 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 92 transitions. Word has length 85 [2022-11-26 00:37:05,752 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:37:05,752 INFO L495 AbstractCegarLoop]: Abstraction has 90 states and 92 transitions. [2022-11-26 00:37:05,752 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 2.5) internal successors, (40), 16 states have internal predecessors, (40), 11 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-11-26 00:37:05,753 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 92 transitions. [2022-11-26 00:37:05,753 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2022-11-26 00:37:05,753 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:37:05,753 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1] [2022-11-26 00:37:05,759 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-11-26 00:37:05,954 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-11-26 00:37:05,954 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:37:05,954 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:37:05,955 INFO L85 PathProgramCache]: Analyzing trace with hash -612304928, now seen corresponding path program 3 times [2022-11-26 00:37:05,955 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:37:05,955 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1374092171] [2022-11-26 00:37:05,955 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:37:05,955 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:37:05,964 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-26 00:37:05,964 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1690344776] [2022-11-26 00:37:05,964 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-26 00:37:05,965 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:37:05,965 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:37:05,966 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:37:05,967 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-26 00:37:06,206 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-26 00:37:06,207 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 00:37:06,208 INFO L263 TraceCheckSpWp]: Trace formula consists of 259 conjuncts, 23 conjunts are in the unsatisfiable core [2022-11-26 00:37:06,210 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:37:06,387 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 20 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:37:06,388 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:37:06,645 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 20 proven. 200 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2022-11-26 00:37:06,645 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:37:06,646 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1374092171] [2022-11-26 00:37:06,646 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-26 00:37:06,646 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1690344776] [2022-11-26 00:37:06,646 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1690344776] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:37:06,646 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1066728672] [2022-11-26 00:37:06,648 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-11-26 00:37:06,648 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:37:06,648 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:37:06,648 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:37:06,648 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:37:06,965 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 51 for LOIs [2022-11-26 00:37:07,025 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:37:07,747 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5925#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:37:07,748 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:37:07,748 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-26 00:37:07,748 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14] total 24 [2022-11-26 00:37:07,748 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1775943350] [2022-11-26 00:37:07,748 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-26 00:37:07,748 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-11-26 00:37:07,749 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:37:07,749 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-11-26 00:37:07,750 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=259, Invalid=733, Unknown=0, NotChecked=0, Total=992 [2022-11-26 00:37:07,750 INFO L87 Difference]: Start difference. First operand 90 states and 92 transitions. Second operand has 24 states, 24 states have (on average 4.125) internal successors, (99), 24 states have internal predecessors, (99), 20 states have call successors, (21), 12 states have call predecessors, (21), 11 states have return successors, (20), 19 states have call predecessors, (20), 19 states have call successors, (20) [2022-11-26 00:37:08,331 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:37:08,332 INFO L93 Difference]: Finished difference Result 218 states and 228 transitions. [2022-11-26 00:37:08,332 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2022-11-26 00:37:08,332 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 4.125) internal successors, (99), 24 states have internal predecessors, (99), 20 states have call successors, (21), 12 states have call predecessors, (21), 11 states have return successors, (20), 19 states have call predecessors, (20), 19 states have call successors, (20) Word has length 87 [2022-11-26 00:37:08,333 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:37:08,334 INFO L225 Difference]: With dead ends: 218 [2022-11-26 00:37:08,334 INFO L226 Difference]: Without dead ends: 213 [2022-11-26 00:37:08,335 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 278 GetRequests, 227 SyntacticMatches, 2 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 538 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=688, Invalid=1862, Unknown=0, NotChecked=0, Total=2550 [2022-11-26 00:37:08,335 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 150 mSDsluCounter, 154 mSDsCounter, 0 mSdLazyCounter, 145 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 150 SdHoareTripleChecker+Valid, 184 SdHoareTripleChecker+Invalid, 171 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 145 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-26 00:37:08,336 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [150 Valid, 184 Invalid, 171 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 145 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-26 00:37:08,336 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 213 states. [2022-11-26 00:37:08,363 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 213 to 168. [2022-11-26 00:37:08,363 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 168 states, 126 states have (on average 1.0873015873015872) internal successors, (137), 126 states have internal predecessors, (137), 21 states have call successors, (21), 21 states have call predecessors, (21), 20 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2022-11-26 00:37:08,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 178 transitions. [2022-11-26 00:37:08,364 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 178 transitions. Word has length 87 [2022-11-26 00:37:08,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:37:08,365 INFO L495 AbstractCegarLoop]: Abstraction has 168 states and 178 transitions. [2022-11-26 00:37:08,365 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 4.125) internal successors, (99), 24 states have internal predecessors, (99), 20 states have call successors, (21), 12 states have call predecessors, (21), 11 states have return successors, (20), 19 states have call predecessors, (20), 19 states have call successors, (20) [2022-11-26 00:37:08,365 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 178 transitions. [2022-11-26 00:37:08,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2022-11-26 00:37:08,366 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:37:08,367 INFO L195 NwaCegarLoop]: trace histogram [12, 11, 11, 11, 11, 11, 11, 10, 1, 1, 1, 1, 1] [2022-11-26 00:37:08,377 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-11-26 00:37:08,572 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:37:08,573 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:37:08,573 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:37:08,573 INFO L85 PathProgramCache]: Analyzing trace with hash 1047624929, now seen corresponding path program 10 times [2022-11-26 00:37:08,573 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:37:08,573 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [387222674] [2022-11-26 00:37:08,573 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:37:08,573 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:37:08,581 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-26 00:37:08,581 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [526093289] [2022-11-26 00:37:08,581 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-26 00:37:08,581 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:37:08,581 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:37:08,582 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:37:08,607 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-11-26 00:37:08,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:37:08,736 INFO L263 TraceCheckSpWp]: Trace formula consists of 269 conjuncts, 56 conjunts are in the unsatisfiable core [2022-11-26 00:37:08,738 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:37:09,123 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 51 proven. 221 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2022-11-26 00:37:09,123 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:37:13,245 WARN L837 $PredicateComparison]: unable to prove that (or (= (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~k~0#1|) (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1|)) (< |c_ULTIMATE.start_main_~c~0#1| |c_ULTIMATE.start_main_~k~0#1|) (not (= (mod (+ (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 2) (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 3) (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 3)) 4) 0))) is different from false [2022-11-26 00:37:33,773 WARN L859 $PredicateComparison]: unable to prove that (or (not (= |c___VERIFIER_assert_#in~cond| 0)) (forall ((|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_224| Int) (|v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_171| Int)) (or (= (mod (+ (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_224| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_224| 3) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_224| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_224| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_224| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_224| 3) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_224| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_224| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_224| 2)) 4) 0) (= (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_224| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_224|) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_224| |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_171|))))) is different from true [2022-11-26 00:37:51,816 WARN L859 $PredicateComparison]: unable to prove that (or (not (= |c___VERIFIER_assert_#in~cond| 0)) (forall ((|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_224| Int) (|v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_171| Int)) (or (= (mod (+ (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_224| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_224| 3) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_224| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_224| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_224| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_224| 3) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_224| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_224| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_224| 2)) 4) 0) (= (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_224| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_224|) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_224| |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_171|)))) (= c___VERIFIER_assert_~cond 0)) is different from true [2022-11-26 00:37:59,880 WARN L837 $PredicateComparison]: unable to prove that (or (forall ((|ULTIMATE.start_main_~k~0#1| Int)) (or (not (< |c_ULTIMATE.start_main_~c~0#1| |ULTIMATE.start_main_~k~0#1|)) (< (+ |c_ULTIMATE.start_main_~c~0#1| 1) |ULTIMATE.start_main_~k~0#1|) (= (+ |ULTIMATE.start_main_~k~0#1| (* |c_ULTIMATE.start_main_~y~0#1| |ULTIMATE.start_main_~k~0#1|)) (+ (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1|) (* |c_ULTIMATE.start_main_~y~0#1| 2) 1)))) (not (= (mod (+ (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 2) (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 3) (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 3)) 4) 0))) is different from false [2022-11-26 00:38:01,901 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:38:01,902 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [387222674] [2022-11-26 00:38:01,902 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-26 00:38:01,902 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [526093289] [2022-11-26 00:38:01,902 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [526093289] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:38:01,902 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1184470389] [2022-11-26 00:38:01,903 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-11-26 00:38:01,904 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:38:01,904 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:38:01,904 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:38:01,904 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:38:02,233 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 62 for LOIs [2022-11-26 00:38:02,296 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:38:03,331 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6846#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:38:03,331 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:38:03,331 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-26 00:38:03,331 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2022-11-26 00:38:03,331 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [699661017] [2022-11-26 00:38:03,331 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-26 00:38:03,331 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-11-26 00:38:03,332 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:38:03,332 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-11-26 00:38:03,333 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=793, Unknown=4, NotChecked=236, Total=1122 [2022-11-26 00:38:03,333 INFO L87 Difference]: Start difference. First operand 168 states and 178 transitions. Second operand has 18 states, 17 states have (on average 2.5294117647058822) internal successors, (43), 17 states have internal predecessors, (43), 12 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2022-11-26 00:38:03,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:38:03,837 INFO L93 Difference]: Finished difference Result 173 states and 182 transitions. [2022-11-26 00:38:03,838 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-26 00:38:03,838 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 2.5294117647058822) internal successors, (43), 17 states have internal predecessors, (43), 12 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) Word has length 93 [2022-11-26 00:38:03,838 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:38:03,839 INFO L225 Difference]: With dead ends: 173 [2022-11-26 00:38:03,839 INFO L226 Difference]: Without dead ends: 168 [2022-11-26 00:38:03,840 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 167 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 4 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 9.4s TimeCoverageRelationStatistics Valid=110, Invalid=958, Unknown=4, NotChecked=260, Total=1332 [2022-11-26 00:38:03,840 INFO L413 NwaCegarLoop]: 38 mSDtfsCounter, 7 mSDsluCounter, 363 mSDsCounter, 0 mSdLazyCounter, 603 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 401 SdHoareTripleChecker+Invalid, 603 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 603 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-26 00:38:03,841 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 401 Invalid, 603 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 603 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-26 00:38:03,841 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2022-11-26 00:38:03,855 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 168. [2022-11-26 00:38:03,855 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 168 states, 126 states have (on average 1.0793650793650793) internal successors, (136), 126 states have internal predecessors, (136), 21 states have call successors, (21), 21 states have call predecessors, (21), 20 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2022-11-26 00:38:03,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 177 transitions. [2022-11-26 00:38:03,856 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 177 transitions. Word has length 93 [2022-11-26 00:38:03,856 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:38:03,856 INFO L495 AbstractCegarLoop]: Abstraction has 168 states and 177 transitions. [2022-11-26 00:38:03,857 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 2.5294117647058822) internal successors, (43), 17 states have internal predecessors, (43), 12 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2022-11-26 00:38:03,857 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 177 transitions. [2022-11-26 00:38:03,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2022-11-26 00:38:03,858 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:38:03,858 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 12, 12, 12, 12, 11, 1, 1, 1, 1, 1] [2022-11-26 00:38:03,867 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-11-26 00:38:04,064 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-11-26 00:38:04,064 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:38:04,065 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:38:04,065 INFO L85 PathProgramCache]: Analyzing trace with hash -1266626489, now seen corresponding path program 11 times [2022-11-26 00:38:04,065 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:38:04,065 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [54307563] [2022-11-26 00:38:04,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:38:04,065 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:38:04,072 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-26 00:38:04,073 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2003656429] [2022-11-26 00:38:04,073 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-26 00:38:04,073 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:38:04,073 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:38:04,074 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:38:04,083 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-11-26 00:38:04,336 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2022-11-26 00:38:04,336 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 00:38:04,339 INFO L263 TraceCheckSpWp]: Trace formula consists of 290 conjuncts, 60 conjunts are in the unsatisfiable core [2022-11-26 00:38:04,341 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:38:04,725 INFO L134 CoverageAnalysis]: Checked inductivity of 552 backedges. 38 proven. 283 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2022-11-26 00:38:04,725 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:38:04,961 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:38:04,961 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [54307563] [2022-11-26 00:38:04,962 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-26 00:38:04,962 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2003656429] [2022-11-26 00:38:04,962 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2003656429] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:38:04,962 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [931031220] [2022-11-26 00:38:04,967 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-11-26 00:38:04,967 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:38:04,968 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:38:04,969 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:38:04,969 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:38:05,276 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 62 for LOIs [2022-11-26 00:38:05,336 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:38:06,422 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7695#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:38:06,423 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:38:06,423 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-26 00:38:06,423 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2022-11-26 00:38:06,423 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [493135483] [2022-11-26 00:38:06,423 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-26 00:38:06,423 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-11-26 00:38:06,424 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:38:06,424 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-11-26 00:38:06,425 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=896, Unknown=0, NotChecked=0, Total=992 [2022-11-26 00:38:06,425 INFO L87 Difference]: Start difference. First operand 168 states and 177 transitions. Second operand has 19 states, 18 states have (on average 2.5555555555555554) internal successors, (46), 18 states have internal predecessors, (46), 13 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2022-11-26 00:38:06,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:38:06,984 INFO L93 Difference]: Finished difference Result 173 states and 181 transitions. [2022-11-26 00:38:06,984 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-11-26 00:38:06,985 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 2.5555555555555554) internal successors, (46), 18 states have internal predecessors, (46), 13 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) Word has length 101 [2022-11-26 00:38:06,985 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:38:06,986 INFO L225 Difference]: With dead ends: 173 [2022-11-26 00:38:06,986 INFO L226 Difference]: Without dead ends: 168 [2022-11-26 00:38:06,987 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 185 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=117, Invalid=1073, Unknown=0, NotChecked=0, Total=1190 [2022-11-26 00:38:06,987 INFO L413 NwaCegarLoop]: 41 mSDtfsCounter, 7 mSDsluCounter, 419 mSDsCounter, 0 mSdLazyCounter, 691 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 460 SdHoareTripleChecker+Invalid, 691 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 691 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-26 00:38:06,988 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 460 Invalid, 691 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 691 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-26 00:38:06,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2022-11-26 00:38:07,001 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 168. [2022-11-26 00:38:07,002 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 168 states, 126 states have (on average 1.0714285714285714) internal successors, (135), 126 states have internal predecessors, (135), 21 states have call successors, (21), 21 states have call predecessors, (21), 20 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2022-11-26 00:38:07,003 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 176 transitions. [2022-11-26 00:38:07,003 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 176 transitions. Word has length 101 [2022-11-26 00:38:07,003 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:38:07,003 INFO L495 AbstractCegarLoop]: Abstraction has 168 states and 176 transitions. [2022-11-26 00:38:07,004 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 18 states have (on average 2.5555555555555554) internal successors, (46), 18 states have internal predecessors, (46), 13 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2022-11-26 00:38:07,004 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 176 transitions. [2022-11-26 00:38:07,004 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2022-11-26 00:38:07,004 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:38:07,005 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 13, 13, 13, 13, 12, 1, 1, 1, 1, 1] [2022-11-26 00:38:07,011 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-11-26 00:38:07,205 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-11-26 00:38:07,205 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:38:07,206 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:38:07,206 INFO L85 PathProgramCache]: Analyzing trace with hash -288268883, now seen corresponding path program 12 times [2022-11-26 00:38:07,206 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:38:07,206 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1969457834] [2022-11-26 00:38:07,206 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:38:07,206 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:38:07,214 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-26 00:38:07,215 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2063391608] [2022-11-26 00:38:07,215 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-26 00:38:07,215 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:38:07,215 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:38:07,216 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:38:07,220 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-11-26 00:38:07,513 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-26 00:38:07,513 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 00:38:07,516 INFO L263 TraceCheckSpWp]: Trace formula consists of 311 conjuncts, 64 conjunts are in the unsatisfiable core [2022-11-26 00:38:07,518 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:38:07,928 INFO L134 CoverageAnalysis]: Checked inductivity of 650 backedges. 25 proven. 349 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2022-11-26 00:38:07,928 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:38:08,100 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:38:08,100 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1969457834] [2022-11-26 00:38:08,100 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-26 00:38:08,100 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2063391608] [2022-11-26 00:38:08,101 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2063391608] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:38:08,101 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [195427571] [2022-11-26 00:38:08,102 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-11-26 00:38:08,102 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:38:08,103 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:38:08,103 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:38:08,103 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:38:08,431 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 62 for LOIs [2022-11-26 00:38:08,495 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:38:09,757 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8569#(and (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:38:09,757 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:38:09,757 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-26 00:38:09,757 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2022-11-26 00:38:09,758 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [989619388] [2022-11-26 00:38:09,758 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-26 00:38:09,758 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-26 00:38:09,758 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:38:09,759 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-26 00:38:09,759 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=957, Unknown=0, NotChecked=0, Total=1056 [2022-11-26 00:38:09,760 INFO L87 Difference]: Start difference. First operand 168 states and 176 transitions. Second operand has 20 states, 19 states have (on average 2.5789473684210527) internal successors, (49), 19 states have internal predecessors, (49), 14 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2022-11-26 00:38:10,426 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:38:10,426 INFO L93 Difference]: Finished difference Result 173 states and 180 transitions. [2022-11-26 00:38:10,426 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-11-26 00:38:10,427 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 2.5789473684210527) internal successors, (49), 19 states have internal predecessors, (49), 14 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) Word has length 109 [2022-11-26 00:38:10,427 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:38:10,428 INFO L225 Difference]: With dead ends: 173 [2022-11-26 00:38:10,428 INFO L226 Difference]: Without dead ends: 168 [2022-11-26 00:38:10,429 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 234 GetRequests, 200 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=120, Invalid=1140, Unknown=0, NotChecked=0, Total=1260 [2022-11-26 00:38:10,430 INFO L413 NwaCegarLoop]: 44 mSDtfsCounter, 6 mSDsluCounter, 507 mSDsCounter, 0 mSdLazyCounter, 830 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 551 SdHoareTripleChecker+Invalid, 830 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 830 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-26 00:38:10,430 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 551 Invalid, 830 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 830 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-26 00:38:10,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2022-11-26 00:38:10,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 168. [2022-11-26 00:38:10,446 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 168 states, 126 states have (on average 1.0634920634920635) internal successors, (134), 126 states have internal predecessors, (134), 21 states have call successors, (21), 21 states have call predecessors, (21), 20 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2022-11-26 00:38:10,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 175 transitions. [2022-11-26 00:38:10,447 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 175 transitions. Word has length 109 [2022-11-26 00:38:10,447 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:38:10,447 INFO L495 AbstractCegarLoop]: Abstraction has 168 states and 175 transitions. [2022-11-26 00:38:10,448 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 2.5789473684210527) internal successors, (49), 19 states have internal predecessors, (49), 14 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2022-11-26 00:38:10,448 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 175 transitions. [2022-11-26 00:38:10,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2022-11-26 00:38:10,450 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:38:10,450 INFO L195 NwaCegarLoop]: trace histogram [15, 14, 14, 14, 14, 14, 14, 13, 1, 1, 1, 1, 1] [2022-11-26 00:38:10,459 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-11-26 00:38:10,657 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:38:10,658 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:38:10,658 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:38:10,658 INFO L85 PathProgramCache]: Analyzing trace with hash -1651956461, now seen corresponding path program 13 times [2022-11-26 00:38:10,658 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:38:10,658 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1591361228] [2022-11-26 00:38:10,659 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:38:10,659 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:38:10,667 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-26 00:38:10,667 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1027819629] [2022-11-26 00:38:10,667 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-26 00:38:10,667 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:38:10,668 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:38:10,669 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:38:10,677 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8fcc6fa8-9b18-48de-b787-228e26b73a88/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-11-26 00:38:10,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:38:10,850 INFO L263 TraceCheckSpWp]: Trace formula consists of 332 conjuncts, 68 conjunts are in the unsatisfiable core [2022-11-26 00:38:10,852 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:38:11,282 INFO L134 CoverageAnalysis]: Checked inductivity of 756 backedges. 66 proven. 365 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2022-11-26 00:38:11,282 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:38:53,606 WARN L859 $PredicateComparison]: unable to prove that (or (not (= |c___VERIFIER_assert_#in~cond| 0)) (forall ((|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_299| Int) (|v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_210| Int)) (or (= (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_299| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_299|) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_299| |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_210|)) (= (mod (+ (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_299| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_299| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_299| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_299| 3) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_299| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_299| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_299| 2) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_299| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_299| 3)) 4) 0)))) is different from true [2022-11-26 00:39:11,650 WARN L859 $PredicateComparison]: unable to prove that (or (not (= |c___VERIFIER_assert_#in~cond| 0)) (= c___VERIFIER_assert_~cond 0) (forall ((|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_299| Int) (|v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_210| Int)) (or (= (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_299| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_299|) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_299| |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_210|)) (= (mod (+ (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_299| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_299| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_299| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_299| 3) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_299| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_299| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_299| 2) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_299| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_299| 3)) 4) 0)))) is different from true [2022-11-26 00:39:19,693 WARN L837 $PredicateComparison]: unable to prove that (or (forall ((|ULTIMATE.start_main_~k~0#1| Int)) (or (not (< |c_ULTIMATE.start_main_~c~0#1| |ULTIMATE.start_main_~k~0#1|)) (< (+ |c_ULTIMATE.start_main_~c~0#1| 1) |ULTIMATE.start_main_~k~0#1|) (= (+ |ULTIMATE.start_main_~k~0#1| (* |c_ULTIMATE.start_main_~y~0#1| |ULTIMATE.start_main_~k~0#1|)) (+ (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1|) (* |c_ULTIMATE.start_main_~y~0#1| 2) 1)))) (not (= (mod (+ (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 2) (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 3) (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 3)) 4) 0))) is different from false [2022-11-26 00:39:21,716 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:39:21,716 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1591361228] [2022-11-26 00:39:21,716 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-26 00:39:21,717 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1027819629] [2022-11-26 00:39:21,717 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1027819629] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:39:21,717 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2131014483] [2022-11-26 00:39:21,718 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-11-26 00:39:21,718 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:39:21,718 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:39:21,719 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:39:21,719 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:39:22,003 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 62 for LOIs [2022-11-26 00:39:22,076 INFO L180 IcfgInterpreter]: Interpretation finished