./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound5.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 63182f13 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/config/AutomizerReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound5.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y --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 1aca3c96522e618238f11f200c96e0ec490e756d4e04895bd2a51f9a4ff85af1 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-63182f1 [2021-11-13 18:27:59,868 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-13 18:27:59,872 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-13 18:27:59,947 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-13 18:27:59,948 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-13 18:27:59,954 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-13 18:27:59,957 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-13 18:27:59,962 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-13 18:27:59,966 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-13 18:27:59,973 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-13 18:27:59,975 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-13 18:27:59,977 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-13 18:27:59,978 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-13 18:27:59,982 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-13 18:27:59,985 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-13 18:27:59,992 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-13 18:27:59,994 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-13 18:27:59,996 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-13 18:28:00,000 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-13 18:28:00,010 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-13 18:28:00,013 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-13 18:28:00,015 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-13 18:28:00,020 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-13 18:28:00,021 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-13 18:28:00,033 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-13 18:28:00,034 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-13 18:28:00,034 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-13 18:28:00,037 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-13 18:28:00,038 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-13 18:28:00,040 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-13 18:28:00,040 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-13 18:28:00,042 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-13 18:28:00,045 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-13 18:28:00,046 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-13 18:28:00,048 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-13 18:28:00,049 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-13 18:28:00,050 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-13 18:28:00,051 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-13 18:28:00,051 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-13 18:28:00,053 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-13 18:28:00,054 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-13 18:28:00,055 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-11-13 18:28:00,114 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-13 18:28:00,115 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-13 18:28:00,116 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-13 18:28:00,117 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-13 18:28:00,118 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-13 18:28:00,118 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-13 18:28:00,120 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-13 18:28:00,120 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-13 18:28:00,121 INFO L138 SettingsManager]: * Use SBE=true [2021-11-13 18:28:00,121 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-13 18:28:00,123 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-13 18:28:00,123 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-13 18:28:00,124 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-13 18:28:00,124 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-13 18:28:00,125 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-13 18:28:00,125 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-13 18:28:00,125 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-13 18:28:00,125 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-13 18:28:00,126 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-13 18:28:00,126 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-13 18:28:00,126 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-13 18:28:00,127 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-13 18:28:00,127 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-13 18:28:00,127 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-13 18:28:00,128 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-13 18:28:00,128 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-13 18:28:00,129 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-13 18:28:00,129 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-13 18:28:00,129 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-11-13 18:28:00,130 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-13 18:28:00,130 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-11-13 18:28:00,130 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-11-13 18:28:00,131 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-13 18:28:00,131 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-13 18:28:00,131 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 1aca3c96522e618238f11f200c96e0ec490e756d4e04895bd2a51f9a4ff85af1 [2021-11-13 18:28:00,540 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-13 18:28:00,579 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-13 18:28:00,583 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-13 18:28:00,584 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-13 18:28:00,585 INFO L275 PluginConnector]: CDTParser initialized [2021-11-13 18:28:00,588 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/../../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound5.c [2021-11-13 18:28:00,674 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/data/51a7ca259/745ac90df08c45caa8c6997677cfb75d/FLAG46d33aeda [2021-11-13 18:28:01,279 INFO L306 CDTParser]: Found 1 translation units. [2021-11-13 18:28:01,281 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound5.c [2021-11-13 18:28:01,293 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/data/51a7ca259/745ac90df08c45caa8c6997677cfb75d/FLAG46d33aeda [2021-11-13 18:28:01,603 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/data/51a7ca259/745ac90df08c45caa8c6997677cfb75d [2021-11-13 18:28:01,605 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-13 18:28:01,607 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-13 18:28:01,609 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-13 18:28:01,610 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-13 18:28:01,627 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-13 18:28:01,627 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.11 06:28:01" (1/1) ... [2021-11-13 18:28:01,629 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2b3a9d25 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:28:01, skipping insertion in model container [2021-11-13 18:28:01,629 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.11 06:28:01" (1/1) ... [2021-11-13 18:28:01,638 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-13 18:28:01,660 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-13 18:28:01,869 WARN L228 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_41b52939-7bac-4a25-86da-86a159d2d9eb/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound5.c[490,503] [2021-11-13 18:28:01,890 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-13 18:28:01,899 INFO L203 MainTranslator]: Completed pre-run [2021-11-13 18:28:01,913 WARN L228 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_41b52939-7bac-4a25-86da-86a159d2d9eb/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound5.c[490,503] [2021-11-13 18:28:01,925 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-13 18:28:01,943 INFO L208 MainTranslator]: Completed translation [2021-11-13 18:28:01,946 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:28:01 WrapperNode [2021-11-13 18:28:01,946 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-13 18:28:01,948 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-13 18:28:01,948 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-13 18:28:01,949 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-13 18:28:01,957 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:28:01" (1/1) ... [2021-11-13 18:28:01,964 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:28:01" (1/1) ... [2021-11-13 18:28:01,994 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-13 18:28:01,995 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-13 18:28:01,995 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-13 18:28:01,995 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-13 18:28:02,008 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:28:01" (1/1) ... [2021-11-13 18:28:02,008 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:28:01" (1/1) ... [2021-11-13 18:28:02,024 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:28:01" (1/1) ... [2021-11-13 18:28:02,027 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:28:01" (1/1) ... [2021-11-13 18:28:02,033 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:28:01" (1/1) ... [2021-11-13 18:28:02,038 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:28:01" (1/1) ... [2021-11-13 18:28:02,040 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:28:01" (1/1) ... [2021-11-13 18:28:02,043 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-13 18:28:02,045 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-13 18:28:02,045 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-13 18:28:02,045 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-13 18:28:02,046 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:28:01" (1/1) ... [2021-11-13 18:28:02,056 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-13 18:28:02,068 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:28:02,081 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-13 18:28:02,094 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-13 18:28:02,138 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-11-13 18:28:02,139 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-11-13 18:28:02,139 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-13 18:28:02,139 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-13 18:28:02,139 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-13 18:28:02,139 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-13 18:28:02,140 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-11-13 18:28:02,140 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-11-13 18:28:02,410 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-13 18:28:02,410 INFO L299 CfgBuilder]: Removed 3 assume(true) statements. [2021-11-13 18:28:02,413 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.11 06:28:02 BoogieIcfgContainer [2021-11-13 18:28:02,416 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-13 18:28:02,419 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-13 18:28:02,421 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-13 18:28:02,426 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-13 18:28:02,426 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 13.11 06:28:01" (1/3) ... [2021-11-13 18:28:02,427 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4dadbc17 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.11 06:28:02, skipping insertion in model container [2021-11-13 18:28:02,427 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:28:01" (2/3) ... [2021-11-13 18:28:02,428 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4dadbc17 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.11 06:28:02, skipping insertion in model container [2021-11-13 18:28:02,428 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.11 06:28:02" (3/3) ... [2021-11-13 18:28:02,429 INFO L111 eAbstractionObserver]: Analyzing ICFG egcd3-ll_valuebound5.c [2021-11-13 18:28:02,436 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-13 18:28:02,436 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-13 18:28:02,495 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-13 18:28:02,504 INFO L339 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, mLoopAccelerationTechnique=FAST_UPR [2021-11-13 18:28:02,505 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-13 18:28:02,527 INFO L276 IsEmpty]: Start isEmpty. Operand has 35 states, 22 states have (on average 1.5454545454545454) internal successors, (34), 23 states have internal predecessors, (34), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-11-13 18:28:02,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-13 18:28:02,535 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:28:02,536 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:28:02,537 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:28:02,544 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:28:02,545 INFO L85 PathProgramCache]: Analyzing trace with hash 872320404, now seen corresponding path program 1 times [2021-11-13 18:28:02,557 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:28:02,558 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1018411779] [2021-11-13 18:28:02,559 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:28:02,560 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:28:02,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:28:02,756 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-11-13 18:28:02,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:28:02,769 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-11-13 18:28:02,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:28:02,796 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2021-11-13 18:28:02,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:28:02,806 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-11-13 18:28:02,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:28:02,831 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-13 18:28:02,832 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:28:02,832 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1018411779] [2021-11-13 18:28:02,834 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1018411779] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 18:28:02,834 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 18:28:02,835 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-13 18:28:02,837 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [446437428] [2021-11-13 18:28:02,838 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 18:28:02,844 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-13 18:28:02,859 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:28:02,909 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-13 18:28:02,910 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-13 18:28:02,913 INFO L87 Difference]: Start difference. First operand has 35 states, 22 states have (on average 1.5454545454545454) internal successors, (34), 23 states have internal predecessors, (34), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) Second operand has 2 states, 2 states have (on average 5.5) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-13 18:28:02,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:28:02,969 INFO L93 Difference]: Finished difference Result 67 states and 109 transitions. [2021-11-13 18:28:02,970 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-13 18:28:02,972 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 5.5) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 2 states have call successors, (4) Word has length 29 [2021-11-13 18:28:02,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:28:02,983 INFO L225 Difference]: With dead ends: 67 [2021-11-13 18:28:02,999 INFO L226 Difference]: Without dead ends: 31 [2021-11-13 18:28:03,003 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-13 18:28:03,009 INFO L933 BasicCegarLoop]: 44 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.00ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.45ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.00ms IncrementalHoareTripleChecker+Time [2021-11-13 18:28:03,010 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 1.45ms Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.00ms Time] [2021-11-13 18:28:03,064 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-11-13 18:28:03,105 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2021-11-13 18:28:03,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 19 states have (on average 1.2105263157894737) internal successors, (23), 20 states have internal predecessors, (23), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-13 18:28:03,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 40 transitions. [2021-11-13 18:28:03,115 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 40 transitions. Word has length 29 [2021-11-13 18:28:03,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:28:03,116 INFO L470 AbstractCegarLoop]: Abstraction has 31 states and 40 transitions. [2021-11-13 18:28:03,117 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 5.5) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-13 18:28:03,117 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 40 transitions. [2021-11-13 18:28:03,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-13 18:28:03,123 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:28:03,123 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:28:03,124 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-13 18:28:03,125 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:28:03,128 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:28:03,129 INFO L85 PathProgramCache]: Analyzing trace with hash 1714405113, now seen corresponding path program 1 times [2021-11-13 18:28:03,129 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:28:03,130 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1298684983] [2021-11-13 18:28:03,130 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:28:03,131 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:28:03,188 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 18:28:03,189 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1279201453] [2021-11-13 18:28:03,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:28:03,189 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:28:03,189 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:28:03,192 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:28:03,211 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-13 18:28:03,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:28:03,310 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-13 18:28:03,319 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:28:03,534 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-13 18:28:03,534 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-13 18:28:03,535 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:28:03,535 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1298684983] [2021-11-13 18:28:03,535 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 18:28:03,539 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1279201453] [2021-11-13 18:28:03,541 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1279201453] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 18:28:03,544 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 18:28:03,545 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-13 18:28:03,546 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [949850750] [2021-11-13 18:28:03,550 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 18:28:03,551 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-13 18:28:03,553 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:28:03,555 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-13 18:28:03,558 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-13 18:28:03,559 INFO L87 Difference]: Start difference. First operand 31 states and 40 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, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-13 18:28:03,719 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:28:03,720 INFO L93 Difference]: Finished difference Result 50 states and 65 transitions. [2021-11-13 18:28:03,722 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-13 18:28:03,723 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, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) Word has length 30 [2021-11-13 18:28:03,724 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:28:03,727 INFO L225 Difference]: With dead ends: 50 [2021-11-13 18:28:03,727 INFO L226 Difference]: Without dead ends: 43 [2021-11-13 18:28:03,730 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-11-13 18:28:03,733 INFO L933 BasicCegarLoop]: 34 mSDtfsCounter, 31 mSDsluCounter, 101 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 75.38ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 135 SdHoareTripleChecker+Invalid, 63 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 6.16ms SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 54 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 105.04ms IncrementalHoareTripleChecker+Time [2021-11-13 18:28:03,736 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [35 Valid, 135 Invalid, 63 Unknown, 0 Unchecked, 6.16ms Time], IncrementalHoareTripleChecker [9 Valid, 54 Invalid, 0 Unknown, 0 Unchecked, 105.04ms Time] [2021-11-13 18:28:03,741 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-11-13 18:28:03,758 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 33. [2021-11-13 18:28:03,764 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 21 states have (on average 1.1904761904761905) internal successors, (25), 22 states have internal predecessors, (25), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-13 18:28:03,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 42 transitions. [2021-11-13 18:28:03,772 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 42 transitions. Word has length 30 [2021-11-13 18:28:03,773 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:28:03,773 INFO L470 AbstractCegarLoop]: Abstraction has 33 states and 42 transitions. [2021-11-13 18:28:03,774 INFO L471 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, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-13 18:28:03,775 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 42 transitions. [2021-11-13 18:28:03,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-13 18:28:03,778 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:28:03,779 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:28:03,829 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-13 18:28:04,002 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:28:04,003 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:28:04,003 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:28:04,003 INFO L85 PathProgramCache]: Analyzing trace with hash -1825736765, now seen corresponding path program 1 times [2021-11-13 18:28:04,004 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:28:04,004 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1620812928] [2021-11-13 18:28:04,004 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:28:04,005 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:28:04,054 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 18:28:04,055 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [951914138] [2021-11-13 18:28:04,055 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:28:04,056 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:28:04,056 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:28:04,057 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:28:04,095 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-13 18:28:04,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:28:04,178 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-13 18:28:04,181 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:28:04,645 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 9 proven. 3 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-13 18:28:04,646 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:28:04,872 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-13 18:28:04,872 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:28:04,873 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1620812928] [2021-11-13 18:28:04,873 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 18:28:04,873 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [951914138] [2021-11-13 18:28:04,874 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [951914138] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-13 18:28:04,874 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-13 18:28:04,874 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [9] total 10 [2021-11-13 18:28:04,874 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [364940513] [2021-11-13 18:28:04,875 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 18:28:04,875 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-13 18:28:04,875 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:28:04,876 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-13 18:28:04,876 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-11-13 18:28:04,877 INFO L87 Difference]: Start difference. First operand 33 states and 42 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-13 18:28:04,955 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:28:04,955 INFO L93 Difference]: Finished difference Result 49 states and 63 transitions. [2021-11-13 18:28:04,955 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-13 18:28:04,956 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 33 [2021-11-13 18:28:04,958 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:28:04,962 INFO L225 Difference]: With dead ends: 49 [2021-11-13 18:28:04,962 INFO L226 Difference]: Without dead ends: 47 [2021-11-13 18:28:04,963 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 55 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-11-13 18:28:04,967 INFO L933 BasicCegarLoop]: 39 mSDtfsCounter, 9 mSDsluCounter, 106 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 32.02ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 145 SdHoareTripleChecker+Invalid, 26 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.86ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 48.42ms IncrementalHoareTripleChecker+Time [2021-11-13 18:28:04,969 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 145 Invalid, 26 Unknown, 0 Unchecked, 3.86ms Time], IncrementalHoareTripleChecker [0 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 48.42ms Time] [2021-11-13 18:28:04,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-11-13 18:28:04,999 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 46. [2021-11-13 18:28:05,000 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 29 states have (on average 1.206896551724138) internal successors, (35), 30 states have internal predecessors, (35), 13 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-11-13 18:28:05,006 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 60 transitions. [2021-11-13 18:28:05,007 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 60 transitions. Word has length 33 [2021-11-13 18:28:05,007 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:28:05,007 INFO L470 AbstractCegarLoop]: Abstraction has 46 states and 60 transitions. [2021-11-13 18:28:05,008 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-13 18:28:05,008 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 60 transitions. [2021-11-13 18:28:05,009 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-13 18:28:05,010 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:28:05,010 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:28:05,051 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-13 18:28:05,231 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:28:05,232 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:28:05,232 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:28:05,232 INFO L85 PathProgramCache]: Analyzing trace with hash -1547103247, now seen corresponding path program 1 times [2021-11-13 18:28:05,233 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:28:05,233 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1705591430] [2021-11-13 18:28:05,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:28:05,233 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:28:05,257 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 18:28:05,257 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1755196617] [2021-11-13 18:28:05,258 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:28:05,258 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:28:05,258 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:28:05,274 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:28:05,307 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-13 18:28:05,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:28:05,352 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-13 18:28:05,355 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:28:05,483 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 6 proven. 5 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-13 18:28:05,483 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:28:05,626 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 6 proven. 5 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-13 18:28:05,627 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:28:05,627 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1705591430] [2021-11-13 18:28:05,627 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 18:28:05,627 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1755196617] [2021-11-13 18:28:05,628 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1755196617] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 18:28:05,629 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-13 18:28:05,629 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2021-11-13 18:28:05,629 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1809485902] [2021-11-13 18:28:05,629 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-13 18:28:05,632 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-13 18:28:05,632 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:28:05,633 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-13 18:28:05,633 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-11-13 18:28:05,634 INFO L87 Difference]: Start difference. First operand 46 states and 60 transitions. Second operand has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-13 18:28:05,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:28:05,874 INFO L93 Difference]: Finished difference Result 99 states and 139 transitions. [2021-11-13 18:28:05,875 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-13 18:28:05,875 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 3 states have call successors, (5), 2 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 35 [2021-11-13 18:28:05,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:28:05,880 INFO L225 Difference]: With dead ends: 99 [2021-11-13 18:28:05,881 INFO L226 Difference]: Without dead ends: 92 [2021-11-13 18:28:05,882 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 60 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=47, Invalid=135, Unknown=0, NotChecked=0, Total=182 [2021-11-13 18:28:05,885 INFO L933 BasicCegarLoop]: 48 mSDtfsCounter, 60 mSDsluCounter, 176 mSDsCounter, 0 mSdLazyCounter, 88 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 99.53ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 64 SdHoareTripleChecker+Valid, 224 SdHoareTripleChecker+Invalid, 134 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 8.06ms SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 88 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 123.56ms IncrementalHoareTripleChecker+Time [2021-11-13 18:28:05,887 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [64 Valid, 224 Invalid, 134 Unknown, 0 Unchecked, 8.06ms Time], IncrementalHoareTripleChecker [46 Valid, 88 Invalid, 0 Unknown, 0 Unchecked, 123.56ms Time] [2021-11-13 18:28:05,889 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2021-11-13 18:28:05,913 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 67. [2021-11-13 18:28:05,913 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 46 states have (on average 1.2608695652173914) internal successors, (58), 47 states have internal predecessors, (58), 17 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2021-11-13 18:28:05,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 91 transitions. [2021-11-13 18:28:05,924 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 91 transitions. Word has length 35 [2021-11-13 18:28:05,924 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:28:05,925 INFO L470 AbstractCegarLoop]: Abstraction has 67 states and 91 transitions. [2021-11-13 18:28:05,925 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-13 18:28:05,926 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 91 transitions. [2021-11-13 18:28:05,929 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-11-13 18:28:05,930 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:28:05,930 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 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] [2021-11-13 18:28:05,978 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-13 18:28:06,143 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:28:06,143 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:28:06,144 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:28:06,144 INFO L85 PathProgramCache]: Analyzing trace with hash -720434099, now seen corresponding path program 1 times [2021-11-13 18:28:06,144 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:28:06,144 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [912159007] [2021-11-13 18:28:06,145 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:28:06,145 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:28:06,163 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 18:28:06,164 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1500818539] [2021-11-13 18:28:06,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:28:06,164 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:28:06,164 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:28:06,165 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:28:06,183 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-13 18:28:06,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:28:06,236 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-13 18:28:06,238 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:28:06,827 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 2 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-13 18:28:06,827 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:28:07,112 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-13 18:28:07,113 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:28:07,113 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [912159007] [2021-11-13 18:28:07,113 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 18:28:07,113 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1500818539] [2021-11-13 18:28:07,113 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1500818539] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-13 18:28:07,114 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-13 18:28:07,114 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [11] total 14 [2021-11-13 18:28:07,114 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [154754260] [2021-11-13 18:28:07,114 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 18:28:07,115 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-13 18:28:07,116 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:28:07,116 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-13 18:28:07,116 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=139, Unknown=0, NotChecked=0, Total=182 [2021-11-13 18:28:07,117 INFO L87 Difference]: Start difference. First operand 67 states and 91 transitions. Second operand has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 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) [2021-11-13 18:28:07,224 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:28:07,224 INFO L93 Difference]: Finished difference Result 75 states and 98 transitions. [2021-11-13 18:28:07,225 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-13 18:28:07,225 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 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 38 [2021-11-13 18:28:07,228 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:28:07,231 INFO L225 Difference]: With dead ends: 75 [2021-11-13 18:28:07,231 INFO L226 Difference]: Without dead ends: 73 [2021-11-13 18:28:07,232 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 61 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=47, Invalid=163, Unknown=0, NotChecked=0, Total=210 [2021-11-13 18:28:07,233 INFO L933 BasicCegarLoop]: 40 mSDtfsCounter, 16 mSDsluCounter, 165 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 54.10ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 205 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 6.50ms SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 54 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 68.64ms IncrementalHoareTripleChecker+Time [2021-11-13 18:28:07,234 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 205 Invalid, 59 Unknown, 0 Unchecked, 6.50ms Time], IncrementalHoareTripleChecker [5 Valid, 54 Invalid, 0 Unknown, 0 Unchecked, 68.64ms Time] [2021-11-13 18:28:07,236 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2021-11-13 18:28:07,261 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 71. [2021-11-13 18:28:07,261 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 49 states have (on average 1.2448979591836735) internal successors, (61), 50 states have internal predecessors, (61), 17 states have call successors, (17), 4 states have call predecessors, (17), 4 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2021-11-13 18:28:07,272 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 94 transitions. [2021-11-13 18:28:07,272 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 94 transitions. Word has length 38 [2021-11-13 18:28:07,273 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:28:07,273 INFO L470 AbstractCegarLoop]: Abstraction has 71 states and 94 transitions. [2021-11-13 18:28:07,274 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 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) [2021-11-13 18:28:07,274 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 94 transitions. [2021-11-13 18:28:07,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-11-13 18:28:07,278 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:28:07,279 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:28:07,316 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-13 18:28:07,495 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:28:07,495 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:28:07,496 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:28:07,496 INFO L85 PathProgramCache]: Analyzing trace with hash -376152117, now seen corresponding path program 1 times [2021-11-13 18:28:07,496 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:28:07,496 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2118983176] [2021-11-13 18:28:07,496 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:28:07,496 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:28:07,514 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 18:28:07,514 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1135257611] [2021-11-13 18:28:07,515 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:28:07,515 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:28:07,515 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:28:07,516 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:28:07,534 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-13 18:28:07,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:28:07,588 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-13 18:28:07,591 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:28:07,855 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-13 18:28:07,855 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:28:08,231 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-13 18:28:08,231 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:28:08,232 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2118983176] [2021-11-13 18:28:08,232 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 18:28:08,232 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1135257611] [2021-11-13 18:28:08,232 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1135257611] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 18:28:08,232 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-13 18:28:08,232 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 8 [2021-11-13 18:28:08,233 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [757942612] [2021-11-13 18:28:08,233 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-13 18:28:08,235 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-13 18:28:08,235 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:28:08,236 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-13 18:28:08,236 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-11-13 18:28:08,236 INFO L87 Difference]: Start difference. First operand 71 states and 94 transitions. Second operand has 8 states, 8 states have (on average 3.875) internal successors, (31), 7 states have internal predecessors, (31), 3 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-13 18:28:08,325 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:28:08,325 INFO L93 Difference]: Finished difference Result 95 states and 125 transitions. [2021-11-13 18:28:08,326 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-13 18:28:08,326 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.875) internal successors, (31), 7 states have internal predecessors, (31), 3 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 38 [2021-11-13 18:28:08,326 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:28:08,330 INFO L225 Difference]: With dead ends: 95 [2021-11-13 18:28:08,330 INFO L226 Difference]: Without dead ends: 93 [2021-11-13 18:28:08,331 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 67 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-11-13 18:28:08,332 INFO L933 BasicCegarLoop]: 53 mSDtfsCounter, 13 mSDsluCounter, 209 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 42.97ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 262 SdHoareTripleChecker+Invalid, 71 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.96ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 26 IncrementalHoareTripleChecker+Unchecked, 55.46ms IncrementalHoareTripleChecker+Time [2021-11-13 18:28:08,332 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 262 Invalid, 71 Unknown, 0 Unchecked, 4.96ms Time], IncrementalHoareTripleChecker [0 Valid, 45 Invalid, 0 Unknown, 26 Unchecked, 55.46ms Time] [2021-11-13 18:28:08,333 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-11-13 18:28:08,348 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 89. [2021-11-13 18:28:08,349 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 62 states have (on average 1.2419354838709677) internal successors, (77), 63 states have internal predecessors, (77), 21 states have call successors, (21), 5 states have call predecessors, (21), 5 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2021-11-13 18:28:08,351 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 118 transitions. [2021-11-13 18:28:08,351 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 118 transitions. Word has length 38 [2021-11-13 18:28:08,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:28:08,352 INFO L470 AbstractCegarLoop]: Abstraction has 89 states and 118 transitions. [2021-11-13 18:28:08,352 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 3.875) internal successors, (31), 7 states have internal predecessors, (31), 3 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-13 18:28:08,352 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 118 transitions. [2021-11-13 18:28:08,353 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-13 18:28:08,354 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:28:08,354 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 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] [2021-11-13 18:28:08,402 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-13 18:28:08,567 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:28:08,568 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:28:08,568 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:28:08,570 INFO L85 PathProgramCache]: Analyzing trace with hash 279172547, now seen corresponding path program 1 times [2021-11-13 18:28:08,570 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:28:08,570 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [952363950] [2021-11-13 18:28:08,571 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:28:08,571 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:28:08,591 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 18:28:08,592 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1634883001] [2021-11-13 18:28:08,592 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:28:08,592 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:28:08,592 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:28:08,593 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:28:08,619 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-13 18:28:08,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:28:08,668 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-13 18:28:08,671 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:28:08,947 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-13 18:28:08,947 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:28:09,105 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-13 18:28:09,106 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:28:09,106 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [952363950] [2021-11-13 18:28:09,106 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 18:28:09,107 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1634883001] [2021-11-13 18:28:09,107 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1634883001] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-13 18:28:09,107 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-13 18:28:09,107 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [9] total 10 [2021-11-13 18:28:09,108 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [707134077] [2021-11-13 18:28:09,108 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 18:28:09,108 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-13 18:28:09,109 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:28:09,109 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-13 18:28:09,109 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2021-11-13 18:28:09,110 INFO L87 Difference]: Start difference. First operand 89 states and 118 transitions. Second operand has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-13 18:28:09,196 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:28:09,196 INFO L93 Difference]: Finished difference Result 126 states and 175 transitions. [2021-11-13 18:28:09,197 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-13 18:28:09,197 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 43 [2021-11-13 18:28:09,198 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:28:09,201 INFO L225 Difference]: With dead ends: 126 [2021-11-13 18:28:09,201 INFO L226 Difference]: Without dead ends: 124 [2021-11-13 18:28:09,202 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 75 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2021-11-13 18:28:09,203 INFO L933 BasicCegarLoop]: 38 mSDtfsCounter, 8 mSDsluCounter, 96 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 42.95ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 134 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.03ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 55.55ms IncrementalHoareTripleChecker+Time [2021-11-13 18:28:09,204 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 134 Invalid, 43 Unknown, 0 Unchecked, 2.03ms Time], IncrementalHoareTripleChecker [0 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 55.55ms Time] [2021-11-13 18:28:09,206 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2021-11-13 18:28:09,248 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 119. [2021-11-13 18:28:09,248 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 75 states have (on average 1.2666666666666666) internal successors, (95), 76 states have internal predecessors, (95), 37 states have call successors, (37), 6 states have call predecessors, (37), 6 states have return successors, (36), 36 states have call predecessors, (36), 36 states have call successors, (36) [2021-11-13 18:28:09,256 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 168 transitions. [2021-11-13 18:28:09,256 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 168 transitions. Word has length 43 [2021-11-13 18:28:09,259 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:28:09,259 INFO L470 AbstractCegarLoop]: Abstraction has 119 states and 168 transitions. [2021-11-13 18:28:09,259 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-13 18:28:09,259 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 168 transitions. [2021-11-13 18:28:09,266 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-13 18:28:09,266 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:28:09,266 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 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] [2021-11-13 18:28:09,299 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-13 18:28:09,475 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-11-13 18:28:09,475 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:28:09,476 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:28:09,476 INFO L85 PathProgramCache]: Analyzing trace with hash -2141198011, now seen corresponding path program 1 times [2021-11-13 18:28:09,476 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:28:09,476 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [646981774] [2021-11-13 18:28:09,476 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:28:09,476 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:28:09,494 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 18:28:09,494 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [497173799] [2021-11-13 18:28:09,495 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:28:09,495 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:28:09,495 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:28:09,496 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:28:09,531 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-13 18:28:09,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:28:09,581 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 44 conjunts are in the unsatisfiable core [2021-11-13 18:28:09,584 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:28:10,378 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 8 proven. 10 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-13 18:28:10,378 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:28:10,706 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-13 18:28:10,707 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:28:10,707 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [646981774] [2021-11-13 18:28:10,707 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 18:28:10,707 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [497173799] [2021-11-13 18:28:10,707 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [497173799] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 18:28:10,707 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-13 18:28:10,708 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 8] total 17 [2021-11-13 18:28:10,708 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1337423684] [2021-11-13 18:28:10,708 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-13 18:28:10,709 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-13 18:28:10,709 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:28:10,709 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-13 18:28:10,710 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=216, Unknown=0, NotChecked=0, Total=272 [2021-11-13 18:28:10,710 INFO L87 Difference]: Start difference. First operand 119 states and 168 transitions. Second operand has 17 states, 16 states have (on average 2.3125) internal successors, (37), 14 states have internal predecessors, (37), 5 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (9), 5 states have call predecessors, (9), 5 states have call successors, (9) [2021-11-13 18:28:14,898 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:28:14,898 INFO L93 Difference]: Finished difference Result 243 states and 354 transitions. [2021-11-13 18:28:14,901 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-13 18:28:14,902 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 2.3125) internal successors, (37), 14 states have internal predecessors, (37), 5 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (9), 5 states have call predecessors, (9), 5 states have call successors, (9) Word has length 43 [2021-11-13 18:28:14,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:28:14,906 INFO L225 Difference]: With dead ends: 243 [2021-11-13 18:28:14,906 INFO L226 Difference]: Without dead ends: 241 [2021-11-13 18:28:14,908 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 68 SyntacticMatches, 1 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 237 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=248, Invalid=808, Unknown=0, NotChecked=0, Total=1056 [2021-11-13 18:28:14,909 INFO L933 BasicCegarLoop]: 48 mSDtfsCounter, 219 mSDsluCounter, 283 mSDsCounter, 0 mSdLazyCounter, 423 mSolverCounterSat, 201 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2284.06ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 220 SdHoareTripleChecker+Valid, 331 SdHoareTripleChecker+Invalid, 624 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 12.78ms SdHoareTripleChecker+Time, 201 IncrementalHoareTripleChecker+Valid, 423 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2412.31ms IncrementalHoareTripleChecker+Time [2021-11-13 18:28:14,909 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [220 Valid, 331 Invalid, 624 Unknown, 0 Unchecked, 12.78ms Time], IncrementalHoareTripleChecker [201 Valid, 423 Invalid, 0 Unknown, 0 Unchecked, 2412.31ms Time] [2021-11-13 18:28:14,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 241 states. [2021-11-13 18:28:14,991 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 241 to 187. [2021-11-13 18:28:14,992 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 187 states, 125 states have (on average 1.28) internal successors, (160), 126 states have internal predecessors, (160), 53 states have call successors, (53), 8 states have call predecessors, (53), 8 states have return successors, (52), 52 states have call predecessors, (52), 52 states have call successors, (52) [2021-11-13 18:28:14,997 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 265 transitions. [2021-11-13 18:28:14,997 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 265 transitions. Word has length 43 [2021-11-13 18:28:14,997 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:28:14,998 INFO L470 AbstractCegarLoop]: Abstraction has 187 states and 265 transitions. [2021-11-13 18:28:14,998 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 2.3125) internal successors, (37), 14 states have internal predecessors, (37), 5 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (9), 5 states have call predecessors, (9), 5 states have call successors, (9) [2021-11-13 18:28:14,998 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 265 transitions. [2021-11-13 18:28:15,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-13 18:28:15,002 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:28:15,002 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:28:15,044 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-13 18:28:15,231 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:28:15,231 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:28:15,232 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:28:15,232 INFO L85 PathProgramCache]: Analyzing trace with hash -1796916029, now seen corresponding path program 2 times [2021-11-13 18:28:15,232 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:28:15,232 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [528176384] [2021-11-13 18:28:15,232 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:28:15,232 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:28:15,248 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 18:28:15,248 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [178037161] [2021-11-13 18:28:15,249 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-13 18:28:15,249 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:28:15,249 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:28:15,267 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:28:15,287 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-13 18:28:15,337 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-13 18:28:15,337 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 18:28:15,338 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-13 18:28:15,341 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:28:15,448 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-13 18:28:15,449 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-13 18:28:15,449 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:28:15,449 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [528176384] [2021-11-13 18:28:15,450 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 18:28:15,450 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [178037161] [2021-11-13 18:28:15,450 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [178037161] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 18:28:15,450 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 18:28:15,451 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-13 18:28:15,451 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [577946197] [2021-11-13 18:28:15,451 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 18:28:15,452 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-13 18:28:15,452 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:28:15,453 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-13 18:28:15,453 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-13 18:28:15,453 INFO L87 Difference]: Start difference. First operand 187 states and 265 transitions. Second operand has 5 states, 5 states have (on average 5.0) internal successors, (25), 5 states have internal predecessors, (25), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-13 18:28:15,570 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:28:15,570 INFO L93 Difference]: Finished difference Result 234 states and 326 transitions. [2021-11-13 18:28:15,570 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-13 18:28:15,571 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 5.0) internal successors, (25), 5 states have internal predecessors, (25), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 43 [2021-11-13 18:28:15,571 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:28:15,574 INFO L225 Difference]: With dead ends: 234 [2021-11-13 18:28:15,574 INFO L226 Difference]: Without dead ends: 114 [2021-11-13 18:28:15,580 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-13 18:28:15,583 INFO L933 BasicCegarLoop]: 53 mSDtfsCounter, 18 mSDsluCounter, 111 mSDsCounter, 0 mSdLazyCounter, 57 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 49.49ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 164 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.76ms SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 57 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 61.92ms IncrementalHoareTripleChecker+Time [2021-11-13 18:28:15,584 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 164 Invalid, 66 Unknown, 0 Unchecked, 3.76ms Time], IncrementalHoareTripleChecker [9 Valid, 57 Invalid, 0 Unknown, 0 Unchecked, 61.92ms Time] [2021-11-13 18:28:15,585 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2021-11-13 18:28:15,607 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 102. [2021-11-13 18:28:15,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 102 states, 64 states have (on average 1.1875) internal successors, (76), 65 states have internal predecessors, (76), 29 states have call successors, (29), 8 states have call predecessors, (29), 8 states have return successors, (28), 28 states have call predecessors, (28), 28 states have call successors, (28) [2021-11-13 18:28:15,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 133 transitions. [2021-11-13 18:28:15,610 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 133 transitions. Word has length 43 [2021-11-13 18:28:15,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:28:15,610 INFO L470 AbstractCegarLoop]: Abstraction has 102 states and 133 transitions. [2021-11-13 18:28:15,610 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 5.0) internal successors, (25), 5 states have internal predecessors, (25), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-13 18:28:15,610 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 133 transitions. [2021-11-13 18:28:15,611 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-13 18:28:15,611 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:28:15,612 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 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] [2021-11-13 18:28:15,661 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-13 18:28:15,835 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:28:15,836 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:28:15,836 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:28:15,836 INFO L85 PathProgramCache]: Analyzing trace with hash -1189241395, now seen corresponding path program 1 times [2021-11-13 18:28:15,836 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:28:15,841 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [689300875] [2021-11-13 18:28:15,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:28:15,842 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:28:15,860 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 18:28:15,860 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1030774632] [2021-11-13 18:28:15,860 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:28:15,860 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:28:15,861 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:28:15,862 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:28:15,911 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-13 18:28:15,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:28:15,948 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-13 18:28:15,951 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:28:16,116 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-13 18:28:16,117 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-13 18:28:16,117 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:28:16,117 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [689300875] [2021-11-13 18:28:16,117 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 18:28:16,118 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1030774632] [2021-11-13 18:28:16,118 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1030774632] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 18:28:16,118 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 18:28:16,118 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-13 18:28:16,119 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1939563857] [2021-11-13 18:28:16,119 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 18:28:16,121 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-13 18:28:16,121 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:28:16,122 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-13 18:28:16,122 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-13 18:28:16,123 INFO L87 Difference]: Start difference. First operand 102 states and 133 transitions. Second operand has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-13 18:28:16,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:28:16,223 INFO L93 Difference]: Finished difference Result 154 states and 217 transitions. [2021-11-13 18:28:16,224 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-13 18:28:16,224 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 48 [2021-11-13 18:28:16,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:28:16,230 INFO L225 Difference]: With dead ends: 154 [2021-11-13 18:28:16,230 INFO L226 Difference]: Without dead ends: 152 [2021-11-13 18:28:16,231 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-13 18:28:16,232 INFO L933 BasicCegarLoop]: 42 mSDtfsCounter, 9 mSDsluCounter, 104 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 37.21ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 146 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.61ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 46.84ms IncrementalHoareTripleChecker+Time [2021-11-13 18:28:16,234 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 146 Invalid, 44 Unknown, 0 Unchecked, 1.61ms Time], IncrementalHoareTripleChecker [0 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 46.84ms Time] [2021-11-13 18:28:16,235 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2021-11-13 18:28:16,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 136. [2021-11-13 18:28:16,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 73 states have (on average 1.1643835616438356) internal successors, (85), 80 states have internal predecessors, (85), 53 states have call successors, (53), 9 states have call predecessors, (53), 9 states have return successors, (52), 46 states have call predecessors, (52), 52 states have call successors, (52) [2021-11-13 18:28:16,286 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 190 transitions. [2021-11-13 18:28:16,286 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 190 transitions. Word has length 48 [2021-11-13 18:28:16,287 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:28:16,287 INFO L470 AbstractCegarLoop]: Abstraction has 136 states and 190 transitions. [2021-11-13 18:28:16,287 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-13 18:28:16,288 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 190 transitions. [2021-11-13 18:28:16,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-13 18:28:16,290 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:28:16,290 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 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, 1, 1, 1, 1] [2021-11-13 18:28:16,338 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-13 18:28:16,515 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:28:16,515 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:28:16,516 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:28:16,516 INFO L85 PathProgramCache]: Analyzing trace with hash -828341661, now seen corresponding path program 1 times [2021-11-13 18:28:16,516 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:28:16,516 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [905966726] [2021-11-13 18:28:16,516 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:28:16,516 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:28:16,534 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 18:28:16,545 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1866467898] [2021-11-13 18:28:16,546 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:28:16,546 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:28:16,546 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:28:16,547 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:28:16,583 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-13 18:28:16,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:28:16,638 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 50 conjunts are in the unsatisfiable core [2021-11-13 18:28:16,641 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:28:17,525 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 10 proven. 11 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-11-13 18:28:17,525 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:28:18,439 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 10 proven. 11 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-11-13 18:28:18,439 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:28:18,439 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [905966726] [2021-11-13 18:28:18,439 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 18:28:18,440 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1866467898] [2021-11-13 18:28:18,440 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1866467898] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 18:28:18,440 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-13 18:28:18,440 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 20 [2021-11-13 18:28:18,440 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1218450083] [2021-11-13 18:28:18,441 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-13 18:28:18,441 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-13 18:28:18,441 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:28:18,442 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-13 18:28:18,443 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=321, Unknown=0, NotChecked=0, Total=380 [2021-11-13 18:28:18,443 INFO L87 Difference]: Start difference. First operand 136 states and 190 transitions. Second operand has 20 states, 18 states have (on average 2.388888888888889) internal successors, (43), 19 states have internal predecessors, (43), 6 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2021-11-13 18:28:27,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:28:27,771 INFO L93 Difference]: Finished difference Result 273 states and 403 transitions. [2021-11-13 18:28:27,772 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-13 18:28:27,772 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 18 states have (on average 2.388888888888889) internal successors, (43), 19 states have internal predecessors, (43), 6 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 60 [2021-11-13 18:28:27,772 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:28:27,776 INFO L225 Difference]: With dead ends: 273 [2021-11-13 18:28:27,776 INFO L226 Difference]: Without dead ends: 269 [2021-11-13 18:28:27,778 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 98 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 291 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=302, Invalid=1420, Unknown=0, NotChecked=0, Total=1722 [2021-11-13 18:28:27,779 INFO L933 BasicCegarLoop]: 38 mSDtfsCounter, 140 mSDsluCounter, 381 mSDsCounter, 0 mSdLazyCounter, 989 mSolverCounterSat, 370 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7159.42ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 147 SdHoareTripleChecker+Valid, 419 SdHoareTripleChecker+Invalid, 1359 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 16.13ms SdHoareTripleChecker+Time, 370 IncrementalHoareTripleChecker+Valid, 989 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7395.57ms IncrementalHoareTripleChecker+Time [2021-11-13 18:28:27,780 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [147 Valid, 419 Invalid, 1359 Unknown, 0 Unchecked, 16.13ms Time], IncrementalHoareTripleChecker [370 Valid, 989 Invalid, 0 Unknown, 0 Unchecked, 7395.57ms Time] [2021-11-13 18:28:27,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 269 states. [2021-11-13 18:28:27,861 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 269 to 220. [2021-11-13 18:28:27,862 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 220 states, 127 states have (on average 1.204724409448819) internal successors, (153), 134 states have internal predecessors, (153), 81 states have call successors, (81), 11 states have call predecessors, (81), 11 states have return successors, (80), 74 states have call predecessors, (80), 80 states have call successors, (80) [2021-11-13 18:28:27,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 220 states to 220 states and 314 transitions. [2021-11-13 18:28:27,865 INFO L78 Accepts]: Start accepts. Automaton has 220 states and 314 transitions. Word has length 60 [2021-11-13 18:28:27,866 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:28:27,866 INFO L470 AbstractCegarLoop]: Abstraction has 220 states and 314 transitions. [2021-11-13 18:28:27,867 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 18 states have (on average 2.388888888888889) internal successors, (43), 19 states have internal predecessors, (43), 6 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2021-11-13 18:28:27,867 INFO L276 IsEmpty]: Start isEmpty. Operand 220 states and 314 transitions. [2021-11-13 18:28:27,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-13 18:28:27,868 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:28:27,869 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 4, 4, 4, 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, 1] [2021-11-13 18:28:27,912 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-13 18:28:28,091 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:28:28,091 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:28:28,092 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:28:28,092 INFO L85 PathProgramCache]: Analyzing trace with hash 1607561902, now seen corresponding path program 1 times [2021-11-13 18:28:28,092 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:28:28,092 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1958802626] [2021-11-13 18:28:28,092 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:28:28,092 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:28:28,105 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 18:28:28,112 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [328303773] [2021-11-13 18:28:28,113 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:28:28,113 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:28:28,113 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:28:28,114 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:28:28,159 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-13 18:28:28,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:28:28,205 INFO L263 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-13 18:28:28,208 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:28:28,949 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 14 proven. 17 refuted. 0 times theorem prover too weak. 96 trivial. 0 not checked. [2021-11-13 18:28:28,950 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:28:29,253 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 19 proven. 0 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2021-11-13 18:28:29,253 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:28:29,253 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1958802626] [2021-11-13 18:28:29,254 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 18:28:29,254 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [328303773] [2021-11-13 18:28:29,254 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [328303773] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-13 18:28:29,254 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-13 18:28:29,254 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [12] total 14 [2021-11-13 18:28:29,255 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [12595578] [2021-11-13 18:28:29,255 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 18:28:29,255 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-13 18:28:29,256 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:28:29,256 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-13 18:28:29,256 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=150, Unknown=0, NotChecked=0, Total=182 [2021-11-13 18:28:29,257 INFO L87 Difference]: Start difference. First operand 220 states and 314 transitions. Second operand has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 3 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-13 18:28:29,407 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:28:29,407 INFO L93 Difference]: Finished difference Result 226 states and 319 transitions. [2021-11-13 18:28:29,407 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-13 18:28:29,408 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 3 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 70 [2021-11-13 18:28:29,408 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:28:29,411 INFO L225 Difference]: With dead ends: 226 [2021-11-13 18:28:29,412 INFO L226 Difference]: Without dead ends: 224 [2021-11-13 18:28:29,412 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 125 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=36, Invalid=174, Unknown=0, NotChecked=0, Total=210 [2021-11-13 18:28:29,413 INFO L933 BasicCegarLoop]: 38 mSDtfsCounter, 13 mSDsluCounter, 91 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 40.53ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 129 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.45ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 48.48ms IncrementalHoareTripleChecker+Time [2021-11-13 18:28:29,414 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 129 Invalid, 42 Unknown, 0 Unchecked, 1.45ms Time], IncrementalHoareTripleChecker [2 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 48.48ms Time] [2021-11-13 18:28:29,415 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 224 states. [2021-11-13 18:28:29,497 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 224 to 224. [2021-11-13 18:28:29,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 224 states, 130 states have (on average 1.2) internal successors, (156), 137 states have internal predecessors, (156), 81 states have call successors, (81), 12 states have call predecessors, (81), 12 states have return successors, (80), 74 states have call predecessors, (80), 80 states have call successors, (80) [2021-11-13 18:28:29,501 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 224 states to 224 states and 317 transitions. [2021-11-13 18:28:29,501 INFO L78 Accepts]: Start accepts. Automaton has 224 states and 317 transitions. Word has length 70 [2021-11-13 18:28:29,502 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:28:29,502 INFO L470 AbstractCegarLoop]: Abstraction has 224 states and 317 transitions. [2021-11-13 18:28:29,503 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 3 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-13 18:28:29,503 INFO L276 IsEmpty]: Start isEmpty. Operand 224 states and 317 transitions. [2021-11-13 18:28:29,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-13 18:28:29,505 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:28:29,505 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 3, 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, 1] [2021-11-13 18:28:29,539 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-13 18:28:29,711 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-13 18:28:29,711 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:28:29,712 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:28:29,712 INFO L85 PathProgramCache]: Analyzing trace with hash -1439093215, now seen corresponding path program 1 times [2021-11-13 18:28:29,712 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:28:29,712 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1630216824] [2021-11-13 18:28:29,712 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:28:29,712 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:28:29,725 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 18:28:29,725 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1265765718] [2021-11-13 18:28:29,725 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:28:29,725 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:28:29,725 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:28:29,735 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:28:29,743 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-13 18:28:29,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:28:29,810 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-13 18:28:29,813 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:28:30,028 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 25 proven. 9 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-13 18:28:30,029 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:28:30,234 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 25 proven. 9 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-13 18:28:30,234 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:28:30,234 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1630216824] [2021-11-13 18:28:30,234 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 18:28:30,235 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1265765718] [2021-11-13 18:28:30,235 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1265765718] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 18:28:30,235 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-13 18:28:30,235 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2021-11-13 18:28:30,235 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [959349169] [2021-11-13 18:28:30,235 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-13 18:28:30,236 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-13 18:28:30,236 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:28:30,236 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-13 18:28:30,237 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-11-13 18:28:30,237 INFO L87 Difference]: Start difference. First operand 224 states and 317 transitions. Second operand has 9 states, 9 states have (on average 3.888888888888889) internal successors, (35), 8 states have internal predecessors, (35), 3 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-13 18:28:30,577 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:28:30,577 INFO L93 Difference]: Finished difference Result 238 states and 328 transitions. [2021-11-13 18:28:30,578 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-13 18:28:30,578 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.888888888888889) internal successors, (35), 8 states have internal predecessors, (35), 3 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 68 [2021-11-13 18:28:30,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:28:30,581 INFO L225 Difference]: With dead ends: 238 [2021-11-13 18:28:30,581 INFO L226 Difference]: Without dead ends: 236 [2021-11-13 18:28:30,582 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 127 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2021-11-13 18:28:30,583 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 22 mSDsluCounter, 138 mSDsCounter, 0 mSdLazyCounter, 87 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 218.50ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 167 SdHoareTripleChecker+Invalid, 98 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.35ms SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 87 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 233.34ms IncrementalHoareTripleChecker+Time [2021-11-13 18:28:30,583 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 167 Invalid, 98 Unknown, 0 Unchecked, 2.35ms Time], IncrementalHoareTripleChecker [11 Valid, 87 Invalid, 0 Unknown, 0 Unchecked, 233.34ms Time] [2021-11-13 18:28:30,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 236 states. [2021-11-13 18:28:30,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 236 to 236. [2021-11-13 18:28:30,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 236 states, 139 states have (on average 1.1870503597122302) internal successors, (165), 146 states have internal predecessors, (165), 81 states have call successors, (81), 15 states have call predecessors, (81), 15 states have return successors, (80), 74 states have call predecessors, (80), 80 states have call successors, (80) [2021-11-13 18:28:30,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 236 states to 236 states and 326 transitions. [2021-11-13 18:28:30,655 INFO L78 Accepts]: Start accepts. Automaton has 236 states and 326 transitions. Word has length 68 [2021-11-13 18:28:30,655 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:28:30,655 INFO L470 AbstractCegarLoop]: Abstraction has 236 states and 326 transitions. [2021-11-13 18:28:30,656 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 3.888888888888889) internal successors, (35), 8 states have internal predecessors, (35), 3 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-13 18:28:30,656 INFO L276 IsEmpty]: Start isEmpty. Operand 236 states and 326 transitions. [2021-11-13 18:28:30,657 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-11-13 18:28:30,658 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:28:30,658 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 4, 4, 4, 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, 1, 1, 1] [2021-11-13 18:28:30,705 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-13 18:28:30,871 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-13 18:28:30,871 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:28:30,872 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:28:30,872 INFO L85 PathProgramCache]: Analyzing trace with hash 798002477, now seen corresponding path program 2 times [2021-11-13 18:28:30,872 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:28:30,872 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1648489196] [2021-11-13 18:28:30,872 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:28:30,872 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:28:30,887 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 18:28:30,896 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1838428450] [2021-11-13 18:28:30,896 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-13 18:28:30,896 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:28:30,897 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:28:30,897 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:28:30,915 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-13 18:28:30,953 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-13 18:28:30,953 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 18:28:30,954 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-13 18:28:30,956 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:28:31,166 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 48 proven. 0 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2021-11-13 18:28:31,167 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-13 18:28:31,167 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:28:31,167 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1648489196] [2021-11-13 18:28:31,167 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 18:28:31,167 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1838428450] [2021-11-13 18:28:31,167 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1838428450] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 18:28:31,167 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 18:28:31,167 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-13 18:28:31,168 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [463878296] [2021-11-13 18:28:31,168 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 18:28:31,168 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-13 18:28:31,168 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:28:31,169 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-13 18:28:31,169 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-13 18:28:31,169 INFO L87 Difference]: Start difference. First operand 236 states and 326 transitions. Second operand has 5 states, 5 states have (on average 5.4) internal successors, (27), 5 states have internal predecessors, (27), 3 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-13 18:28:31,283 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:28:31,284 INFO L93 Difference]: Finished difference Result 398 states and 544 transitions. [2021-11-13 18:28:31,284 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-13 18:28:31,285 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 5.4) internal successors, (27), 5 states have internal predecessors, (27), 3 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 73 [2021-11-13 18:28:31,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:28:31,288 INFO L225 Difference]: With dead ends: 398 [2021-11-13 18:28:31,288 INFO L226 Difference]: Without dead ends: 245 [2021-11-13 18:28:31,289 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 70 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-13 18:28:31,291 INFO L933 BasicCegarLoop]: 41 mSDtfsCounter, 3 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 36.37ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 103 SdHoareTripleChecker+Invalid, 39 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.87ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 43.19ms IncrementalHoareTripleChecker+Time [2021-11-13 18:28:31,291 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 103 Invalid, 39 Unknown, 0 Unchecked, 0.87ms Time], IncrementalHoareTripleChecker [2 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 43.19ms Time] [2021-11-13 18:28:31,292 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 245 states. [2021-11-13 18:28:31,360 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 245 to 233. [2021-11-13 18:28:31,360 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 233 states, 144 states have (on average 1.1805555555555556) internal successors, (170), 145 states have internal predecessors, (170), 73 states have call successors, (73), 15 states have call predecessors, (73), 15 states have return successors, (72), 72 states have call predecessors, (72), 72 states have call successors, (72) [2021-11-13 18:28:31,362 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 233 states to 233 states and 315 transitions. [2021-11-13 18:28:31,363 INFO L78 Accepts]: Start accepts. Automaton has 233 states and 315 transitions. Word has length 73 [2021-11-13 18:28:31,363 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:28:31,364 INFO L470 AbstractCegarLoop]: Abstraction has 233 states and 315 transitions. [2021-11-13 18:28:31,364 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 5.4) internal successors, (27), 5 states have internal predecessors, (27), 3 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-13 18:28:31,364 INFO L276 IsEmpty]: Start isEmpty. Operand 233 states and 315 transitions. [2021-11-13 18:28:31,365 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-11-13 18:28:31,366 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:28:31,366 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 4, 4, 4, 4, 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] [2021-11-13 18:28:31,406 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-13 18:28:31,591 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-13 18:28:31,591 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:28:31,592 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:28:31,592 INFO L85 PathProgramCache]: Analyzing trace with hash -1622368081, now seen corresponding path program 3 times [2021-11-13 18:28:31,592 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:28:31,592 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1196071426] [2021-11-13 18:28:31,592 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:28:31,592 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:28:31,603 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 18:28:31,603 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [608848486] [2021-11-13 18:28:31,603 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 18:28:31,604 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:28:31,604 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:28:31,605 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:28:31,623 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-13 18:28:31,688 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-13 18:28:31,688 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 18:28:31,690 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 59 conjunts are in the unsatisfiable core [2021-11-13 18:28:31,693 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:28:32,960 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 10 proven. 22 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2021-11-13 18:28:32,960 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:28:34,741 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 14 proven. 18 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2021-11-13 18:28:34,741 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:28:34,741 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1196071426] [2021-11-13 18:28:34,741 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 18:28:34,742 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [608848486] [2021-11-13 18:28:34,742 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [608848486] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 18:28:34,742 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-13 18:28:34,742 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 23 [2021-11-13 18:28:34,742 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [484694966] [2021-11-13 18:28:34,742 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-13 18:28:34,743 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-13 18:28:34,743 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:28:34,743 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-13 18:28:34,744 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=411, Unknown=0, NotChecked=0, Total=506 [2021-11-13 18:28:34,744 INFO L87 Difference]: Start difference. First operand 233 states and 315 transitions. Second operand has 23 states, 23 states have (on average 2.347826086956522) internal successors, (54), 22 states have internal predecessors, (54), 5 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) [2021-11-13 18:28:51,015 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.40s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-13 18:29:07,902 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:29:07,902 INFO L93 Difference]: Finished difference Result 371 states and 496 transitions. [2021-11-13 18:29:07,902 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-13 18:29:07,903 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.347826086956522) internal successors, (54), 22 states have internal predecessors, (54), 5 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) Word has length 73 [2021-11-13 18:29:07,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:29:07,906 INFO L225 Difference]: With dead ends: 371 [2021-11-13 18:29:07,906 INFO L226 Difference]: Without dead ends: 369 [2021-11-13 18:29:07,908 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 122 SyntacticMatches, 1 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 480 ImplicationChecksByTransitivity, 22.2s TimeCoverageRelationStatistics Valid=479, Invalid=1777, Unknown=0, NotChecked=0, Total=2256 [2021-11-13 18:29:07,909 INFO L933 BasicCegarLoop]: 65 mSDtfsCounter, 179 mSDsluCounter, 476 mSDsCounter, 0 mSdLazyCounter, 802 mSolverCounterSat, 343 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 12296.70ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 183 SdHoareTripleChecker+Valid, 541 SdHoareTripleChecker+Invalid, 1145 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 11.58ms SdHoareTripleChecker+Time, 343 IncrementalHoareTripleChecker+Valid, 802 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 12458.31ms IncrementalHoareTripleChecker+Time [2021-11-13 18:29:07,909 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [183 Valid, 541 Invalid, 1145 Unknown, 0 Unchecked, 11.58ms Time], IncrementalHoareTripleChecker [343 Valid, 802 Invalid, 0 Unknown, 0 Unchecked, 12458.31ms Time] [2021-11-13 18:29:07,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 369 states. [2021-11-13 18:29:08,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 369 to 312. [2021-11-13 18:29:08,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 312 states, 197 states have (on average 1.1725888324873097) internal successors, (231), 198 states have internal predecessors, (231), 93 states have call successors, (93), 21 states have call predecessors, (93), 21 states have return successors, (92), 92 states have call predecessors, (92), 92 states have call successors, (92) [2021-11-13 18:29:08,020 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 312 states to 312 states and 416 transitions. [2021-11-13 18:29:08,020 INFO L78 Accepts]: Start accepts. Automaton has 312 states and 416 transitions. Word has length 73 [2021-11-13 18:29:08,021 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:29:08,021 INFO L470 AbstractCegarLoop]: Abstraction has 312 states and 416 transitions. [2021-11-13 18:29:08,021 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 2.347826086956522) internal successors, (54), 22 states have internal predecessors, (54), 5 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) [2021-11-13 18:29:08,021 INFO L276 IsEmpty]: Start isEmpty. Operand 312 states and 416 transitions. [2021-11-13 18:29:08,023 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-11-13 18:29:08,023 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:29:08,023 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1] [2021-11-13 18:29:08,053 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-13 18:29:08,224 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-13 18:29:08,224 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:29:08,224 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:29:08,225 INFO L85 PathProgramCache]: Analyzing trace with hash 160585404, now seen corresponding path program 1 times [2021-11-13 18:29:08,225 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:29:08,225 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [390417096] [2021-11-13 18:29:08,225 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:29:08,225 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:29:08,235 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 18:29:08,235 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1026777518] [2021-11-13 18:29:08,235 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:29:08,236 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:29:08,236 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:29:08,246 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:29:08,248 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-13 18:29:08,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:29:08,314 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 85 conjunts are in the unsatisfiable core [2021-11-13 18:29:08,317 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:29:09,697 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 51 proven. 32 refuted. 0 times theorem prover too weak. 88 trivial. 0 not checked. [2021-11-13 18:29:09,698 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:29:12,040 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 61 proven. 17 refuted. 0 times theorem prover too weak. 93 trivial. 0 not checked. [2021-11-13 18:29:12,040 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:29:12,040 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [390417096] [2021-11-13 18:29:12,041 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 18:29:12,041 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1026777518] [2021-11-13 18:29:12,041 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1026777518] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 18:29:12,041 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-13 18:29:12,042 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 15] total 27 [2021-11-13 18:29:12,042 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1635533032] [2021-11-13 18:29:12,042 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-13 18:29:12,043 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-13 18:29:12,043 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:29:12,044 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-13 18:29:12,044 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=596, Unknown=0, NotChecked=0, Total=702 [2021-11-13 18:29:12,045 INFO L87 Difference]: Start difference. First operand 312 states and 416 transitions. Second operand has 27 states, 22 states have (on average 2.5454545454545454) internal successors, (56), 23 states have internal predecessors, (56), 11 states have call successors, (22), 2 states have call predecessors, (22), 2 states have return successors, (20), 8 states have call predecessors, (20), 9 states have call successors, (20) [2021-11-13 18:29:22,140 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-13 18:29:25,500 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-13 18:29:32,340 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-13 18:29:35,780 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-13 18:29:38,529 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-13 18:29:41,688 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.13s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-13 18:29:45,437 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.32s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-13 18:29:49,090 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-13 18:29:51,247 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-13 18:29:53,771 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-13 18:29:55,779 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-13 18:30:00,448 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-13 18:30:06,031 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-13 18:30:08,038 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-13 18:30:09,840 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.79s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-13 18:30:11,868 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-13 18:30:25,702 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-13 18:30:30,339 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-13 18:30:30,351 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:30:30,352 INFO L93 Difference]: Finished difference Result 535 states and 743 transitions. [2021-11-13 18:30:30,354 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2021-11-13 18:30:30,354 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 22 states have (on average 2.5454545454545454) internal successors, (56), 23 states have internal predecessors, (56), 11 states have call successors, (22), 2 states have call predecessors, (22), 2 states have return successors, (20), 8 states have call predecessors, (20), 9 states have call successors, (20) Word has length 87 [2021-11-13 18:30:30,354 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:30:30,358 INFO L225 Difference]: With dead ends: 535 [2021-11-13 18:30:30,358 INFO L226 Difference]: Without dead ends: 527 [2021-11-13 18:30:30,361 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 241 GetRequests, 159 SyntacticMatches, 2 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1869 ImplicationChecksByTransitivity, 24.4s TimeCoverageRelationStatistics Valid=1139, Invalid=5503, Unknown=0, NotChecked=0, Total=6642 [2021-11-13 18:30:30,362 INFO L933 BasicCegarLoop]: 60 mSDtfsCounter, 184 mSDsluCounter, 650 mSDsCounter, 0 mSdLazyCounter, 1972 mSolverCounterSat, 476 mSolverCounterUnsat, 16 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 54859.11ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 187 SdHoareTripleChecker+Valid, 710 SdHoareTripleChecker+Invalid, 2464 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 18.24ms SdHoareTripleChecker+Time, 476 IncrementalHoareTripleChecker+Valid, 1972 IncrementalHoareTripleChecker+Invalid, 16 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 55214.21ms IncrementalHoareTripleChecker+Time [2021-11-13 18:30:30,362 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [187 Valid, 710 Invalid, 2464 Unknown, 0 Unchecked, 18.24ms Time], IncrementalHoareTripleChecker [476 Valid, 1972 Invalid, 16 Unknown, 0 Unchecked, 55214.21ms Time] [2021-11-13 18:30:30,363 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 527 states. [2021-11-13 18:30:30,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 527 to 470. [2021-11-13 18:30:30,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 470 states, 273 states have (on average 1.2087912087912087) internal successors, (330), 274 states have internal predecessors, (330), 169 states have call successors, (169), 27 states have call predecessors, (169), 27 states have return successors, (168), 168 states have call predecessors, (168), 168 states have call successors, (168) [2021-11-13 18:30:30,552 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 470 states to 470 states and 667 transitions. [2021-11-13 18:30:30,552 INFO L78 Accepts]: Start accepts. Automaton has 470 states and 667 transitions. Word has length 87 [2021-11-13 18:30:30,553 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:30:30,553 INFO L470 AbstractCegarLoop]: Abstraction has 470 states and 667 transitions. [2021-11-13 18:30:30,553 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 22 states have (on average 2.5454545454545454) internal successors, (56), 23 states have internal predecessors, (56), 11 states have call successors, (22), 2 states have call predecessors, (22), 2 states have return successors, (20), 8 states have call predecessors, (20), 9 states have call successors, (20) [2021-11-13 18:30:30,553 INFO L276 IsEmpty]: Start isEmpty. Operand 470 states and 667 transitions. [2021-11-13 18:30:30,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-11-13 18:30:30,555 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:30:30,556 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 5, 4, 4, 4, 4, 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, 1, 1] [2021-11-13 18:30:30,590 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-13 18:30:30,779 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-13 18:30:30,779 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:30:30,779 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:30:30,780 INFO L85 PathProgramCache]: Analyzing trace with hash -1330396859, now seen corresponding path program 2 times [2021-11-13 18:30:30,780 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:30:30,780 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1993985040] [2021-11-13 18:30:30,780 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:30:30,780 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:30:30,788 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 18:30:30,788 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1787149272] [2021-11-13 18:30:30,789 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-13 18:30:30,789 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:30:30,789 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:30:30,796 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:30:30,799 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-13 18:30:30,851 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-13 18:30:30,852 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 18:30:30,853 INFO L263 TraceCheckSpWp]: Trace formula consists of 259 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-13 18:30:30,855 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:30:31,069 INFO L134 CoverageAnalysis]: Checked inductivity of 194 backedges. 38 proven. 16 refuted. 0 times theorem prover too weak. 140 trivial. 0 not checked. [2021-11-13 18:30:31,069 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:30:31,245 INFO L134 CoverageAnalysis]: Checked inductivity of 194 backedges. 38 proven. 16 refuted. 0 times theorem prover too weak. 140 trivial. 0 not checked. [2021-11-13 18:30:31,246 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:30:31,246 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1993985040] [2021-11-13 18:30:31,246 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 18:30:31,246 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1787149272] [2021-11-13 18:30:31,246 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1787149272] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 18:30:31,246 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-13 18:30:31,246 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 11 [2021-11-13 18:30:31,246 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [451378917] [2021-11-13 18:30:31,246 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-13 18:30:31,247 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-13 18:30:31,247 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:30:31,247 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-13 18:30:31,248 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=89, Unknown=0, NotChecked=0, Total=110 [2021-11-13 18:30:31,248 INFO L87 Difference]: Start difference. First operand 470 states and 667 transitions. Second operand has 11 states, 11 states have (on average 3.5454545454545454) internal successors, (39), 11 states have internal predecessors, (39), 4 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) [2021-11-13 18:30:32,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:30:32,064 INFO L93 Difference]: Finished difference Result 646 states and 933 transitions. [2021-11-13 18:30:32,065 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-13 18:30:32,065 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 3.5454545454545454) internal successors, (39), 11 states have internal predecessors, (39), 4 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) Word has length 95 [2021-11-13 18:30:32,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:30:32,070 INFO L225 Difference]: With dead ends: 646 [2021-11-13 18:30:32,070 INFO L226 Difference]: Without dead ends: 639 [2021-11-13 18:30:32,073 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 213 GetRequests, 186 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 144 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=189, Invalid=623, Unknown=0, NotChecked=0, Total=812 [2021-11-13 18:30:32,073 INFO L933 BasicCegarLoop]: 87 mSDtfsCounter, 65 mSDsluCounter, 370 mSDsCounter, 0 mSdLazyCounter, 357 mSolverCounterSat, 103 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 283.37ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 457 SdHoareTripleChecker+Invalid, 460 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.98ms SdHoareTripleChecker+Time, 103 IncrementalHoareTripleChecker+Valid, 357 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 361.46ms IncrementalHoareTripleChecker+Time [2021-11-13 18:30:32,074 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [69 Valid, 457 Invalid, 460 Unknown, 0 Unchecked, 2.98ms Time], IncrementalHoareTripleChecker [103 Valid, 357 Invalid, 0 Unknown, 0 Unchecked, 361.46ms Time] [2021-11-13 18:30:32,075 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 639 states. [2021-11-13 18:30:32,224 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 639 to 433. [2021-11-13 18:30:32,226 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 433 states, 244 states have (on average 1.2172131147540983) internal successors, (297), 245 states have internal predecessors, (297), 161 states have call successors, (161), 27 states have call predecessors, (161), 27 states have return successors, (160), 160 states have call predecessors, (160), 160 states have call successors, (160) [2021-11-13 18:30:32,229 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 433 states to 433 states and 618 transitions. [2021-11-13 18:30:32,229 INFO L78 Accepts]: Start accepts. Automaton has 433 states and 618 transitions. Word has length 95 [2021-11-13 18:30:32,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:30:32,229 INFO L470 AbstractCegarLoop]: Abstraction has 433 states and 618 transitions. [2021-11-13 18:30:32,230 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 3.5454545454545454) internal successors, (39), 11 states have internal predecessors, (39), 4 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) [2021-11-13 18:30:32,230 INFO L276 IsEmpty]: Start isEmpty. Operand 433 states and 618 transitions. [2021-11-13 18:30:32,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-11-13 18:30:32,232 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:30:32,232 INFO L514 BasicCegarLoop]: trace histogram [13, 12, 12, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:30:32,264 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-13 18:30:32,451 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-13 18:30:32,451 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:30:32,451 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:30:32,452 INFO L85 PathProgramCache]: Analyzing trace with hash 2024025072, now seen corresponding path program 2 times [2021-11-13 18:30:32,452 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:30:32,452 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1498444255] [2021-11-13 18:30:32,452 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:30:32,452 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:30:32,462 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 18:30:32,463 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [430914420] [2021-11-13 18:30:32,463 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-13 18:30:32,463 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:30:32,463 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:30:32,475 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:30:32,486 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-13 18:30:32,554 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-13 18:30:32,554 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 18:30:32,556 INFO L263 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 80 conjunts are in the unsatisfiable core [2021-11-13 18:30:32,559 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:30:34,396 INFO L134 CoverageAnalysis]: Checked inductivity of 339 backedges. 124 proven. 32 refuted. 0 times theorem prover too weak. 183 trivial. 0 not checked. [2021-11-13 18:30:34,396 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:30:38,823 INFO L134 CoverageAnalysis]: Checked inductivity of 339 backedges. 131 proven. 4 refuted. 0 times theorem prover too weak. 204 trivial. 0 not checked. [2021-11-13 18:30:38,823 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:30:38,823 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1498444255] [2021-11-13 18:30:38,823 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 18:30:38,823 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [430914420] [2021-11-13 18:30:38,824 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [430914420] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 18:30:38,824 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-13 18:30:38,824 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 13] total 25 [2021-11-13 18:30:38,824 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [747274802] [2021-11-13 18:30:38,824 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-13 18:30:38,825 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-13 18:30:38,825 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:30:38,825 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-13 18:30:38,825 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=480, Unknown=0, NotChecked=0, Total=600 [2021-11-13 18:30:38,826 INFO L87 Difference]: Start difference. First operand 433 states and 618 transitions. Second operand has 25 states, 20 states have (on average 2.65) internal successors, (53), 21 states have internal predecessors, (53), 10 states have call successors, (25), 2 states have call predecessors, (25), 2 states have return successors, (24), 10 states have call predecessors, (24), 8 states have call successors, (24) [2021-11-13 18:30:49,607 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.16s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-13 18:30:50,246 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:30:50,247 INFO L93 Difference]: Finished difference Result 585 states and 834 transitions. [2021-11-13 18:30:50,247 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-11-13 18:30:50,247 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 20 states have (on average 2.65) internal successors, (53), 21 states have internal predecessors, (53), 10 states have call successors, (25), 2 states have call predecessors, (25), 2 states have return successors, (24), 10 states have call predecessors, (24), 8 states have call successors, (24) Word has length 107 [2021-11-13 18:30:50,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:30:50,252 INFO L225 Difference]: With dead ends: 585 [2021-11-13 18:30:50,252 INFO L226 Difference]: Without dead ends: 577 [2021-11-13 18:30:50,253 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 243 GetRequests, 194 SyntacticMatches, 3 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 545 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=482, Invalid=1774, Unknown=0, NotChecked=0, Total=2256 [2021-11-13 18:30:50,254 INFO L933 BasicCegarLoop]: 44 mSDtfsCounter, 82 mSDsluCounter, 561 mSDsCounter, 0 mSdLazyCounter, 1143 mSolverCounterSat, 163 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6313.25ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 94 SdHoareTripleChecker+Valid, 605 SdHoareTripleChecker+Invalid, 1307 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 8.17ms SdHoareTripleChecker+Time, 163 IncrementalHoareTripleChecker+Valid, 1143 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6494.63ms IncrementalHoareTripleChecker+Time [2021-11-13 18:30:50,255 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [94 Valid, 605 Invalid, 1307 Unknown, 0 Unchecked, 8.17ms Time], IncrementalHoareTripleChecker [163 Valid, 1143 Invalid, 1 Unknown, 0 Unchecked, 6494.63ms Time] [2021-11-13 18:30:50,256 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 577 states. [2021-11-13 18:30:50,414 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 577 to 411. [2021-11-13 18:30:50,415 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 411 states, 239 states have (on average 1.1882845188284519) internal successors, (284), 239 states have internal predecessors, (284), 140 states have call successors, (140), 31 states have call predecessors, (140), 31 states have return successors, (140), 140 states have call predecessors, (140), 140 states have call successors, (140) [2021-11-13 18:30:50,418 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 411 states to 411 states and 564 transitions. [2021-11-13 18:30:50,418 INFO L78 Accepts]: Start accepts. Automaton has 411 states and 564 transitions. Word has length 107 [2021-11-13 18:30:50,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:30:50,419 INFO L470 AbstractCegarLoop]: Abstraction has 411 states and 564 transitions. [2021-11-13 18:30:50,419 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 20 states have (on average 2.65) internal successors, (53), 21 states have internal predecessors, (53), 10 states have call successors, (25), 2 states have call predecessors, (25), 2 states have return successors, (24), 10 states have call predecessors, (24), 8 states have call successors, (24) [2021-11-13 18:30:50,419 INFO L276 IsEmpty]: Start isEmpty. Operand 411 states and 564 transitions. [2021-11-13 18:30:50,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2021-11-13 18:30:50,422 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:30:50,422 INFO L514 BasicCegarLoop]: trace histogram [15, 14, 14, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:30:50,457 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-13 18:30:50,647 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-13 18:30:50,647 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:30:50,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:30:50,648 INFO L85 PathProgramCache]: Analyzing trace with hash 1576994048, now seen corresponding path program 1 times [2021-11-13 18:30:50,648 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:30:50,648 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1269860986] [2021-11-13 18:30:50,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:30:50,648 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:30:50,655 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 18:30:50,655 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1304253381] [2021-11-13 18:30:50,655 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:30:50,656 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:30:50,656 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:30:50,663 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:30:50,665 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-13 18:30:50,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:30:50,733 INFO L263 TraceCheckSpWp]: Trace formula consists of 285 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-13 18:30:50,735 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:30:51,101 INFO L134 CoverageAnalysis]: Checked inductivity of 461 backedges. 85 proven. 23 refuted. 0 times theorem prover too weak. 353 trivial. 0 not checked. [2021-11-13 18:30:51,101 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:30:51,467 INFO L134 CoverageAnalysis]: Checked inductivity of 461 backedges. 94 proven. 7 refuted. 0 times theorem prover too weak. 360 trivial. 0 not checked. [2021-11-13 18:30:51,467 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:30:51,467 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1269860986] [2021-11-13 18:30:51,467 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 18:30:51,467 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1304253381] [2021-11-13 18:30:51,467 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1304253381] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 18:30:51,467 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-13 18:30:51,468 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 14 [2021-11-13 18:30:51,468 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1961217388] [2021-11-13 18:30:51,468 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-13 18:30:51,468 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-13 18:30:51,468 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:30:51,469 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-13 18:30:51,469 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=139, Unknown=0, NotChecked=0, Total=182 [2021-11-13 18:30:51,469 INFO L87 Difference]: Start difference. First operand 411 states and 564 transitions. Second operand has 14 states, 14 states have (on average 3.357142857142857) internal successors, (47), 13 states have internal predecessors, (47), 6 states have call successors, (26), 2 states have call predecessors, (26), 2 states have return successors, (25), 7 states have call predecessors, (25), 6 states have call successors, (25) [2021-11-13 18:30:52,172 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:30:52,173 INFO L93 Difference]: Finished difference Result 554 states and 783 transitions. [2021-11-13 18:30:52,173 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-13 18:30:52,173 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.357142857142857) internal successors, (47), 13 states have internal predecessors, (47), 6 states have call successors, (26), 2 states have call predecessors, (26), 2 states have return successors, (25), 7 states have call predecessors, (25), 6 states have call successors, (25) Word has length 120 [2021-11-13 18:30:52,174 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:30:52,177 INFO L225 Difference]: With dead ends: 554 [2021-11-13 18:30:52,178 INFO L226 Difference]: Without dead ends: 552 [2021-11-13 18:30:52,178 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 246 GetRequests, 227 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 59 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=79, Invalid=263, Unknown=0, NotChecked=0, Total=342 [2021-11-13 18:30:52,179 INFO L933 BasicCegarLoop]: 39 mSDtfsCounter, 39 mSDsluCounter, 235 mSDsCounter, 0 mSdLazyCounter, 374 mSolverCounterSat, 69 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 398.52ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 274 SdHoareTripleChecker+Invalid, 443 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.35ms SdHoareTripleChecker+Time, 69 IncrementalHoareTripleChecker+Valid, 374 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 447.24ms IncrementalHoareTripleChecker+Time [2021-11-13 18:30:52,179 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 274 Invalid, 443 Unknown, 0 Unchecked, 2.35ms Time], IncrementalHoareTripleChecker [69 Valid, 374 Invalid, 0 Unknown, 0 Unchecked, 447.24ms Time] [2021-11-13 18:30:52,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 552 states. [2021-11-13 18:30:52,333 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 552 to 336. [2021-11-13 18:30:52,334 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 336 states, 198 states have (on average 1.1767676767676767) internal successors, (233), 198 states have internal predecessors, (233), 108 states have call successors, (108), 29 states have call predecessors, (108), 29 states have return successors, (108), 108 states have call predecessors, (108), 108 states have call successors, (108) [2021-11-13 18:30:52,336 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 336 states to 336 states and 449 transitions. [2021-11-13 18:30:52,337 INFO L78 Accepts]: Start accepts. Automaton has 336 states and 449 transitions. Word has length 120 [2021-11-13 18:30:52,337 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:30:52,337 INFO L470 AbstractCegarLoop]: Abstraction has 336 states and 449 transitions. [2021-11-13 18:30:52,338 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 3.357142857142857) internal successors, (47), 13 states have internal predecessors, (47), 6 states have call successors, (26), 2 states have call predecessors, (26), 2 states have return successors, (25), 7 states have call predecessors, (25), 6 states have call successors, (25) [2021-11-13 18:30:52,338 INFO L276 IsEmpty]: Start isEmpty. Operand 336 states and 449 transitions. [2021-11-13 18:30:52,340 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2021-11-13 18:30:52,340 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:30:52,340 INFO L514 BasicCegarLoop]: trace histogram [14, 13, 13, 5, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:30:52,378 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-13 18:30:52,555 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:30:52,555 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:30:52,555 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:30:52,555 INFO L85 PathProgramCache]: Analyzing trace with hash -843376510, now seen corresponding path program 2 times [2021-11-13 18:30:52,556 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:30:52,556 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1165040735] [2021-11-13 18:30:52,556 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:30:52,556 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:30:52,563 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 18:30:52,563 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1354285796] [2021-11-13 18:30:52,563 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-13 18:30:52,564 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:30:52,564 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:30:52,565 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:30:52,579 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-13 18:30:52,629 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-13 18:30:52,630 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 18:30:52,631 INFO L263 TraceCheckSpWp]: Trace formula consists of 298 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-13 18:30:52,634 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:30:53,217 INFO L134 CoverageAnalysis]: Checked inductivity of 417 backedges. 89 proven. 45 refuted. 0 times theorem prover too weak. 283 trivial. 0 not checked. [2021-11-13 18:30:53,217 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:30:54,636 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:30:54,637 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1165040735] [2021-11-13 18:30:54,637 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 18:30:54,637 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1354285796] [2021-11-13 18:30:54,637 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1354285796] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 18:30:54,637 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-13 18:30:54,638 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2021-11-13 18:30:54,638 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [257429431] [2021-11-13 18:30:54,638 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-13 18:30:54,639 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-13 18:30:54,639 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:30:54,640 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-13 18:30:54,640 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=389, Unknown=0, NotChecked=0, Total=462 [2021-11-13 18:30:54,641 INFO L87 Difference]: Start difference. First operand 336 states and 449 transitions. Second operand has 15 states, 15 states have (on average 2.933333333333333) internal successors, (44), 15 states have internal predecessors, (44), 6 states have call successors, (18), 2 states have call predecessors, (18), 3 states have return successors, (17), 5 states have call predecessors, (17), 6 states have call successors, (17) [2021-11-13 18:30:55,839 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:30:55,839 INFO L93 Difference]: Finished difference Result 473 states and 638 transitions. [2021-11-13 18:30:55,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-13 18:30:55,840 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.933333333333333) internal successors, (44), 15 states have internal predecessors, (44), 6 states have call successors, (18), 2 states have call predecessors, (18), 3 states have return successors, (17), 5 states have call predecessors, (17), 6 states have call successors, (17) Word has length 120 [2021-11-13 18:30:55,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:30:55,843 INFO L225 Difference]: With dead ends: 473 [2021-11-13 18:30:55,843 INFO L226 Difference]: Without dead ends: 409 [2021-11-13 18:30:55,845 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 207 GetRequests, 170 SyntacticMatches, 1 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=255, Invalid=1151, Unknown=0, NotChecked=0, Total=1406 [2021-11-13 18:30:55,845 INFO L933 BasicCegarLoop]: 79 mSDtfsCounter, 86 mSDsluCounter, 650 mSDsCounter, 0 mSdLazyCounter, 594 mSolverCounterSat, 114 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 615.62ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 90 SdHoareTripleChecker+Valid, 729 SdHoareTripleChecker+Invalid, 708 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.60ms SdHoareTripleChecker+Time, 114 IncrementalHoareTripleChecker+Valid, 594 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 718.19ms IncrementalHoareTripleChecker+Time [2021-11-13 18:30:55,846 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [90 Valid, 729 Invalid, 708 Unknown, 0 Unchecked, 4.60ms Time], IncrementalHoareTripleChecker [114 Valid, 594 Invalid, 0 Unknown, 0 Unchecked, 718.19ms Time] [2021-11-13 18:30:55,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 409 states. [2021-11-13 18:30:56,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 409 to 359. [2021-11-13 18:30:56,027 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 359 states, 213 states have (on average 1.1737089201877935) internal successors, (250), 213 states have internal predecessors, (250), 116 states have call successors, (116), 29 states have call predecessors, (116), 29 states have return successors, (116), 116 states have call predecessors, (116), 116 states have call successors, (116) [2021-11-13 18:30:56,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 359 states to 359 states and 482 transitions. [2021-11-13 18:30:56,029 INFO L78 Accepts]: Start accepts. Automaton has 359 states and 482 transitions. Word has length 120 [2021-11-13 18:30:56,030 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:30:56,030 INFO L470 AbstractCegarLoop]: Abstraction has 359 states and 482 transitions. [2021-11-13 18:30:56,030 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.933333333333333) internal successors, (44), 15 states have internal predecessors, (44), 6 states have call successors, (18), 2 states have call predecessors, (18), 3 states have return successors, (17), 5 states have call predecessors, (17), 6 states have call successors, (17) [2021-11-13 18:30:56,030 INFO L276 IsEmpty]: Start isEmpty. Operand 359 states and 482 transitions. [2021-11-13 18:30:56,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2021-11-13 18:30:56,034 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:30:56,034 INFO L514 BasicCegarLoop]: trace histogram [14, 13, 13, 6, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:30:56,075 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-13 18:30:56,255 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:30:56,255 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:30:56,255 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:30:56,255 INFO L85 PathProgramCache]: Analyzing trace with hash 1948772218, now seen corresponding path program 3 times [2021-11-13 18:30:56,255 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:30:56,256 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [918128334] [2021-11-13 18:30:56,256 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:30:56,256 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:30:56,267 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 18:30:56,267 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1402689492] [2021-11-13 18:30:56,268 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 18:30:56,268 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:30:56,268 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:30:56,269 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:30:56,272 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-13 18:30:56,353 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-13 18:30:56,354 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 18:30:56,355 INFO L263 TraceCheckSpWp]: Trace formula consists of 275 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-13 18:30:56,358 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:30:56,866 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 98 proven. 54 refuted. 0 times theorem prover too weak. 283 trivial. 0 not checked. [2021-11-13 18:30:56,866 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:30:58,052 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:30:58,052 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [918128334] [2021-11-13 18:30:58,052 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 18:30:58,052 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1402689492] [2021-11-13 18:30:58,052 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1402689492] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 18:30:58,053 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-13 18:30:58,053 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2021-11-13 18:30:58,053 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1759842070] [2021-11-13 18:30:58,053 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-13 18:30:58,055 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-13 18:30:58,055 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:30:58,056 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-13 18:30:58,056 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=428, Unknown=0, NotChecked=0, Total=506 [2021-11-13 18:30:58,056 INFO L87 Difference]: Start difference. First operand 359 states and 482 transitions. Second operand has 16 states, 16 states have (on average 3.0625) internal successors, (49), 15 states have internal predecessors, (49), 6 states have call successors, (18), 2 states have call predecessors, (18), 3 states have return successors, (17), 6 states have call predecessors, (17), 6 states have call successors, (17) [2021-11-13 18:30:59,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:30:59,607 INFO L93 Difference]: Finished difference Result 607 states and 851 transitions. [2021-11-13 18:30:59,608 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-13 18:30:59,608 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 3.0625) internal successors, (49), 15 states have internal predecessors, (49), 6 states have call successors, (18), 2 states have call predecessors, (18), 3 states have return successors, (17), 6 states have call predecessors, (17), 6 states have call successors, (17) Word has length 125 [2021-11-13 18:30:59,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:30:59,613 INFO L225 Difference]: With dead ends: 607 [2021-11-13 18:30:59,614 INFO L226 Difference]: Without dead ends: 542 [2021-11-13 18:30:59,615 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 219 GetRequests, 174 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 301 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=475, Invalid=1595, Unknown=0, NotChecked=0, Total=2070 [2021-11-13 18:30:59,616 INFO L933 BasicCegarLoop]: 105 mSDtfsCounter, 97 mSDsluCounter, 702 mSDsCounter, 0 mSdLazyCounter, 620 mSolverCounterSat, 255 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 631.75ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 97 SdHoareTripleChecker+Valid, 807 SdHoareTripleChecker+Invalid, 875 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 5.07ms SdHoareTripleChecker+Time, 255 IncrementalHoareTripleChecker+Valid, 620 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 713.27ms IncrementalHoareTripleChecker+Time [2021-11-13 18:30:59,617 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [97 Valid, 807 Invalid, 875 Unknown, 0 Unchecked, 5.07ms Time], IncrementalHoareTripleChecker [255 Valid, 620 Invalid, 0 Unknown, 0 Unchecked, 713.27ms Time] [2021-11-13 18:30:59,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 542 states. [2021-11-13 18:30:59,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 542 to 435. [2021-11-13 18:30:59,844 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 435 states, 257 states have (on average 1.1750972762645915) internal successors, (302), 257 states have internal predecessors, (302), 148 states have call successors, (148), 29 states have call predecessors, (148), 29 states have return successors, (148), 148 states have call predecessors, (148), 148 states have call successors, (148) [2021-11-13 18:30:59,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 435 states to 435 states and 598 transitions. [2021-11-13 18:30:59,847 INFO L78 Accepts]: Start accepts. Automaton has 435 states and 598 transitions. Word has length 125 [2021-11-13 18:30:59,848 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:30:59,848 INFO L470 AbstractCegarLoop]: Abstraction has 435 states and 598 transitions. [2021-11-13 18:30:59,848 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 3.0625) internal successors, (49), 15 states have internal predecessors, (49), 6 states have call successors, (18), 2 states have call predecessors, (18), 3 states have return successors, (17), 6 states have call predecessors, (17), 6 states have call successors, (17) [2021-11-13 18:30:59,849 INFO L276 IsEmpty]: Start isEmpty. Operand 435 states and 598 transitions. [2021-11-13 18:30:59,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2021-11-13 18:30:59,852 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:30:59,852 INFO L514 BasicCegarLoop]: trace histogram [18, 17, 17, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:30:59,903 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-13 18:31:00,067 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-11-13 18:31:00,067 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:31:00,068 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:31:00,068 INFO L85 PathProgramCache]: Analyzing trace with hash 18331811, now seen corresponding path program 4 times [2021-11-13 18:31:00,068 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:31:00,068 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1979899649] [2021-11-13 18:31:00,068 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:31:00,068 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:31:00,078 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 18:31:00,078 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [698104707] [2021-11-13 18:31:00,078 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-13 18:31:00,079 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:31:00,079 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:31:00,080 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:31:00,087 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-13 18:31:00,148 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-13 18:31:00,148 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 18:31:00,149 INFO L263 TraceCheckSpWp]: Trace formula consists of 305 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-13 18:31:00,152 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:31:00,952 INFO L134 CoverageAnalysis]: Checked inductivity of 678 backedges. 116 proven. 63 refuted. 0 times theorem prover too weak. 499 trivial. 0 not checked. [2021-11-13 18:31:00,952 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:31:02,249 INFO L134 CoverageAnalysis]: Checked inductivity of 678 backedges. 57 proven. 62 refuted. 0 times theorem prover too weak. 559 trivial. 0 not checked. [2021-11-13 18:31:02,249 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:31:02,249 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1979899649] [2021-11-13 18:31:02,249 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 18:31:02,250 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [698104707] [2021-11-13 18:31:02,250 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [698104707] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 18:31:02,250 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-13 18:31:02,250 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 17] total 30 [2021-11-13 18:31:02,250 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1456821870] [2021-11-13 18:31:02,250 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-13 18:31:02,251 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-11-13 18:31:02,251 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:31:02,251 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-11-13 18:31:02,252 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=745, Unknown=0, NotChecked=0, Total=870 [2021-11-13 18:31:02,252 INFO L87 Difference]: Start difference. First operand 435 states and 598 transitions. Second operand has 30 states, 30 states have (on average 2.533333333333333) internal successors, (76), 30 states have internal predecessors, (76), 12 states have call successors, (42), 2 states have call predecessors, (42), 3 states have return successors, (42), 11 states have call predecessors, (42), 12 states have call successors, (42) [2021-11-13 18:31:12,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:31:12,635 INFO L93 Difference]: Finished difference Result 1002 states and 1466 transitions. [2021-11-13 18:31:12,636 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2021-11-13 18:31:12,636 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 2.533333333333333) internal successors, (76), 30 states have internal predecessors, (76), 12 states have call successors, (42), 2 states have call predecessors, (42), 3 states have return successors, (42), 11 states have call predecessors, (42), 12 states have call successors, (42) Word has length 142 [2021-11-13 18:31:12,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:31:12,642 INFO L225 Difference]: With dead ends: 1002 [2021-11-13 18:31:12,642 INFO L226 Difference]: Without dead ends: 804 [2021-11-13 18:31:12,647 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 366 GetRequests, 255 SyntacticMatches, 2 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 2 DeprecatedPredicates, 3705 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=2403, Invalid=9807, Unknown=0, NotChecked=0, Total=12210 [2021-11-13 18:31:12,648 INFO L933 BasicCegarLoop]: 220 mSDtfsCounter, 206 mSDsluCounter, 1407 mSDsCounter, 0 mSdLazyCounter, 1598 mSolverCounterSat, 1009 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3215.04ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 206 SdHoareTripleChecker+Valid, 1627 SdHoareTripleChecker+Invalid, 2839 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 17.65ms SdHoareTripleChecker+Time, 1009 IncrementalHoareTripleChecker+Valid, 1598 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 232 IncrementalHoareTripleChecker+Unchecked, 3681.85ms IncrementalHoareTripleChecker+Time [2021-11-13 18:31:12,648 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [206 Valid, 1627 Invalid, 2839 Unknown, 0 Unchecked, 17.65ms Time], IncrementalHoareTripleChecker [1009 Valid, 1598 Invalid, 0 Unknown, 232 Unchecked, 3681.85ms Time] [2021-11-13 18:31:12,650 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 804 states. [2021-11-13 18:31:12,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 804 to 656. [2021-11-13 18:31:12,996 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 656 states, 366 states have (on average 1.1967213114754098) internal successors, (438), 366 states have internal predecessors, (438), 260 states have call successors, (260), 29 states have call predecessors, (260), 29 states have return successors, (260), 260 states have call predecessors, (260), 260 states have call successors, (260) [2021-11-13 18:31:12,999 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 656 states to 656 states and 958 transitions. [2021-11-13 18:31:13,000 INFO L78 Accepts]: Start accepts. Automaton has 656 states and 958 transitions. Word has length 142 [2021-11-13 18:31:13,000 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:31:13,000 INFO L470 AbstractCegarLoop]: Abstraction has 656 states and 958 transitions. [2021-11-13 18:31:13,001 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 2.533333333333333) internal successors, (76), 30 states have internal predecessors, (76), 12 states have call successors, (42), 2 states have call predecessors, (42), 3 states have return successors, (42), 11 states have call predecessors, (42), 12 states have call successors, (42) [2021-11-13 18:31:13,001 INFO L276 IsEmpty]: Start isEmpty. Operand 656 states and 958 transitions. [2021-11-13 18:31:13,004 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2021-11-13 18:31:13,004 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:31:13,005 INFO L514 BasicCegarLoop]: trace histogram [18, 17, 17, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:31:13,030 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Ended with exit code 0 [2021-11-13 18:31:13,219 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-11-13 18:31:13,219 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:31:13,219 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:31:13,220 INFO L85 PathProgramCache]: Analyzing trace with hash -969870237, now seen corresponding path program 5 times [2021-11-13 18:31:13,220 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:31:13,220 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2103326724] [2021-11-13 18:31:13,220 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:31:13,220 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:31:13,229 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 18:31:13,229 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1643649854] [2021-11-13 18:31:13,229 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-13 18:31:13,229 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:31:13,230 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:31:13,230 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:31:13,263 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-13 18:31:13,517 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 8 check-sat command(s) [2021-11-13 18:31:13,517 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 18:31:13,519 INFO L263 TraceCheckSpWp]: Trace formula consists of 340 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-13 18:31:13,522 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:31:14,432 INFO L134 CoverageAnalysis]: Checked inductivity of 678 backedges. 116 proven. 65 refuted. 0 times theorem prover too weak. 497 trivial. 0 not checked. [2021-11-13 18:31:14,432 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:31:31,543 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:31:31,544 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2103326724] [2021-11-13 18:31:31,544 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 18:31:31,544 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1643649854] [2021-11-13 18:31:31,544 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1643649854] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 18:31:31,544 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-13 18:31:31,544 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2021-11-13 18:31:31,544 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2087598663] [2021-11-13 18:31:31,544 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-13 18:31:31,545 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-13 18:31:31,545 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:31:31,545 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-13 18:31:31,545 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=464, Unknown=5, NotChecked=0, Total=552 [2021-11-13 18:31:31,545 INFO L87 Difference]: Start difference. First operand 656 states and 958 transitions. Second operand has 17 states, 17 states have (on average 2.764705882352941) internal successors, (47), 17 states have internal predecessors, (47), 7 states have call successors, (22), 2 states have call predecessors, (22), 3 states have return successors, (21), 6 states have call predecessors, (21), 7 states have call successors, (21) [2021-11-13 18:31:33,882 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:31:33,882 INFO L93 Difference]: Finished difference Result 864 states and 1263 transitions. [2021-11-13 18:31:33,882 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-13 18:31:33,883 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.764705882352941) internal successors, (47), 17 states have internal predecessors, (47), 7 states have call successors, (22), 2 states have call predecessors, (22), 3 states have return successors, (21), 6 states have call predecessors, (21), 7 states have call successors, (21) Word has length 142 [2021-11-13 18:31:33,883 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:31:33,887 INFO L225 Difference]: With dead ends: 864 [2021-11-13 18:31:33,887 INFO L226 Difference]: Without dead ends: 762 [2021-11-13 18:31:33,888 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 233 GetRequests, 190 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 292 ImplicationChecksByTransitivity, 17.5s TimeCoverageRelationStatistics Valid=329, Invalid=1558, Unknown=5, NotChecked=0, Total=1892 [2021-11-13 18:31:33,888 INFO L933 BasicCegarLoop]: 98 mSDtfsCounter, 110 mSDsluCounter, 691 mSDsCounter, 0 mSdLazyCounter, 648 mSolverCounterSat, 164 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1018.98ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 114 SdHoareTripleChecker+Valid, 789 SdHoareTripleChecker+Invalid, 812 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.79ms SdHoareTripleChecker+Time, 164 IncrementalHoareTripleChecker+Valid, 648 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1129.97ms IncrementalHoareTripleChecker+Time [2021-11-13 18:31:33,889 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [114 Valid, 789 Invalid, 812 Unknown, 0 Unchecked, 4.79ms Time], IncrementalHoareTripleChecker [164 Valid, 648 Invalid, 0 Unknown, 0 Unchecked, 1129.97ms Time] [2021-11-13 18:31:33,890 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 762 states. [2021-11-13 18:31:34,286 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 762 to 667. [2021-11-13 18:31:34,287 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 667 states, 373 states have (on average 1.195710455764075) internal successors, (446), 373 states have internal predecessors, (446), 264 states have call successors, (264), 29 states have call predecessors, (264), 29 states have return successors, (264), 264 states have call predecessors, (264), 264 states have call successors, (264) [2021-11-13 18:31:34,291 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 667 states to 667 states and 974 transitions. [2021-11-13 18:31:34,291 INFO L78 Accepts]: Start accepts. Automaton has 667 states and 974 transitions. Word has length 142 [2021-11-13 18:31:34,292 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:31:34,292 INFO L470 AbstractCegarLoop]: Abstraction has 667 states and 974 transitions. [2021-11-13 18:31:34,292 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.764705882352941) internal successors, (47), 17 states have internal predecessors, (47), 7 states have call successors, (22), 2 states have call predecessors, (22), 3 states have return successors, (21), 6 states have call predecessors, (21), 7 states have call successors, (21) [2021-11-13 18:31:34,292 INFO L276 IsEmpty]: Start isEmpty. Operand 667 states and 974 transitions. [2021-11-13 18:31:34,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2021-11-13 18:31:34,296 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:31:34,296 INFO L514 BasicCegarLoop]: trace histogram [18, 17, 17, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:31:34,331 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-13 18:31:34,523 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-11-13 18:31:34,523 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:31:34,523 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:31:34,524 INFO L85 PathProgramCache]: Analyzing trace with hash -2005711590, now seen corresponding path program 6 times [2021-11-13 18:31:34,524 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:31:34,524 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [322466367] [2021-11-13 18:31:34,524 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:31:34,524 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:31:34,531 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 18:31:34,531 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [87182901] [2021-11-13 18:31:34,531 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-13 18:31:34,532 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:31:34,532 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:31:34,534 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:31:34,575 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-13 18:31:34,644 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-11-13 18:31:34,644 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 18:31:34,645 INFO L263 TraceCheckSpWp]: Trace formula consists of 304 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-13 18:31:34,647 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:31:35,315 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 130 proven. 55 refuted. 0 times theorem prover too weak. 505 trivial. 0 not checked. [2021-11-13 18:31:35,315 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:31:44,014 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:31:44,015 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [322466367] [2021-11-13 18:31:44,015 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 18:31:44,015 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [87182901] [2021-11-13 18:31:44,015 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [87182901] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 18:31:44,015 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-13 18:31:44,016 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2021-11-13 18:31:44,016 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [965325727] [2021-11-13 18:31:44,016 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-13 18:31:44,016 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-13 18:31:44,017 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:31:44,017 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-13 18:31:44,017 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=350, Unknown=4, NotChecked=0, Total=420 [2021-11-13 18:31:44,017 INFO L87 Difference]: Start difference. First operand 667 states and 974 transitions. Second operand has 16 states, 16 states have (on average 3.0) internal successors, (48), 16 states have internal predecessors, (48), 6 states have call successors, (18), 2 states have call predecessors, (18), 3 states have return successors, (17), 5 states have call predecessors, (17), 6 states have call successors, (17) [2021-11-13 18:31:45,464 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:31:45,464 INFO L93 Difference]: Finished difference Result 790 states and 1147 transitions. [2021-11-13 18:31:45,465 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-13 18:31:45,465 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 3.0) internal successors, (48), 16 states have internal predecessors, (48), 6 states have call successors, (18), 2 states have call predecessors, (18), 3 states have return successors, (17), 5 states have call predecessors, (17), 6 states have call successors, (17) Word has length 145 [2021-11-13 18:31:45,467 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:31:45,471 INFO L225 Difference]: With dead ends: 790 [2021-11-13 18:31:45,471 INFO L226 Difference]: Without dead ends: 665 [2021-11-13 18:31:45,472 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 207 GetRequests, 169 SyntacticMatches, 1 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 187 ImplicationChecksByTransitivity, 9.1s TimeCoverageRelationStatistics Valid=284, Invalid=1194, Unknown=4, NotChecked=0, Total=1482 [2021-11-13 18:31:45,473 INFO L933 BasicCegarLoop]: 67 mSDtfsCounter, 77 mSDsluCounter, 492 mSDsCounter, 0 mSdLazyCounter, 449 mSolverCounterSat, 92 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 464.20ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 81 SdHoareTripleChecker+Valid, 559 SdHoareTripleChecker+Invalid, 541 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.94ms SdHoareTripleChecker+Time, 92 IncrementalHoareTripleChecker+Valid, 449 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 560.99ms IncrementalHoareTripleChecker+Time [2021-11-13 18:31:45,473 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [81 Valid, 559 Invalid, 541 Unknown, 0 Unchecked, 2.94ms Time], IncrementalHoareTripleChecker [92 Valid, 449 Invalid, 0 Unknown, 0 Unchecked, 560.99ms Time] [2021-11-13 18:31:45,475 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 665 states. [2021-11-13 18:31:45,861 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 665 to 664. [2021-11-13 18:31:45,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 664 states, 370 states have (on average 1.191891891891892) internal successors, (441), 370 states have internal predecessors, (441), 264 states have call successors, (264), 29 states have call predecessors, (264), 29 states have return successors, (264), 264 states have call predecessors, (264), 264 states have call successors, (264) [2021-11-13 18:31:45,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 664 states to 664 states and 969 transitions. [2021-11-13 18:31:45,868 INFO L78 Accepts]: Start accepts. Automaton has 664 states and 969 transitions. Word has length 145 [2021-11-13 18:31:45,869 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:31:45,869 INFO L470 AbstractCegarLoop]: Abstraction has 664 states and 969 transitions. [2021-11-13 18:31:45,869 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 3.0) internal successors, (48), 16 states have internal predecessors, (48), 6 states have call successors, (18), 2 states have call predecessors, (18), 3 states have return successors, (17), 5 states have call predecessors, (17), 6 states have call successors, (17) [2021-11-13 18:31:45,870 INFO L276 IsEmpty]: Start isEmpty. Operand 664 states and 969 transitions. [2021-11-13 18:31:45,874 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2021-11-13 18:31:45,874 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:31:45,875 INFO L514 BasicCegarLoop]: trace histogram [18, 17, 17, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:31:45,914 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-11-13 18:31:46,099 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-11-13 18:31:46,099 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:31:46,099 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:31:46,100 INFO L85 PathProgramCache]: Analyzing trace with hash -1746764389, now seen corresponding path program 7 times [2021-11-13 18:31:46,100 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:31:46,100 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1687229998] [2021-11-13 18:31:46,100 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:31:46,100 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:31:46,107 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 18:31:46,107 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1146218486] [2021-11-13 18:31:46,107 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-13 18:31:46,107 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:31:46,107 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:31:46,108 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:31:46,118 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-13 18:31:46,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:31:46,178 INFO L263 TraceCheckSpWp]: Trace formula consists of 362 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-13 18:31:46,180 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:31:46,928 INFO L134 CoverageAnalysis]: Checked inductivity of 696 backedges. 132 proven. 61 refuted. 0 times theorem prover too weak. 503 trivial. 0 not checked. [2021-11-13 18:31:46,928 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:31:51,825 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:31:51,825 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1687229998] [2021-11-13 18:31:51,825 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 18:31:51,826 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1146218486] [2021-11-13 18:31:51,826 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1146218486] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 18:31:51,826 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-13 18:31:51,826 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2021-11-13 18:31:51,826 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1979294255] [2021-11-13 18:31:51,826 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-13 18:31:51,827 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-13 18:31:51,827 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:31:51,827 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-13 18:31:51,827 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=252, Unknown=2, NotChecked=0, Total=306 [2021-11-13 18:31:51,828 INFO L87 Difference]: Start difference. First operand 664 states and 969 transitions. Second operand has 14 states, 14 states have (on average 3.4285714285714284) internal successors, (48), 14 states have internal predecessors, (48), 7 states have call successors, (22), 2 states have call predecessors, (22), 3 states have return successors, (21), 6 states have call predecessors, (21), 7 states have call successors, (21) [2021-11-13 18:31:53,743 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:31:53,743 INFO L93 Difference]: Finished difference Result 935 states and 1383 transitions. [2021-11-13 18:31:53,744 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-13 18:31:53,744 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.4285714285714284) internal successors, (48), 14 states have internal predecessors, (48), 7 states have call successors, (22), 2 states have call predecessors, (22), 3 states have return successors, (21), 6 states have call predecessors, (21), 7 states have call successors, (21) Word has length 147 [2021-11-13 18:31:53,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:31:53,749 INFO L225 Difference]: With dead ends: 935 [2021-11-13 18:31:53,749 INFO L226 Difference]: Without dead ends: 833 [2021-11-13 18:31:53,750 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 224 GetRequests, 193 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=211, Invalid=779, Unknown=2, NotChecked=0, Total=992 [2021-11-13 18:31:53,751 INFO L933 BasicCegarLoop]: 71 mSDtfsCounter, 56 mSDsluCounter, 317 mSDsCounter, 0 mSdLazyCounter, 340 mSolverCounterSat, 94 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 672.35ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 388 SdHoareTripleChecker+Invalid, 434 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.78ms SdHoareTripleChecker+Time, 94 IncrementalHoareTripleChecker+Valid, 340 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 754.82ms IncrementalHoareTripleChecker+Time [2021-11-13 18:31:53,752 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [56 Valid, 388 Invalid, 434 Unknown, 0 Unchecked, 2.78ms Time], IncrementalHoareTripleChecker [94 Valid, 340 Invalid, 0 Unknown, 0 Unchecked, 754.82ms Time] [2021-11-13 18:31:53,753 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 833 states. [2021-11-13 18:31:54,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 833 to 700. [2021-11-13 18:31:54,291 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 700 states, 382 states have (on average 1.2015706806282722) internal successors, (459), 382 states have internal predecessors, (459), 288 states have call successors, (288), 29 states have call predecessors, (288), 29 states have return successors, (288), 288 states have call predecessors, (288), 288 states have call successors, (288) [2021-11-13 18:31:54,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 700 states to 700 states and 1035 transitions. [2021-11-13 18:31:54,295 INFO L78 Accepts]: Start accepts. Automaton has 700 states and 1035 transitions. Word has length 147 [2021-11-13 18:31:54,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:31:54,296 INFO L470 AbstractCegarLoop]: Abstraction has 700 states and 1035 transitions. [2021-11-13 18:31:54,296 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 3.4285714285714284) internal successors, (48), 14 states have internal predecessors, (48), 7 states have call successors, (22), 2 states have call predecessors, (22), 3 states have return successors, (21), 6 states have call predecessors, (21), 7 states have call successors, (21) [2021-11-13 18:31:54,296 INFO L276 IsEmpty]: Start isEmpty. Operand 700 states and 1035 transitions. [2021-11-13 18:31:54,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2021-11-13 18:31:54,300 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:31:54,300 INFO L514 BasicCegarLoop]: trace histogram [18, 17, 17, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:31:54,329 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-11-13 18:31:54,514 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:31:54,515 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:31:54,515 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:31:54,515 INFO L85 PathProgramCache]: Analyzing trace with hash 1560000859, now seen corresponding path program 8 times [2021-11-13 18:31:54,515 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:31:54,515 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [95479778] [2021-11-13 18:31:54,515 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:31:54,516 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:31:54,528 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 18:31:54,528 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1561471895] [2021-11-13 18:31:54,528 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-13 18:31:54,528 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:31:54,529 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:31:54,530 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:31:54,532 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-13 18:31:54,599 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-13 18:31:54,599 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 18:31:54,601 INFO L263 TraceCheckSpWp]: Trace formula consists of 362 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-13 18:31:54,604 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:31:56,131 INFO L134 CoverageAnalysis]: Checked inductivity of 696 backedges. 125 proven. 74 refuted. 0 times theorem prover too weak. 497 trivial. 0 not checked. [2021-11-13 18:31:56,132 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:32:06,259 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:32:06,259 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [95479778] [2021-11-13 18:32:06,259 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 18:32:06,259 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1561471895] [2021-11-13 18:32:06,259 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1561471895] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 18:32:06,260 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-13 18:32:06,260 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2021-11-13 18:32:06,260 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1621294010] [2021-11-13 18:32:06,260 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-13 18:32:06,260 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-13 18:32:06,260 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:32:06,261 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-13 18:32:06,261 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=509, Unknown=3, NotChecked=0, Total=600 [2021-11-13 18:32:06,262 INFO L87 Difference]: Start difference. First operand 700 states and 1035 transitions. Second operand has 18 states, 18 states have (on average 2.888888888888889) internal successors, (52), 17 states have internal predecessors, (52), 7 states have call successors, (22), 2 states have call predecessors, (22), 3 states have return successors, (21), 7 states have call predecessors, (21), 7 states have call successors, (21) [2021-11-13 18:32:10,597 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:32:10,597 INFO L93 Difference]: Finished difference Result 1117 states and 1679 transitions. [2021-11-13 18:32:10,599 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-13 18:32:10,599 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.888888888888889) internal successors, (52), 17 states have internal predecessors, (52), 7 states have call successors, (22), 2 states have call predecessors, (22), 3 states have return successors, (21), 7 states have call predecessors, (21), 7 states have call successors, (21) Word has length 147 [2021-11-13 18:32:10,599 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:32:10,606 INFO L225 Difference]: With dead ends: 1117 [2021-11-13 18:32:10,606 INFO L226 Difference]: Without dead ends: 1003 [2021-11-13 18:32:10,608 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 238 GetRequests, 194 SyntacticMatches, 1 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 252 ImplicationChecksByTransitivity, 11.4s TimeCoverageRelationStatistics Valid=413, Invalid=1564, Unknown=3, NotChecked=0, Total=1980 [2021-11-13 18:32:10,609 INFO L933 BasicCegarLoop]: 106 mSDtfsCounter, 90 mSDsluCounter, 817 mSDsCounter, 0 mSdLazyCounter, 802 mSolverCounterSat, 234 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1778.36ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 90 SdHoareTripleChecker+Valid, 923 SdHoareTripleChecker+Invalid, 1036 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 6.41ms SdHoareTripleChecker+Time, 234 IncrementalHoareTripleChecker+Valid, 802 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1982.28ms IncrementalHoareTripleChecker+Time [2021-11-13 18:32:10,609 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [90 Valid, 923 Invalid, 1036 Unknown, 0 Unchecked, 6.41ms Time], IncrementalHoareTripleChecker [234 Valid, 802 Invalid, 0 Unknown, 0 Unchecked, 1982.28ms Time] [2021-11-13 18:32:10,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1003 states. [2021-11-13 18:32:11,060 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1003 to 726. [2021-11-13 18:32:11,062 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 726 states, 400 states have (on average 1.205) internal successors, (482), 400 states have internal predecessors, (482), 296 states have call successors, (296), 29 states have call predecessors, (296), 29 states have return successors, (296), 296 states have call predecessors, (296), 296 states have call successors, (296) [2021-11-13 18:32:11,066 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 726 states to 726 states and 1074 transitions. [2021-11-13 18:32:11,066 INFO L78 Accepts]: Start accepts. Automaton has 726 states and 1074 transitions. Word has length 147 [2021-11-13 18:32:11,066 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:32:11,067 INFO L470 AbstractCegarLoop]: Abstraction has 726 states and 1074 transitions. [2021-11-13 18:32:11,067 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 2.888888888888889) internal successors, (52), 17 states have internal predecessors, (52), 7 states have call successors, (22), 2 states have call predecessors, (22), 3 states have return successors, (21), 7 states have call predecessors, (21), 7 states have call successors, (21) [2021-11-13 18:32:11,067 INFO L276 IsEmpty]: Start isEmpty. Operand 726 states and 1074 transitions. [2021-11-13 18:32:11,070 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2021-11-13 18:32:11,070 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:32:11,071 INFO L514 BasicCegarLoop]: trace histogram [18, 17, 17, 7, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:32:11,110 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2021-11-13 18:32:11,286 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-11-13 18:32:11,286 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:32:11,287 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:32:11,287 INFO L85 PathProgramCache]: Analyzing trace with hash 1592966434, now seen corresponding path program 9 times [2021-11-13 18:32:11,287 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:32:11,287 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [842349627] [2021-11-13 18:32:11,287 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:32:11,287 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:32:11,296 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 18:32:11,297 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1893829723] [2021-11-13 18:32:11,297 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 18:32:11,298 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:32:11,298 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:32:11,299 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:32:11,327 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-11-13 18:32:11,498 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-13 18:32:11,498 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 18:32:11,500 INFO L263 TraceCheckSpWp]: Trace formula consists of 296 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-13 18:32:11,504 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:32:12,682 INFO L134 CoverageAnalysis]: Checked inductivity of 710 backedges. 134 proven. 73 refuted. 0 times theorem prover too weak. 503 trivial. 0 not checked. [2021-11-13 18:32:12,682 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:32:14,226 INFO L134 CoverageAnalysis]: Checked inductivity of 710 backedges. 61 proven. 84 refuted. 0 times theorem prover too weak. 565 trivial. 0 not checked. [2021-11-13 18:32:14,226 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:32:14,227 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [842349627] [2021-11-13 18:32:14,227 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 18:32:14,227 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1893829723] [2021-11-13 18:32:14,227 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1893829723] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 18:32:14,227 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-13 18:32:14,227 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 25 [2021-11-13 18:32:14,227 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1485333909] [2021-11-13 18:32:14,227 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-13 18:32:14,228 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-13 18:32:14,228 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:32:14,229 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-13 18:32:14,229 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=516, Unknown=0, NotChecked=0, Total=600 [2021-11-13 18:32:14,229 INFO L87 Difference]: Start difference. First operand 726 states and 1074 transitions. Second operand has 25 states, 25 states have (on average 3.28) internal successors, (82), 25 states have internal predecessors, (82), 12 states have call successors, (42), 2 states have call predecessors, (42), 3 states have return successors, (42), 11 states have call predecessors, (42), 12 states have call successors, (42) [2021-11-13 18:32:19,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:32:19,998 INFO L93 Difference]: Finished difference Result 1215 states and 1819 transitions. [2021-11-13 18:32:19,999 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-11-13 18:32:19,999 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 3.28) internal successors, (82), 25 states have internal predecessors, (82), 12 states have call successors, (42), 2 states have call predecessors, (42), 3 states have return successors, (42), 11 states have call predecessors, (42), 12 states have call successors, (42) Word has length 150 [2021-11-13 18:32:19,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:32:20,004 INFO L225 Difference]: With dead ends: 1215 [2021-11-13 18:32:20,004 INFO L226 Difference]: Without dead ends: 890 [2021-11-13 18:32:20,007 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 337 GetRequests, 273 SyntacticMatches, 2 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 876 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=923, Invalid=3109, Unknown=0, NotChecked=0, Total=4032 [2021-11-13 18:32:20,007 INFO L933 BasicCegarLoop]: 80 mSDtfsCounter, 130 mSDsluCounter, 526 mSDsCounter, 0 mSdLazyCounter, 565 mSolverCounterSat, 279 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1441.39ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 130 SdHoareTripleChecker+Valid, 606 SdHoareTripleChecker+Invalid, 844 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.84ms SdHoareTripleChecker+Time, 279 IncrementalHoareTripleChecker+Valid, 565 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1584.18ms IncrementalHoareTripleChecker+Time [2021-11-13 18:32:20,008 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [130 Valid, 606 Invalid, 844 Unknown, 0 Unchecked, 4.84ms Time], IncrementalHoareTripleChecker [279 Valid, 565 Invalid, 0 Unknown, 0 Unchecked, 1584.18ms Time] [2021-11-13 18:32:20,009 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 890 states. [2021-11-13 18:32:20,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 890 to 633. [2021-11-13 18:32:20,430 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 633 states, 347 states have (on average 1.175792507204611) internal successors, (408), 347 states have internal predecessors, (408), 256 states have call successors, (256), 29 states have call predecessors, (256), 29 states have return successors, (256), 256 states have call predecessors, (256), 256 states have call successors, (256) [2021-11-13 18:32:20,432 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 633 states to 633 states and 920 transitions. [2021-11-13 18:32:20,432 INFO L78 Accepts]: Start accepts. Automaton has 633 states and 920 transitions. Word has length 150 [2021-11-13 18:32:20,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:32:20,433 INFO L470 AbstractCegarLoop]: Abstraction has 633 states and 920 transitions. [2021-11-13 18:32:20,433 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 3.28) internal successors, (82), 25 states have internal predecessors, (82), 12 states have call successors, (42), 2 states have call predecessors, (42), 3 states have return successors, (42), 11 states have call predecessors, (42), 12 states have call successors, (42) [2021-11-13 18:32:20,433 INFO L276 IsEmpty]: Start isEmpty. Operand 633 states and 920 transitions. [2021-11-13 18:32:20,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2021-11-13 18:32:20,437 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:32:20,437 INFO L514 BasicCegarLoop]: trace histogram [22, 21, 21, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:32:20,474 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Ended with exit code 0 [2021-11-13 18:32:20,663 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-11-13 18:32:20,663 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:32:20,663 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:32:20,664 INFO L85 PathProgramCache]: Analyzing trace with hash 1229225084, now seen corresponding path program 10 times [2021-11-13 18:32:20,664 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:32:20,664 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1395875305] [2021-11-13 18:32:20,664 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:32:20,664 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:32:20,673 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 18:32:20,674 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1632349439] [2021-11-13 18:32:20,674 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-13 18:32:20,674 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:32:20,674 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:32:20,675 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:32:20,682 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2021-11-13 18:32:20,751 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-13 18:32:20,751 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 18:32:20,753 INFO L263 TraceCheckSpWp]: Trace formula consists of 369 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-13 18:32:20,760 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:32:23,573 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 170 proven. 80 refuted. 0 times theorem prover too weak. 777 trivial. 0 not checked. [2021-11-13 18:32:23,574 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:32:28,721 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:32:28,721 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1395875305] [2021-11-13 18:32:28,721 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 18:32:28,722 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1632349439] [2021-11-13 18:32:28,722 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1632349439] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 18:32:28,722 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-13 18:32:28,722 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2021-11-13 18:32:28,722 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [343165578] [2021-11-13 18:32:28,722 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-13 18:32:28,723 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-13 18:32:28,723 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:32:28,723 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-13 18:32:28,724 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=133, Invalid=858, Unknown=1, NotChecked=0, Total=992 [2021-11-13 18:32:28,724 INFO L87 Difference]: Start difference. First operand 633 states and 920 transitions. Second operand has 18 states, 18 states have (on average 3.0) internal successors, (54), 17 states have internal predecessors, (54), 8 states have call successors, (26), 2 states have call predecessors, (26), 3 states have return successors, (25), 8 states have call predecessors, (25), 8 states have call successors, (25) [2021-11-13 18:32:31,414 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:32:31,414 INFO L93 Difference]: Finished difference Result 994 states and 1470 transitions. [2021-11-13 18:32:31,415 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-13 18:32:31,415 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 3.0) internal successors, (54), 17 states have internal predecessors, (54), 8 states have call successors, (26), 2 states have call predecessors, (26), 3 states have return successors, (25), 8 states have call predecessors, (25), 8 states have call successors, (25) Word has length 169 [2021-11-13 18:32:31,415 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:32:31,420 INFO L225 Difference]: With dead ends: 994 [2021-11-13 18:32:31,420 INFO L226 Difference]: Without dead ends: 880 [2021-11-13 18:32:31,422 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 331 GetRequests, 287 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 401 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=293, Invalid=1776, Unknown=1, NotChecked=0, Total=2070 [2021-11-13 18:32:31,422 INFO L933 BasicCegarLoop]: 105 mSDtfsCounter, 61 mSDsluCounter, 763 mSDsCounter, 0 mSdLazyCounter, 299 mSolverCounterSat, 88 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 783.63ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 868 SdHoareTripleChecker+Invalid, 598 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.25ms SdHoareTripleChecker+Time, 88 IncrementalHoareTripleChecker+Valid, 299 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 211 IncrementalHoareTripleChecker+Unchecked, 873.24ms IncrementalHoareTripleChecker+Time [2021-11-13 18:32:31,423 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [65 Valid, 868 Invalid, 598 Unknown, 0 Unchecked, 4.25ms Time], IncrementalHoareTripleChecker [88 Valid, 299 Invalid, 0 Unknown, 211 Unchecked, 873.24ms Time] [2021-11-13 18:32:31,424 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 880 states. [2021-11-13 18:32:31,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 880 to 704. [2021-11-13 18:32:31,916 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 704 states, 382 states have (on average 1.1806282722513088) internal successors, (451), 382 states have internal predecessors, (451), 292 states have call successors, (292), 29 states have call predecessors, (292), 29 states have return successors, (292), 292 states have call predecessors, (292), 292 states have call successors, (292) [2021-11-13 18:32:31,919 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 704 states to 704 states and 1035 transitions. [2021-11-13 18:32:31,919 INFO L78 Accepts]: Start accepts. Automaton has 704 states and 1035 transitions. Word has length 169 [2021-11-13 18:32:31,920 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:32:31,920 INFO L470 AbstractCegarLoop]: Abstraction has 704 states and 1035 transitions. [2021-11-13 18:32:31,920 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 3.0) internal successors, (54), 17 states have internal predecessors, (54), 8 states have call successors, (26), 2 states have call predecessors, (26), 3 states have return successors, (25), 8 states have call predecessors, (25), 8 states have call successors, (25) [2021-11-13 18:32:31,920 INFO L276 IsEmpty]: Start isEmpty. Operand 704 states and 1035 transitions. [2021-11-13 18:32:31,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 173 [2021-11-13 18:32:31,925 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:32:31,925 INFO L514 BasicCegarLoop]: trace histogram [22, 21, 21, 7, 6, 6, 6, 6, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:32:31,972 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2021-11-13 18:32:32,139 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-11-13 18:32:32,139 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:32:32,140 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:32:32,140 INFO L85 PathProgramCache]: Analyzing trace with hash -1583420777, now seen corresponding path program 11 times [2021-11-13 18:32:32,140 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:32:32,140 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [628287254] [2021-11-13 18:32:32,140 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:32:32,140 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:32:32,155 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 18:32:32,155 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1061933091] [2021-11-13 18:32:32,155 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-13 18:32:32,155 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:32:32,156 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:32:32,157 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:32:32,179 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2021-11-13 18:32:32,501 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2021-11-13 18:32:32,501 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 18:32:32,505 INFO L263 TraceCheckSpWp]: Trace formula consists of 410 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-13 18:32:32,509 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:32:34,114 INFO L134 CoverageAnalysis]: Checked inductivity of 1041 backedges. 174 proven. 88 refuted. 0 times theorem prover too weak. 779 trivial. 0 not checked. [2021-11-13 18:32:34,114 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:32:36,365 INFO L134 CoverageAnalysis]: Checked inductivity of 1041 backedges. 99 proven. 85 refuted. 0 times theorem prover too weak. 857 trivial. 0 not checked. [2021-11-13 18:32:36,365 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:32:36,366 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [628287254] [2021-11-13 18:32:36,366 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 18:32:36,366 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1061933091] [2021-11-13 18:32:36,366 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1061933091] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 18:32:36,366 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-13 18:32:36,366 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 31 [2021-11-13 18:32:36,366 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [6688829] [2021-11-13 18:32:36,367 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-13 18:32:36,368 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-13 18:32:36,368 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:32:36,368 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-13 18:32:36,369 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=841, Unknown=0, NotChecked=0, Total=930 [2021-11-13 18:32:36,369 INFO L87 Difference]: Start difference. First operand 704 states and 1035 transitions. Second operand has 31 states, 31 states have (on average 2.870967741935484) internal successors, (89), 29 states have internal predecessors, (89), 14 states have call successors, (49), 2 states have call predecessors, (49), 3 states have return successors, (49), 14 states have call predecessors, (49), 14 states have call successors, (49) [2021-11-13 18:32:52,788 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:32:52,788 INFO L93 Difference]: Finished difference Result 1250 states and 1917 transitions. [2021-11-13 18:32:52,789 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2021-11-13 18:32:52,789 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 2.870967741935484) internal successors, (89), 29 states have internal predecessors, (89), 14 states have call successors, (49), 2 states have call predecessors, (49), 3 states have return successors, (49), 14 states have call predecessors, (49), 14 states have call successors, (49) Word has length 172 [2021-11-13 18:32:52,790 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:32:52,796 INFO L225 Difference]: With dead ends: 1250 [2021-11-13 18:32:52,796 INFO L226 Difference]: Without dead ends: 993 [2021-11-13 18:32:52,801 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 400 GetRequests, 313 SyntacticMatches, 0 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1679 ImplicationChecksByTransitivity, 10.7s TimeCoverageRelationStatistics Valid=1582, Invalid=6250, Unknown=0, NotChecked=0, Total=7832 [2021-11-13 18:32:52,802 INFO L933 BasicCegarLoop]: 167 mSDtfsCounter, 207 mSDsluCounter, 1353 mSDsCounter, 0 mSdLazyCounter, 2025 mSolverCounterSat, 946 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6077.28ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 207 SdHoareTripleChecker+Valid, 1520 SdHoareTripleChecker+Invalid, 2971 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 17.70ms SdHoareTripleChecker+Time, 946 IncrementalHoareTripleChecker+Valid, 2025 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6697.33ms IncrementalHoareTripleChecker+Time [2021-11-13 18:32:52,802 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [207 Valid, 1520 Invalid, 2971 Unknown, 0 Unchecked, 17.70ms Time], IncrementalHoareTripleChecker [946 Valid, 2025 Invalid, 0 Unknown, 0 Unchecked, 6697.33ms Time] [2021-11-13 18:32:52,804 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 993 states. [2021-11-13 18:32:53,279 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 993 to 706. [2021-11-13 18:32:53,279 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 706 states, 384 states have (on average 1.1692708333333333) internal successors, (449), 384 states have internal predecessors, (449), 292 states have call successors, (292), 29 states have call predecessors, (292), 29 states have return successors, (292), 292 states have call predecessors, (292), 292 states have call successors, (292) [2021-11-13 18:32:53,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 706 states to 706 states and 1033 transitions. [2021-11-13 18:32:53,283 INFO L78 Accepts]: Start accepts. Automaton has 706 states and 1033 transitions. Word has length 172 [2021-11-13 18:32:53,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:32:53,283 INFO L470 AbstractCegarLoop]: Abstraction has 706 states and 1033 transitions. [2021-11-13 18:32:53,283 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 2.870967741935484) internal successors, (89), 29 states have internal predecessors, (89), 14 states have call successors, (49), 2 states have call predecessors, (49), 3 states have return successors, (49), 14 states have call predecessors, (49), 14 states have call successors, (49) [2021-11-13 18:32:53,283 INFO L276 IsEmpty]: Start isEmpty. Operand 706 states and 1033 transitions. [2021-11-13 18:32:53,288 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 195 [2021-11-13 18:32:53,288 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:32:53,288 INFO L514 BasicCegarLoop]: trace histogram [26, 25, 25, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:32:53,324 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2021-11-13 18:32:53,515 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-11-13 18:32:53,515 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:32:53,515 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:32:53,516 INFO L85 PathProgramCache]: Analyzing trace with hash 725200130, now seen corresponding path program 12 times [2021-11-13 18:32:53,516 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:32:53,516 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [258086397] [2021-11-13 18:32:53,516 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:32:53,516 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:32:53,535 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 18:32:53,535 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [364833228] [2021-11-13 18:32:53,535 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-13 18:32:53,535 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:32:53,536 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:32:53,536 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:32:53,542 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2021-11-13 18:32:53,703 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 9 check-sat command(s) [2021-11-13 18:32:53,703 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 18:32:53,705 INFO L263 TraceCheckSpWp]: Trace formula consists of 452 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-13 18:32:53,708 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:32:55,268 INFO L134 CoverageAnalysis]: Checked inductivity of 1442 backedges. 193 proven. 122 refuted. 0 times theorem prover too weak. 1127 trivial. 0 not checked. [2021-11-13 18:32:55,269 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:32:56,979 INFO L134 CoverageAnalysis]: Checked inductivity of 1442 backedges. 88 proven. 133 refuted. 0 times theorem prover too weak. 1221 trivial. 0 not checked. [2021-11-13 18:32:56,979 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:32:56,979 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [258086397] [2021-11-13 18:32:56,979 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 18:32:56,979 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [364833228] [2021-11-13 18:32:56,980 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [364833228] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 18:32:56,980 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-13 18:32:56,980 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 24 [2021-11-13 18:32:56,980 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [131174182] [2021-11-13 18:32:56,980 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-13 18:32:56,981 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-13 18:32:56,981 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:32:56,981 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-13 18:32:56,981 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=472, Unknown=0, NotChecked=0, Total=552 [2021-11-13 18:32:56,982 INFO L87 Difference]: Start difference. First operand 706 states and 1033 transitions. Second operand has 24 states, 24 states have (on average 3.1666666666666665) internal successors, (76), 24 states have internal predecessors, (76), 15 states have call successors, (54), 2 states have call predecessors, (54), 3 states have return successors, (54), 14 states have call predecessors, (54), 15 states have call successors, (54) [2021-11-13 18:33:06,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:33:06,113 INFO L93 Difference]: Finished difference Result 1393 states and 2117 transitions. [2021-11-13 18:33:06,114 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-11-13 18:33:06,114 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 3.1666666666666665) internal successors, (76), 24 states have internal predecessors, (76), 15 states have call successors, (54), 2 states have call predecessors, (54), 3 states have return successors, (54), 14 states have call predecessors, (54), 15 states have call successors, (54) Word has length 194 [2021-11-13 18:33:06,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:33:06,121 INFO L225 Difference]: With dead ends: 1393 [2021-11-13 18:33:06,121 INFO L226 Difference]: Without dead ends: 1183 [2021-11-13 18:33:06,122 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 429 GetRequests, 363 SyntacticMatches, 1 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 982 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=919, Invalid=3503, Unknown=0, NotChecked=0, Total=4422 [2021-11-13 18:33:06,123 INFO L933 BasicCegarLoop]: 112 mSDtfsCounter, 83 mSDsluCounter, 1041 mSDsCounter, 0 mSdLazyCounter, 986 mSolverCounterSat, 287 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2624.80ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 83 SdHoareTripleChecker+Valid, 1153 SdHoareTripleChecker+Invalid, 1273 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 8.32ms SdHoareTripleChecker+Time, 287 IncrementalHoareTripleChecker+Valid, 986 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2917.71ms IncrementalHoareTripleChecker+Time [2021-11-13 18:33:06,124 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [83 Valid, 1153 Invalid, 1273 Unknown, 0 Unchecked, 8.32ms Time], IncrementalHoareTripleChecker [287 Valid, 986 Invalid, 0 Unknown, 0 Unchecked, 2917.71ms Time] [2021-11-13 18:33:06,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1183 states. [2021-11-13 18:33:06,831 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1183 to 946. [2021-11-13 18:33:06,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 946 states, 500 states have (on average 1.172) internal successors, (586), 500 states have internal predecessors, (586), 416 states have call successors, (416), 29 states have call predecessors, (416), 29 states have return successors, (416), 416 states have call predecessors, (416), 416 states have call successors, (416) [2021-11-13 18:33:06,835 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 946 states to 946 states and 1418 transitions. [2021-11-13 18:33:06,836 INFO L78 Accepts]: Start accepts. Automaton has 946 states and 1418 transitions. Word has length 194 [2021-11-13 18:33:06,836 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:33:06,836 INFO L470 AbstractCegarLoop]: Abstraction has 946 states and 1418 transitions. [2021-11-13 18:33:06,836 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 3.1666666666666665) internal successors, (76), 24 states have internal predecessors, (76), 15 states have call successors, (54), 2 states have call predecessors, (54), 3 states have return successors, (54), 14 states have call predecessors, (54), 15 states have call successors, (54) [2021-11-13 18:33:06,836 INFO L276 IsEmpty]: Start isEmpty. Operand 946 states and 1418 transitions. [2021-11-13 18:33:06,840 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 215 [2021-11-13 18:33:06,840 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:33:06,841 INFO L514 BasicCegarLoop]: trace histogram [30, 29, 29, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 5, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:33:06,867 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2021-11-13 18:33:07,041 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:33:07,041 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:33:07,042 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:33:07,042 INFO L85 PathProgramCache]: Analyzing trace with hash -182135966, now seen corresponding path program 13 times [2021-11-13 18:33:07,042 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:33:07,042 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1459775518] [2021-11-13 18:33:07,042 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:33:07,042 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:33:07,050 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 18:33:07,050 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [94696180] [2021-11-13 18:33:07,050 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-13 18:33:07,050 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:33:07,051 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:33:07,052 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:33:07,053 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-11-13 18:33:07,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:33:07,171 INFO L263 TraceCheckSpWp]: Trace formula consists of 478 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-13 18:33:07,176 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:33:07,941 INFO L134 CoverageAnalysis]: Checked inductivity of 1908 backedges. 1006 proven. 18 refuted. 0 times theorem prover too weak. 884 trivial. 0 not checked. [2021-11-13 18:33:07,941 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:33:08,579 INFO L134 CoverageAnalysis]: Checked inductivity of 1908 backedges. 200 proven. 18 refuted. 0 times theorem prover too weak. 1690 trivial. 0 not checked. [2021-11-13 18:33:08,579 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:33:08,579 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1459775518] [2021-11-13 18:33:08,579 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 18:33:08,579 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [94696180] [2021-11-13 18:33:08,580 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [94696180] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 18:33:08,580 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-13 18:33:08,580 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2021-11-13 18:33:08,580 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [561580336] [2021-11-13 18:33:08,580 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-13 18:33:08,581 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-13 18:33:08,581 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:33:08,581 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-13 18:33:08,581 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2021-11-13 18:33:08,581 INFO L87 Difference]: Start difference. First operand 946 states and 1418 transitions. Second operand has 8 states, 8 states have (on average 5.75) internal successors, (46), 8 states have internal predecessors, (46), 5 states have call successors, (28), 2 states have call predecessors, (28), 2 states have return successors, (28), 5 states have call predecessors, (28), 5 states have call successors, (28) [2021-11-13 18:33:09,898 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:33:09,898 INFO L93 Difference]: Finished difference Result 1598 states and 2391 transitions. [2021-11-13 18:33:09,899 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-13 18:33:09,899 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 5.75) internal successors, (46), 8 states have internal predecessors, (46), 5 states have call successors, (28), 2 states have call predecessors, (28), 2 states have return successors, (28), 5 states have call predecessors, (28), 5 states have call successors, (28) Word has length 214 [2021-11-13 18:33:09,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:33:09,907 INFO L225 Difference]: With dead ends: 1598 [2021-11-13 18:33:09,908 INFO L226 Difference]: Without dead ends: 899 [2021-11-13 18:33:09,911 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 430 GetRequests, 418 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2021-11-13 18:33:09,912 INFO L933 BasicCegarLoop]: 60 mSDtfsCounter, 9 mSDsluCounter, 239 mSDsCounter, 0 mSdLazyCounter, 147 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 317.95ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 299 SdHoareTripleChecker+Invalid, 163 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.41ms SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 147 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 372.98ms IncrementalHoareTripleChecker+Time [2021-11-13 18:33:09,913 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 299 Invalid, 163 Unknown, 0 Unchecked, 1.41ms Time], IncrementalHoareTripleChecker [16 Valid, 147 Invalid, 0 Unknown, 0 Unchecked, 372.98ms Time] [2021-11-13 18:33:09,914 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 899 states. [2021-11-13 18:33:10,695 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 899 to 806. [2021-11-13 18:33:10,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 806 states, 416 states have (on average 1.1802884615384615) internal successors, (491), 418 states have internal predecessors, (491), 364 states have call successors, (364), 25 states have call predecessors, (364), 25 states have return successors, (364), 362 states have call predecessors, (364), 364 states have call successors, (364) [2021-11-13 18:33:10,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 806 states to 806 states and 1219 transitions. [2021-11-13 18:33:10,699 INFO L78 Accepts]: Start accepts. Automaton has 806 states and 1219 transitions. Word has length 214 [2021-11-13 18:33:10,700 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:33:10,700 INFO L470 AbstractCegarLoop]: Abstraction has 806 states and 1219 transitions. [2021-11-13 18:33:10,700 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 5.75) internal successors, (46), 8 states have internal predecessors, (46), 5 states have call successors, (28), 2 states have call predecessors, (28), 2 states have return successors, (28), 5 states have call predecessors, (28), 5 states have call successors, (28) [2021-11-13 18:33:10,700 INFO L276 IsEmpty]: Start isEmpty. Operand 806 states and 1219 transitions. [2021-11-13 18:33:10,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 242 [2021-11-13 18:33:10,704 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:33:10,704 INFO L514 BasicCegarLoop]: trace histogram [34, 33, 33, 9, 9, 9, 9, 8, 8, 8, 8, 8, 8, 5, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:33:10,730 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2021-11-13 18:33:10,907 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2021-11-13 18:33:10,907 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:33:10,908 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:33:10,908 INFO L85 PathProgramCache]: Analyzing trace with hash 1597388697, now seen corresponding path program 14 times [2021-11-13 18:33:10,908 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:33:10,908 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1493988455] [2021-11-13 18:33:10,908 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:33:10,908 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:33:10,918 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 18:33:10,918 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1363725927] [2021-11-13 18:33:10,919 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-13 18:33:10,919 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:33:10,919 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:33:10,920 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:33:10,926 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2021-11-13 18:33:11,019 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-13 18:33:11,019 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 18:33:11,022 INFO L263 TraceCheckSpWp]: Trace formula consists of 542 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-13 18:33:11,025 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:33:11,972 INFO L134 CoverageAnalysis]: Checked inductivity of 2471 backedges. 1083 proven. 60 refuted. 0 times theorem prover too weak. 1328 trivial. 0 not checked. [2021-11-13 18:33:11,972 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:33:12,914 INFO L134 CoverageAnalysis]: Checked inductivity of 2471 backedges. 237 proven. 60 refuted. 0 times theorem prover too weak. 2174 trivial. 0 not checked. [2021-11-13 18:33:12,914 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:33:12,915 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1493988455] [2021-11-13 18:33:12,915 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 18:33:12,915 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1363725927] [2021-11-13 18:33:12,915 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1363725927] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 18:33:12,915 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-13 18:33:12,916 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 11 [2021-11-13 18:33:12,916 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [814532641] [2021-11-13 18:33:12,916 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-13 18:33:12,916 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-13 18:33:12,917 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:33:12,917 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-13 18:33:12,917 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2021-11-13 18:33:12,917 INFO L87 Difference]: Start difference. First operand 806 states and 1219 transitions. Second operand has 11 states, 11 states have (on average 4.7272727272727275) internal successors, (52), 11 states have internal predecessors, (52), 8 states have call successors, (40), 2 states have call predecessors, (40), 2 states have return successors, (40), 8 states have call predecessors, (40), 8 states have call successors, (40) [2021-11-13 18:33:15,625 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:33:15,625 INFO L93 Difference]: Finished difference Result 1725 states and 2644 transitions. [2021-11-13 18:33:15,627 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-13 18:33:15,627 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 4.7272727272727275) internal successors, (52), 11 states have internal predecessors, (52), 8 states have call successors, (40), 2 states have call predecessors, (40), 2 states have return successors, (40), 8 states have call predecessors, (40), 8 states have call successors, (40) Word has length 241 [2021-11-13 18:33:15,627 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:33:15,633 INFO L225 Difference]: With dead ends: 1725 [2021-11-13 18:33:15,634 INFO L226 Difference]: Without dead ends: 1085 [2021-11-13 18:33:15,636 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 489 GetRequests, 469 SyntacticMatches, 3 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=97, Invalid=245, Unknown=0, NotChecked=0, Total=342 [2021-11-13 18:33:15,637 INFO L933 BasicCegarLoop]: 81 mSDtfsCounter, 26 mSDsluCounter, 358 mSDsCounter, 0 mSdLazyCounter, 268 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1072.86ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 439 SdHoareTripleChecker+Invalid, 305 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.36ms SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 268 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1170.69ms IncrementalHoareTripleChecker+Time [2021-11-13 18:33:15,638 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 439 Invalid, 305 Unknown, 0 Unchecked, 2.36ms Time], IncrementalHoareTripleChecker [37 Valid, 268 Invalid, 0 Unknown, 0 Unchecked, 1170.69ms Time] [2021-11-13 18:33:15,639 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1085 states. [2021-11-13 18:33:16,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1085 to 979. [2021-11-13 18:33:16,522 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 979 states, 485 states have (on average 1.1917525773195876) internal successors, (578), 488 states have internal predecessors, (578), 468 states have call successors, (468), 25 states have call predecessors, (468), 25 states have return successors, (468), 465 states have call predecessors, (468), 468 states have call successors, (468) [2021-11-13 18:33:16,527 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 979 states to 979 states and 1514 transitions. [2021-11-13 18:33:16,528 INFO L78 Accepts]: Start accepts. Automaton has 979 states and 1514 transitions. Word has length 241 [2021-11-13 18:33:16,528 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:33:16,528 INFO L470 AbstractCegarLoop]: Abstraction has 979 states and 1514 transitions. [2021-11-13 18:33:16,529 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 4.7272727272727275) internal successors, (52), 11 states have internal predecessors, (52), 8 states have call successors, (40), 2 states have call predecessors, (40), 2 states have return successors, (40), 8 states have call predecessors, (40), 8 states have call successors, (40) [2021-11-13 18:33:16,529 INFO L276 IsEmpty]: Start isEmpty. Operand 979 states and 1514 transitions. [2021-11-13 18:33:16,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 264 [2021-11-13 18:33:16,534 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:33:16,534 INFO L514 BasicCegarLoop]: trace histogram [38, 37, 37, 10, 10, 10, 10, 9, 9, 9, 9, 9, 8, 5, 5, 4, 4, 4, 4, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:33:16,577 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Ended with exit code 0 [2021-11-13 18:33:16,759 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2021-11-13 18:33:16,759 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:33:16,759 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:33:16,760 INFO L85 PathProgramCache]: Analyzing trace with hash 414525242, now seen corresponding path program 15 times [2021-11-13 18:33:16,760 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:33:16,760 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1381541763] [2021-11-13 18:33:16,760 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:33:16,760 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:33:16,773 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 18:33:16,779 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [64789435] [2021-11-13 18:33:16,779 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 18:33:16,779 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:33:16,780 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:33:16,781 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:33:16,789 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2021-11-13 18:33:17,019 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-13 18:33:17,019 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 18:33:17,022 INFO L263 TraceCheckSpWp]: Trace formula consists of 296 conjuncts, 90 conjunts are in the unsatisfiable core [2021-11-13 18:33:17,029 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:33:26,278 INFO L134 CoverageAnalysis]: Checked inductivity of 3082 backedges. 212 proven. 169 refuted. 0 times theorem prover too weak. 2701 trivial. 0 not checked. [2021-11-13 18:33:26,278 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:37:37,037 WARN L860 $PredicateComparison]: unable to prove that (and (not (= |c___VERIFIER_assert_#in~cond| 0)) (or (not (= |c___VERIFIER_assert_#in~cond| 1)) (forall ((|v_ULTIMATE.start_main_~b~0#1_BEFORE_CALL_505| Int) (|v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_81| Int)) (or (= |v_ULTIMATE.start_main_~b~0#1_BEFORE_CALL_505| 0) (= (mod (* (* (- 1) |v_ULTIMATE.start_main_~b~0#1_BEFORE_CALL_505| |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_81|) (- 1)) |v_ULTIMATE.start_main_~b~0#1_BEFORE_CALL_505|) 0))))) is different from true [2021-11-13 18:37:55,133 WARN L860 $PredicateComparison]: unable to prove that (or (and (not (= |c___VERIFIER_assert_#in~cond| 0)) (or (not (= |c___VERIFIER_assert_#in~cond| 1)) (forall ((|v_ULTIMATE.start_main_~b~0#1_BEFORE_CALL_505| Int) (|v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_81| Int)) (or (= |v_ULTIMATE.start_main_~b~0#1_BEFORE_CALL_505| 0) (= (mod (* (* (- 1) |v_ULTIMATE.start_main_~b~0#1_BEFORE_CALL_505| |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_81|) (- 1)) |v_ULTIMATE.start_main_~b~0#1_BEFORE_CALL_505|) 0))))) (= c___VERIFIER_assert_~cond 0)) is different from true [2021-11-13 18:38:05,190 WARN L860 $PredicateComparison]: unable to prove that (or (not (= |c___VERIFIER_assert_#in~cond| 1)) (forall ((|v_ULTIMATE.start_main_~b~0#1_BEFORE_CALL_505| Int) (|v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_81| Int)) (or (= |v_ULTIMATE.start_main_~b~0#1_BEFORE_CALL_505| 0) (= (mod (* (* (- 1) |v_ULTIMATE.start_main_~b~0#1_BEFORE_CALL_505| |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_81|) (- 1)) |v_ULTIMATE.start_main_~b~0#1_BEFORE_CALL_505|) 0)))) is different from true [2021-11-13 18:38:15,276 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:38:15,276 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1381541763] [2021-11-13 18:38:15,277 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 18:38:15,277 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [64789435] [2021-11-13 18:38:15,277 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [64789435] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 18:38:15,277 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-13 18:38:15,277 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2021-11-13 18:38:15,277 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1292566686] [2021-11-13 18:38:15,277 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-13 18:38:15,278 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-13 18:38:15,278 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:38:15,278 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-13 18:38:15,278 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=810, Unknown=7, NotChecked=180, Total=1122 [2021-11-13 18:38:15,279 INFO L87 Difference]: Start difference. First operand 979 states and 1514 transitions. Second operand has 24 states, 23 states have (on average 2.347826086956522) internal successors, (54), 21 states have internal predecessors, (54), 7 states have call successors, (18), 2 states have call predecessors, (18), 3 states have return successors, (17), 8 states have call predecessors, (17), 7 states have call successors, (17) [2021-11-13 18:38:24,427 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:38:24,427 INFO L93 Difference]: Finished difference Result 1445 states and 2246 transitions. [2021-11-13 18:38:24,428 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-13 18:38:24,428 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 2.347826086956522) internal successors, (54), 21 states have internal predecessors, (54), 7 states have call successors, (18), 2 states have call predecessors, (18), 3 states have return successors, (17), 8 states have call predecessors, (17), 7 states have call successors, (17) Word has length 263 [2021-11-13 18:38:24,429 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:38:24,437 INFO L225 Difference]: With dead ends: 1445 [2021-11-13 18:38:24,437 INFO L226 Difference]: Without dead ends: 1443 [2021-11-13 18:38:24,438 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 319 GetRequests, 274 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 3 IntricatePredicates, 0 DeprecatedPredicates, 369 ImplicationChecksByTransitivity, 24.4s TimeCoverageRelationStatistics Valid=228, Invalid=1583, Unknown=7, NotChecked=252, Total=2070 [2021-11-13 18:38:24,438 INFO L933 BasicCegarLoop]: 44 mSDtfsCounter, 115 mSDsluCounter, 504 mSDsCounter, 0 mSdLazyCounter, 1253 mSolverCounterSat, 89 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3373.69ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 132 SdHoareTripleChecker+Valid, 548 SdHoareTripleChecker+Invalid, 1342 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 7.80ms SdHoareTripleChecker+Time, 89 IncrementalHoareTripleChecker+Valid, 1253 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3656.83ms IncrementalHoareTripleChecker+Time [2021-11-13 18:38:24,438 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [132 Valid, 548 Invalid, 1342 Unknown, 0 Unchecked, 7.80ms Time], IncrementalHoareTripleChecker [89 Valid, 1253 Invalid, 0 Unknown, 0 Unchecked, 3656.83ms Time] [2021-11-13 18:38:24,440 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1443 states. [2021-11-13 18:38:25,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1443 to 1422. [2021-11-13 18:38:25,709 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1422 states, 699 states have (on average 1.1974248927038627) internal successors, (837), 704 states have internal predecessors, (837), 692 states have call successors, (692), 30 states have call predecessors, (692), 30 states have return successors, (692), 687 states have call predecessors, (692), 692 states have call successors, (692) [2021-11-13 18:38:25,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1422 states to 1422 states and 2221 transitions. [2021-11-13 18:38:25,716 INFO L78 Accepts]: Start accepts. Automaton has 1422 states and 2221 transitions. Word has length 263 [2021-11-13 18:38:25,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:38:25,716 INFO L470 AbstractCegarLoop]: Abstraction has 1422 states and 2221 transitions. [2021-11-13 18:38:25,716 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 2.347826086956522) internal successors, (54), 21 states have internal predecessors, (54), 7 states have call successors, (18), 2 states have call predecessors, (18), 3 states have return successors, (17), 8 states have call predecessors, (17), 7 states have call successors, (17) [2021-11-13 18:38:25,717 INFO L276 IsEmpty]: Start isEmpty. Operand 1422 states and 2221 transitions. [2021-11-13 18:38:25,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 281 [2021-11-13 18:38:25,722 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:38:25,722 INFO L514 BasicCegarLoop]: trace histogram [42, 41, 41, 11, 11, 11, 11, 10, 10, 10, 10, 10, 7, 6, 5, 4, 4, 4, 4, 4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:38:25,771 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Ended with exit code 0 [2021-11-13 18:38:25,939 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:38:25,939 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:38:25,939 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:38:25,940 INFO L85 PathProgramCache]: Analyzing trace with hash -1069394717, now seen corresponding path program 16 times [2021-11-13 18:38:25,940 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:38:25,940 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [917834535] [2021-11-13 18:38:25,940 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:38:25,940 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:38:25,946 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 18:38:25,947 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1036916126] [2021-11-13 18:38:25,947 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-13 18:38:25,947 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:38:25,947 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:38:25,964 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:38:25,982 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2021-11-13 18:38:26,082 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-13 18:38:26,082 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 18:38:26,086 INFO L263 TraceCheckSpWp]: Trace formula consists of 569 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-13 18:38:26,093 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:38:37,097 INFO L134 CoverageAnalysis]: Checked inductivity of 3741 backedges. 298 proven. 304 refuted. 0 times theorem prover too weak. 3139 trivial. 0 not checked. [2021-11-13 18:38:37,097 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:38:42,725 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:38:42,726 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [917834535] [2021-11-13 18:38:42,726 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 18:38:42,726 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1036916126] [2021-11-13 18:38:42,726 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1036916126] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 18:38:42,726 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-13 18:38:42,726 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2021-11-13 18:38:42,726 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [779496046] [2021-11-13 18:38:42,726 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-13 18:38:42,727 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-13 18:38:42,727 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:38:42,727 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-13 18:38:42,727 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=1068, Unknown=0, NotChecked=0, Total=1260 [2021-11-13 18:38:42,727 INFO L87 Difference]: Start difference. First operand 1422 states and 2221 transitions. Second operand has 22 states, 22 states have (on average 2.909090909090909) internal successors, (64), 22 states have internal predecessors, (64), 13 states have call successors, (46), 2 states have call predecessors, (46), 3 states have return successors, (45), 12 states have call predecessors, (45), 13 states have call successors, (45) [2021-11-13 18:38:55,157 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:38:55,157 INFO L93 Difference]: Finished difference Result 1999 states and 3141 transitions. [2021-11-13 18:38:55,158 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-13 18:38:55,158 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.909090909090909) internal successors, (64), 22 states have internal predecessors, (64), 13 states have call successors, (46), 2 states have call predecessors, (46), 3 states have return successors, (45), 12 states have call predecessors, (45), 13 states have call successors, (45) Word has length 280 [2021-11-13 18:38:55,158 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:38:55,168 INFO L225 Difference]: With dead ends: 1999 [2021-11-13 18:38:55,168 INFO L226 Difference]: Without dead ends: 1830 [2021-11-13 18:38:55,170 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 514 GetRequests, 456 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 675 ImplicationChecksByTransitivity, 12.7s TimeCoverageRelationStatistics Valid=545, Invalid=2995, Unknown=0, NotChecked=0, Total=3540 [2021-11-13 18:38:55,170 INFO L933 BasicCegarLoop]: 121 mSDtfsCounter, 122 mSDsluCounter, 896 mSDsCounter, 0 mSdLazyCounter, 767 mSolverCounterSat, 219 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2824.89ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 126 SdHoareTripleChecker+Valid, 1017 SdHoareTripleChecker+Invalid, 1109 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 6.87ms SdHoareTripleChecker+Time, 219 IncrementalHoareTripleChecker+Valid, 767 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 123 IncrementalHoareTripleChecker+Unchecked, 3114.34ms IncrementalHoareTripleChecker+Time [2021-11-13 18:38:55,171 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [126 Valid, 1017 Invalid, 1109 Unknown, 0 Unchecked, 6.87ms Time], IncrementalHoareTripleChecker [219 Valid, 767 Invalid, 0 Unknown, 123 Unchecked, 3114.34ms Time] [2021-11-13 18:38:55,172 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1830 states. [2021-11-13 18:38:56,506 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1830 to 1484. [2021-11-13 18:38:56,507 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1484 states, 729 states have (on average 1.1934156378600822) internal successors, (870), 734 states have internal predecessors, (870), 724 states have call successors, (724), 30 states have call predecessors, (724), 30 states have return successors, (724), 719 states have call predecessors, (724), 724 states have call successors, (724) [2021-11-13 18:38:56,511 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1484 states to 1484 states and 2318 transitions. [2021-11-13 18:38:56,511 INFO L78 Accepts]: Start accepts. Automaton has 1484 states and 2318 transitions. Word has length 280 [2021-11-13 18:38:56,511 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:38:56,511 INFO L470 AbstractCegarLoop]: Abstraction has 1484 states and 2318 transitions. [2021-11-13 18:38:56,512 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 2.909090909090909) internal successors, (64), 22 states have internal predecessors, (64), 13 states have call successors, (46), 2 states have call predecessors, (46), 3 states have return successors, (45), 12 states have call predecessors, (45), 13 states have call successors, (45) [2021-11-13 18:38:56,512 INFO L276 IsEmpty]: Start isEmpty. Operand 1484 states and 2318 transitions. [2021-11-13 18:38:56,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 286 [2021-11-13 18:38:56,518 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:38:56,518 INFO L514 BasicCegarLoop]: trace histogram [42, 41, 41, 11, 11, 11, 11, 10, 10, 10, 10, 10, 8, 6, 5, 4, 4, 4, 4, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:38:56,541 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2021-11-13 18:38:56,718 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:38:56,718 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:38:56,719 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:38:56,719 INFO L85 PathProgramCache]: Analyzing trace with hash 1024312283, now seen corresponding path program 17 times [2021-11-13 18:38:56,719 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:38:56,719 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [301545235] [2021-11-13 18:38:56,720 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:38:56,720 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:38:56,727 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 18:38:56,727 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [415612243] [2021-11-13 18:38:56,727 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-13 18:38:56,727 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:38:56,728 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:38:56,728 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:38:56,733 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2021-11-13 18:38:57,140 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 19 check-sat command(s) [2021-11-13 18:38:57,140 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 18:38:57,145 INFO L263 TraceCheckSpWp]: Trace formula consists of 626 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-13 18:38:57,150 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:39:00,370 INFO L134 CoverageAnalysis]: Checked inductivity of 3763 backedges. 1399 proven. 184 refuted. 0 times theorem prover too weak. 2180 trivial. 0 not checked. [2021-11-13 18:39:00,370 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:39:10,571 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:39:10,572 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [301545235] [2021-11-13 18:39:10,572 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 18:39:10,572 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [415612243] [2021-11-13 18:39:10,572 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [415612243] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 18:39:10,572 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-13 18:39:10,572 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2021-11-13 18:39:10,572 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [263617769] [2021-11-13 18:39:10,573 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-13 18:39:10,573 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-11-13 18:39:10,573 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:39:10,574 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-11-13 18:39:10,574 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=1013, Unknown=2, NotChecked=0, Total=1190 [2021-11-13 18:39:10,574 INFO L87 Difference]: Start difference. First operand 1484 states and 2318 transitions. Second operand has 21 states, 21 states have (on average 3.0) internal successors, (63), 20 states have internal predecessors, (63), 11 states have call successors, (40), 2 states have call predecessors, (40), 3 states have return successors, (40), 11 states have call predecessors, (40), 11 states have call successors, (40) [2021-11-13 18:39:17,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:39:17,288 INFO L93 Difference]: Finished difference Result 2200 states and 3453 transitions. [2021-11-13 18:39:17,288 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-13 18:39:17,289 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 3.0) internal successors, (63), 20 states have internal predecessors, (63), 11 states have call successors, (40), 2 states have call predecessors, (40), 3 states have return successors, (40), 11 states have call predecessors, (40), 11 states have call successors, (40) Word has length 285 [2021-11-13 18:39:17,289 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:39:17,298 INFO L225 Difference]: With dead ends: 2200 [2021-11-13 18:39:17,299 INFO L226 Difference]: Without dead ends: 1800 [2021-11-13 18:39:17,301 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 514 GetRequests, 461 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 464 ImplicationChecksByTransitivity, 12.2s TimeCoverageRelationStatistics Valid=543, Invalid=2425, Unknown=2, NotChecked=0, Total=2970 [2021-11-13 18:39:17,302 INFO L933 BasicCegarLoop]: 105 mSDtfsCounter, 85 mSDsluCounter, 745 mSDsCounter, 0 mSdLazyCounter, 697 mSolverCounterSat, 260 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2097.84ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 85 SdHoareTripleChecker+Valid, 850 SdHoareTripleChecker+Invalid, 957 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 5.64ms SdHoareTripleChecker+Time, 260 IncrementalHoareTripleChecker+Valid, 697 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2364.72ms IncrementalHoareTripleChecker+Time [2021-11-13 18:39:17,302 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [85 Valid, 850 Invalid, 957 Unknown, 0 Unchecked, 5.64ms Time], IncrementalHoareTripleChecker [260 Valid, 697 Invalid, 0 Unknown, 0 Unchecked, 2364.72ms Time] [2021-11-13 18:39:17,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1800 states. [2021-11-13 18:39:18,494 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1800 to 1530. [2021-11-13 18:39:18,495 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1530 states, 755 states have (on average 1.1894039735099338) internal successors, (898), 760 states have internal predecessors, (898), 744 states have call successors, (744), 30 states have call predecessors, (744), 30 states have return successors, (744), 739 states have call predecessors, (744), 744 states have call successors, (744) [2021-11-13 18:39:18,501 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1530 states to 1530 states and 2386 transitions. [2021-11-13 18:39:18,502 INFO L78 Accepts]: Start accepts. Automaton has 1530 states and 2386 transitions. Word has length 285 [2021-11-13 18:39:18,502 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:39:18,502 INFO L470 AbstractCegarLoop]: Abstraction has 1530 states and 2386 transitions. [2021-11-13 18:39:18,502 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 3.0) internal successors, (63), 20 states have internal predecessors, (63), 11 states have call successors, (40), 2 states have call predecessors, (40), 3 states have return successors, (40), 11 states have call predecessors, (40), 11 states have call successors, (40) [2021-11-13 18:39:18,502 INFO L276 IsEmpty]: Start isEmpty. Operand 1530 states and 2386 transitions. [2021-11-13 18:39:18,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 289 [2021-11-13 18:39:18,506 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:39:18,507 INFO L514 BasicCegarLoop]: trace histogram [42, 41, 41, 11, 11, 11, 11, 10, 10, 10, 10, 10, 9, 6, 5, 5, 5, 4, 4, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:39:18,514 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2021-11-13 18:39:18,707 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-11-13 18:39:18,707 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:39:18,708 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:39:18,708 INFO L85 PathProgramCache]: Analyzing trace with hash 1253840044, now seen corresponding path program 18 times [2021-11-13 18:39:18,708 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:39:18,708 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1948693218] [2021-11-13 18:39:18,708 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:39:18,708 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:39:18,715 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 18:39:18,716 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [185502778] [2021-11-13 18:39:18,716 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-13 18:39:18,716 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:39:18,716 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:39:18,717 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:39:18,719 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2021-11-13 18:39:19,301 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 9 check-sat command(s) [2021-11-13 18:39:19,301 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 18:39:19,304 INFO L263 TraceCheckSpWp]: Trace formula consists of 370 conjuncts, 54 conjunts are in the unsatisfiable core [2021-11-13 18:39:19,310 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:39:23,400 INFO L134 CoverageAnalysis]: Checked inductivity of 3783 backedges. 571 proven. 127 refuted. 0 times theorem prover too weak. 3085 trivial. 0 not checked. [2021-11-13 18:39:23,400 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:39:29,499 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:39:29,499 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1948693218] [2021-11-13 18:39:29,499 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 18:39:29,499 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [185502778] [2021-11-13 18:39:29,499 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [185502778] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 18:39:29,499 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-13 18:39:29,499 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2021-11-13 18:39:29,500 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1462237900] [2021-11-13 18:39:29,500 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-13 18:39:29,500 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-13 18:39:29,500 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:39:29,501 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-13 18:39:29,501 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=554, Unknown=0, NotChecked=0, Total=650 [2021-11-13 18:39:29,501 INFO L87 Difference]: Start difference. First operand 1530 states and 2386 transitions. Second operand has 18 states, 16 states have (on average 2.9375) internal successors, (47), 14 states have internal predecessors, (47), 8 states have call successors, (18), 2 states have call predecessors, (18), 3 states have return successors, (18), 7 states have call predecessors, (18), 7 states have call successors, (18) [2021-11-13 18:39:34,799 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-13 18:39:41,836 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:39:41,836 INFO L93 Difference]: Finished difference Result 2025 states and 3130 transitions. [2021-11-13 18:39:41,836 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-13 18:39:41,837 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 16 states have (on average 2.9375) internal successors, (47), 14 states have internal predecessors, (47), 8 states have call successors, (18), 2 states have call predecessors, (18), 3 states have return successors, (18), 7 states have call predecessors, (18), 7 states have call successors, (18) Word has length 288 [2021-11-13 18:39:41,837 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:39:41,849 INFO L225 Difference]: With dead ends: 2025 [2021-11-13 18:39:41,849 INFO L226 Difference]: Without dead ends: 2023 [2021-11-13 18:39:41,850 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 325 GetRequests, 285 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 298 ImplicationChecksByTransitivity, 14.3s TimeCoverageRelationStatistics Valid=258, Invalid=1302, Unknown=0, NotChecked=0, Total=1560 [2021-11-13 18:39:41,851 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 57 mSDsluCounter, 215 mSDsCounter, 0 mSdLazyCounter, 362 mSolverCounterSat, 42 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3551.61ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 238 SdHoareTripleChecker+Invalid, 504 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.79ms SdHoareTripleChecker+Time, 42 IncrementalHoareTripleChecker+Valid, 362 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 99 IncrementalHoareTripleChecker+Unchecked, 3634.84ms IncrementalHoareTripleChecker+Time [2021-11-13 18:39:41,851 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [59 Valid, 238 Invalid, 504 Unknown, 0 Unchecked, 2.79ms Time], IncrementalHoareTripleChecker [42 Valid, 362 Invalid, 1 Unknown, 99 Unchecked, 3634.84ms Time] [2021-11-13 18:39:41,853 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2023 states. [2021-11-13 18:39:43,472 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2023 to 2023. [2021-11-13 18:39:43,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2023 states, 1020 states have (on average 1.1803921568627451) internal successors, (1204), 1025 states have internal predecessors, (1204), 962 states have call successors, (962), 40 states have call predecessors, (962), 40 states have return successors, (962), 957 states have call predecessors, (962), 962 states have call successors, (962) [2021-11-13 18:39:43,482 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2023 states to 2023 states and 3128 transitions. [2021-11-13 18:39:43,483 INFO L78 Accepts]: Start accepts. Automaton has 2023 states and 3128 transitions. Word has length 288 [2021-11-13 18:39:43,483 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:39:43,483 INFO L470 AbstractCegarLoop]: Abstraction has 2023 states and 3128 transitions. [2021-11-13 18:39:43,484 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 16 states have (on average 2.9375) internal successors, (47), 14 states have internal predecessors, (47), 8 states have call successors, (18), 2 states have call predecessors, (18), 3 states have return successors, (18), 7 states have call predecessors, (18), 7 states have call successors, (18) [2021-11-13 18:39:43,484 INFO L276 IsEmpty]: Start isEmpty. Operand 2023 states and 3128 transitions. [2021-11-13 18:39:43,492 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 303 [2021-11-13 18:39:43,492 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:39:43,492 INFO L514 BasicCegarLoop]: trace histogram [46, 45, 45, 12, 12, 12, 12, 11, 11, 11, 11, 11, 7, 7, 5, 4, 4, 4, 4, 4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:39:43,511 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2021-11-13 18:39:43,698 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-11-13 18:39:43,699 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:39:43,700 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:39:43,700 INFO L85 PathProgramCache]: Analyzing trace with hash -1629976158, now seen corresponding path program 19 times [2021-11-13 18:39:43,700 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:39:43,700 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1089124349] [2021-11-13 18:39:43,700 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:39:43,700 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:39:43,710 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 18:39:43,710 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [490938885] [2021-11-13 18:39:43,710 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-13 18:39:43,710 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:39:43,710 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:39:43,711 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:39:43,739 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2021-11-13 18:39:43,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:39:43,829 INFO L263 TraceCheckSpWp]: Trace formula consists of 646 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-13 18:39:43,834 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:39:45,590 INFO L134 CoverageAnalysis]: Checked inductivity of 4492 backedges. 2178 proven. 126 refuted. 0 times theorem prover too weak. 2188 trivial. 0 not checked. [2021-11-13 18:39:45,590 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:39:46,908 INFO L134 CoverageAnalysis]: Checked inductivity of 4492 backedges. 308 proven. 126 refuted. 0 times theorem prover too weak. 4058 trivial. 0 not checked. [2021-11-13 18:39:46,909 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:39:46,909 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1089124349] [2021-11-13 18:39:46,909 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 18:39:46,909 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [490938885] [2021-11-13 18:39:46,909 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [490938885] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 18:39:46,909 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-13 18:39:46,910 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-11-13 18:39:46,910 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1773073764] [2021-11-13 18:39:46,910 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-13 18:39:46,911 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-13 18:39:46,911 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:39:46,911 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-13 18:39:46,911 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=152, Unknown=0, NotChecked=0, Total=182 [2021-11-13 18:39:46,911 INFO L87 Difference]: Start difference. First operand 2023 states and 3128 transitions. Second operand has 14 states, 14 states have (on average 3.7857142857142856) internal successors, (53), 14 states have internal predecessors, (53), 11 states have call successors, (48), 2 states have call predecessors, (48), 2 states have return successors, (48), 11 states have call predecessors, (48), 11 states have call successors, (48) [2021-11-13 18:39:53,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:39:53,374 INFO L93 Difference]: Finished difference Result 4739 states and 7453 transitions. [2021-11-13 18:39:53,375 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-13 18:39:53,375 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.7857142857142856) internal successors, (53), 14 states have internal predecessors, (53), 11 states have call successors, (48), 2 states have call predecessors, (48), 2 states have return successors, (48), 11 states have call predecessors, (48), 11 states have call successors, (48) Word has length 302 [2021-11-13 18:39:53,376 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:39:53,396 INFO L225 Difference]: With dead ends: 4739 [2021-11-13 18:39:53,397 INFO L226 Difference]: Without dead ends: 3326 [2021-11-13 18:39:53,403 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 621 GetRequests, 591 SyntacticMatches, 4 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=186, Invalid=570, Unknown=0, NotChecked=0, Total=756 [2021-11-13 18:39:53,403 INFO L933 BasicCegarLoop]: 109 mSDtfsCounter, 52 mSDsluCounter, 726 mSDsCounter, 0 mSdLazyCounter, 578 mSolverCounterSat, 78 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2005.43ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 835 SdHoareTripleChecker+Invalid, 656 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.82ms SdHoareTripleChecker+Time, 78 IncrementalHoareTripleChecker+Valid, 578 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2233.14ms IncrementalHoareTripleChecker+Time [2021-11-13 18:39:53,404 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [52 Valid, 835 Invalid, 656 Unknown, 0 Unchecked, 3.82ms Time], IncrementalHoareTripleChecker [78 Valid, 578 Invalid, 0 Unknown, 0 Unchecked, 2233.14ms Time] [2021-11-13 18:39:53,407 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3326 states. [2021-11-13 18:39:55,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3326 to 2836. [2021-11-13 18:39:55,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2836 states, 1353 states have (on average 1.1973392461197339) internal successors, (1620), 1358 states have internal predecessors, (1620), 1442 states have call successors, (1442), 40 states have call predecessors, (1442), 40 states have return successors, (1442), 1437 states have call predecessors, (1442), 1442 states have call successors, (1442) [2021-11-13 18:39:55,881 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2836 states to 2836 states and 4504 transitions. [2021-11-13 18:39:55,881 INFO L78 Accepts]: Start accepts. Automaton has 2836 states and 4504 transitions. Word has length 302 [2021-11-13 18:39:55,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:39:55,882 INFO L470 AbstractCegarLoop]: Abstraction has 2836 states and 4504 transitions. [2021-11-13 18:39:55,882 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 3.7857142857142856) internal successors, (53), 14 states have internal predecessors, (53), 11 states have call successors, (48), 2 states have call predecessors, (48), 2 states have return successors, (48), 11 states have call predecessors, (48), 11 states have call successors, (48) [2021-11-13 18:39:55,883 INFO L276 IsEmpty]: Start isEmpty. Operand 2836 states and 4504 transitions. [2021-11-13 18:39:55,893 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 325 [2021-11-13 18:39:55,893 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:39:55,894 INFO L514 BasicCegarLoop]: trace histogram [50, 49, 49, 13, 13, 13, 13, 12, 12, 12, 12, 12, 8, 7, 5, 4, 4, 4, 4, 4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:39:55,932 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2021-11-13 18:39:56,107 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-11-13 18:39:56,107 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:39:56,108 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:39:56,108 INFO L85 PathProgramCache]: Analyzing trace with hash 1873281731, now seen corresponding path program 20 times [2021-11-13 18:39:56,108 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:39:56,108 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [836843411] [2021-11-13 18:39:56,108 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:39:56,108 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:39:56,118 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 18:39:56,118 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [623005469] [2021-11-13 18:39:56,118 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-13 18:39:56,118 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:39:56,119 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:39:56,119 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:39:56,139 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41b52939-7bac-4a25-86da-86a159d2d9eb/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2021-11-13 18:39:56,241 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-13 18:39:56,242 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 18:39:56,246 INFO L263 TraceCheckSpWp]: Trace formula consists of 688 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-13 18:39:56,251 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:40:12,408 INFO L134 CoverageAnalysis]: Checked inductivity of 5313 backedges. 351 proven. 433 refuted. 0 times theorem prover too weak. 4529 trivial. 0 not checked. [2021-11-13 18:40:12,409 INFO L328 TraceCheckSpWp]: Computing backward predicates...