./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_unwindbound50.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_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/config/AutomizerReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_unwindbound50.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R --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 Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 436f0a1b9da8affd8e76edc25dee0cffff5a08ff489ec96067821d6a4548518b --- 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 [2022-11-25 16:51:20,226 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-25 16:51:20,228 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-25 16:51:20,265 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-25 16:51:20,266 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-25 16:51:20,271 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-25 16:51:20,274 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-25 16:51:20,279 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-25 16:51:20,282 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-25 16:51:20,286 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-25 16:51:20,289 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-25 16:51:20,292 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-25 16:51:20,293 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-25 16:51:20,299 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-25 16:51:20,304 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-25 16:51:20,307 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-25 16:51:20,309 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-25 16:51:20,310 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-25 16:51:20,312 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-25 16:51:20,318 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-25 16:51:20,320 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-25 16:51:20,323 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-25 16:51:20,325 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-25 16:51:20,327 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-25 16:51:20,338 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-25 16:51:20,342 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-25 16:51:20,343 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-25 16:51:20,344 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-25 16:51:20,346 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-25 16:51:20,347 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-25 16:51:20,349 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-25 16:51:20,350 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-25 16:51:20,352 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-25 16:51:20,354 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-25 16:51:20,355 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-25 16:51:20,356 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-25 16:51:20,357 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-25 16:51:20,357 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-25 16:51:20,358 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-25 16:51:20,360 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-25 16:51:20,361 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-25 16:51:20,363 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/config/svcomp-Reach-32bit-Automizer_Default.epf [2022-11-25 16:51:20,416 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-25 16:51:20,416 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-25 16:51:20,417 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-25 16:51:20,418 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-25 16:51:20,419 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-25 16:51:20,419 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-25 16:51:20,420 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-11-25 16:51:20,421 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-11-25 16:51:20,421 INFO L138 SettingsManager]: * Use SBE=true [2022-11-25 16:51:20,422 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-25 16:51:20,423 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-25 16:51:20,424 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-25 16:51:20,424 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-25 16:51:20,424 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-25 16:51:20,425 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-25 16:51:20,425 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-25 16:51:20,425 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-25 16:51:20,426 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-25 16:51:20,426 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-25 16:51:20,426 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-25 16:51:20,427 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-25 16:51:20,427 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-25 16:51:20,428 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-11-25 16:51:20,428 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-25 16:51:20,428 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-25 16:51:20,429 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-25 16:51:20,429 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-25 16:51:20,430 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-25 16:51:20,430 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2022-11-25 16:51:20,431 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-25 16:51:20,431 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2022-11-25 16:51:20,431 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-25 16:51:20,432 INFO L138 SettingsManager]: * Order on configurations for Petri net unfoldings=DBO [2022-11-25 16:51:20,432 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2022-11-25 16:51:20,433 INFO L138 SettingsManager]: * Looper check in Petri net analysis=SEMANTIC 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_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 436f0a1b9da8affd8e76edc25dee0cffff5a08ff489ec96067821d6a4548518b [2022-11-25 16:51:20,820 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-25 16:51:20,861 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-25 16:51:20,868 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-25 16:51:20,870 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-25 16:51:20,871 INFO L275 PluginConnector]: CDTParser initialized [2022-11-25 16:51:20,873 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/../../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_unwindbound50.c [2022-11-25 16:51:24,083 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-25 16:51:24,350 INFO L351 CDTParser]: Found 1 translation units. [2022-11-25 16:51:24,351 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_unwindbound50.c [2022-11-25 16:51:24,358 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/data/e6fcd4219/3cbe1dd759da4bacbbe9eee7e0ca1299/FLAGa2c44d3fa [2022-11-25 16:51:24,375 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/data/e6fcd4219/3cbe1dd759da4bacbbe9eee7e0ca1299 [2022-11-25 16:51:24,378 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-25 16:51:24,380 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-25 16:51:24,382 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-25 16:51:24,382 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-25 16:51:24,386 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-25 16:51:24,387 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 04:51:24" (1/1) ... [2022-11-25 16:51:24,389 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@331d6e33 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 04:51:24, skipping insertion in model container [2022-11-25 16:51:24,389 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 04:51:24" (1/1) ... [2022-11-25 16:51:24,399 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-25 16:51:24,419 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-25 16:51:24,599 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_a32c0683-75fa-4f1e-b98b-18be6323140f/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_unwindbound50.c[490,503] [2022-11-25 16:51:24,643 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-25 16:51:24,656 INFO L203 MainTranslator]: Completed pre-run [2022-11-25 16:51:24,669 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_a32c0683-75fa-4f1e-b98b-18be6323140f/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_unwindbound50.c[490,503] [2022-11-25 16:51:24,681 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-25 16:51:24,699 INFO L208 MainTranslator]: Completed translation [2022-11-25 16:51:24,699 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 04:51:24 WrapperNode [2022-11-25 16:51:24,700 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-25 16:51:24,701 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-25 16:51:24,701 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-25 16:51:24,701 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-25 16:51:24,708 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 04:51:24" (1/1) ... [2022-11-25 16:51:24,717 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 04:51:24" (1/1) ... [2022-11-25 16:51:24,740 INFO L138 Inliner]: procedures = 14, calls = 14, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 91 [2022-11-25 16:51:24,740 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-25 16:51:24,741 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-25 16:51:24,741 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-25 16:51:24,741 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-25 16:51:24,751 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 04:51:24" (1/1) ... [2022-11-25 16:51:24,751 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 04:51:24" (1/1) ... [2022-11-25 16:51:24,753 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 04:51:24" (1/1) ... [2022-11-25 16:51:24,754 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 04:51:24" (1/1) ... [2022-11-25 16:51:24,758 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 04:51:24" (1/1) ... [2022-11-25 16:51:24,763 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 04:51:24" (1/1) ... [2022-11-25 16:51:24,765 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 04:51:24" (1/1) ... [2022-11-25 16:51:24,766 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 04:51:24" (1/1) ... [2022-11-25 16:51:24,768 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-25 16:51:24,770 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-25 16:51:24,770 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-25 16:51:24,770 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-25 16:51:24,771 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 04:51:24" (1/1) ... [2022-11-25 16:51:24,779 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-25 16:51:24,795 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 16:51:24,810 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-25 16:51:24,824 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-25 16:51:24,870 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-25 16:51:24,871 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-11-25 16:51:24,872 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-11-25 16:51:24,872 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-25 16:51:24,872 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-25 16:51:24,872 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-25 16:51:24,878 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-11-25 16:51:24,878 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-11-25 16:51:24,964 INFO L235 CfgBuilder]: Building ICFG [2022-11-25 16:51:24,966 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-25 16:51:25,208 INFO L276 CfgBuilder]: Performing block encoding [2022-11-25 16:51:25,216 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-25 16:51:25,217 INFO L300 CfgBuilder]: Removed 3 assume(true) statements. [2022-11-25 16:51:25,219 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 04:51:25 BoogieIcfgContainer [2022-11-25 16:51:25,219 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-25 16:51:25,223 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-25 16:51:25,223 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-25 16:51:25,228 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-25 16:51:25,228 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 04:51:24" (1/3) ... [2022-11-25 16:51:25,229 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@552d2c46 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 04:51:25, skipping insertion in model container [2022-11-25 16:51:25,229 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 04:51:24" (2/3) ... [2022-11-25 16:51:25,230 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@552d2c46 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 04:51:25, skipping insertion in model container [2022-11-25 16:51:25,230 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 04:51:25" (3/3) ... [2022-11-25 16:51:25,232 INFO L112 eAbstractionObserver]: Analyzing ICFG egcd3-ll_unwindbound50.c [2022-11-25 16:51:25,284 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-25 16:51:25,284 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-25 16:51:25,359 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-25 16:51:25,368 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=PETRI_NET, 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;@2396483c, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-25 16:51:25,368 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-25 16:51:25,373 INFO L276 IsEmpty]: Start isEmpty. Operand has 35 states, 24 states have (on average 1.5) internal successors, (36), 25 states have internal predecessors, (36), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2022-11-25 16:51:25,385 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-11-25 16:51:25,385 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 16:51:25,386 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 16:51:25,387 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 16:51:25,393 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 16:51:25,394 INFO L85 PathProgramCache]: Analyzing trace with hash 1663185933, now seen corresponding path program 1 times [2022-11-25 16:51:25,407 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 16:51:25,407 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [85899865] [2022-11-25 16:51:25,408 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 16:51:25,408 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 16:51:25,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 16:51:25,573 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 16:51:25,574 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [85899865] [2022-11-25 16:51:25,575 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unsupported non-linear arithmetic [2022-11-25 16:51:25,575 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1335453842] [2022-11-25 16:51:25,576 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 16:51:25,576 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 16:51:25,577 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 16:51:25,581 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 16:51:25,583 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-25 16:51:25,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 16:51:25,675 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 1 conjunts are in the unsatisfiable core [2022-11-25 16:51:25,681 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 16:51:25,715 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-25 16:51:25,716 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-25 16:51:25,717 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1335453842] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 16:51:25,717 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 16:51:25,718 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-25 16:51:25,721 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1606096268] [2022-11-25 16:51:25,722 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 16:51:25,728 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-11-25 16:51:25,729 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 16:51:25,768 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-11-25 16:51:25,769 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-25 16:51:25,771 INFO L87 Difference]: Start difference. First operand has 35 states, 24 states have (on average 1.5) internal successors, (36), 25 states have internal predecessors, (36), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) Second operand has 2 states, 2 states have (on average 6.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-25 16:51:25,803 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 16:51:25,804 INFO L93 Difference]: Finished difference Result 67 states and 103 transitions. [2022-11-25 16:51:25,805 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-11-25 16:51:25,806 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 6.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 18 [2022-11-25 16:51:25,806 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 16:51:25,815 INFO L225 Difference]: With dead ends: 67 [2022-11-25 16:51:25,815 INFO L226 Difference]: Without dead ends: 31 [2022-11-25 16:51:25,820 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-25 16:51:25,825 INFO L413 NwaCegarLoop]: 45 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-25 16:51:25,826 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 45 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-25 16:51:25,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2022-11-25 16:51:25,867 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2022-11-25 16:51:25,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 21 states have (on average 1.3333333333333333) internal successors, (28), 22 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) [2022-11-25 16:51:25,871 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 41 transitions. [2022-11-25 16:51:25,872 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 41 transitions. Word has length 18 [2022-11-25 16:51:25,873 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 16:51:25,873 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 41 transitions. [2022-11-25 16:51:25,874 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 6.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-25 16:51:25,874 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 41 transitions. [2022-11-25 16:51:25,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-11-25 16:51:25,876 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 16:51:25,876 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 16:51:25,883 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2022-11-25 16:51:26,083 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2022-11-25 16:51:26,083 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 16:51:26,084 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 16:51:26,085 INFO L85 PathProgramCache]: Analyzing trace with hash 1013747788, now seen corresponding path program 1 times [2022-11-25 16:51:26,085 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 16:51:26,085 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1750524987] [2022-11-25 16:51:26,086 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 16:51:26,086 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 16:51:26,110 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 16:51:26,110 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1155341896] [2022-11-25 16:51:26,110 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 16:51:26,111 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 16:51:26,111 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 16:51:26,112 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 16:51:26,142 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-25 16:51:26,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 16:51:26,245 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-25 16:51:26,247 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 16:51:26,350 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-25 16:51:26,350 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-25 16:51:26,351 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 16:51:26,351 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1750524987] [2022-11-25 16:51:26,351 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 16:51:26,351 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1155341896] [2022-11-25 16:51:26,352 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1155341896] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 16:51:26,352 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 16:51:26,352 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-25 16:51:26,352 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1861534635] [2022-11-25 16:51:26,353 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 16:51:26,353 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-25 16:51:26,354 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 16:51:26,354 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-25 16:51:26,355 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-25 16:51:26,356 INFO L87 Difference]: Start difference. First operand 31 states and 41 transitions. Second operand has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 16:51:26,381 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 16:51:26,381 INFO L93 Difference]: Finished difference Result 40 states and 50 transitions. [2022-11-25 16:51:26,382 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-25 16:51:26,382 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 19 [2022-11-25 16:51:26,383 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 16:51:26,383 INFO L225 Difference]: With dead ends: 40 [2022-11-25 16:51:26,384 INFO L226 Difference]: Without dead ends: 33 [2022-11-25 16:51:26,384 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-25 16:51:26,386 INFO L413 NwaCegarLoop]: 39 mSDtfsCounter, 0 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 103 SdHoareTripleChecker+Invalid, 10 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 10 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-25 16:51:26,386 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 103 Invalid, 10 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 10 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-25 16:51:26,388 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2022-11-25 16:51:26,394 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2022-11-25 16:51:26,394 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 23 states have (on average 1.3043478260869565) internal successors, (30), 24 states have internal predecessors, (30), 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) [2022-11-25 16:51:26,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 43 transitions. [2022-11-25 16:51:26,396 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 43 transitions. Word has length 19 [2022-11-25 16:51:26,398 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 16:51:26,398 INFO L495 AbstractCegarLoop]: Abstraction has 33 states and 43 transitions. [2022-11-25 16:51:26,398 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 16:51:26,398 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 43 transitions. [2022-11-25 16:51:26,399 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-11-25 16:51:26,399 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 16:51:26,400 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 16:51:26,411 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-25 16:51:26,606 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 16:51:26,607 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 16:51:26,607 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 16:51:26,608 INFO L85 PathProgramCache]: Analyzing trace with hash 1341775226, now seen corresponding path program 1 times [2022-11-25 16:51:26,608 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 16:51:26,608 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2086459030] [2022-11-25 16:51:26,608 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 16:51:26,608 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 16:51:26,633 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 16:51:26,633 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [115034969] [2022-11-25 16:51:26,633 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 16:51:26,634 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 16:51:26,634 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 16:51:26,635 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 16:51:26,638 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-25 16:51:26,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 16:51:26,697 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 7 conjunts are in the unsatisfiable core [2022-11-25 16:51:26,699 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 16:51:26,750 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-25 16:51:26,751 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-25 16:51:26,751 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 16:51:26,751 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2086459030] [2022-11-25 16:51:26,752 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 16:51:26,752 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [115034969] [2022-11-25 16:51:26,752 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [115034969] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 16:51:26,752 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 16:51:26,753 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-11-25 16:51:26,753 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [203399114] [2022-11-25 16:51:26,753 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 16:51:26,754 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-25 16:51:26,754 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 16:51:26,755 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-25 16:51:26,755 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-25 16:51:26,755 INFO L87 Difference]: Start difference. First operand 33 states and 43 transitions. Second operand has 6 states, 6 states have (on average 2.5) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 16:51:26,918 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 16:51:26,919 INFO L93 Difference]: Finished difference Result 53 states and 71 transitions. [2022-11-25 16:51:26,919 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-25 16:51:26,920 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 20 [2022-11-25 16:51:26,921 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 16:51:26,927 INFO L225 Difference]: With dead ends: 53 [2022-11-25 16:51:26,927 INFO L226 Difference]: Without dead ends: 46 [2022-11-25 16:51:26,928 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2022-11-25 16:51:26,933 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 47 mSDsluCounter, 91 mSDsCounter, 0 mSdLazyCounter, 60 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 128 SdHoareTripleChecker+Invalid, 68 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 60 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 16:51:26,934 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [51 Valid, 128 Invalid, 68 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 60 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 16:51:26,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2022-11-25 16:51:26,953 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 34. [2022-11-25 16:51:26,954 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 24 states have (on average 1.2916666666666667) internal successors, (31), 25 states have internal predecessors, (31), 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) [2022-11-25 16:51:26,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 44 transitions. [2022-11-25 16:51:26,955 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 44 transitions. Word has length 20 [2022-11-25 16:51:26,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 16:51:26,956 INFO L495 AbstractCegarLoop]: Abstraction has 34 states and 44 transitions. [2022-11-25 16:51:26,956 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 16:51:26,956 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 44 transitions. [2022-11-25 16:51:26,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-11-25 16:51:26,957 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 16:51:26,958 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 16:51:26,967 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-25 16:51:27,158 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 16:51:27,159 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 16:51:27,159 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 16:51:27,159 INFO L85 PathProgramCache]: Analyzing trace with hash -1315139464, now seen corresponding path program 1 times [2022-11-25 16:51:27,160 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 16:51:27,160 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [223441641] [2022-11-25 16:51:27,160 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 16:51:27,173 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 16:51:27,190 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 16:51:27,191 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [290805077] [2022-11-25 16:51:27,191 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 16:51:27,191 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 16:51:27,191 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 16:51:27,193 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 16:51:27,198 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-25 16:51:27,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 16:51:27,274 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 5 conjunts are in the unsatisfiable core [2022-11-25 16:51:27,276 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 16:51:27,336 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-25 16:51:27,336 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-25 16:51:27,337 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 16:51:27,337 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [223441641] [2022-11-25 16:51:27,337 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 16:51:27,338 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [290805077] [2022-11-25 16:51:27,338 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [290805077] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 16:51:27,338 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 16:51:27,338 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-25 16:51:27,339 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1944948112] [2022-11-25 16:51:27,339 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 16:51:27,340 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-25 16:51:27,340 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 16:51:27,341 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-25 16:51:27,341 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-25 16:51:27,342 INFO L87 Difference]: Start difference. First operand 34 states and 44 transitions. Second operand has 5 states, 5 states have (on average 3.4) internal successors, (17), 4 states have internal predecessors, (17), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 16:51:27,370 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 16:51:27,370 INFO L93 Difference]: Finished difference Result 58 states and 78 transitions. [2022-11-25 16:51:27,371 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-25 16:51:27,371 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 4 states have internal predecessors, (17), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 25 [2022-11-25 16:51:27,372 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 16:51:27,372 INFO L225 Difference]: With dead ends: 58 [2022-11-25 16:51:27,373 INFO L226 Difference]: Without dead ends: 36 [2022-11-25 16:51:27,373 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-25 16:51:27,375 INFO L413 NwaCegarLoop]: 38 mSDtfsCounter, 0 mSDsluCounter, 90 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 128 SdHoareTripleChecker+Invalid, 16 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-25 16:51:27,376 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 128 Invalid, 16 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-25 16:51:27,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2022-11-25 16:51:27,383 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2022-11-25 16:51:27,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 26 states have (on average 1.2692307692307692) internal successors, (33), 27 states have internal predecessors, (33), 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) [2022-11-25 16:51:27,385 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 46 transitions. [2022-11-25 16:51:27,385 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 46 transitions. Word has length 25 [2022-11-25 16:51:27,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 16:51:27,386 INFO L495 AbstractCegarLoop]: Abstraction has 36 states and 46 transitions. [2022-11-25 16:51:27,386 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 4 states have internal predecessors, (17), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 16:51:27,387 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 46 transitions. [2022-11-25 16:51:27,387 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-11-25 16:51:27,388 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 16:51:27,388 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 16:51:27,403 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2022-11-25 16:51:27,594 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 16:51:27,595 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 16:51:27,595 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 16:51:27,595 INFO L85 PathProgramCache]: Analyzing trace with hash 570907173, now seen corresponding path program 1 times [2022-11-25 16:51:27,596 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 16:51:27,596 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [868808447] [2022-11-25 16:51:27,596 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 16:51:27,596 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 16:51:27,615 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 16:51:27,616 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2057430989] [2022-11-25 16:51:27,616 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 16:51:27,616 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 16:51:27,617 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 16:51:27,618 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 16:51:27,662 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-25 16:51:27,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 16:51:27,715 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-25 16:51:27,718 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 16:51:28,043 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-25 16:51:28,044 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-25 16:51:28,044 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 16:51:28,045 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [868808447] [2022-11-25 16:51:28,045 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 16:51:28,046 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2057430989] [2022-11-25 16:51:28,046 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2057430989] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 16:51:28,047 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 16:51:28,047 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-11-25 16:51:28,047 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1149595000] [2022-11-25 16:51:28,047 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 16:51:28,048 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-11-25 16:51:28,048 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 16:51:28,049 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-11-25 16:51:28,049 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2022-11-25 16:51:28,050 INFO L87 Difference]: Start difference. First operand 36 states and 46 transitions. Second operand has 9 states, 8 states have (on average 2.5) internal successors, (20), 7 states have internal predecessors, (20), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 16:51:28,204 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 16:51:28,204 INFO L93 Difference]: Finished difference Result 54 states and 71 transitions. [2022-11-25 16:51:28,205 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-25 16:51:28,205 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 2.5) internal successors, (20), 7 states have internal predecessors, (20), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 25 [2022-11-25 16:51:28,206 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 16:51:28,207 INFO L225 Difference]: With dead ends: 54 [2022-11-25 16:51:28,207 INFO L226 Difference]: Without dead ends: 52 [2022-11-25 16:51:28,207 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2022-11-25 16:51:28,209 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 55 mSDsluCounter, 140 mSDsCounter, 0 mSdLazyCounter, 86 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 176 SdHoareTripleChecker+Invalid, 94 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 86 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 16:51:28,209 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [63 Valid, 176 Invalid, 94 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 86 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 16:51:28,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2022-11-25 16:51:28,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2022-11-25 16:51:28,231 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 36 states have (on average 1.3055555555555556) internal successors, (47), 37 states have internal predecessors, (47), 11 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-11-25 16:51:28,232 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 68 transitions. [2022-11-25 16:51:28,232 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 68 transitions. Word has length 25 [2022-11-25 16:51:28,232 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 16:51:28,233 INFO L495 AbstractCegarLoop]: Abstraction has 51 states and 68 transitions. [2022-11-25 16:51:28,233 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 2.5) internal successors, (20), 7 states have internal predecessors, (20), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 16:51:28,233 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 68 transitions. [2022-11-25 16:51:28,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-11-25 16:51:28,234 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 16:51:28,234 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 16:51:28,249 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-25 16:51:28,443 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 16:51:28,444 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 16:51:28,444 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 16:51:28,444 INFO L85 PathProgramCache]: Analyzing trace with hash -1698298847, now seen corresponding path program 1 times [2022-11-25 16:51:28,444 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 16:51:28,445 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [298716579] [2022-11-25 16:51:28,445 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 16:51:28,445 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 16:51:28,462 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 16:51:28,463 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2144037241] [2022-11-25 16:51:28,464 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 16:51:28,465 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 16:51:28,465 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 16:51:28,466 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 16:51:28,486 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-25 16:51:28,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 16:51:28,528 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 7 conjunts are in the unsatisfiable core [2022-11-25 16:51:28,530 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 16:51:28,599 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-25 16:51:28,599 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 16:51:28,707 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-25 16:51:28,708 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 16:51:28,708 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [298716579] [2022-11-25 16:51:28,709 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 16:51:28,710 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2144037241] [2022-11-25 16:51:28,710 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2144037241] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 16:51:28,710 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-25 16:51:28,710 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6] total 10 [2022-11-25 16:51:28,711 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1123154202] [2022-11-25 16:51:28,711 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-25 16:51:28,711 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-11-25 16:51:28,712 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 16:51:28,712 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-11-25 16:51:28,713 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2022-11-25 16:51:28,715 INFO L87 Difference]: Start difference. First operand 51 states and 68 transitions. Second operand has 10 states, 10 states have (on average 3.3) internal successors, (33), 10 states have internal predecessors, (33), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-11-25 16:51:28,955 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 16:51:28,955 INFO L93 Difference]: Finished difference Result 147 states and 193 transitions. [2022-11-25 16:51:28,956 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-25 16:51:28,957 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.3) internal successors, (33), 10 states have internal predecessors, (33), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 26 [2022-11-25 16:51:28,957 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 16:51:28,963 INFO L225 Difference]: With dead ends: 147 [2022-11-25 16:51:28,963 INFO L226 Difference]: Without dead ends: 140 [2022-11-25 16:51:28,964 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=56, Invalid=100, Unknown=0, NotChecked=0, Total=156 [2022-11-25 16:51:28,967 INFO L413 NwaCegarLoop]: 49 mSDtfsCounter, 83 mSDsluCounter, 185 mSDsCounter, 0 mSdLazyCounter, 115 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 83 SdHoareTripleChecker+Valid, 234 SdHoareTripleChecker+Invalid, 135 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 115 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 16:51:28,968 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [83 Valid, 234 Invalid, 135 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 115 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 16:51:28,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2022-11-25 16:51:29,016 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 97. [2022-11-25 16:51:29,017 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 69 states have (on average 1.3333333333333333) internal successors, (92), 71 states have internal predecessors, (92), 20 states have call successors, (20), 7 states have call predecessors, (20), 7 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) [2022-11-25 16:51:29,024 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 130 transitions. [2022-11-25 16:51:29,024 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 130 transitions. Word has length 26 [2022-11-25 16:51:29,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 16:51:29,026 INFO L495 AbstractCegarLoop]: Abstraction has 97 states and 130 transitions. [2022-11-25 16:51:29,026 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 3.3) internal successors, (33), 10 states have internal predecessors, (33), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-11-25 16:51:29,026 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 130 transitions. [2022-11-25 16:51:29,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-11-25 16:51:29,030 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 16:51:29,032 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 16:51:29,042 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-25 16:51:29,233 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-11-25 16:51:29,233 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 16:51:29,234 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 16:51:29,234 INFO L85 PathProgramCache]: Analyzing trace with hash -1127291835, now seen corresponding path program 1 times [2022-11-25 16:51:29,234 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 16:51:29,234 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1254875581] [2022-11-25 16:51:29,234 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 16:51:29,235 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 16:51:29,248 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 16:51:29,248 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1500944321] [2022-11-25 16:51:29,248 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 16:51:29,248 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 16:51:29,249 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 16:51:29,250 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 16:51:29,270 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-25 16:51:29,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 16:51:29,342 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-25 16:51:29,344 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 16:51:29,488 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-25 16:51:29,489 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 16:51:29,617 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-25 16:51:29,617 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 16:51:29,618 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1254875581] [2022-11-25 16:51:29,618 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 16:51:29,618 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1500944321] [2022-11-25 16:51:29,618 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1500944321] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 16:51:29,619 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-25 16:51:29,619 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2022-11-25 16:51:29,619 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1201626237] [2022-11-25 16:51:29,619 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-25 16:51:29,620 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-11-25 16:51:29,620 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 16:51:29,620 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-11-25 16:51:29,621 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2022-11-25 16:51:29,623 INFO L87 Difference]: Start difference. First operand 97 states and 130 transitions. Second operand has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-25 16:51:29,973 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 16:51:29,973 INFO L93 Difference]: Finished difference Result 183 states and 261 transitions. [2022-11-25 16:51:29,974 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-25 16:51:29,974 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 27 [2022-11-25 16:51:29,975 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 16:51:29,977 INFO L225 Difference]: With dead ends: 183 [2022-11-25 16:51:29,977 INFO L226 Difference]: Without dead ends: 171 [2022-11-25 16:51:29,978 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 41 SyntacticMatches, 4 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=60, Invalid=180, Unknown=0, NotChecked=0, Total=240 [2022-11-25 16:51:29,979 INFO L413 NwaCegarLoop]: 61 mSDtfsCounter, 122 mSDsluCounter, 264 mSDsCounter, 0 mSdLazyCounter, 183 mSolverCounterSat, 54 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 126 SdHoareTripleChecker+Valid, 325 SdHoareTripleChecker+Invalid, 237 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 54 IncrementalHoareTripleChecker+Valid, 183 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-25 16:51:29,979 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [126 Valid, 325 Invalid, 237 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [54 Valid, 183 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-25 16:51:29,980 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 171 states. [2022-11-25 16:51:30,006 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 171 to 128. [2022-11-25 16:51:30,007 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128 states, 97 states have (on average 1.3505154639175259) internal successors, (131), 98 states have internal predecessors, (131), 23 states have call successors, (23), 7 states have call predecessors, (23), 7 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2022-11-25 16:51:30,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 176 transitions. [2022-11-25 16:51:30,009 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 176 transitions. Word has length 27 [2022-11-25 16:51:30,009 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 16:51:30,010 INFO L495 AbstractCegarLoop]: Abstraction has 128 states and 176 transitions. [2022-11-25 16:51:30,010 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-25 16:51:30,010 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 176 transitions. [2022-11-25 16:51:30,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-11-25 16:51:30,011 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 16:51:30,012 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 16:51:30,026 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-25 16:51:30,219 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2022-11-25 16:51:30,219 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 16:51:30,220 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 16:51:30,220 INFO L85 PathProgramCache]: Analyzing trace with hash -200071253, now seen corresponding path program 1 times [2022-11-25 16:51:30,220 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 16:51:30,220 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [745564583] [2022-11-25 16:51:30,220 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 16:51:30,220 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 16:51:30,237 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 16:51:30,237 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [627343232] [2022-11-25 16:51:30,237 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 16:51:30,238 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 16:51:30,238 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 16:51:30,239 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 16:51:30,258 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-25 16:51:30,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 16:51:30,311 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 17 conjunts are in the unsatisfiable core [2022-11-25 16:51:30,315 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 16:51:30,468 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-25 16:51:30,468 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 16:51:30,620 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 16:51:30,620 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [745564583] [2022-11-25 16:51:30,621 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 16:51:30,621 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [627343232] [2022-11-25 16:51:30,621 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [627343232] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 16:51:30,621 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-25 16:51:30,621 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2022-11-25 16:51:30,622 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [493342789] [2022-11-25 16:51:30,622 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-25 16:51:30,622 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-25 16:51:30,623 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 16:51:30,623 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-25 16:51:30,624 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2022-11-25 16:51:30,624 INFO L87 Difference]: Start difference. First operand 128 states and 176 transitions. Second operand has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-11-25 16:51:30,791 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 16:51:30,791 INFO L93 Difference]: Finished difference Result 143 states and 190 transitions. [2022-11-25 16:51:30,792 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-25 16:51:30,792 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 30 [2022-11-25 16:51:30,793 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 16:51:30,795 INFO L225 Difference]: With dead ends: 143 [2022-11-25 16:51:30,796 INFO L226 Difference]: Without dead ends: 141 [2022-11-25 16:51:30,796 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2022-11-25 16:51:30,798 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 15 mSDsluCounter, 121 mSDsCounter, 0 mSdLazyCounter, 111 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 153 SdHoareTripleChecker+Invalid, 111 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 111 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 16:51:30,799 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 153 Invalid, 111 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 111 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 16:51:30,800 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2022-11-25 16:51:30,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 140. [2022-11-25 16:51:30,843 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 140 states, 106 states have (on average 1.320754716981132) internal successors, (140), 107 states have internal predecessors, (140), 23 states have call successors, (23), 10 states have call predecessors, (23), 10 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2022-11-25 16:51:30,845 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 185 transitions. [2022-11-25 16:51:30,845 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 185 transitions. Word has length 30 [2022-11-25 16:51:30,845 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 16:51:30,846 INFO L495 AbstractCegarLoop]: Abstraction has 140 states and 185 transitions. [2022-11-25 16:51:30,846 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-11-25 16:51:30,846 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 185 transitions. [2022-11-25 16:51:30,847 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-11-25 16:51:30,847 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 16:51:30,848 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 16:51:30,860 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-25 16:51:31,055 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 16:51:31,055 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 16:51:31,056 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 16:51:31,056 INFO L85 PathProgramCache]: Analyzing trace with hash 164485690, now seen corresponding path program 1 times [2022-11-25 16:51:31,056 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 16:51:31,056 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [807924916] [2022-11-25 16:51:31,057 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 16:51:31,057 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 16:51:31,088 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 16:51:31,088 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2036046564] [2022-11-25 16:51:31,088 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 16:51:31,088 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 16:51:31,088 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 16:51:31,097 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 16:51:31,114 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-25 16:51:31,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 16:51:31,165 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 29 conjunts are in the unsatisfiable core [2022-11-25 16:51:31,167 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 16:51:31,511 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-25 16:51:31,514 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 16:51:31,660 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-25 16:51:31,661 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 16:51:31,661 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [807924916] [2022-11-25 16:51:31,661 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 16:51:31,661 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2036046564] [2022-11-25 16:51:31,662 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2036046564] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 16:51:31,662 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-25 16:51:31,662 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 6] total 14 [2022-11-25 16:51:31,664 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1412977116] [2022-11-25 16:51:31,665 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-25 16:51:31,667 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-25 16:51:31,668 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 16:51:31,668 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-25 16:51:31,669 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=149, Unknown=0, NotChecked=0, Total=182 [2022-11-25 16:51:31,669 INFO L87 Difference]: Start difference. First operand 140 states and 185 transitions. Second operand has 14 states, 14 states have (on average 3.2142857142857144) internal successors, (45), 11 states have internal predecessors, (45), 4 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-11-25 16:51:32,076 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 16:51:32,076 INFO L93 Difference]: Finished difference Result 183 states and 251 transitions. [2022-11-25 16:51:32,077 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-25 16:51:32,077 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.2142857142857144) internal successors, (45), 11 states have internal predecessors, (45), 4 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 32 [2022-11-25 16:51:32,078 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 16:51:32,079 INFO L225 Difference]: With dead ends: 183 [2022-11-25 16:51:32,079 INFO L226 Difference]: Without dead ends: 181 [2022-11-25 16:51:32,080 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2022-11-25 16:51:32,080 INFO L413 NwaCegarLoop]: 53 mSDtfsCounter, 108 mSDsluCounter, 290 mSDsCounter, 0 mSdLazyCounter, 272 mSolverCounterSat, 43 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 116 SdHoareTripleChecker+Valid, 343 SdHoareTripleChecker+Invalid, 315 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 43 IncrementalHoareTripleChecker+Valid, 272 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-25 16:51:32,081 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [116 Valid, 343 Invalid, 315 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [43 Valid, 272 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-25 16:51:32,082 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 181 states. [2022-11-25 16:51:32,116 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 181 to 170. [2022-11-25 16:51:32,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 170 states, 127 states have (on average 1.3464566929133859) internal successors, (171), 128 states have internal predecessors, (171), 31 states have call successors, (31), 11 states have call predecessors, (31), 11 states have return successors, (30), 30 states have call predecessors, (30), 30 states have call successors, (30) [2022-11-25 16:51:32,118 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 170 states to 170 states and 232 transitions. [2022-11-25 16:51:32,118 INFO L78 Accepts]: Start accepts. Automaton has 170 states and 232 transitions. Word has length 32 [2022-11-25 16:51:32,119 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 16:51:32,120 INFO L495 AbstractCegarLoop]: Abstraction has 170 states and 232 transitions. [2022-11-25 16:51:32,120 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 3.2142857142857144) internal successors, (45), 11 states have internal predecessors, (45), 4 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-11-25 16:51:32,120 INFO L276 IsEmpty]: Start isEmpty. Operand 170 states and 232 transitions. [2022-11-25 16:51:32,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-11-25 16:51:32,124 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 16:51:32,124 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 16:51:32,135 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-25 16:51:32,330 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 16:51:32,330 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 16:51:32,330 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 16:51:32,330 INFO L85 PathProgramCache]: Analyzing trace with hash 1985711111, now seen corresponding path program 1 times [2022-11-25 16:51:32,330 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 16:51:32,331 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1298861062] [2022-11-25 16:51:32,331 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 16:51:32,331 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 16:51:32,345 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 16:51:32,345 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1156587287] [2022-11-25 16:51:32,345 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 16:51:32,345 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 16:51:32,345 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 16:51:32,346 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 16:51:32,361 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-25 16:51:32,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 16:51:32,412 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 7 conjunts are in the unsatisfiable core [2022-11-25 16:51:32,414 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 16:51:32,483 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-25 16:51:32,483 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-25 16:51:32,484 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 16:51:32,484 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1298861062] [2022-11-25 16:51:32,484 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 16:51:32,484 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1156587287] [2022-11-25 16:51:32,484 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1156587287] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 16:51:32,485 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 16:51:32,485 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-25 16:51:32,486 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [842728316] [2022-11-25 16:51:32,486 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 16:51:32,487 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-25 16:51:32,487 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 16:51:32,488 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-25 16:51:32,488 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2022-11-25 16:51:32,488 INFO L87 Difference]: Start difference. First operand 170 states and 232 transitions. Second operand has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 16:51:32,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 16:51:32,542 INFO L93 Difference]: Finished difference Result 237 states and 325 transitions. [2022-11-25 16:51:32,543 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-25 16:51:32,543 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 32 [2022-11-25 16:51:32,547 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 16:51:32,550 INFO L225 Difference]: With dead ends: 237 [2022-11-25 16:51:32,550 INFO L226 Difference]: Without dead ends: 170 [2022-11-25 16:51:32,555 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2022-11-25 16:51:32,556 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 2 mSDsluCounter, 91 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 128 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-25 16:51:32,557 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 128 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-25 16:51:32,558 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2022-11-25 16:51:32,590 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 170. [2022-11-25 16:51:32,591 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 170 states, 127 states have (on average 1.3385826771653544) internal successors, (170), 128 states have internal predecessors, (170), 31 states have call successors, (31), 11 states have call predecessors, (31), 11 states have return successors, (30), 30 states have call predecessors, (30), 30 states have call successors, (30) [2022-11-25 16:51:32,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 170 states to 170 states and 231 transitions. [2022-11-25 16:51:32,594 INFO L78 Accepts]: Start accepts. Automaton has 170 states and 231 transitions. Word has length 32 [2022-11-25 16:51:32,594 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 16:51:32,594 INFO L495 AbstractCegarLoop]: Abstraction has 170 states and 231 transitions. [2022-11-25 16:51:32,595 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 16:51:32,595 INFO L276 IsEmpty]: Start isEmpty. Operand 170 states and 231 transitions. [2022-11-25 16:51:32,599 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-11-25 16:51:32,599 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 16:51:32,599 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 16:51:32,612 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-25 16:51:32,812 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-25 16:51:32,813 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 16:51:32,814 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 16:51:32,814 INFO L85 PathProgramCache]: Analyzing trace with hash 1730540965, now seen corresponding path program 1 times [2022-11-25 16:51:32,814 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 16:51:32,815 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [608180160] [2022-11-25 16:51:32,815 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 16:51:32,815 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 16:51:32,840 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 16:51:32,841 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1029688593] [2022-11-25 16:51:32,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 16:51:32,841 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 16:51:32,841 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 16:51:32,842 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 16:51:32,862 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-25 16:51:32,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 16:51:32,913 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 15 conjunts are in the unsatisfiable core [2022-11-25 16:51:32,915 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 16:51:33,039 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-11-25 16:51:33,039 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 16:51:33,191 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-11-25 16:51:33,192 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 16:51:33,192 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [608180160] [2022-11-25 16:51:33,192 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 16:51:33,192 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1029688593] [2022-11-25 16:51:33,193 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1029688593] provided 1 perfect and 1 imperfect interpolant sequences [2022-11-25 16:51:33,193 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-25 16:51:33,193 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [7] total 9 [2022-11-25 16:51:33,193 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1163448149] [2022-11-25 16:51:33,193 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 16:51:33,194 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-25 16:51:33,194 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 16:51:33,195 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-25 16:51:33,195 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2022-11-25 16:51:33,195 INFO L87 Difference]: Start difference. First operand 170 states and 231 transitions. Second operand has 6 states, 5 states have (on average 4.0) internal successors, (20), 4 states have internal predecessors, (20), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2022-11-25 16:51:33,317 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 16:51:33,317 INFO L93 Difference]: Finished difference Result 235 states and 331 transitions. [2022-11-25 16:51:33,317 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-25 16:51:33,318 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 4.0) internal successors, (20), 4 states have internal predecessors, (20), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) Word has length 35 [2022-11-25 16:51:33,319 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 16:51:33,321 INFO L225 Difference]: With dead ends: 235 [2022-11-25 16:51:33,321 INFO L226 Difference]: Without dead ends: 233 [2022-11-25 16:51:33,321 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 59 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2022-11-25 16:51:33,322 INFO L413 NwaCegarLoop]: 39 mSDtfsCounter, 9 mSDsluCounter, 121 mSDsCounter, 0 mSdLazyCounter, 62 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 160 SdHoareTripleChecker+Invalid, 63 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 62 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 16:51:33,323 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 160 Invalid, 63 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 62 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 16:51:33,324 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 233 states. [2022-11-25 16:51:33,367 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 233 to 226. [2022-11-25 16:51:33,368 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 226 states, 160 states have (on average 1.36875) internal successors, (219), 161 states have internal predecessors, (219), 51 states have call successors, (51), 14 states have call predecessors, (51), 14 states have return successors, (50), 50 states have call predecessors, (50), 50 states have call successors, (50) [2022-11-25 16:51:33,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 320 transitions. [2022-11-25 16:51:33,370 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 320 transitions. Word has length 35 [2022-11-25 16:51:33,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 16:51:33,371 INFO L495 AbstractCegarLoop]: Abstraction has 226 states and 320 transitions. [2022-11-25 16:51:33,371 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 4.0) internal successors, (20), 4 states have internal predecessors, (20), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2022-11-25 16:51:33,371 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 320 transitions. [2022-11-25 16:51:33,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-11-25 16:51:33,372 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 16:51:33,372 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 16:51:33,379 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-25 16:51:33,579 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 16:51:33,579 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 16:51:33,580 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 16:51:33,580 INFO L85 PathProgramCache]: Analyzing trace with hash -2009961290, now seen corresponding path program 1 times [2022-11-25 16:51:33,580 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 16:51:33,580 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1954078439] [2022-11-25 16:51:33,580 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 16:51:33,580 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 16:51:33,592 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 16:51:33,593 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1677232773] [2022-11-25 16:51:33,593 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 16:51:33,593 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 16:51:33,593 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 16:51:33,594 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 16:51:33,629 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-25 16:51:33,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 16:51:33,683 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 41 conjunts are in the unsatisfiable core [2022-11-25 16:51:33,686 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 16:51:34,325 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 1 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-25 16:51:34,325 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 16:51:34,757 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-25 16:51:34,757 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 16:51:34,757 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1954078439] [2022-11-25 16:51:34,757 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 16:51:34,757 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1677232773] [2022-11-25 16:51:34,757 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1677232773] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 16:51:34,758 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-25 16:51:34,758 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 9] total 20 [2022-11-25 16:51:34,758 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [584546113] [2022-11-25 16:51:34,758 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-25 16:51:34,759 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-25 16:51:34,759 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 16:51:34,760 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-25 16:51:34,760 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=323, Unknown=0, NotChecked=0, Total=380 [2022-11-25 16:51:34,761 INFO L87 Difference]: Start difference. First operand 226 states and 320 transitions. Second operand has 20 states, 19 states have (on average 2.736842105263158) internal successors, (52), 18 states have internal predecessors, (52), 5 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) [2022-11-25 16:51:46,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 16:51:46,587 INFO L93 Difference]: Finished difference Result 370 states and 531 transitions. [2022-11-25 16:51:46,590 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-11-25 16:51:46,591 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 2.736842105263158) internal successors, (52), 18 states have internal predecessors, (52), 5 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) Word has length 37 [2022-11-25 16:51:46,591 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 16:51:46,594 INFO L225 Difference]: With dead ends: 370 [2022-11-25 16:51:46,595 INFO L226 Difference]: Without dead ends: 368 [2022-11-25 16:51:46,596 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 329 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=317, Invalid=1323, Unknown=0, NotChecked=0, Total=1640 [2022-11-25 16:51:46,596 INFO L413 NwaCegarLoop]: 40 mSDtfsCounter, 208 mSDsluCounter, 309 mSDsCounter, 0 mSdLazyCounter, 700 mSolverCounterSat, 122 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 208 SdHoareTripleChecker+Valid, 349 SdHoareTripleChecker+Invalid, 822 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 122 IncrementalHoareTripleChecker+Valid, 700 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.7s IncrementalHoareTripleChecker+Time [2022-11-25 16:51:46,597 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [208 Valid, 349 Invalid, 822 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [122 Valid, 700 Invalid, 0 Unknown, 0 Unchecked, 4.7s Time] [2022-11-25 16:51:46,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 368 states. [2022-11-25 16:51:46,693 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 368 to 315. [2022-11-25 16:51:46,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 315 states, 235 states have (on average 1.3914893617021276) internal successors, (327), 242 states have internal predecessors, (327), 63 states have call successors, (63), 16 states have call predecessors, (63), 16 states have return successors, (62), 56 states have call predecessors, (62), 62 states have call successors, (62) [2022-11-25 16:51:46,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 315 states to 315 states and 452 transitions. [2022-11-25 16:51:46,697 INFO L78 Accepts]: Start accepts. Automaton has 315 states and 452 transitions. Word has length 37 [2022-11-25 16:51:46,697 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 16:51:46,697 INFO L495 AbstractCegarLoop]: Abstraction has 315 states and 452 transitions. [2022-11-25 16:51:46,697 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 2.736842105263158) internal successors, (52), 18 states have internal predecessors, (52), 5 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) [2022-11-25 16:51:46,698 INFO L276 IsEmpty]: Start isEmpty. Operand 315 states and 452 transitions. [2022-11-25 16:51:46,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-11-25 16:51:46,698 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 16:51:46,699 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 16:51:46,705 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-25 16:51:46,904 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-11-25 16:51:46,905 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 16:51:46,905 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 16:51:46,905 INFO L85 PathProgramCache]: Analyzing trace with hash -1954288725, now seen corresponding path program 1 times [2022-11-25 16:51:46,905 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 16:51:46,906 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [423756630] [2022-11-25 16:51:46,906 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 16:51:46,906 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 16:51:46,934 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 16:51:46,958 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1268725941] [2022-11-25 16:51:46,959 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 16:51:46,959 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 16:51:46,959 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 16:51:47,025 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 16:51:47,087 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-25 16:51:47,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 16:51:47,156 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 15 conjunts are in the unsatisfiable core [2022-11-25 16:51:47,158 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 16:51:47,278 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 8 proven. 4 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-25 16:51:47,278 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 16:51:47,510 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-25 16:51:47,511 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 16:51:47,511 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [423756630] [2022-11-25 16:51:47,511 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 16:51:47,512 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1268725941] [2022-11-25 16:51:47,512 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1268725941] provided 1 perfect and 1 imperfect interpolant sequences [2022-11-25 16:51:47,512 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-25 16:51:47,512 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [7] total 9 [2022-11-25 16:51:47,512 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1208090887] [2022-11-25 16:51:47,513 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 16:51:47,513 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-25 16:51:47,513 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 16:51:47,514 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-25 16:51:47,514 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2022-11-25 16:51:47,514 INFO L87 Difference]: Start difference. First operand 315 states and 452 transitions. Second operand has 5 states, 5 states have (on average 4.0) internal successors, (20), 4 states have internal predecessors, (20), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-11-25 16:51:47,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 16:51:47,711 INFO L93 Difference]: Finished difference Result 324 states and 460 transitions. [2022-11-25 16:51:47,711 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-25 16:51:47,711 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.0) internal successors, (20), 4 states have internal predecessors, (20), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 40 [2022-11-25 16:51:47,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 16:51:47,714 INFO L225 Difference]: With dead ends: 324 [2022-11-25 16:51:47,714 INFO L226 Difference]: Without dead ends: 322 [2022-11-25 16:51:47,715 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 69 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2022-11-25 16:51:47,716 INFO L413 NwaCegarLoop]: 41 mSDtfsCounter, 11 mSDsluCounter, 89 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 130 SdHoareTripleChecker+Invalid, 47 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 16:51:47,716 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 130 Invalid, 47 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 45 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 16:51:47,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 322 states. [2022-11-25 16:51:47,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 322 to 319. [2022-11-25 16:51:47,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 319 states, 238 states have (on average 1.3781512605042017) internal successors, (328), 245 states have internal predecessors, (328), 63 states have call successors, (63), 17 states have call predecessors, (63), 17 states have return successors, (62), 56 states have call predecessors, (62), 62 states have call successors, (62) [2022-11-25 16:51:47,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 319 states to 319 states and 453 transitions. [2022-11-25 16:51:47,826 INFO L78 Accepts]: Start accepts. Automaton has 319 states and 453 transitions. Word has length 40 [2022-11-25 16:51:47,826 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 16:51:47,827 INFO L495 AbstractCegarLoop]: Abstraction has 319 states and 453 transitions. [2022-11-25 16:51:47,827 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.0) internal successors, (20), 4 states have internal predecessors, (20), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-11-25 16:51:47,827 INFO L276 IsEmpty]: Start isEmpty. Operand 319 states and 453 transitions. [2022-11-25 16:51:47,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-11-25 16:51:47,828 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 16:51:47,828 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 16:51:47,837 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-11-25 16:51:48,035 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-11-25 16:51:48,035 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 16:51:48,035 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 16:51:48,036 INFO L85 PathProgramCache]: Analyzing trace with hash -1977082887, now seen corresponding path program 1 times [2022-11-25 16:51:48,036 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 16:51:48,036 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1947839841] [2022-11-25 16:51:48,036 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 16:51:48,036 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 16:51:48,047 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 16:51:48,047 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [968609037] [2022-11-25 16:51:48,047 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 16:51:48,047 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 16:51:48,047 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 16:51:48,056 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 16:51:48,076 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-25 16:51:48,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 16:51:48,132 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-25 16:51:48,133 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 16:51:48,199 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 16 proven. 5 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-25 16:51:48,199 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 16:51:48,286 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 16 proven. 5 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-25 16:51:48,287 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 16:51:48,287 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1947839841] [2022-11-25 16:51:48,287 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 16:51:48,287 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [968609037] [2022-11-25 16:51:48,288 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [968609037] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 16:51:48,288 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-25 16:51:48,288 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 12 [2022-11-25 16:51:48,288 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [381056378] [2022-11-25 16:51:48,289 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-25 16:51:48,289 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-11-25 16:51:48,289 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 16:51:48,290 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-11-25 16:51:48,290 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=82, Unknown=0, NotChecked=0, Total=132 [2022-11-25 16:51:48,291 INFO L87 Difference]: Start difference. First operand 319 states and 453 transitions. Second operand has 12 states, 12 states have (on average 3.8333333333333335) internal successors, (46), 12 states have internal predecessors, (46), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-11-25 16:51:48,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 16:51:48,771 INFO L93 Difference]: Finished difference Result 781 states and 1094 transitions. [2022-11-25 16:51:48,771 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-25 16:51:48,772 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.8333333333333335) internal successors, (46), 12 states have internal predecessors, (46), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 38 [2022-11-25 16:51:48,772 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 16:51:48,775 INFO L225 Difference]: With dead ends: 781 [2022-11-25 16:51:48,775 INFO L226 Difference]: Without dead ends: 592 [2022-11-25 16:51:48,776 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=93, Invalid=179, Unknown=0, NotChecked=0, Total=272 [2022-11-25 16:51:48,777 INFO L413 NwaCegarLoop]: 63 mSDtfsCounter, 134 mSDsluCounter, 268 mSDsCounter, 0 mSdLazyCounter, 136 mSolverCounterSat, 44 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 134 SdHoareTripleChecker+Valid, 331 SdHoareTripleChecker+Invalid, 180 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 44 IncrementalHoareTripleChecker+Valid, 136 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-25 16:51:48,778 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [134 Valid, 331 Invalid, 180 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [44 Valid, 136 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-25 16:51:48,779 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 592 states. [2022-11-25 16:51:48,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 592 to 562. [2022-11-25 16:51:48,921 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 562 states, 406 states have (on average 1.3177339901477831) internal successors, (535), 416 states have internal predecessors, (535), 114 states have call successors, (114), 41 states have call predecessors, (114), 41 states have return successors, (110), 104 states have call predecessors, (110), 110 states have call successors, (110) [2022-11-25 16:51:48,925 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 562 states to 562 states and 759 transitions. [2022-11-25 16:51:48,925 INFO L78 Accepts]: Start accepts. Automaton has 562 states and 759 transitions. Word has length 38 [2022-11-25 16:51:48,926 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 16:51:48,926 INFO L495 AbstractCegarLoop]: Abstraction has 562 states and 759 transitions. [2022-11-25 16:51:48,927 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 3.8333333333333335) internal successors, (46), 12 states have internal predecessors, (46), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-11-25 16:51:48,927 INFO L276 IsEmpty]: Start isEmpty. Operand 562 states and 759 transitions. [2022-11-25 16:51:48,928 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-11-25 16:51:48,928 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 16:51:48,928 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 16:51:48,935 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-11-25 16:51:49,134 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-11-25 16:51:49,135 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 16:51:49,135 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 16:51:49,135 INFO L85 PathProgramCache]: Analyzing trace with hash 321915013, now seen corresponding path program 2 times [2022-11-25 16:51:49,135 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 16:51:49,135 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1302072292] [2022-11-25 16:51:49,136 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 16:51:49,136 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 16:51:49,156 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 16:51:49,165 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [306083963] [2022-11-25 16:51:49,165 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-25 16:51:49,165 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 16:51:49,166 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 16:51:49,171 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 16:51:49,197 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-25 16:51:49,253 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-25 16:51:49,254 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 16:51:49,255 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 5 conjunts are in the unsatisfiable core [2022-11-25 16:51:49,257 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 16:51:49,292 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 19 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-25 16:51:49,292 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-25 16:51:49,293 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 16:51:49,293 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1302072292] [2022-11-25 16:51:49,293 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 16:51:49,293 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [306083963] [2022-11-25 16:51:49,293 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [306083963] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 16:51:49,294 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 16:51:49,294 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-25 16:51:49,294 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1694669146] [2022-11-25 16:51:49,294 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 16:51:49,295 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-25 16:51:49,295 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 16:51:49,296 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-25 16:51:49,296 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-25 16:51:49,296 INFO L87 Difference]: Start difference. First operand 562 states and 759 transitions. Second operand has 5 states, 5 states have (on average 6.2) internal successors, (31), 5 states have internal predecessors, (31), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 16:51:49,654 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 16:51:49,654 INFO L93 Difference]: Finished difference Result 874 states and 1229 transitions. [2022-11-25 16:51:49,655 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-25 16:51:49,655 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 6.2) internal successors, (31), 5 states have internal predecessors, (31), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 39 [2022-11-25 16:51:49,655 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 16:51:49,659 INFO L225 Difference]: With dead ends: 874 [2022-11-25 16:51:49,659 INFO L226 Difference]: Without dead ends: 679 [2022-11-25 16:51:49,660 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2022-11-25 16:51:49,661 INFO L413 NwaCegarLoop]: 57 mSDtfsCounter, 30 mSDsluCounter, 96 mSDsCounter, 0 mSdLazyCounter, 86 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 153 SdHoareTripleChecker+Invalid, 94 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 86 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 16:51:49,661 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 153 Invalid, 94 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 86 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 16:51:49,663 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 679 states. [2022-11-25 16:51:49,809 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 679 to 553. [2022-11-25 16:51:49,811 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 553 states, 401 states have (on average 1.3167082294264338) internal successors, (528), 411 states have internal predecessors, (528), 110 states have call successors, (110), 41 states have call predecessors, (110), 41 states have return successors, (106), 100 states have call predecessors, (106), 106 states have call successors, (106) [2022-11-25 16:51:49,814 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 553 states to 553 states and 744 transitions. [2022-11-25 16:51:49,815 INFO L78 Accepts]: Start accepts. Automaton has 553 states and 744 transitions. Word has length 39 [2022-11-25 16:51:49,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 16:51:49,815 INFO L495 AbstractCegarLoop]: Abstraction has 553 states and 744 transitions. [2022-11-25 16:51:49,816 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 6.2) internal successors, (31), 5 states have internal predecessors, (31), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 16:51:49,816 INFO L276 IsEmpty]: Start isEmpty. Operand 553 states and 744 transitions. [2022-11-25 16:51:49,816 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-11-25 16:51:49,817 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 16:51:49,819 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 16:51:49,826 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-11-25 16:51:50,025 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-11-25 16:51:50,025 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 16:51:50,026 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 16:51:50,026 INFO L85 PathProgramCache]: Analyzing trace with hash -1715872859, now seen corresponding path program 1 times [2022-11-25 16:51:50,026 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 16:51:50,026 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1331128779] [2022-11-25 16:51:50,026 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 16:51:50,027 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 16:51:50,036 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 16:51:50,036 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [646592844] [2022-11-25 16:51:50,037 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 16:51:50,037 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 16:51:50,037 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 16:51:50,038 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 16:51:50,049 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-25 16:51:50,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 16:51:50,110 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-25 16:51:50,112 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 16:51:50,197 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 11 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-25 16:51:50,198 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 16:51:50,311 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 11 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-25 16:51:50,312 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 16:51:50,312 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1331128779] [2022-11-25 16:51:50,312 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 16:51:50,312 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [646592844] [2022-11-25 16:51:50,312 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [646592844] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 16:51:50,312 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-25 16:51:50,313 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8] total 14 [2022-11-25 16:51:50,313 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1604414233] [2022-11-25 16:51:50,313 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-25 16:51:50,314 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-25 16:51:50,314 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 16:51:50,315 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-25 16:51:50,315 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=111, Unknown=0, NotChecked=0, Total=182 [2022-11-25 16:51:50,315 INFO L87 Difference]: Start difference. First operand 553 states and 744 transitions. Second operand has 14 states, 14 states have (on average 3.7142857142857144) internal successors, (52), 14 states have internal predecessors, (52), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-11-25 16:51:50,944 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 16:51:50,944 INFO L93 Difference]: Finished difference Result 1157 states and 1577 transitions. [2022-11-25 16:51:50,944 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-11-25 16:51:50,945 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.7142857142857144) internal successors, (52), 14 states have internal predecessors, (52), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 39 [2022-11-25 16:51:50,945 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 16:51:50,949 INFO L225 Difference]: With dead ends: 1157 [2022-11-25 16:51:50,950 INFO L226 Difference]: Without dead ends: 817 [2022-11-25 16:51:50,951 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=144, Invalid=276, Unknown=0, NotChecked=0, Total=420 [2022-11-25 16:51:50,952 INFO L413 NwaCegarLoop]: 65 mSDtfsCounter, 185 mSDsluCounter, 312 mSDsCounter, 0 mSdLazyCounter, 168 mSolverCounterSat, 54 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 185 SdHoareTripleChecker+Valid, 377 SdHoareTripleChecker+Invalid, 222 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 54 IncrementalHoareTripleChecker+Valid, 168 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-25 16:51:50,952 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [185 Valid, 377 Invalid, 222 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [54 Valid, 168 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-25 16:51:50,954 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 817 states. [2022-11-25 16:51:51,175 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 817 to 780. [2022-11-25 16:51:51,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 780 states, 558 states have (on average 1.2724014336917562) internal successors, (710), 572 states have internal predecessors, (710), 164 states have call successors, (164), 57 states have call predecessors, (164), 57 states have return successors, (158), 150 states have call predecessors, (158), 158 states have call successors, (158) [2022-11-25 16:51:51,181 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 780 states to 780 states and 1032 transitions. [2022-11-25 16:51:51,182 INFO L78 Accepts]: Start accepts. Automaton has 780 states and 1032 transitions. Word has length 39 [2022-11-25 16:51:51,182 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 16:51:51,182 INFO L495 AbstractCegarLoop]: Abstraction has 780 states and 1032 transitions. [2022-11-25 16:51:51,182 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 3.7142857142857144) internal successors, (52), 14 states have internal predecessors, (52), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-11-25 16:51:51,182 INFO L276 IsEmpty]: Start isEmpty. Operand 780 states and 1032 transitions. [2022-11-25 16:51:51,183 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2022-11-25 16:51:51,183 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 16:51:51,183 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 16:51:51,194 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2022-11-25 16:51:51,389 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 16:51:51,389 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 16:51:51,389 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 16:51:51,389 INFO L85 PathProgramCache]: Analyzing trace with hash 753696694, now seen corresponding path program 1 times [2022-11-25 16:51:51,389 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 16:51:51,390 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [7545457] [2022-11-25 16:51:51,390 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 16:51:51,390 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 16:51:51,398 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 16:51:51,398 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [193395450] [2022-11-25 16:51:51,406 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 16:51:51,407 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 16:51:51,407 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 16:51:51,408 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 16:51:51,418 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-11-25 16:51:51,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 16:51:51,471 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 58 conjunts are in the unsatisfiable core [2022-11-25 16:51:51,474 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 16:51:52,515 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 10 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-25 16:51:52,515 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 16:51:54,049 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 10 proven. 13 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2022-11-25 16:51:54,049 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 16:51:54,050 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [7545457] [2022-11-25 16:51:54,050 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 16:51:54,050 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [193395450] [2022-11-25 16:51:54,050 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [193395450] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 16:51:54,050 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-25 16:51:54,050 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 13] total 26 [2022-11-25 16:51:54,050 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1089660205] [2022-11-25 16:51:54,050 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-25 16:51:54,051 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-25 16:51:54,051 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 16:51:54,051 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-25 16:51:54,052 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=558, Unknown=0, NotChecked=0, Total=650 [2022-11-25 16:51:54,052 INFO L87 Difference]: Start difference. First operand 780 states and 1032 transitions. Second operand has 26 states, 24 states have (on average 2.375) internal successors, (57), 23 states have internal predecessors, (57), 7 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) [2022-11-25 16:52:10,185 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 16:52:10,185 INFO L93 Difference]: Finished difference Result 1403 states and 1876 transitions. [2022-11-25 16:52:10,186 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-11-25 16:52:10,186 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 24 states have (on average 2.375) internal successors, (57), 23 states have internal predecessors, (57), 7 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) Word has length 54 [2022-11-25 16:52:10,186 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 16:52:10,192 INFO L225 Difference]: With dead ends: 1403 [2022-11-25 16:52:10,192 INFO L226 Difference]: Without dead ends: 1060 [2022-11-25 16:52:10,194 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 81 SyntacticMatches, 1 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 689 ImplicationChecksByTransitivity, 8.5s TimeCoverageRelationStatistics Valid=523, Invalid=2447, Unknown=0, NotChecked=0, Total=2970 [2022-11-25 16:52:10,195 INFO L413 NwaCegarLoop]: 47 mSDtfsCounter, 261 mSDsluCounter, 612 mSDsCounter, 0 mSdLazyCounter, 1520 mSolverCounterSat, 235 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 267 SdHoareTripleChecker+Valid, 659 SdHoareTripleChecker+Invalid, 1755 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 235 IncrementalHoareTripleChecker+Valid, 1520 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.3s IncrementalHoareTripleChecker+Time [2022-11-25 16:52:10,196 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [267 Valid, 659 Invalid, 1755 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [235 Valid, 1520 Invalid, 0 Unknown, 0 Unchecked, 8.3s Time] [2022-11-25 16:52:10,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1060 states. [2022-11-25 16:52:10,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1060 to 909. [2022-11-25 16:52:10,543 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 909 states, 664 states have (on average 1.2725903614457832) internal successors, (845), 673 states have internal predecessors, (845), 180 states have call successors, (180), 64 states have call predecessors, (180), 64 states have return successors, (176), 171 states have call predecessors, (176), 176 states have call successors, (176) [2022-11-25 16:52:10,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 909 states to 909 states and 1201 transitions. [2022-11-25 16:52:10,549 INFO L78 Accepts]: Start accepts. Automaton has 909 states and 1201 transitions. Word has length 54 [2022-11-25 16:52:10,549 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 16:52:10,549 INFO L495 AbstractCegarLoop]: Abstraction has 909 states and 1201 transitions. [2022-11-25 16:52:10,549 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 24 states have (on average 2.375) internal successors, (57), 23 states have internal predecessors, (57), 7 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) [2022-11-25 16:52:10,550 INFO L276 IsEmpty]: Start isEmpty. Operand 909 states and 1201 transitions. [2022-11-25 16:52:10,550 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2022-11-25 16:52:10,550 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 16:52:10,551 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 16:52:10,556 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-11-25 16:52:10,754 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 16:52:10,755 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 16:52:10,755 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 16:52:10,755 INFO L85 PathProgramCache]: Analyzing trace with hash -2108492507, now seen corresponding path program 1 times [2022-11-25 16:52:10,755 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 16:52:10,755 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2014865543] [2022-11-25 16:52:10,755 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 16:52:10,756 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 16:52:10,764 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 16:52:10,764 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2073896108] [2022-11-25 16:52:10,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 16:52:10,764 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 16:52:10,765 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 16:52:10,766 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 16:52:10,775 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-11-25 16:52:10,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 16:52:10,848 INFO L263 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 15 conjunts are in the unsatisfiable core [2022-11-25 16:52:10,850 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 16:52:10,986 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 8 proven. 17 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-11-25 16:52:10,986 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 16:52:11,206 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 8 proven. 17 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-11-25 16:52:11,206 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 16:52:11,206 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2014865543] [2022-11-25 16:52:11,206 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 16:52:11,206 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2073896108] [2022-11-25 16:52:11,206 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2073896108] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 16:52:11,206 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-25 16:52:11,206 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10] total 18 [2022-11-25 16:52:11,207 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1535476269] [2022-11-25 16:52:11,207 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-25 16:52:11,207 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-11-25 16:52:11,207 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 16:52:11,208 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-11-25 16:52:11,208 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=181, Unknown=0, NotChecked=0, Total=306 [2022-11-25 16:52:11,208 INFO L87 Difference]: Start difference. First operand 909 states and 1201 transitions. Second operand has 18 states, 18 states have (on average 3.7222222222222223) internal successors, (67), 18 states have internal predecessors, (67), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2022-11-25 16:52:12,600 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 16:52:12,601 INFO L93 Difference]: Finished difference Result 2055 states and 2844 transitions. [2022-11-25 16:52:12,601 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-11-25 16:52:12,602 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 3.7222222222222223) internal successors, (67), 18 states have internal predecessors, (67), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 60 [2022-11-25 16:52:12,602 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 16:52:12,612 INFO L225 Difference]: With dead ends: 2055 [2022-11-25 16:52:12,613 INFO L226 Difference]: Without dead ends: 2033 [2022-11-25 16:52:12,614 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 102 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 94 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=287, Invalid=525, Unknown=0, NotChecked=0, Total=812 [2022-11-25 16:52:12,615 INFO L413 NwaCegarLoop]: 85 mSDtfsCounter, 311 mSDsluCounter, 315 mSDsCounter, 0 mSdLazyCounter, 213 mSolverCounterSat, 111 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 311 SdHoareTripleChecker+Valid, 400 SdHoareTripleChecker+Invalid, 324 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 111 IncrementalHoareTripleChecker+Valid, 213 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-25 16:52:12,616 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [311 Valid, 400 Invalid, 324 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [111 Valid, 213 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-25 16:52:12,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2033 states. [2022-11-25 16:52:13,500 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2033 to 1919. [2022-11-25 16:52:13,504 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1919 states, 1425 states have (on average 1.2947368421052632) internal successors, (1845), 1457 states have internal predecessors, (1845), 389 states have call successors, (389), 104 states have call predecessors, (389), 104 states have return successors, (382), 357 states have call predecessors, (382), 382 states have call successors, (382) [2022-11-25 16:52:13,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1919 states to 1919 states and 2616 transitions. [2022-11-25 16:52:13,514 INFO L78 Accepts]: Start accepts. Automaton has 1919 states and 2616 transitions. Word has length 60 [2022-11-25 16:52:13,514 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 16:52:13,514 INFO L495 AbstractCegarLoop]: Abstraction has 1919 states and 2616 transitions. [2022-11-25 16:52:13,514 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 3.7222222222222223) internal successors, (67), 18 states have internal predecessors, (67), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2022-11-25 16:52:13,515 INFO L276 IsEmpty]: Start isEmpty. Operand 1919 states and 2616 transitions. [2022-11-25 16:52:13,516 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2022-11-25 16:52:13,516 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 16:52:13,516 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 16:52:13,524 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-11-25 16:52:13,723 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-11-25 16:52:13,724 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 16:52:13,724 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 16:52:13,724 INFO L85 PathProgramCache]: Analyzing trace with hash -1447364546, now seen corresponding path program 1 times [2022-11-25 16:52:13,724 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 16:52:13,724 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [322555954] [2022-11-25 16:52:13,725 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 16:52:13,725 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 16:52:13,734 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 16:52:13,734 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [318847633] [2022-11-25 16:52:13,734 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 16:52:13,734 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 16:52:13,735 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 16:52:13,737 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 16:52:13,740 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-11-25 16:52:13,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 16:52:13,818 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 32 conjunts are in the unsatisfiable core [2022-11-25 16:52:13,820 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 16:52:14,926 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 10 proven. 41 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-25 16:52:14,927 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 16:52:15,528 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 32 proven. 10 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-11-25 16:52:15,528 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 16:52:15,528 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [322555954] [2022-11-25 16:52:15,528 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 16:52:15,529 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [318847633] [2022-11-25 16:52:15,529 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [318847633] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 16:52:15,529 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-25 16:52:15,529 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 8] total 23 [2022-11-25 16:52:15,529 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1706275906] [2022-11-25 16:52:15,529 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-25 16:52:15,530 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-11-25 16:52:15,530 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 16:52:15,531 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-11-25 16:52:15,531 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=439, Unknown=0, NotChecked=0, Total=506 [2022-11-25 16:52:15,532 INFO L87 Difference]: Start difference. First operand 1919 states and 2616 transitions. Second operand has 23 states, 23 states have (on average 3.3043478260869565) internal successors, (76), 19 states have internal predecessors, (76), 7 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) [2022-11-25 16:53:01,529 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 16:53:02,959 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.35s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 16:53:26,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 16:53:26,394 INFO L93 Difference]: Finished difference Result 2735 states and 3823 transitions. [2022-11-25 16:53:26,394 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2022-11-25 16:53:26,395 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 3.3043478260869565) internal successors, (76), 19 states have internal predecessors, (76), 7 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) Word has length 66 [2022-11-25 16:53:26,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 16:53:26,408 INFO L225 Difference]: With dead ends: 2735 [2022-11-25 16:53:26,408 INFO L226 Difference]: Without dead ends: 2733 [2022-11-25 16:53:26,411 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 189 GetRequests, 131 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 877 ImplicationChecksByTransitivity, 36.7s TimeCoverageRelationStatistics Valid=573, Invalid=2967, Unknown=0, NotChecked=0, Total=3540 [2022-11-25 16:53:26,412 INFO L413 NwaCegarLoop]: 81 mSDtfsCounter, 291 mSDsluCounter, 710 mSDsCounter, 0 mSdLazyCounter, 1633 mSolverCounterSat, 271 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 33.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 295 SdHoareTripleChecker+Valid, 791 SdHoareTripleChecker+Invalid, 1905 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 271 IncrementalHoareTripleChecker+Valid, 1633 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 33.8s IncrementalHoareTripleChecker+Time [2022-11-25 16:53:26,412 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [295 Valid, 791 Invalid, 1905 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [271 Valid, 1633 Invalid, 1 Unknown, 0 Unchecked, 33.8s Time] [2022-11-25 16:53:26,415 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2733 states. [2022-11-25 16:53:27,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2733 to 2047. [2022-11-25 16:53:27,479 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2047 states, 1534 states have (on average 1.2972620599739244) internal successors, (1990), 1574 states have internal predecessors, (1990), 401 states have call successors, (401), 111 states have call predecessors, (401), 111 states have return successors, (394), 361 states have call predecessors, (394), 394 states have call successors, (394) [2022-11-25 16:53:27,488 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2047 states to 2047 states and 2785 transitions. [2022-11-25 16:53:27,488 INFO L78 Accepts]: Start accepts. Automaton has 2047 states and 2785 transitions. Word has length 66 [2022-11-25 16:53:27,488 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 16:53:27,489 INFO L495 AbstractCegarLoop]: Abstraction has 2047 states and 2785 transitions. [2022-11-25 16:53:27,489 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 3.3043478260869565) internal successors, (76), 19 states have internal predecessors, (76), 7 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) [2022-11-25 16:53:27,489 INFO L276 IsEmpty]: Start isEmpty. Operand 2047 states and 2785 transitions. [2022-11-25 16:53:27,490 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2022-11-25 16:53:27,490 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 16:53:27,490 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 16:53:27,502 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-11-25 16:53:27,697 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 16:53:27,697 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 16:53:27,698 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 16:53:27,698 INFO L85 PathProgramCache]: Analyzing trace with hash 834529569, now seen corresponding path program 2 times [2022-11-25 16:53:27,698 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 16:53:27,698 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [650246112] [2022-11-25 16:53:27,698 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 16:53:27,698 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 16:53:27,718 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 16:53:27,719 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1288987084] [2022-11-25 16:53:27,719 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-25 16:53:27,720 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 16:53:27,720 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 16:53:27,721 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 16:53:27,746 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-11-25 16:53:27,814 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-25 16:53:27,814 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 16:53:27,816 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-25 16:53:27,817 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 16:53:27,876 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 51 proven. 0 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2022-11-25 16:53:27,877 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-25 16:53:27,877 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 16:53:27,877 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [650246112] [2022-11-25 16:53:27,877 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 16:53:27,878 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1288987084] [2022-11-25 16:53:27,878 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1288987084] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 16:53:27,878 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 16:53:27,878 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-25 16:53:27,878 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1905583641] [2022-11-25 16:53:27,879 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 16:53:27,879 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-25 16:53:27,879 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 16:53:27,880 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-25 16:53:27,880 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-25 16:53:27,880 INFO L87 Difference]: Start difference. First operand 2047 states and 2785 transitions. Second operand has 5 states, 5 states have (on average 6.2) internal successors, (31), 5 states have internal predecessors, (31), 3 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) [2022-11-25 16:53:28,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 16:53:28,756 INFO L93 Difference]: Finished difference Result 3624 states and 5009 transitions. [2022-11-25 16:53:28,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-25 16:53:28,757 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 6.2) internal successors, (31), 5 states have internal predecessors, (31), 3 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) Word has length 69 [2022-11-25 16:53:28,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 16:53:28,766 INFO L225 Difference]: With dead ends: 3624 [2022-11-25 16:53:28,766 INFO L226 Difference]: Without dead ends: 2427 [2022-11-25 16:53:28,770 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 66 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2022-11-25 16:53:28,770 INFO L413 NwaCegarLoop]: 44 mSDtfsCounter, 12 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 109 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 16:53:28,771 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 109 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 16:53:28,774 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2427 states. [2022-11-25 16:53:29,942 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2427 to 2265. [2022-11-25 16:53:29,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2265 states, 1658 states have (on average 1.2979493365500603) internal successors, (2152), 1698 states have internal predecessors, (2152), 495 states have call successors, (495), 111 states have call predecessors, (495), 111 states have return successors, (488), 455 states have call predecessors, (488), 488 states have call successors, (488) [2022-11-25 16:53:29,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2265 states to 2265 states and 3135 transitions. [2022-11-25 16:53:29,961 INFO L78 Accepts]: Start accepts. Automaton has 2265 states and 3135 transitions. Word has length 69 [2022-11-25 16:53:29,962 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 16:53:29,962 INFO L495 AbstractCegarLoop]: Abstraction has 2265 states and 3135 transitions. [2022-11-25 16:53:29,962 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 6.2) internal successors, (31), 5 states have internal predecessors, (31), 3 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) [2022-11-25 16:53:29,963 INFO L276 IsEmpty]: Start isEmpty. Operand 2265 states and 3135 transitions. [2022-11-25 16:53:29,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2022-11-25 16:53:29,964 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 16:53:29,965 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 16:53:29,977 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-11-25 16:53:30,171 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 16:53:30,171 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 16:53:30,171 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 16:53:30,172 INFO L85 PathProgramCache]: Analyzing trace with hash 211513650, now seen corresponding path program 3 times [2022-11-25 16:53:30,172 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 16:53:30,172 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [394082700] [2022-11-25 16:53:30,172 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 16:53:30,172 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 16:53:30,196 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 16:53:30,197 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1442671550] [2022-11-25 16:53:30,198 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 16:53:30,198 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 16:53:30,198 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 16:53:30,199 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 16:53:30,222 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-11-25 16:53:30,301 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-25 16:53:30,302 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 16:53:30,304 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 64 conjunts are in the unsatisfiable core [2022-11-25 16:53:30,308 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 16:53:31,826 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 10 proven. 35 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2022-11-25 16:53:31,826 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 16:53:34,005 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 16 proven. 26 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2022-11-25 16:53:34,006 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 16:53:34,006 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [394082700] [2022-11-25 16:53:34,006 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 16:53:34,006 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1442671550] [2022-11-25 16:53:34,006 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1442671550] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 16:53:34,007 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-25 16:53:34,007 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 13] total 28 [2022-11-25 16:53:34,007 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [817059781] [2022-11-25 16:53:34,007 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-25 16:53:34,008 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-11-25 16:53:34,008 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 16:53:34,008 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-11-25 16:53:34,009 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=636, Unknown=0, NotChecked=0, Total=756 [2022-11-25 16:53:34,009 INFO L87 Difference]: Start difference. First operand 2265 states and 3135 transitions. Second operand has 28 states, 27 states have (on average 2.8518518518518516) internal successors, (77), 25 states have internal predecessors, (77), 7 states have call successors, (16), 3 states have call predecessors, (16), 2 states have return successors, (14), 6 states have call predecessors, (14), 7 states have call successors, (14) [2022-11-25 16:54:23,872 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 16:54:23,872 INFO L93 Difference]: Finished difference Result 2927 states and 4070 transitions. [2022-11-25 16:54:23,872 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2022-11-25 16:54:23,873 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 27 states have (on average 2.8518518518518516) internal successors, (77), 25 states have internal predecessors, (77), 7 states have call successors, (16), 3 states have call predecessors, (16), 2 states have return successors, (14), 6 states have call predecessors, (14), 7 states have call successors, (14) Word has length 71 [2022-11-25 16:54:23,873 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 16:54:23,889 INFO L225 Difference]: With dead ends: 2927 [2022-11-25 16:54:23,889 INFO L226 Difference]: Without dead ends: 2925 [2022-11-25 16:54:23,892 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 114 SyntacticMatches, 0 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1262 ImplicationChecksByTransitivity, 31.7s TimeCoverageRelationStatistics Valid=978, Invalid=3578, Unknown=0, NotChecked=0, Total=4556 [2022-11-25 16:54:23,893 INFO L413 NwaCegarLoop]: 105 mSDtfsCounter, 533 mSDsluCounter, 960 mSDsCounter, 0 mSdLazyCounter, 1506 mSolverCounterSat, 473 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 18.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 533 SdHoareTripleChecker+Valid, 1065 SdHoareTripleChecker+Invalid, 1979 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 473 IncrementalHoareTripleChecker+Valid, 1506 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 18.8s IncrementalHoareTripleChecker+Time [2022-11-25 16:54:23,894 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [533 Valid, 1065 Invalid, 1979 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [473 Valid, 1506 Invalid, 0 Unknown, 0 Unchecked, 18.8s Time] [2022-11-25 16:54:23,898 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2925 states. [2022-11-25 16:54:25,221 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2925 to 2594. [2022-11-25 16:54:25,225 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2594 states, 1915 states have (on average 1.2971279373368145) internal successors, (2484), 1962 states have internal predecessors, (2484), 540 states have call successors, (540), 138 states have call predecessors, (540), 138 states have return successors, (533), 493 states have call predecessors, (533), 533 states have call successors, (533) [2022-11-25 16:54:25,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2594 states to 2594 states and 3557 transitions. [2022-11-25 16:54:25,233 INFO L78 Accepts]: Start accepts. Automaton has 2594 states and 3557 transitions. Word has length 71 [2022-11-25 16:54:25,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 16:54:25,234 INFO L495 AbstractCegarLoop]: Abstraction has 2594 states and 3557 transitions. [2022-11-25 16:54:25,234 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 27 states have (on average 2.8518518518518516) internal successors, (77), 25 states have internal predecessors, (77), 7 states have call successors, (16), 3 states have call predecessors, (16), 2 states have return successors, (14), 6 states have call predecessors, (14), 7 states have call successors, (14) [2022-11-25 16:54:25,234 INFO L276 IsEmpty]: Start isEmpty. Operand 2594 states and 3557 transitions. [2022-11-25 16:54:25,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2022-11-25 16:54:25,236 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 16:54:25,236 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 16:54:25,248 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-11-25 16:54:25,442 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2022-11-25 16:54:25,442 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 16:54:25,443 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 16:54:25,443 INFO L85 PathProgramCache]: Analyzing trace with hash 940337767, now seen corresponding path program 1 times [2022-11-25 16:54:25,443 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 16:54:25,444 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1218702973] [2022-11-25 16:54:25,444 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 16:54:25,444 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 16:54:25,452 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 16:54:25,452 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1079671836] [2022-11-25 16:54:25,453 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 16:54:25,453 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 16:54:25,453 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 16:54:25,454 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 16:54:25,466 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-11-25 16:54:25,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 16:54:25,547 INFO L263 TraceCheckSpWp]: Trace formula consists of 215 conjuncts, 31 conjunts are in the unsatisfiable core [2022-11-25 16:54:25,550 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 16:54:25,947 INFO L134 CoverageAnalysis]: Checked inductivity of 224 backedges. 20 proven. 23 refuted. 0 times theorem prover too weak. 181 trivial. 0 not checked. [2022-11-25 16:54:25,947 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 16:54:26,833 INFO L134 CoverageAnalysis]: Checked inductivity of 224 backedges. 23 proven. 17 refuted. 0 times theorem prover too weak. 184 trivial. 0 not checked. [2022-11-25 16:54:26,833 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 16:54:26,833 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1218702973] [2022-11-25 16:54:26,833 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 16:54:26,834 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1079671836] [2022-11-25 16:54:26,834 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1079671836] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 16:54:26,834 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-25 16:54:26,834 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 10] total 21 [2022-11-25 16:54:26,834 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1060258434] [2022-11-25 16:54:26,835 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-25 16:54:26,835 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-11-25 16:54:26,835 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 16:54:26,836 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-11-25 16:54:26,837 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=339, Unknown=0, NotChecked=0, Total=420 [2022-11-25 16:54:26,837 INFO L87 Difference]: Start difference. First operand 2594 states and 3557 transitions. Second operand has 21 states, 21 states have (on average 2.4761904761904763) internal successors, (52), 18 states have internal predecessors, (52), 8 states have call successors, (25), 3 states have call predecessors, (25), 2 states have return successors, (24), 8 states have call predecessors, (24), 8 states have call successors, (24) [2022-11-25 16:54:31,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 16:54:31,837 INFO L93 Difference]: Finished difference Result 3911 states and 5653 transitions. [2022-11-25 16:54:31,838 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-11-25 16:54:31,838 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 2.4761904761904763) internal successors, (52), 18 states have internal predecessors, (52), 8 states have call successors, (25), 3 states have call predecessors, (25), 2 states have return successors, (24), 8 states have call predecessors, (24), 8 states have call successors, (24) Word has length 85 [2022-11-25 16:54:31,838 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 16:54:31,851 INFO L225 Difference]: With dead ends: 3911 [2022-11-25 16:54:31,851 INFO L226 Difference]: Without dead ends: 3909 [2022-11-25 16:54:31,854 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 191 GetRequests, 150 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 394 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=392, Invalid=1414, Unknown=0, NotChecked=0, Total=1806 [2022-11-25 16:54:31,855 INFO L413 NwaCegarLoop]: 88 mSDtfsCounter, 207 mSDsluCounter, 647 mSDsCounter, 0 mSdLazyCounter, 741 mSolverCounterSat, 180 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 211 SdHoareTripleChecker+Valid, 735 SdHoareTripleChecker+Invalid, 921 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 180 IncrementalHoareTripleChecker+Valid, 741 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2022-11-25 16:54:31,855 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [211 Valid, 735 Invalid, 921 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [180 Valid, 741 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2022-11-25 16:54:31,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3909 states. [2022-11-25 16:54:34,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3909 to 3544. [2022-11-25 16:54:34,111 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3544 states, 2393 states have (on average 1.3418303384872545) internal successors, (3211), 2464 states have internal predecessors, (3211), 996 states have call successors, (996), 154 states have call predecessors, (996), 154 states have return successors, (989), 925 states have call predecessors, (989), 989 states have call successors, (989) [2022-11-25 16:54:34,175 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3544 states to 3544 states and 5196 transitions. [2022-11-25 16:54:34,175 INFO L78 Accepts]: Start accepts. Automaton has 3544 states and 5196 transitions. Word has length 85 [2022-11-25 16:54:34,176 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 16:54:34,176 INFO L495 AbstractCegarLoop]: Abstraction has 3544 states and 5196 transitions. [2022-11-25 16:54:34,176 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 2.4761904761904763) internal successors, (52), 18 states have internal predecessors, (52), 8 states have call successors, (25), 3 states have call predecessors, (25), 2 states have return successors, (24), 8 states have call predecessors, (24), 8 states have call successors, (24) [2022-11-25 16:54:34,177 INFO L276 IsEmpty]: Start isEmpty. Operand 3544 states and 5196 transitions. [2022-11-25 16:54:34,180 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2022-11-25 16:54:34,181 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 16:54:34,181 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 16:54:34,193 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2022-11-25 16:54:34,387 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2022-11-25 16:54:34,387 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 16:54:34,388 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 16:54:34,388 INFO L85 PathProgramCache]: Analyzing trace with hash -1813624164, now seen corresponding path program 1 times [2022-11-25 16:54:34,388 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 16:54:34,388 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [844547340] [2022-11-25 16:54:34,388 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 16:54:34,388 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 16:54:34,401 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 16:54:34,402 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [855184280] [2022-11-25 16:54:34,402 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 16:54:34,402 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 16:54:34,402 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 16:54:34,404 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 16:54:34,412 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-11-25 16:54:34,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 16:54:34,497 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 77 conjunts are in the unsatisfiable core [2022-11-25 16:54:34,501 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 16:54:36,242 INFO L134 CoverageAnalysis]: Checked inductivity of 158 backedges. 30 proven. 36 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2022-11-25 16:54:36,243 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 16:54:42,695 INFO L134 CoverageAnalysis]: Checked inductivity of 158 backedges. 30 proven. 33 refuted. 0 times theorem prover too weak. 95 trivial. 0 not checked. [2022-11-25 16:54:42,696 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 16:54:42,696 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [844547340] [2022-11-25 16:54:42,696 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 16:54:42,696 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [855184280] [2022-11-25 16:54:42,696 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [855184280] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 16:54:42,697 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-25 16:54:42,697 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 16] total 33 [2022-11-25 16:54:42,697 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [71685510] [2022-11-25 16:54:42,697 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-25 16:54:42,698 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-11-25 16:54:42,698 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 16:54:42,699 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-11-25 16:54:42,700 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=911, Unknown=0, NotChecked=0, Total=1056 [2022-11-25 16:54:42,700 INFO L87 Difference]: Start difference. First operand 3544 states and 5196 transitions. Second operand has 33 states, 31 states have (on average 2.4838709677419355) internal successors, (77), 31 states have internal predecessors, (77), 9 states have call successors, (21), 3 states have call predecessors, (21), 3 states have return successors, (20), 7 states have call predecessors, (20), 7 states have call successors, (20) [2022-11-25 16:54:44,367 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.25s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 16:56:00,408 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.01s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 16:56:36,560 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 16:56:53,016 WARN L233 SmtUtils]: Spent 6.93s on a formula simplification. DAG size of input: 110 DAG size of output: 96 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-25 16:57:13,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 16:57:13,928 INFO L93 Difference]: Finished difference Result 5248 states and 7800 transitions. [2022-11-25 16:57:13,928 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2022-11-25 16:57:13,928 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 31 states have (on average 2.4838709677419355) internal successors, (77), 31 states have internal predecessors, (77), 9 states have call successors, (21), 3 states have call predecessors, (21), 3 states have return successors, (20), 7 states have call predecessors, (20), 7 states have call successors, (20) Word has length 84 [2022-11-25 16:57:13,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 16:57:13,952 INFO L225 Difference]: With dead ends: 5248 [2022-11-25 16:57:13,952 INFO L226 Difference]: Without dead ends: 5211 [2022-11-25 16:57:13,957 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 252 GetRequests, 133 SyntacticMatches, 2 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5060 ImplicationChecksByTransitivity, 95.4s TimeCoverageRelationStatistics Valid=2693, Invalid=11349, Unknown=0, NotChecked=0, Total=14042 [2022-11-25 16:57:13,958 INFO L413 NwaCegarLoop]: 87 mSDtfsCounter, 564 mSDsluCounter, 993 mSDsCounter, 0 mSdLazyCounter, 2825 mSolverCounterSat, 645 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 55.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 564 SdHoareTripleChecker+Valid, 1080 SdHoareTripleChecker+Invalid, 3471 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 645 IncrementalHoareTripleChecker+Valid, 2825 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 55.8s IncrementalHoareTripleChecker+Time [2022-11-25 16:57:13,959 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [564 Valid, 1080 Invalid, 3471 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [645 Valid, 2825 Invalid, 1 Unknown, 0 Unchecked, 55.8s Time] [2022-11-25 16:57:13,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5211 states. [2022-11-25 16:57:18,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5211 to 4002. [2022-11-25 16:57:18,070 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4002 states, 2768 states have (on average 1.3435693641618498) internal successors, (3719), 2841 states have internal predecessors, (3719), 1069 states have call successors, (1069), 164 states have call predecessors, (1069), 164 states have return successors, (1062), 996 states have call predecessors, (1062), 1062 states have call successors, (1062) [2022-11-25 16:57:18,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4002 states to 4002 states and 5850 transitions. [2022-11-25 16:57:18,087 INFO L78 Accepts]: Start accepts. Automaton has 4002 states and 5850 transitions. Word has length 84 [2022-11-25 16:57:18,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 16:57:18,087 INFO L495 AbstractCegarLoop]: Abstraction has 4002 states and 5850 transitions. [2022-11-25 16:57:18,088 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 31 states have (on average 2.4838709677419355) internal successors, (77), 31 states have internal predecessors, (77), 9 states have call successors, (21), 3 states have call predecessors, (21), 3 states have return successors, (20), 7 states have call predecessors, (20), 7 states have call successors, (20) [2022-11-25 16:57:18,088 INFO L276 IsEmpty]: Start isEmpty. Operand 4002 states and 5850 transitions. [2022-11-25 16:57:18,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2022-11-25 16:57:18,090 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 16:57:18,090 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 16:57:18,103 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2022-11-25 16:57:18,303 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 16:57:18,303 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 16:57:18,303 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 16:57:18,303 INFO L85 PathProgramCache]: Analyzing trace with hash -1186023176, now seen corresponding path program 1 times [2022-11-25 16:57:18,303 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 16:57:18,304 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [213953844] [2022-11-25 16:57:18,304 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 16:57:18,304 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 16:57:18,310 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 16:57:18,311 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1879559362] [2022-11-25 16:57:18,311 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 16:57:18,311 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 16:57:18,311 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 16:57:18,312 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 16:57:18,318 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-11-25 16:57:18,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 16:57:18,388 INFO L263 TraceCheckSpWp]: Trace formula consists of 236 conjuncts, 51 conjunts are in the unsatisfiable core [2022-11-25 16:57:18,391 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 16:57:19,631 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 18 proven. 30 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2022-11-25 16:57:19,632 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 16:57:21,461 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 18 proven. 27 refuted. 0 times theorem prover too weak. 148 trivial. 0 not checked. [2022-11-25 16:57:21,461 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 16:57:21,462 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [213953844] [2022-11-25 16:57:21,462 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 16:57:21,462 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1879559362] [2022-11-25 16:57:21,462 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1879559362] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 16:57:21,462 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-25 16:57:21,462 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 12] total 26 [2022-11-25 16:57:21,462 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1511682824] [2022-11-25 16:57:21,462 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-25 16:57:21,463 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-25 16:57:21,463 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 16:57:21,463 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-25 16:57:21,464 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=544, Unknown=0, NotChecked=0, Total=650 [2022-11-25 16:57:21,464 INFO L87 Difference]: Start difference. First operand 4002 states and 5850 transitions. Second operand has 26 states, 25 states have (on average 2.76) internal successors, (69), 23 states have internal predecessors, (69), 9 states have call successors, (24), 3 states have call predecessors, (24), 2 states have return successors, (22), 8 states have call predecessors, (22), 9 states have call successors, (22) [2022-11-25 16:57:35,455 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 16:57:49,269 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 16:58:01,813 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 16:58:05,495 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 16:58:27,004 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.69s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 16:58:28,324 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.32s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 16:58:36,630 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.16s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 16:58:49,582 WARN L233 SmtUtils]: Spent 8.00s on a formula simplification that was a NOOP. DAG size: 82 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-25 16:59:13,595 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 16:59:13,595 INFO L93 Difference]: Finished difference Result 4966 states and 7324 transitions. [2022-11-25 16:59:13,596 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2022-11-25 16:59:13,596 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 2.76) internal successors, (69), 23 states have internal predecessors, (69), 9 states have call successors, (24), 3 states have call predecessors, (24), 2 states have return successors, (22), 8 states have call predecessors, (22), 9 states have call successors, (22) Word has length 87 [2022-11-25 16:59:13,596 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 16:59:13,618 INFO L225 Difference]: With dead ends: 4966 [2022-11-25 16:59:13,618 INFO L226 Difference]: Without dead ends: 4960 [2022-11-25 16:59:13,621 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 229 GetRequests, 148 SyntacticMatches, 0 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2076 ImplicationChecksByTransitivity, 59.3s TimeCoverageRelationStatistics Valid=1488, Invalid=5318, Unknown=0, NotChecked=0, Total=6806 [2022-11-25 16:59:13,622 INFO L413 NwaCegarLoop]: 129 mSDtfsCounter, 398 mSDsluCounter, 1102 mSDsCounter, 0 mSdLazyCounter, 1910 mSolverCounterSat, 553 mSolverCounterUnsat, 4 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 48.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 398 SdHoareTripleChecker+Valid, 1231 SdHoareTripleChecker+Invalid, 2467 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 553 IncrementalHoareTripleChecker+Valid, 1910 IncrementalHoareTripleChecker+Invalid, 4 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 48.9s IncrementalHoareTripleChecker+Time [2022-11-25 16:59:13,623 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [398 Valid, 1231 Invalid, 2467 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [553 Valid, 1910 Invalid, 4 Unknown, 0 Unchecked, 48.9s Time] [2022-11-25 16:59:13,627 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4960 states. [2022-11-25 16:59:18,084 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4960 to 4493. [2022-11-25 16:59:18,089 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4493 states, 3084 states have (on average 1.3495460440985734) internal successors, (4162), 3162 states have internal predecessors, (4162), 1224 states have call successors, (1224), 185 states have call predecessors, (1224), 184 states have return successors, (1218), 1145 states have call predecessors, (1218), 1218 states have call successors, (1218) [2022-11-25 16:59:18,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4493 states to 4493 states and 6604 transitions. [2022-11-25 16:59:18,101 INFO L78 Accepts]: Start accepts. Automaton has 4493 states and 6604 transitions. Word has length 87 [2022-11-25 16:59:18,102 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 16:59:18,102 INFO L495 AbstractCegarLoop]: Abstraction has 4493 states and 6604 transitions. [2022-11-25 16:59:18,103 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 2.76) internal successors, (69), 23 states have internal predecessors, (69), 9 states have call successors, (24), 3 states have call predecessors, (24), 2 states have return successors, (22), 8 states have call predecessors, (22), 9 states have call successors, (22) [2022-11-25 16:59:18,103 INFO L276 IsEmpty]: Start isEmpty. Operand 4493 states and 6604 transitions. [2022-11-25 16:59:18,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2022-11-25 16:59:18,105 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 16:59:18,105 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 5, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 16:59:18,111 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2022-11-25 16:59:18,311 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2022-11-25 16:59:18,311 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 16:59:18,311 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 16:59:18,311 INFO L85 PathProgramCache]: Analyzing trace with hash 348816342, now seen corresponding path program 1 times [2022-11-25 16:59:18,311 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 16:59:18,312 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1266405085] [2022-11-25 16:59:18,312 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 16:59:18,312 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 16:59:18,318 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 16:59:18,318 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [504230659] [2022-11-25 16:59:18,318 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 16:59:18,319 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 16:59:18,319 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 16:59:18,320 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 16:59:18,325 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-11-25 16:59:18,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 16:59:18,397 INFO L263 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 21 conjunts are in the unsatisfiable core [2022-11-25 16:59:18,399 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 16:59:18,568 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 27 proven. 108 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2022-11-25 16:59:18,568 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 16:59:18,845 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 27 proven. 44 refuted. 0 times theorem prover too weak. 116 trivial. 0 not checked. [2022-11-25 16:59:18,845 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 16:59:18,845 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1266405085] [2022-11-25 16:59:18,846 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 16:59:18,846 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [504230659] [2022-11-25 16:59:18,846 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [504230659] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 16:59:18,846 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-25 16:59:18,846 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 24 [2022-11-25 16:59:18,846 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [129427645] [2022-11-25 16:59:18,846 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-25 16:59:18,847 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-11-25 16:59:18,847 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 16:59:18,848 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-11-25 16:59:18,848 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=236, Invalid=316, Unknown=0, NotChecked=0, Total=552 [2022-11-25 16:59:18,848 INFO L87 Difference]: Start difference. First operand 4493 states and 6604 transitions. Second operand has 24 states, 24 states have (on average 3.9166666666666665) internal successors, (94), 24 states have internal predecessors, (94), 7 states have call successors, (21), 5 states have call predecessors, (21), 4 states have return successors, (20), 6 states have call predecessors, (20), 6 states have call successors, (20) [2022-11-25 16:59:31,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 16:59:31,403 INFO L93 Difference]: Finished difference Result 11740 states and 18374 transitions. [2022-11-25 16:59:31,403 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-11-25 16:59:31,403 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 3.9166666666666665) internal successors, (94), 24 states have internal predecessors, (94), 7 states have call successors, (21), 5 states have call predecessors, (21), 4 states have return successors, (20), 6 states have call predecessors, (20), 6 states have call successors, (20) Word has length 94 [2022-11-25 16:59:31,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 16:59:31,441 INFO L225 Difference]: With dead ends: 11740 [2022-11-25 16:59:31,442 INFO L226 Difference]: Without dead ends: 10053 [2022-11-25 16:59:31,449 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 203 GetRequests, 164 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 228 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=585, Invalid=1055, Unknown=0, NotChecked=0, Total=1640 [2022-11-25 16:59:31,450 INFO L413 NwaCegarLoop]: 109 mSDtfsCounter, 410 mSDsluCounter, 487 mSDsCounter, 0 mSdLazyCounter, 393 mSolverCounterSat, 108 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 410 SdHoareTripleChecker+Valid, 596 SdHoareTripleChecker+Invalid, 501 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 108 IncrementalHoareTripleChecker+Valid, 393 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-25 16:59:31,450 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [410 Valid, 596 Invalid, 501 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [108 Valid, 393 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-25 16:59:31,459 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10053 states. [2022-11-25 16:59:42,677 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10053 to 9696. [2022-11-25 16:59:42,685 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9696 states, 6001 states have (on average 1.375437427095484) internal successors, (8254), 6069 states have internal predecessors, (8254), 3372 states have call successors, (3372), 323 states have call predecessors, (3372), 322 states have return successors, (3360), 3303 states have call predecessors, (3360), 3360 states have call successors, (3360) [2022-11-25 16:59:42,722 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9696 states to 9696 states and 14986 transitions. [2022-11-25 16:59:42,723 INFO L78 Accepts]: Start accepts. Automaton has 9696 states and 14986 transitions. Word has length 94 [2022-11-25 16:59:42,723 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 16:59:42,723 INFO L495 AbstractCegarLoop]: Abstraction has 9696 states and 14986 transitions. [2022-11-25 16:59:42,723 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 3.9166666666666665) internal successors, (94), 24 states have internal predecessors, (94), 7 states have call successors, (21), 5 states have call predecessors, (21), 4 states have return successors, (20), 6 states have call predecessors, (20), 6 states have call successors, (20) [2022-11-25 16:59:42,724 INFO L276 IsEmpty]: Start isEmpty. Operand 9696 states and 14986 transitions. [2022-11-25 16:59:42,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2022-11-25 16:59:42,726 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 16:59:42,726 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 5, 5, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 16:59:42,732 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2022-11-25 16:59:42,932 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 16:59:42,932 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 16:59:42,932 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 16:59:42,932 INFO L85 PathProgramCache]: Analyzing trace with hash -1461558211, now seen corresponding path program 2 times [2022-11-25 16:59:42,932 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 16:59:42,932 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1566546189] [2022-11-25 16:59:42,933 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 16:59:42,933 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 16:59:42,949 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 16:59:42,954 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1060409112] [2022-11-25 16:59:42,954 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-25 16:59:42,955 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 16:59:42,955 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 16:59:42,956 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 16:59:42,963 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-11-25 16:59:43,045 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-25 16:59:43,045 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 16:59:43,047 INFO L263 TraceCheckSpWp]: Trace formula consists of 279 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-25 16:59:43,049 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 16:59:43,166 INFO L134 CoverageAnalysis]: Checked inductivity of 191 backedges. 48 proven. 21 refuted. 0 times theorem prover too weak. 122 trivial. 0 not checked. [2022-11-25 16:59:43,166 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 16:59:43,303 INFO L134 CoverageAnalysis]: Checked inductivity of 191 backedges. 48 proven. 21 refuted. 0 times theorem prover too weak. 122 trivial. 0 not checked. [2022-11-25 16:59:43,304 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 16:59:43,304 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1566546189] [2022-11-25 16:59:43,304 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 16:59:43,304 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1060409112] [2022-11-25 16:59:43,304 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1060409112] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 16:59:43,304 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-25 16:59:43,304 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 11 [2022-11-25 16:59:43,304 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1717296565] [2022-11-25 16:59:43,304 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-25 16:59:43,305 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-11-25 16:59:43,305 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 16:59:43,305 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-11-25 16:59:43,305 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=89, Unknown=0, NotChecked=0, Total=110 [2022-11-25 16:59:43,306 INFO L87 Difference]: Start difference. First operand 9696 states and 14986 transitions. Second operand has 11 states, 11 states have (on average 4.2727272727272725) internal successors, (47), 11 states have internal predecessors, (47), 4 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2022-11-25 16:59:59,219 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 16:59:59,220 INFO L93 Difference]: Finished difference Result 13475 states and 20889 transitions. [2022-11-25 16:59:59,220 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-11-25 16:59:59,220 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 4.2727272727272725) internal successors, (47), 11 states have internal predecessors, (47), 4 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 95 [2022-11-25 16:59:59,220 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 16:59:59,273 INFO L225 Difference]: With dead ends: 13475 [2022-11-25 16:59:59,273 INFO L226 Difference]: Without dead ends: 12893 [2022-11-25 16:59:59,280 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 234 GetRequests, 188 SyntacticMatches, 7 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 437 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=347, Invalid=1293, Unknown=0, NotChecked=0, Total=1640 [2022-11-25 16:59:59,280 INFO L413 NwaCegarLoop]: 122 mSDtfsCounter, 234 mSDsluCounter, 411 mSDsCounter, 0 mSdLazyCounter, 640 mSolverCounterSat, 123 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 238 SdHoareTripleChecker+Valid, 533 SdHoareTripleChecker+Invalid, 763 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 123 IncrementalHoareTripleChecker+Valid, 640 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-25 16:59:59,281 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [238 Valid, 533 Invalid, 763 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [123 Valid, 640 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-25 16:59:59,292 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12893 states. [2022-11-25 17:00:09,911 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12893 to 9800. [2022-11-25 17:00:09,919 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9800 states, 6111 states have (on average 1.3735886107020128) internal successors, (8394), 6181 states have internal predecessors, (8394), 3366 states have call successors, (3366), 323 states have call predecessors, (3366), 322 states have return successors, (3354), 3295 states have call predecessors, (3354), 3354 states have call successors, (3354) [2022-11-25 17:00:09,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9800 states to 9800 states and 15114 transitions. [2022-11-25 17:00:09,957 INFO L78 Accepts]: Start accepts. Automaton has 9800 states and 15114 transitions. Word has length 95 [2022-11-25 17:00:09,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 17:00:09,958 INFO L495 AbstractCegarLoop]: Abstraction has 9800 states and 15114 transitions. [2022-11-25 17:00:09,958 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 4.2727272727272725) internal successors, (47), 11 states have internal predecessors, (47), 4 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2022-11-25 17:00:09,958 INFO L276 IsEmpty]: Start isEmpty. Operand 9800 states and 15114 transitions. [2022-11-25 17:00:09,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2022-11-25 17:00:09,961 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 17:00:09,961 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 17:00:09,973 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2022-11-25 17:00:10,173 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2022-11-25 17:00:10,173 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 17:00:10,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 17:00:10,173 INFO L85 PathProgramCache]: Analyzing trace with hash -737280076, now seen corresponding path program 2 times [2022-11-25 17:00:10,174 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 17:00:10,174 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1211540622] [2022-11-25 17:00:10,174 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:00:10,174 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 17:00:10,187 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 17:00:10,187 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1749847382] [2022-11-25 17:00:10,188 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-25 17:00:10,188 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 17:00:10,188 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 17:00:10,189 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 17:00:10,223 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-11-25 17:00:10,288 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-25 17:00:10,289 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 17:00:10,291 INFO L263 TraceCheckSpWp]: Trace formula consists of 265 conjuncts, 70 conjunts are in the unsatisfiable core [2022-11-25 17:00:10,294 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 17:00:11,890 INFO L134 CoverageAnalysis]: Checked inductivity of 326 backedges. 29 proven. 65 refuted. 0 times theorem prover too weak. 232 trivial. 0 not checked. [2022-11-25 17:00:11,890 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 17:00:24,212 INFO L134 CoverageAnalysis]: Checked inductivity of 326 backedges. 26 proven. 65 refuted. 0 times theorem prover too weak. 235 trivial. 0 not checked. [2022-11-25 17:00:24,213 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 17:00:24,213 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1211540622] [2022-11-25 17:00:24,213 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 17:00:24,213 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1749847382] [2022-11-25 17:00:24,213 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1749847382] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 17:00:24,213 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-25 17:00:24,213 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 16] total 32 [2022-11-25 17:00:24,214 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1919363609] [2022-11-25 17:00:24,214 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-25 17:00:24,214 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-11-25 17:00:24,214 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 17:00:24,215 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-11-25 17:00:24,215 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=846, Unknown=0, NotChecked=0, Total=992 [2022-11-25 17:00:24,216 INFO L87 Difference]: Start difference. First operand 9800 states and 15114 transitions. Second operand has 32 states, 30 states have (on average 2.566666666666667) internal successors, (77), 29 states have internal predecessors, (77), 10 states have call successors, (28), 3 states have call predecessors, (28), 3 states have return successors, (27), 9 states have call predecessors, (27), 8 states have call successors, (27) [2022-11-25 17:02:04,381 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 17:02:04,382 INFO L93 Difference]: Finished difference Result 15147 states and 23116 transitions. [2022-11-25 17:02:04,382 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2022-11-25 17:02:04,382 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 30 states have (on average 2.566666666666667) internal successors, (77), 29 states have internal predecessors, (77), 10 states have call successors, (28), 3 states have call predecessors, (28), 3 states have return successors, (27), 9 states have call predecessors, (27), 8 states have call successors, (27) Word has length 104 [2022-11-25 17:02:04,383 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 17:02:04,426 INFO L225 Difference]: With dead ends: 15147 [2022-11-25 17:02:04,427 INFO L226 Difference]: Without dead ends: 11565 [2022-11-25 17:02:04,440 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 275 GetRequests, 175 SyntacticMatches, 1 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2983 ImplicationChecksByTransitivity, 59.5s TimeCoverageRelationStatistics Valid=1844, Invalid=8256, Unknown=0, NotChecked=0, Total=10100 [2022-11-25 17:02:04,441 INFO L413 NwaCegarLoop]: 78 mSDtfsCounter, 386 mSDsluCounter, 1017 mSDsCounter, 0 mSdLazyCounter, 2520 mSolverCounterSat, 573 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 34.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 386 SdHoareTripleChecker+Valid, 1095 SdHoareTripleChecker+Invalid, 3093 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 573 IncrementalHoareTripleChecker+Valid, 2520 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 34.3s IncrementalHoareTripleChecker+Time [2022-11-25 17:02:04,441 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [386 Valid, 1095 Invalid, 3093 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [573 Valid, 2520 Invalid, 0 Unknown, 0 Unchecked, 34.3s Time] [2022-11-25 17:02:04,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11565 states. [2022-11-25 17:02:17,465 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11565 to 10476. [2022-11-25 17:02:17,473 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10476 states, 6558 states have (on average 1.373437023482769) internal successors, (9007), 6623 states have internal predecessors, (9007), 3587 states have call successors, (3587), 330 states have call predecessors, (3587), 330 states have return successors, (3576), 3522 states have call predecessors, (3576), 3576 states have call successors, (3576) [2022-11-25 17:02:17,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10476 states to 10476 states and 16170 transitions. [2022-11-25 17:02:17,514 INFO L78 Accepts]: Start accepts. Automaton has 10476 states and 16170 transitions. Word has length 104 [2022-11-25 17:02:17,515 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 17:02:17,515 INFO L495 AbstractCegarLoop]: Abstraction has 10476 states and 16170 transitions. [2022-11-25 17:02:17,515 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 30 states have (on average 2.566666666666667) internal successors, (77), 29 states have internal predecessors, (77), 10 states have call successors, (28), 3 states have call predecessors, (28), 3 states have return successors, (27), 9 states have call predecessors, (27), 8 states have call successors, (27) [2022-11-25 17:02:17,515 INFO L276 IsEmpty]: Start isEmpty. Operand 10476 states and 16170 transitions. [2022-11-25 17:02:17,518 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2022-11-25 17:02:17,518 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 17:02:17,518 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 7, 7, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 17:02:17,531 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2022-11-25 17:02:17,724 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2022-11-25 17:02:17,724 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 17:02:17,725 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 17:02:17,725 INFO L85 PathProgramCache]: Analyzing trace with hash -1018938325, now seen corresponding path program 1 times [2022-11-25 17:02:17,725 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 17:02:17,725 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [110689588] [2022-11-25 17:02:17,725 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:02:17,725 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 17:02:17,738 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 17:02:17,738 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [118790644] [2022-11-25 17:02:17,738 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:02:17,739 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 17:02:17,739 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 17:02:17,740 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 17:02:17,767 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2022-11-25 17:02:17,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 17:02:17,832 INFO L263 TraceCheckSpWp]: Trace formula consists of 316 conjuncts, 23 conjunts are in the unsatisfiable core [2022-11-25 17:02:17,834 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 17:02:18,041 INFO L134 CoverageAnalysis]: Checked inductivity of 238 backedges. 67 proven. 116 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-11-25 17:02:18,041 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 17:02:18,367 INFO L134 CoverageAnalysis]: Checked inductivity of 238 backedges. 67 proven. 52 refuted. 0 times theorem prover too weak. 119 trivial. 0 not checked. [2022-11-25 17:02:18,367 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 17:02:18,367 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [110689588] [2022-11-25 17:02:18,367 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 17:02:18,368 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [118790644] [2022-11-25 17:02:18,368 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [118790644] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 17:02:18,368 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-25 17:02:18,368 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14] total 26 [2022-11-25 17:02:18,368 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [519595464] [2022-11-25 17:02:18,368 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-25 17:02:18,369 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-25 17:02:18,369 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 17:02:18,369 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-25 17:02:18,370 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=281, Invalid=369, Unknown=0, NotChecked=0, Total=650 [2022-11-25 17:02:18,370 INFO L87 Difference]: Start difference. First operand 10476 states and 16170 transitions. Second operand has 26 states, 26 states have (on average 4.115384615384615) internal successors, (107), 26 states have internal predecessors, (107), 7 states have call successors, (21), 5 states have call predecessors, (21), 4 states have return successors, (20), 6 states have call predecessors, (20), 6 states have call successors, (20) [2022-11-25 17:02:34,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 17:02:34,203 INFO L93 Difference]: Finished difference Result 18621 states and 28957 transitions. [2022-11-25 17:02:34,203 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2022-11-25 17:02:34,204 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 4.115384615384615) internal successors, (107), 26 states have internal predecessors, (107), 7 states have call successors, (21), 5 states have call predecessors, (21), 4 states have return successors, (20), 6 states have call predecessors, (20), 6 states have call successors, (20) Word has length 106 [2022-11-25 17:02:34,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 17:02:34,248 INFO L225 Difference]: With dead ends: 18621 [2022-11-25 17:02:34,248 INFO L226 Difference]: Without dead ends: 11869 [2022-11-25 17:02:34,266 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 229 GetRequests, 186 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 282 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=708, Invalid=1272, Unknown=0, NotChecked=0, Total=1980 [2022-11-25 17:02:34,267 INFO L413 NwaCegarLoop]: 120 mSDtfsCounter, 486 mSDsluCounter, 614 mSDsCounter, 0 mSdLazyCounter, 450 mSolverCounterSat, 159 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 486 SdHoareTripleChecker+Valid, 734 SdHoareTripleChecker+Invalid, 609 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 159 IncrementalHoareTripleChecker+Valid, 450 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-25 17:02:34,267 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [486 Valid, 734 Invalid, 609 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [159 Valid, 450 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-25 17:02:34,276 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11869 states. [2022-11-25 17:02:49,253 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11869 to 11677. [2022-11-25 17:02:49,259 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11677 states, 7169 states have (on average 1.267122332263914) internal successors, (9084), 7199 states have internal predecessors, (9084), 4133 states have call successors, (4133), 374 states have call predecessors, (4133), 374 states have return successors, (4120), 4103 states have call predecessors, (4120), 4120 states have call successors, (4120) [2022-11-25 17:02:49,302 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11677 states to 11677 states and 17337 transitions. [2022-11-25 17:02:49,304 INFO L78 Accepts]: Start accepts. Automaton has 11677 states and 17337 transitions. Word has length 106 [2022-11-25 17:02:49,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 17:02:49,304 INFO L495 AbstractCegarLoop]: Abstraction has 11677 states and 17337 transitions. [2022-11-25 17:02:49,305 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 4.115384615384615) internal successors, (107), 26 states have internal predecessors, (107), 7 states have call successors, (21), 5 states have call predecessors, (21), 4 states have return successors, (20), 6 states have call predecessors, (20), 6 states have call successors, (20) [2022-11-25 17:02:49,305 INFO L276 IsEmpty]: Start isEmpty. Operand 11677 states and 17337 transitions. [2022-11-25 17:02:49,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2022-11-25 17:02:49,308 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 17:02:49,308 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 17:02:49,315 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2022-11-25 17:02:49,513 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2022-11-25 17:02:49,513 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 17:02:49,514 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 17:02:49,514 INFO L85 PathProgramCache]: Analyzing trace with hash -792698158, now seen corresponding path program 2 times [2022-11-25 17:02:49,514 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-25 17:02:49,514 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [799528549] [2022-11-25 17:02:49,514 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 17:02:49,515 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 17:02:49,530 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 17:02:49,530 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1776362233] [2022-11-25 17:02:49,530 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-25 17:02:49,530 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 17:02:49,531 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 [2022-11-25 17:02:49,532 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 17:02:49,550 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a32c0683-75fa-4f1e-b98b-18be6323140f/bin/uautomizer-ZsLfNo2U6R/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2022-11-25 17:02:49,630 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-25 17:02:49,631 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 17:02:49,633 INFO L263 TraceCheckSpWp]: Trace formula consists of 312 conjuncts, 78 conjunts are in the unsatisfiable core [2022-11-25 17:02:49,636 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 17:02:51,192 INFO L134 CoverageAnalysis]: Checked inductivity of 403 backedges. 29 proven. 61 refuted. 0 times theorem prover too weak. 313 trivial. 0 not checked. [2022-11-25 17:02:51,192 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 17:02:56,720 INFO L134 CoverageAnalysis]: Checked inductivity of 403 backedges. 26 proven. 61 refuted. 0 times theorem prover too weak. 316 trivial. 0 not checked. [2022-11-25 17:02:56,720 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-25 17:02:56,721 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [799528549] [2022-11-25 17:02:56,721 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 17:02:56,721 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1776362233] [2022-11-25 17:02:56,721 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1776362233] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 17:02:56,721 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-25 17:02:56,721 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 15] total 31 [2022-11-25 17:02:56,721 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1252225028] [2022-11-25 17:02:56,721 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-25 17:02:56,722 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-11-25 17:02:56,722 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-25 17:02:56,723 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-11-25 17:02:56,723 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=788, Unknown=0, NotChecked=0, Total=930 [2022-11-25 17:02:56,724 INFO L87 Difference]: Start difference. First operand 11677 states and 17337 transitions. Second operand has 31 states, 31 states have (on average 2.838709677419355) internal successors, (88), 28 states have internal predecessors, (88), 9 states have call successors, (30), 3 states have call predecessors, (30), 2 states have return successors, (29), 10 states have call predecessors, (29), 9 states have call successors, (29) [2022-11-25 17:03:19,082 WARN L233 SmtUtils]: Spent 6.81s on a formula simplification. DAG size of input: 101 DAG size of output: 90 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-25 17:03:46,022 WARN L233 SmtUtils]: Spent 11.41s on a formula simplification. DAG size of input: 100 DAG size of output: 86 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-25 17:04:00,046 WARN L233 SmtUtils]: Spent 6.55s on a formula simplification. DAG size of input: 96 DAG size of output: 76 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-25 17:04:07,137 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.07s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 17:04:17,626 WARN L233 SmtUtils]: Spent 5.15s on a formula simplification. DAG size of input: 82 DAG size of output: 71 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-25 17:04:24,696 WARN L233 SmtUtils]: Spent 6.68s on a formula simplification. DAG size of input: 103 DAG size of output: 92 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-25 17:04:50,631 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 17:05:07,810 WARN L233 SmtUtils]: Spent 10.43s on a formula simplification. DAG size of input: 108 DAG size of output: 97 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-25 17:05:10,540 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 17:05:13,579 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.33s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 17:05:25,417 WARN L233 SmtUtils]: Spent 9.31s on a formula simplification. DAG size of input: 102 DAG size of output: 82 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-25 17:05:36,262 WARN L233 SmtUtils]: Spent 10.07s on a formula simplification. DAG size of input: 90 DAG size of output: 70 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate)