./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench/ps4-ll.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_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/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_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/config/AutomizerReach.xml -i ../../sv-benchmarks/c/nla-digbench/ps4-ll.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/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_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/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 ef01badb7f90b6597aa83d48583be40b7afc9a4c054f915d626bd89be70c7009 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-63182f1 [2021-11-13 17:45:19,369 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-13 17:45:19,371 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-13 17:45:19,425 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-13 17:45:19,426 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-13 17:45:19,430 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-13 17:45:19,432 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-13 17:45:19,436 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-13 17:45:19,439 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-13 17:45:19,447 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-13 17:45:19,448 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-13 17:45:19,450 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-13 17:45:19,451 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-13 17:45:19,454 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-13 17:45:19,455 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-13 17:45:19,457 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-13 17:45:19,458 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-13 17:45:19,459 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-13 17:45:19,461 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-13 17:45:19,463 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-13 17:45:19,465 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-13 17:45:19,466 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-13 17:45:19,468 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-13 17:45:19,469 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-13 17:45:19,472 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-13 17:45:19,473 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-13 17:45:19,473 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-13 17:45:19,474 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-13 17:45:19,475 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-13 17:45:19,476 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-13 17:45:19,476 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-13 17:45:19,477 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-13 17:45:19,478 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-13 17:45:19,479 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-13 17:45:19,480 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-13 17:45:19,481 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-13 17:45:19,482 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-13 17:45:19,482 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-13 17:45:19,483 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-13 17:45:19,484 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-13 17:45:19,485 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-13 17:45:19,486 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-11-13 17:45:19,515 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-13 17:45:19,515 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-13 17:45:19,515 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-13 17:45:19,516 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-13 17:45:19,517 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-13 17:45:19,517 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-13 17:45:19,518 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-13 17:45:19,518 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-13 17:45:19,519 INFO L138 SettingsManager]: * Use SBE=true [2021-11-13 17:45:19,519 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-13 17:45:19,520 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-13 17:45:19,520 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-13 17:45:19,520 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-13 17:45:19,521 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-13 17:45:19,521 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-13 17:45:19,521 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-13 17:45:19,521 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-13 17:45:19,522 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-13 17:45:19,522 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-13 17:45:19,522 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-13 17:45:19,522 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-13 17:45:19,523 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-13 17:45:19,523 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-13 17:45:19,523 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-13 17:45:19,523 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-13 17:45:19,523 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-13 17:45:19,524 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-13 17:45:19,524 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-13 17:45:19,524 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-11-13 17:45:19,524 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-13 17:45:19,524 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-11-13 17:45:19,525 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-11-13 17:45:19,525 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-13 17:45:19,525 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-13 17:45:19,525 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_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> ef01badb7f90b6597aa83d48583be40b7afc9a4c054f915d626bd89be70c7009 [2021-11-13 17:45:19,801 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-13 17:45:19,837 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-13 17:45:19,840 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-13 17:45:19,842 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-13 17:45:19,843 INFO L275 PluginConnector]: CDTParser initialized [2021-11-13 17:45:19,844 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/../../sv-benchmarks/c/nla-digbench/ps4-ll.c [2021-11-13 17:45:19,927 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/data/37e6e603b/483b104ea40b48d987c30cd6fcd54877/FLAG44c9ff565 [2021-11-13 17:45:20,344 INFO L306 CDTParser]: Found 1 translation units. [2021-11-13 17:45:20,344 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/sv-benchmarks/c/nla-digbench/ps4-ll.c [2021-11-13 17:45:20,352 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/data/37e6e603b/483b104ea40b48d987c30cd6fcd54877/FLAG44c9ff565 [2021-11-13 17:45:20,741 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/data/37e6e603b/483b104ea40b48d987c30cd6fcd54877 [2021-11-13 17:45:20,744 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-13 17:45:20,745 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-13 17:45:20,747 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-13 17:45:20,747 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-13 17:45:20,767 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-13 17:45:20,767 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.11 05:45:20" (1/1) ... [2021-11-13 17:45:20,768 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@d8841c1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 05:45:20, skipping insertion in model container [2021-11-13 17:45:20,769 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.11 05:45:20" (1/1) ... [2021-11-13 17:45:20,776 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-13 17:45:20,790 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-13 17:45:20,956 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_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/sv-benchmarks/c/nla-digbench/ps4-ll.c[458,471] [2021-11-13 17:45:20,980 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-13 17:45:20,994 INFO L203 MainTranslator]: Completed pre-run [2021-11-13 17:45:21,010 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_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/sv-benchmarks/c/nla-digbench/ps4-ll.c[458,471] [2021-11-13 17:45:21,032 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-13 17:45:21,048 INFO L208 MainTranslator]: Completed translation [2021-11-13 17:45:21,048 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 05:45:21 WrapperNode [2021-11-13 17:45:21,049 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-13 17:45:21,051 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-13 17:45:21,051 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-13 17:45:21,051 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-13 17:45:21,059 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 05:45:21" (1/1) ... [2021-11-13 17:45:21,068 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 05:45:21" (1/1) ... [2021-11-13 17:45:21,087 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-13 17:45:21,088 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-13 17:45:21,088 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-13 17:45:21,088 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-13 17:45:21,096 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 05:45:21" (1/1) ... [2021-11-13 17:45:21,097 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 05:45:21" (1/1) ... [2021-11-13 17:45:21,107 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 05:45:21" (1/1) ... [2021-11-13 17:45:21,107 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 05:45:21" (1/1) ... [2021-11-13 17:45:21,113 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 05:45:21" (1/1) ... [2021-11-13 17:45:21,121 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 05:45:21" (1/1) ... [2021-11-13 17:45:21,124 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 05:45:21" (1/1) ... [2021-11-13 17:45:21,125 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-13 17:45:21,127 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-13 17:45:21,127 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-13 17:45:21,128 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-13 17:45:21,129 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 05:45:21" (1/1) ... [2021-11-13 17:45:21,137 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-13 17:45:21,148 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:45:21,166 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-13 17:45:21,197 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-13 17:45:21,215 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-13 17:45:21,215 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-13 17:45:21,215 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-13 17:45:21,215 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-13 17:45:21,215 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-11-13 17:45:21,216 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-11-13 17:45:21,419 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-13 17:45:21,420 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-13 17:45:21,421 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.11 05:45:21 BoogieIcfgContainer [2021-11-13 17:45:21,422 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-13 17:45:21,424 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-13 17:45:21,424 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-13 17:45:21,427 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-13 17:45:21,428 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 13.11 05:45:20" (1/3) ... [2021-11-13 17:45:21,429 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3bae9751 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.11 05:45:21, skipping insertion in model container [2021-11-13 17:45:21,429 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 05:45:21" (2/3) ... [2021-11-13 17:45:21,429 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3bae9751 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.11 05:45:21, skipping insertion in model container [2021-11-13 17:45:21,430 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.11 05:45:21" (3/3) ... [2021-11-13 17:45:21,431 INFO L111 eAbstractionObserver]: Analyzing ICFG ps4-ll.c [2021-11-13 17:45:21,437 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-13 17:45:21,437 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-13 17:45:21,505 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-13 17:45:21,514 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 17:45:21,528 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-13 17:45:21,545 INFO L276 IsEmpty]: Start isEmpty. Operand has 17 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-13 17:45:21,551 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-13 17:45:21,551 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:45:21,552 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:45:21,552 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 17:45:21,558 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:45:21,558 INFO L85 PathProgramCache]: Analyzing trace with hash 1818834085, now seen corresponding path program 1 times [2021-11-13 17:45:21,568 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:45:21,568 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [475059258] [2021-11-13 17:45:21,569 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:45:21,570 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:45:21,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:45:21,759 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 17:45:21,760 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:45:21,760 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [475059258] [2021-11-13 17:45:21,761 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [475059258] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 17:45:21,761 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 17:45:21,761 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-13 17:45:21,763 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1192575217] [2021-11-13 17:45:21,764 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 17:45:21,774 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-13 17:45:21,774 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:45:21,815 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-13 17:45:21,817 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-13 17:45:21,819 INFO L87 Difference]: Start difference. First operand has 17 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 17:45:21,844 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:45:21,844 INFO L93 Difference]: Finished difference Result 32 states and 45 transitions. [2021-11-13 17:45:21,847 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-13 17:45:21,848 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-11-13 17:45:21,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:45:21,855 INFO L225 Difference]: With dead ends: 32 [2021-11-13 17:45:21,856 INFO L226 Difference]: Without dead ends: 13 [2021-11-13 17:45:21,859 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 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 17:45:21,864 INFO L933 BasicCegarLoop]: 19 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, 19 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.69ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.00ms IncrementalHoareTripleChecker+Time [2021-11-13 17:45:21,865 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.69ms Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.00ms Time] [2021-11-13 17:45:21,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2021-11-13 17:45:21,903 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2021-11-13 17:45:21,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 8 states have (on average 1.25) internal successors, (10), 9 states have internal predecessors, (10), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-13 17:45:21,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 15 transitions. [2021-11-13 17:45:21,907 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 15 transitions. Word has length 7 [2021-11-13 17:45:21,907 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:45:21,908 INFO L470 AbstractCegarLoop]: Abstraction has 13 states and 15 transitions. [2021-11-13 17:45:21,908 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 17:45:21,908 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 15 transitions. [2021-11-13 17:45:21,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-13 17:45:21,918 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:45:21,918 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:45:21,919 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-13 17:45:21,920 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 17:45:21,923 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:45:21,925 INFO L85 PathProgramCache]: Analyzing trace with hash 1811386335, now seen corresponding path program 1 times [2021-11-13 17:45:21,925 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:45:21,925 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [659982735] [2021-11-13 17:45:21,926 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:45:21,926 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:45:21,951 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 17:45:21,951 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1999196309] [2021-11-13 17:45:21,951 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:45:21,952 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:45:21,952 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:45:21,954 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:45:21,972 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-13 17:45:22,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:45:22,015 INFO L263 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-13 17:45:22,020 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:45:22,116 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 17:45:22,116 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-13 17:45:22,117 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:45:22,117 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [659982735] [2021-11-13 17:45:22,117 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 17:45:22,118 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1999196309] [2021-11-13 17:45:22,118 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1999196309] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 17:45:22,118 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 17:45:22,118 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-13 17:45:22,119 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1168515235] [2021-11-13 17:45:22,120 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 17:45:22,120 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-13 17:45:22,121 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:45:22,121 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-13 17:45:22,122 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-13 17:45:22,122 INFO L87 Difference]: Start difference. First operand 13 states and 15 transitions. Second operand has 5 states, 5 states have (on average 1.2) internal successors, (6), 4 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 17:45:22,197 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:45:22,198 INFO L93 Difference]: Finished difference Result 24 states and 28 transitions. [2021-11-13 17:45:22,198 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-13 17:45:22,198 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.2) internal successors, (6), 4 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-11-13 17:45:22,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:45:22,199 INFO L225 Difference]: With dead ends: 24 [2021-11-13 17:45:22,200 INFO L226 Difference]: Without dead ends: 20 [2021-11-13 17:45:22,200 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-13 17:45:22,202 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 6 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 51.21ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 23 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.93ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 56.27ms IncrementalHoareTripleChecker+Time [2021-11-13 17:45:22,203 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 44 Invalid, 23 Unknown, 0 Unchecked, 1.93ms Time], IncrementalHoareTripleChecker [2 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 56.27ms Time] [2021-11-13 17:45:22,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-11-13 17:45:22,210 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2021-11-13 17:45:22,210 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 14 states have internal predecessors, (15), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-13 17:45:22,212 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2021-11-13 17:45:22,212 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 7 [2021-11-13 17:45:22,212 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:45:22,212 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2021-11-13 17:45:22,213 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.2) internal successors, (6), 4 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 17:45:22,213 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2021-11-13 17:45:22,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-13 17:45:22,214 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:45:22,214 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:45:22,252 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-13 17:45:22,440 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:45:22,441 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 17:45:22,442 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:45:22,442 INFO L85 PathProgramCache]: Analyzing trace with hash -555889191, now seen corresponding path program 1 times [2021-11-13 17:45:22,442 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:45:22,442 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1194697406] [2021-11-13 17:45:22,442 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:45:22,443 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:45:22,457 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 17:45:22,457 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [51330373] [2021-11-13 17:45:22,457 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:45:22,458 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:45:22,458 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:45:22,459 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:45:22,461 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-13 17:45:22,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:45:22,538 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-13 17:45:22,540 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:45:22,699 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 17:45:22,700 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:45:25,703 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-13 17:45:25,704 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:45:25,704 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1194697406] [2021-11-13 17:45:25,704 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 17:45:25,705 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [51330373] [2021-11-13 17:45:25,705 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [51330373] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-13 17:45:25,705 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-13 17:45:25,705 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 7 [2021-11-13 17:45:25,706 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1650140461] [2021-11-13 17:45:25,706 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 17:45:25,706 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-13 17:45:25,707 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:45:25,707 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-13 17:45:25,708 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=28, Unknown=1, NotChecked=0, Total=42 [2021-11-13 17:45:25,708 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:45:25,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:45:25,747 INFO L93 Difference]: Finished difference Result 26 states and 27 transitions. [2021-11-13 17:45:25,748 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-13 17:45:25,748 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2021-11-13 17:45:25,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:45:25,749 INFO L225 Difference]: With dead ends: 26 [2021-11-13 17:45:25,749 INFO L226 Difference]: Without dead ends: 21 [2021-11-13 17:45:25,750 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=17, Invalid=38, Unknown=1, NotChecked=0, Total=56 [2021-11-13 17:45:25,752 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 19.52ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 16 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.36ms SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 22.99ms IncrementalHoareTripleChecker+Time [2021-11-13 17:45:25,753 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 37 Invalid, 16 Unknown, 0 Unchecked, 1.36ms Time], IncrementalHoareTripleChecker [1 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 22.99ms Time] [2021-11-13 17:45:25,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-11-13 17:45:25,758 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2021-11-13 17:45:25,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 15 states have (on average 1.0666666666666667) internal successors, (16), 15 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-13 17:45:25,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2021-11-13 17:45:25,760 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 14 [2021-11-13 17:45:25,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:45:25,761 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2021-11-13 17:45:25,761 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:45:25,761 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2021-11-13 17:45:25,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-13 17:45:25,762 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:45:25,762 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:45:25,799 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-13 17:45:25,976 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:45:25,977 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 17:45:25,977 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:45:25,978 INFO L85 PathProgramCache]: Analyzing trace with hash 219170934, now seen corresponding path program 1 times [2021-11-13 17:45:25,978 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:45:25,978 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [611149760] [2021-11-13 17:45:25,978 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:45:25,979 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:45:25,989 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 17:45:25,991 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2074500481] [2021-11-13 17:45:25,992 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:45:25,992 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:45:25,992 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:45:26,008 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:45:26,028 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-13 17:45:26,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:45:26,069 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-13 17:45:26,071 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:45:26,404 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-13 17:45:26,404 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:45:26,941 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:45:26,941 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [611149760] [2021-11-13 17:45:26,942 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 17:45:26,942 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2074500481] [2021-11-13 17:45:26,942 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2074500481] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:45:26,942 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-13 17:45:26,942 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-11-13 17:45:26,943 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [600451683] [2021-11-13 17:45:26,943 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-13 17:45:26,943 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-13 17:45:26,944 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:45:26,944 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-13 17:45:26,945 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=164, Unknown=0, NotChecked=0, Total=210 [2021-11-13 17:45:26,945 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand has 10 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 8 states have internal predecessors, (15), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-13 17:45:27,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:45:27,097 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2021-11-13 17:45:27,099 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-13 17:45:27,100 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 8 states have internal predecessors, (15), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 20 [2021-11-13 17:45:27,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:45:27,101 INFO L225 Difference]: With dead ends: 33 [2021-11-13 17:45:27,101 INFO L226 Difference]: Without dead ends: 28 [2021-11-13 17:45:27,101 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 18 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=67, Invalid=239, Unknown=0, NotChecked=0, Total=306 [2021-11-13 17:45:27,103 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 13 mSDsluCounter, 53 mSDsCounter, 0 mSdLazyCounter, 82 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 69.99ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 86 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.34ms SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 82 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 91.92ms IncrementalHoareTripleChecker+Time [2021-11-13 17:45:27,103 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 62 Invalid, 86 Unknown, 0 Unchecked, 3.34ms Time], IncrementalHoareTripleChecker [4 Valid, 82 Invalid, 0 Unknown, 0 Unchecked, 91.92ms Time] [2021-11-13 17:45:27,104 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-11-13 17:45:27,109 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2021-11-13 17:45:27,109 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 20 states have (on average 1.05) internal successors, (21), 20 states have internal predecessors, (21), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-13 17:45:27,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2021-11-13 17:45:27,110 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 20 [2021-11-13 17:45:27,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:45:27,111 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2021-11-13 17:45:27,111 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 8 states have internal predecessors, (15), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-13 17:45:27,111 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2021-11-13 17:45:27,112 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-13 17:45:27,112 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:45:27,112 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1] [2021-11-13 17:45:27,153 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-13 17:45:27,332 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:45:27,333 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 17:45:27,333 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:45:27,333 INFO L85 PathProgramCache]: Analyzing trace with hash 1804341436, now seen corresponding path program 2 times [2021-11-13 17:45:27,334 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:45:27,334 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2118542237] [2021-11-13 17:45:27,334 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:45:27,334 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:45:27,345 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 17:45:27,347 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1619055763] [2021-11-13 17:45:27,348 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-13 17:45:27,348 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:45:27,348 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:45:27,359 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:45:27,360 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-13 17:45:27,408 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-13 17:45:27,409 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 17:45:27,410 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-13 17:45:27,412 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:45:27,642 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 6 proven. 9 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-13 17:45:27,643 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:45:27,925 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:45:27,925 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2118542237] [2021-11-13 17:45:27,925 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 17:45:27,925 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1619055763] [2021-11-13 17:45:27,926 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1619055763] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:45:27,926 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-13 17:45:27,926 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-11-13 17:45:27,926 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2021205989] [2021-11-13 17:45:27,927 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-13 17:45:27,927 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-13 17:45:27,927 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:45:27,928 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-13 17:45:27,928 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2021-11-13 17:45:27,928 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand has 8 states, 7 states have (on average 2.0) internal successors, (14), 7 states have internal predecessors, (14), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-13 17:45:28,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:45:28,010 INFO L93 Difference]: Finished difference Result 36 states and 37 transitions. [2021-11-13 17:45:28,010 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-13 17:45:28,010 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.0) internal successors, (14), 7 states have internal predecessors, (14), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 27 [2021-11-13 17:45:28,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:45:28,011 INFO L225 Difference]: With dead ends: 36 [2021-11-13 17:45:28,012 INFO L226 Difference]: Without dead ends: 31 [2021-11-13 17:45:28,012 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=42, Invalid=140, Unknown=0, NotChecked=0, Total=182 [2021-11-13 17:45:28,014 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 2 mSDsluCounter, 81 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 42.30ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 99 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.58ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 49.49ms IncrementalHoareTripleChecker+Time [2021-11-13 17:45:28,014 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 99 Invalid, 51 Unknown, 0 Unchecked, 1.58ms Time], IncrementalHoareTripleChecker [0 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 49.49ms Time] [2021-11-13 17:45:28,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-11-13 17:45:28,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2021-11-13 17:45:28,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 22 states have (on average 1.0454545454545454) internal successors, (23), 22 states have internal predecessors, (23), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-13 17:45:28,022 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2021-11-13 17:45:28,023 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 27 [2021-11-13 17:45:28,023 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:45:28,023 INFO L470 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2021-11-13 17:45:28,024 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.0) internal successors, (14), 7 states have internal predecessors, (14), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-13 17:45:28,024 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2021-11-13 17:45:28,025 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-13 17:45:28,025 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:45:28,025 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1] [2021-11-13 17:45:28,053 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-13 17:45:28,240 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:45:28,241 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 17:45:28,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:45:28,241 INFO L85 PathProgramCache]: Analyzing trace with hash 793873846, now seen corresponding path program 3 times [2021-11-13 17:45:28,241 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:45:28,241 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1344764255] [2021-11-13 17:45:28,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:45:28,242 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:45:28,251 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 17:45:28,252 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [144252976] [2021-11-13 17:45:28,252 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 17:45:28,252 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:45:28,252 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:45:28,253 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:45:28,257 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-13 17:45:28,560 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-13 17:45:28,560 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 17:45:28,562 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-13 17:45:28,564 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:45:28,780 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 8 proven. 18 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-13 17:45:28,780 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:45:28,948 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:45:28,948 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1344764255] [2021-11-13 17:45:28,948 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 17:45:28,948 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [144252976] [2021-11-13 17:45:28,948 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [144252976] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:45:28,948 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-13 17:45:28,948 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-11-13 17:45:28,949 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1560068334] [2021-11-13 17:45:28,949 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-13 17:45:28,949 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-13 17:45:28,949 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:45:28,950 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-13 17:45:28,950 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-11-13 17:45:28,950 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand has 9 states, 8 states have (on average 2.0) internal successors, (16), 8 states have internal predecessors, (16), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-13 17:45:29,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:45:29,052 INFO L93 Difference]: Finished difference Result 39 states and 41 transitions. [2021-11-13 17:45:29,052 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-13 17:45:29,053 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 2.0) internal successors, (16), 8 states have internal predecessors, (16), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 34 [2021-11-13 17:45:29,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:45:29,054 INFO L225 Difference]: With dead ends: 39 [2021-11-13 17:45:29,054 INFO L226 Difference]: Without dead ends: 34 [2021-11-13 17:45:29,054 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=40, Invalid=142, Unknown=0, NotChecked=0, Total=182 [2021-11-13 17:45:29,055 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 2 mSDsluCounter, 109 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 59.51ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 130 SdHoareTripleChecker+Invalid, 72 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.73ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 71.53ms IncrementalHoareTripleChecker+Time [2021-11-13 17:45:29,055 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 130 Invalid, 72 Unknown, 0 Unchecked, 1.73ms Time], IncrementalHoareTripleChecker [0 Valid, 72 Invalid, 0 Unknown, 0 Unchecked, 71.53ms Time] [2021-11-13 17:45:29,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-11-13 17:45:29,062 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2021-11-13 17:45:29,062 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 24 states have (on average 1.0416666666666667) internal successors, (25), 24 states have internal predecessors, (25), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-11-13 17:45:29,063 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 36 transitions. [2021-11-13 17:45:29,064 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 36 transitions. Word has length 34 [2021-11-13 17:45:29,064 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:45:29,064 INFO L470 AbstractCegarLoop]: Abstraction has 34 states and 36 transitions. [2021-11-13 17:45:29,064 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 2.0) internal successors, (16), 8 states have internal predecessors, (16), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-13 17:45:29,065 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 36 transitions. [2021-11-13 17:45:29,066 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-13 17:45:29,066 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:45:29,066 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1] [2021-11-13 17:45:29,074 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-13 17:45:29,270 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:45:29,271 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 17:45:29,272 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:45:29,272 INFO L85 PathProgramCache]: Analyzing trace with hash 395207548, now seen corresponding path program 4 times [2021-11-13 17:45:29,272 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:45:29,272 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1723479033] [2021-11-13 17:45:29,272 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:45:29,272 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:45:29,281 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 17:45:29,281 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1410355154] [2021-11-13 17:45:29,281 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-13 17:45:29,281 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:45:29,282 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:45:29,282 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:45:29,304 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-13 17:45:29,434 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-13 17:45:29,434 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 17:45:29,436 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-13 17:45:29,439 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:45:29,795 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 23 proven. 35 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-13 17:45:29,795 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:45:30,129 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:45:30,129 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1723479033] [2021-11-13 17:45:30,131 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 17:45:30,132 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1410355154] [2021-11-13 17:45:30,132 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1410355154] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:45:30,132 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-13 17:45:30,133 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2021-11-13 17:45:30,133 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [685116355] [2021-11-13 17:45:30,133 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-13 17:45:30,134 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-13 17:45:30,134 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:45:30,134 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-13 17:45:30,135 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=283, Unknown=0, NotChecked=0, Total=342 [2021-11-13 17:45:30,135 INFO L87 Difference]: Start difference. First operand 34 states and 36 transitions. Second operand has 14 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 11 states have internal predecessors, (21), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-11-13 17:45:30,361 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:45:30,361 INFO L93 Difference]: Finished difference Result 46 states and 48 transitions. [2021-11-13 17:45:30,362 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-13 17:45:30,362 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 11 states have internal predecessors, (21), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Word has length 41 [2021-11-13 17:45:30,362 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:45:30,363 INFO L225 Difference]: With dead ends: 46 [2021-11-13 17:45:30,363 INFO L226 Difference]: Without dead ends: 41 [2021-11-13 17:45:30,364 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=80, Invalid=382, Unknown=0, NotChecked=0, Total=462 [2021-11-13 17:45:30,365 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 12 mSDsluCounter, 138 mSDsCounter, 0 mSdLazyCounter, 176 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 128.54ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 155 SdHoareTripleChecker+Invalid, 182 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.34ms SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 176 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 158.90ms IncrementalHoareTripleChecker+Time [2021-11-13 17:45:30,365 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 155 Invalid, 182 Unknown, 0 Unchecked, 2.34ms Time], IncrementalHoareTripleChecker [6 Valid, 176 Invalid, 0 Unknown, 0 Unchecked, 158.90ms Time] [2021-11-13 17:45:30,366 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-11-13 17:45:30,372 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2021-11-13 17:45:30,373 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 29 states have (on average 1.0344827586206897) internal successors, (30), 29 states have internal predecessors, (30), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-13 17:45:30,374 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 43 transitions. [2021-11-13 17:45:30,374 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 43 transitions. Word has length 41 [2021-11-13 17:45:30,374 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:45:30,374 INFO L470 AbstractCegarLoop]: Abstraction has 41 states and 43 transitions. [2021-11-13 17:45:30,375 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 11 states have internal predecessors, (21), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-11-13 17:45:30,375 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 43 transitions. [2021-11-13 17:45:30,376 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-13 17:45:30,376 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:45:30,376 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 5, 1, 1, 1, 1, 1, 1] [2021-11-13 17:45:30,414 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-13 17:45:30,602 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-11-13 17:45:30,603 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 17:45:30,603 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:45:30,603 INFO L85 PathProgramCache]: Analyzing trace with hash 1716560630, now seen corresponding path program 5 times [2021-11-13 17:45:30,603 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:45:30,603 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1267599199] [2021-11-13 17:45:30,604 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:45:30,604 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:45:30,614 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 17:45:30,615 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [443177180] [2021-11-13 17:45:30,615 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-13 17:45:30,615 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:45:30,615 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:45:30,616 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:45:30,617 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-13 17:45:30,755 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-11-13 17:45:30,755 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 17:45:30,757 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-13 17:45:30,759 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:45:31,053 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 12 proven. 45 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2021-11-13 17:45:31,053 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:45:31,228 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:45:31,229 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1267599199] [2021-11-13 17:45:31,229 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 17:45:31,229 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [443177180] [2021-11-13 17:45:31,229 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [443177180] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:45:31,229 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-13 17:45:31,229 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-11-13 17:45:31,230 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1157824893] [2021-11-13 17:45:31,230 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-13 17:45:31,230 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-13 17:45:31,230 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:45:31,231 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-13 17:45:31,231 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2021-11-13 17:45:31,231 INFO L87 Difference]: Start difference. First operand 41 states and 43 transitions. Second operand has 11 states, 10 states have (on average 2.0) internal successors, (20), 10 states have internal predecessors, (20), 7 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-13 17:45:31,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:45:31,380 INFO L93 Difference]: Finished difference Result 49 states and 52 transitions. [2021-11-13 17:45:31,380 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-13 17:45:31,380 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 2.0) internal successors, (20), 10 states have internal predecessors, (20), 7 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Word has length 48 [2021-11-13 17:45:31,381 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:45:31,381 INFO L225 Difference]: With dead ends: 49 [2021-11-13 17:45:31,381 INFO L226 Difference]: Without dead ends: 44 [2021-11-13 17:45:31,382 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 47 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=46, Invalid=194, Unknown=0, NotChecked=0, Total=240 [2021-11-13 17:45:31,383 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 2 mSDsluCounter, 177 mSDsCounter, 0 mSdLazyCounter, 126 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 97.21ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 204 SdHoareTripleChecker+Invalid, 126 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.01ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 126 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 112.05ms IncrementalHoareTripleChecker+Time [2021-11-13 17:45:31,383 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 204 Invalid, 126 Unknown, 0 Unchecked, 2.01ms Time], IncrementalHoareTripleChecker [0 Valid, 126 Invalid, 0 Unknown, 0 Unchecked, 112.05ms Time] [2021-11-13 17:45:31,384 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-11-13 17:45:31,390 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2021-11-13 17:45:31,390 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 31 states have (on average 1.032258064516129) internal successors, (32), 31 states have internal predecessors, (32), 8 states have call successors, (8), 5 states have call predecessors, (8), 4 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-13 17:45:31,391 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 47 transitions. [2021-11-13 17:45:31,391 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 47 transitions. Word has length 48 [2021-11-13 17:45:31,392 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:45:31,392 INFO L470 AbstractCegarLoop]: Abstraction has 44 states and 47 transitions. [2021-11-13 17:45:31,392 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 2.0) internal successors, (20), 10 states have internal predecessors, (20), 7 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-13 17:45:31,392 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 47 transitions. [2021-11-13 17:45:31,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-13 17:45:31,393 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:45:31,393 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 6, 1, 1, 1, 1, 1, 1] [2021-11-13 17:45:31,432 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-13 17:45:31,616 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-11-13 17:45:31,617 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 17:45:31,617 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:45:31,617 INFO L85 PathProgramCache]: Analyzing trace with hash 1151919676, now seen corresponding path program 6 times [2021-11-13 17:45:31,617 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:45:31,617 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [714918899] [2021-11-13 17:45:31,617 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:45:31,618 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:45:31,625 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 17:45:31,625 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1742037141] [2021-11-13 17:45:31,625 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-13 17:45:31,625 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:45:31,626 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:45:31,628 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:45:31,632 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-13 17:45:31,941 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-11-13 17:45:31,942 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 17:45:31,944 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-13 17:45:31,947 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:45:32,281 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 14 proven. 63 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2021-11-13 17:45:32,281 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:45:32,484 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:45:32,485 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [714918899] [2021-11-13 17:45:32,485 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 17:45:32,485 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1742037141] [2021-11-13 17:45:32,485 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1742037141] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:45:32,489 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-13 17:45:32,489 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2021-11-13 17:45:32,490 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1739196600] [2021-11-13 17:45:32,493 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-13 17:45:32,494 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-13 17:45:32,495 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:45:32,496 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-13 17:45:32,496 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2021-11-13 17:45:32,497 INFO L87 Difference]: Start difference. First operand 44 states and 47 transitions. Second operand has 12 states, 11 states have (on average 2.0) internal successors, (22), 11 states have internal predecessors, (22), 8 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-13 17:45:32,698 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:45:32,698 INFO L93 Difference]: Finished difference Result 52 states and 56 transitions. [2021-11-13 17:45:32,699 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-13 17:45:32,699 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 2.0) internal successors, (22), 11 states have internal predecessors, (22), 8 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) Word has length 55 [2021-11-13 17:45:32,700 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:45:32,700 INFO L225 Difference]: With dead ends: 52 [2021-11-13 17:45:32,700 INFO L226 Difference]: Without dead ends: 47 [2021-11-13 17:45:32,701 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 53 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=223, Unknown=0, NotChecked=0, Total=272 [2021-11-13 17:45:32,701 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 2 mSDsluCounter, 217 mSDsCounter, 0 mSdLazyCounter, 159 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 131.15ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 247 SdHoareTripleChecker+Invalid, 159 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.66ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 159 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 162.01ms IncrementalHoareTripleChecker+Time [2021-11-13 17:45:32,702 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 247 Invalid, 159 Unknown, 0 Unchecked, 2.66ms Time], IncrementalHoareTripleChecker [0 Valid, 159 Invalid, 0 Unknown, 0 Unchecked, 162.01ms Time] [2021-11-13 17:45:32,702 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-11-13 17:45:32,713 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2021-11-13 17:45:32,716 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 33 states have (on average 1.0303030303030303) internal successors, (34), 33 states have internal predecessors, (34), 9 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-13 17:45:32,717 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 51 transitions. [2021-11-13 17:45:32,718 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 51 transitions. Word has length 55 [2021-11-13 17:45:32,718 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:45:32,718 INFO L470 AbstractCegarLoop]: Abstraction has 47 states and 51 transitions. [2021-11-13 17:45:32,719 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 2.0) internal successors, (22), 11 states have internal predecessors, (22), 8 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-13 17:45:32,719 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 51 transitions. [2021-11-13 17:45:32,721 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-11-13 17:45:32,721 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:45:32,722 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 8, 8, 7, 1, 1, 1, 1, 1, 1] [2021-11-13 17:45:32,734 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-13 17:45:32,927 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:45:32,927 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 17:45:32,927 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:45:32,928 INFO L85 PathProgramCache]: Analyzing trace with hash 1772193846, now seen corresponding path program 7 times [2021-11-13 17:45:32,928 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:45:32,928 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1920433598] [2021-11-13 17:45:32,928 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:45:32,928 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:45:32,942 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 17:45:32,943 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1802082711] [2021-11-13 17:45:32,943 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-13 17:45:32,943 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:45:32,943 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:45:32,944 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:45:32,972 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-13 17:45:33,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:45:33,196 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-13 17:45:33,200 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:45:33,526 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 16 proven. 84 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2021-11-13 17:45:33,526 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:45:33,706 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:45:33,706 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1920433598] [2021-11-13 17:45:33,706 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 17:45:33,706 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1802082711] [2021-11-13 17:45:33,706 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1802082711] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:45:33,706 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-13 17:45:33,706 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2021-11-13 17:45:33,707 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1822932871] [2021-11-13 17:45:33,707 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-13 17:45:33,709 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-13 17:45:33,710 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:45:33,710 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-13 17:45:33,710 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2021-11-13 17:45:33,711 INFO L87 Difference]: Start difference. First operand 47 states and 51 transitions. Second operand has 13 states, 12 states have (on average 2.0) internal successors, (24), 12 states have internal predecessors, (24), 9 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-13 17:45:33,944 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:45:33,944 INFO L93 Difference]: Finished difference Result 55 states and 60 transitions. [2021-11-13 17:45:33,944 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-13 17:45:33,944 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 2.0) internal successors, (24), 12 states have internal predecessors, (24), 9 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) Word has length 62 [2021-11-13 17:45:33,945 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:45:33,945 INFO L225 Difference]: With dead ends: 55 [2021-11-13 17:45:33,946 INFO L226 Difference]: Without dead ends: 50 [2021-11-13 17:45:33,946 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 59 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=52, Invalid=254, Unknown=0, NotChecked=0, Total=306 [2021-11-13 17:45:33,947 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 2 mSDsluCounter, 261 mSDsCounter, 0 mSdLazyCounter, 196 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 167.87ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 294 SdHoareTripleChecker+Invalid, 196 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.83ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 196 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 192.80ms IncrementalHoareTripleChecker+Time [2021-11-13 17:45:33,947 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 294 Invalid, 196 Unknown, 0 Unchecked, 2.83ms Time], IncrementalHoareTripleChecker [0 Valid, 196 Invalid, 0 Unknown, 0 Unchecked, 192.80ms Time] [2021-11-13 17:45:33,947 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-11-13 17:45:33,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2021-11-13 17:45:33,956 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 35 states have (on average 1.0285714285714285) internal successors, (36), 35 states have internal predecessors, (36), 10 states have call successors, (10), 5 states have call predecessors, (10), 4 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-11-13 17:45:33,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 55 transitions. [2021-11-13 17:45:33,959 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 55 transitions. Word has length 62 [2021-11-13 17:45:33,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:45:33,960 INFO L470 AbstractCegarLoop]: Abstraction has 50 states and 55 transitions. [2021-11-13 17:45:33,960 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 2.0) internal successors, (24), 12 states have internal predecessors, (24), 9 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-13 17:45:33,960 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 55 transitions. [2021-11-13 17:45:33,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-13 17:45:33,965 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:45:33,965 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 9, 9, 8, 1, 1, 1, 1, 1, 1] [2021-11-13 17:45:33,971 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-13 17:45:34,165 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-13 17:45:34,166 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 17:45:34,166 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:45:34,166 INFO L85 PathProgramCache]: Analyzing trace with hash 1288149244, now seen corresponding path program 8 times [2021-11-13 17:45:34,166 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:45:34,166 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1333342220] [2021-11-13 17:45:34,166 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:45:34,167 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:45:34,171 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 17:45:34,172 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [618965630] [2021-11-13 17:45:34,172 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-13 17:45:34,172 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:45:34,172 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:45:34,183 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:45:34,187 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-13 17:45:34,690 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-13 17:45:34,690 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 17:45:34,692 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 40 conjunts are in the unsatisfiable core [2021-11-13 17:45:34,695 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:45:35,080 INFO L134 CoverageAnalysis]: Checked inductivity of 270 backedges. 18 proven. 108 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2021-11-13 17:45:35,080 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:45:35,261 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:45:35,261 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1333342220] [2021-11-13 17:45:35,262 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 17:45:35,262 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [618965630] [2021-11-13 17:45:35,262 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [618965630] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:45:35,262 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-13 17:45:35,262 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2021-11-13 17:45:35,262 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1997216690] [2021-11-13 17:45:35,262 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-13 17:45:35,263 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-13 17:45:35,263 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:45:35,263 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-13 17:45:35,263 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2021-11-13 17:45:35,264 INFO L87 Difference]: Start difference. First operand 50 states and 55 transitions. Second operand has 14 states, 13 states have (on average 2.0) internal successors, (26), 13 states have internal predecessors, (26), 10 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-11-13 17:45:35,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:45:35,509 INFO L93 Difference]: Finished difference Result 58 states and 64 transitions. [2021-11-13 17:45:35,509 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-13 17:45:35,509 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 2.0) internal successors, (26), 13 states have internal predecessors, (26), 10 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) Word has length 69 [2021-11-13 17:45:35,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:45:35,510 INFO L225 Difference]: With dead ends: 58 [2021-11-13 17:45:35,510 INFO L226 Difference]: Without dead ends: 53 [2021-11-13 17:45:35,511 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 65 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=55, Invalid=287, Unknown=0, NotChecked=0, Total=342 [2021-11-13 17:45:35,511 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 2 mSDsluCounter, 309 mSDsCounter, 0 mSdLazyCounter, 237 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 177.10ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 345 SdHoareTripleChecker+Invalid, 237 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.92ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 237 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 206.59ms IncrementalHoareTripleChecker+Time [2021-11-13 17:45:35,512 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 345 Invalid, 237 Unknown, 0 Unchecked, 2.92ms Time], IncrementalHoareTripleChecker [0 Valid, 237 Invalid, 0 Unknown, 0 Unchecked, 206.59ms Time] [2021-11-13 17:45:35,512 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-11-13 17:45:35,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2021-11-13 17:45:35,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 37 states have (on average 1.027027027027027) internal successors, (38), 37 states have internal predecessors, (38), 11 states have call successors, (11), 5 states have call predecessors, (11), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-11-13 17:45:35,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 59 transitions. [2021-11-13 17:45:35,520 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 59 transitions. Word has length 69 [2021-11-13 17:45:35,520 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:45:35,520 INFO L470 AbstractCegarLoop]: Abstraction has 53 states and 59 transitions. [2021-11-13 17:45:35,521 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 2.0) internal successors, (26), 13 states have internal predecessors, (26), 10 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-11-13 17:45:35,521 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 59 transitions. [2021-11-13 17:45:35,522 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-11-13 17:45:35,522 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:45:35,522 INFO L514 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 10, 10, 9, 1, 1, 1, 1, 1, 1] [2021-11-13 17:45:35,543 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-13 17:45:35,729 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:45:35,729 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 17:45:35,730 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:45:35,730 INFO L85 PathProgramCache]: Analyzing trace with hash 500710774, now seen corresponding path program 9 times [2021-11-13 17:45:35,730 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:45:35,731 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [533959407] [2021-11-13 17:45:35,731 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:45:35,731 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:45:35,740 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 17:45:35,741 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1396528508] [2021-11-13 17:45:35,741 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 17:45:35,741 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:45:35,741 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:45:35,742 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:45:35,747 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-13 17:45:36,613 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-11-13 17:45:36,613 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 17:45:36,615 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 44 conjunts are in the unsatisfiable core [2021-11-13 17:45:36,617 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:45:37,016 INFO L134 CoverageAnalysis]: Checked inductivity of 335 backedges. 20 proven. 135 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2021-11-13 17:45:37,016 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:45:37,197 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:45:37,197 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [533959407] [2021-11-13 17:45:37,197 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 17:45:37,197 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1396528508] [2021-11-13 17:45:37,198 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1396528508] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:45:37,198 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-13 17:45:37,198 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2021-11-13 17:45:37,198 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1432040292] [2021-11-13 17:45:37,198 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-13 17:45:37,199 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-13 17:45:37,199 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:45:37,199 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-13 17:45:37,200 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2021-11-13 17:45:37,200 INFO L87 Difference]: Start difference. First operand 53 states and 59 transitions. Second operand has 15 states, 14 states have (on average 2.0) internal successors, (28), 14 states have internal predecessors, (28), 11 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-11-13 17:45:37,455 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:45:37,455 INFO L93 Difference]: Finished difference Result 61 states and 68 transitions. [2021-11-13 17:45:37,456 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-13 17:45:37,456 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 2.0) internal successors, (28), 14 states have internal predecessors, (28), 11 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) Word has length 76 [2021-11-13 17:45:37,456 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:45:37,457 INFO L225 Difference]: With dead ends: 61 [2021-11-13 17:45:37,457 INFO L226 Difference]: Without dead ends: 56 [2021-11-13 17:45:37,457 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 71 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=58, Invalid=322, Unknown=0, NotChecked=0, Total=380 [2021-11-13 17:45:37,458 INFO L933 BasicCegarLoop]: 39 mSDtfsCounter, 2 mSDsluCounter, 361 mSDsCounter, 0 mSdLazyCounter, 282 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 172.29ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 400 SdHoareTripleChecker+Invalid, 282 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.06ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 282 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 217.37ms IncrementalHoareTripleChecker+Time [2021-11-13 17:45:37,458 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 400 Invalid, 282 Unknown, 0 Unchecked, 3.06ms Time], IncrementalHoareTripleChecker [0 Valid, 282 Invalid, 0 Unknown, 0 Unchecked, 217.37ms Time] [2021-11-13 17:45:37,459 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-11-13 17:45:37,467 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2021-11-13 17:45:37,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 39 states have (on average 1.0256410256410255) internal successors, (40), 39 states have internal predecessors, (40), 12 states have call successors, (12), 5 states have call predecessors, (12), 4 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-11-13 17:45:37,468 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 63 transitions. [2021-11-13 17:45:37,468 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 63 transitions. Word has length 76 [2021-11-13 17:45:37,468 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:45:37,468 INFO L470 AbstractCegarLoop]: Abstraction has 56 states and 63 transitions. [2021-11-13 17:45:37,469 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 2.0) internal successors, (28), 14 states have internal predecessors, (28), 11 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-11-13 17:45:37,469 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 63 transitions. [2021-11-13 17:45:37,470 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-11-13 17:45:37,470 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:45:37,470 INFO L514 BasicCegarLoop]: trace histogram [12, 11, 11, 11, 11, 11, 10, 1, 1, 1, 1, 1, 1] [2021-11-13 17:45:37,475 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2021-11-13 17:45:37,675 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:45:37,675 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 17:45:37,675 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:45:37,676 INFO L85 PathProgramCache]: Analyzing trace with hash -1126794308, now seen corresponding path program 10 times [2021-11-13 17:45:37,676 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:45:37,676 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [171545335] [2021-11-13 17:45:37,676 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:45:37,676 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:45:37,686 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 17:45:37,686 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [108325274] [2021-11-13 17:45:37,687 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-13 17:45:37,687 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:45:37,687 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:45:37,692 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:45:37,704 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-13 17:45:38,488 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-13 17:45:38,488 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 17:45:38,490 INFO L263 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 48 conjunts are in the unsatisfiable core [2021-11-13 17:45:38,492 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:45:38,938 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 22 proven. 165 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2021-11-13 17:45:38,938 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:45:39,110 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:45:39,110 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [171545335] [2021-11-13 17:45:39,111 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 17:45:39,111 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [108325274] [2021-11-13 17:45:39,111 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [108325274] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:45:39,111 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-13 17:45:39,111 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2021-11-13 17:45:39,111 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1670246888] [2021-11-13 17:45:39,111 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-13 17:45:39,112 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-13 17:45:39,112 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:45:39,112 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-13 17:45:39,112 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2021-11-13 17:45:39,113 INFO L87 Difference]: Start difference. First operand 56 states and 63 transitions. Second operand has 16 states, 15 states have (on average 2.0) internal successors, (30), 15 states have internal predecessors, (30), 12 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-11-13 17:45:39,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:45:39,404 INFO L93 Difference]: Finished difference Result 64 states and 72 transitions. [2021-11-13 17:45:39,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-13 17:45:39,404 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 2.0) internal successors, (30), 15 states have internal predecessors, (30), 12 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) Word has length 83 [2021-11-13 17:45:39,405 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:45:39,406 INFO L225 Difference]: With dead ends: 64 [2021-11-13 17:45:39,407 INFO L226 Difference]: Without dead ends: 59 [2021-11-13 17:45:39,407 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 77 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=61, Invalid=359, Unknown=0, NotChecked=0, Total=420 [2021-11-13 17:45:39,411 INFO L933 BasicCegarLoop]: 42 mSDtfsCounter, 2 mSDsluCounter, 417 mSDsCounter, 0 mSdLazyCounter, 331 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 221.01ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 459 SdHoareTripleChecker+Invalid, 331 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.32ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 331 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 255.57ms IncrementalHoareTripleChecker+Time [2021-11-13 17:45:39,412 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 459 Invalid, 331 Unknown, 0 Unchecked, 3.32ms Time], IncrementalHoareTripleChecker [0 Valid, 331 Invalid, 0 Unknown, 0 Unchecked, 255.57ms Time] [2021-11-13 17:45:39,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-11-13 17:45:39,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2021-11-13 17:45:39,428 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 41 states have (on average 1.024390243902439) internal successors, (42), 41 states have internal predecessors, (42), 13 states have call successors, (13), 5 states have call predecessors, (13), 4 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-11-13 17:45:39,429 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 67 transitions. [2021-11-13 17:45:39,429 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 67 transitions. Word has length 83 [2021-11-13 17:45:39,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:45:39,430 INFO L470 AbstractCegarLoop]: Abstraction has 59 states and 67 transitions. [2021-11-13 17:45:39,430 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 2.0) internal successors, (30), 15 states have internal predecessors, (30), 12 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-11-13 17:45:39,430 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 67 transitions. [2021-11-13 17:45:39,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2021-11-13 17:45:39,437 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:45:39,437 INFO L514 BasicCegarLoop]: trace histogram [13, 12, 12, 12, 12, 12, 11, 1, 1, 1, 1, 1, 1] [2021-11-13 17:45:39,443 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-13 17:45:39,643 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-13 17:45:39,643 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 17:45:39,643 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:45:39,643 INFO L85 PathProgramCache]: Analyzing trace with hash -729234762, now seen corresponding path program 11 times [2021-11-13 17:45:39,643 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:45:39,643 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [916479153] [2021-11-13 17:45:39,644 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:45:39,644 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:45:39,655 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 17:45:39,655 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [862317046] [2021-11-13 17:45:39,655 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-13 17:45:39,655 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:45:39,655 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:45:39,657 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:45:39,663 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-13 17:45:40,500 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2021-11-13 17:45:40,501 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 17:45:40,503 INFO L263 TraceCheckSpWp]: Trace formula consists of 246 conjuncts, 52 conjunts are in the unsatisfiable core [2021-11-13 17:45:40,505 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:45:41,002 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 24 proven. 198 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2021-11-13 17:45:41,002 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:45:41,185 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:45:41,185 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [916479153] [2021-11-13 17:45:41,185 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 17:45:41,185 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [862317046] [2021-11-13 17:45:41,185 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [862317046] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:45:41,185 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-13 17:45:41,186 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2021-11-13 17:45:41,186 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [911005605] [2021-11-13 17:45:41,186 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-13 17:45:41,186 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-13 17:45:41,187 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:45:41,187 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-13 17:45:41,187 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2021-11-13 17:45:41,187 INFO L87 Difference]: Start difference. First operand 59 states and 67 transitions. Second operand has 17 states, 16 states have (on average 2.0) internal successors, (32), 16 states have internal predecessors, (32), 13 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-11-13 17:45:41,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:45:41,481 INFO L93 Difference]: Finished difference Result 67 states and 76 transitions. [2021-11-13 17:45:41,482 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-13 17:45:41,482 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 2.0) internal successors, (32), 16 states have internal predecessors, (32), 13 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) Word has length 90 [2021-11-13 17:45:41,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:45:41,483 INFO L225 Difference]: With dead ends: 67 [2021-11-13 17:45:41,483 INFO L226 Difference]: Without dead ends: 62 [2021-11-13 17:45:41,483 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 83 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=64, Invalid=398, Unknown=0, NotChecked=0, Total=462 [2021-11-13 17:45:41,484 INFO L933 BasicCegarLoop]: 45 mSDtfsCounter, 2 mSDsluCounter, 477 mSDsCounter, 0 mSdLazyCounter, 384 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 211.12ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 522 SdHoareTripleChecker+Invalid, 384 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.39ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 384 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 255.17ms IncrementalHoareTripleChecker+Time [2021-11-13 17:45:41,484 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 522 Invalid, 384 Unknown, 0 Unchecked, 3.39ms Time], IncrementalHoareTripleChecker [0 Valid, 384 Invalid, 0 Unknown, 0 Unchecked, 255.17ms Time] [2021-11-13 17:45:41,485 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-11-13 17:45:41,492 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 62. [2021-11-13 17:45:41,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 43 states have (on average 1.0232558139534884) internal successors, (44), 43 states have internal predecessors, (44), 14 states have call successors, (14), 5 states have call predecessors, (14), 4 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2021-11-13 17:45:41,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 71 transitions. [2021-11-13 17:45:41,493 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 71 transitions. Word has length 90 [2021-11-13 17:45:41,493 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:45:41,494 INFO L470 AbstractCegarLoop]: Abstraction has 62 states and 71 transitions. [2021-11-13 17:45:41,494 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 2.0) internal successors, (32), 16 states have internal predecessors, (32), 13 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-11-13 17:45:41,494 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 71 transitions. [2021-11-13 17:45:41,495 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2021-11-13 17:45:41,495 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:45:41,495 INFO L514 BasicCegarLoop]: trace histogram [14, 13, 13, 13, 13, 13, 12, 1, 1, 1, 1, 1, 1] [2021-11-13 17:45:41,502 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-13 17:45:41,701 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-13 17:45:41,701 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 17:45:41,707 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:45:41,707 INFO L85 PathProgramCache]: Analyzing trace with hash 348229244, now seen corresponding path program 12 times [2021-11-13 17:45:41,707 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:45:41,708 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1734419410] [2021-11-13 17:45:41,708 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:45:41,708 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:45:41,729 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 17:45:41,732 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [204205408] [2021-11-13 17:45:41,733 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-13 17:45:41,733 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:45:41,733 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:45:41,734 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:45:41,771 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-13 17:45:43,011 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2021-11-13 17:45:43,012 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 17:45:43,016 INFO L263 TraceCheckSpWp]: Trace formula consists of 263 conjuncts, 56 conjunts are in the unsatisfiable core [2021-11-13 17:45:43,019 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:45:43,507 INFO L134 CoverageAnalysis]: Checked inductivity of 572 backedges. 26 proven. 234 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2021-11-13 17:45:43,507 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:45:43,737 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:45:43,737 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1734419410] [2021-11-13 17:45:43,737 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 17:45:43,737 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [204205408] [2021-11-13 17:45:43,737 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [204205408] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:45:43,737 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-13 17:45:43,737 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2021-11-13 17:45:43,737 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1563562888] [2021-11-13 17:45:43,737 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-13 17:45:43,738 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-13 17:45:43,738 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:45:43,738 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-13 17:45:43,739 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2021-11-13 17:45:43,739 INFO L87 Difference]: Start difference. First operand 62 states and 71 transitions. Second operand has 18 states, 17 states have (on average 2.0) internal successors, (34), 17 states have internal predecessors, (34), 14 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2021-11-13 17:45:44,085 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:45:44,085 INFO L93 Difference]: Finished difference Result 70 states and 80 transitions. [2021-11-13 17:45:44,086 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-13 17:45:44,086 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 2.0) internal successors, (34), 17 states have internal predecessors, (34), 14 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) Word has length 97 [2021-11-13 17:45:44,086 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:45:44,087 INFO L225 Difference]: With dead ends: 70 [2021-11-13 17:45:44,087 INFO L226 Difference]: Without dead ends: 65 [2021-11-13 17:45:44,087 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 89 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=67, Invalid=439, Unknown=0, NotChecked=0, Total=506 [2021-11-13 17:45:44,088 INFO L933 BasicCegarLoop]: 48 mSDtfsCounter, 2 mSDsluCounter, 541 mSDsCounter, 0 mSdLazyCounter, 441 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 266.70ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 589 SdHoareTripleChecker+Invalid, 441 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.55ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 441 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 308.69ms IncrementalHoareTripleChecker+Time [2021-11-13 17:45:44,088 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 589 Invalid, 441 Unknown, 0 Unchecked, 3.55ms Time], IncrementalHoareTripleChecker [0 Valid, 441 Invalid, 0 Unknown, 0 Unchecked, 308.69ms Time] [2021-11-13 17:45:44,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-11-13 17:45:44,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2021-11-13 17:45:44,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 45 states have (on average 1.0222222222222221) internal successors, (46), 45 states have internal predecessors, (46), 15 states have call successors, (15), 5 states have call predecessors, (15), 4 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2021-11-13 17:45:44,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 75 transitions. [2021-11-13 17:45:44,097 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 75 transitions. Word has length 97 [2021-11-13 17:45:44,097 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:45:44,097 INFO L470 AbstractCegarLoop]: Abstraction has 65 states and 75 transitions. [2021-11-13 17:45:44,097 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 2.0) internal successors, (34), 17 states have internal predecessors, (34), 14 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2021-11-13 17:45:44,098 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 75 transitions. [2021-11-13 17:45:44,099 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2021-11-13 17:45:44,099 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:45:44,099 INFO L514 BasicCegarLoop]: trace histogram [15, 14, 14, 14, 14, 14, 13, 1, 1, 1, 1, 1, 1] [2021-11-13 17:45:44,112 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-13 17:45:44,305 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-13 17:45:44,305 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 17:45:44,305 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:45:44,305 INFO L85 PathProgramCache]: Analyzing trace with hash -1941497866, now seen corresponding path program 13 times [2021-11-13 17:45:44,305 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:45:44,306 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1051380683] [2021-11-13 17:45:44,306 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:45:44,306 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:45:44,312 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 17:45:44,313 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [619278966] [2021-11-13 17:45:44,313 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-13 17:45:44,313 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:45:44,313 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:45:44,314 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:45:44,329 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-13 17:45:45,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:45:45,681 INFO L263 TraceCheckSpWp]: Trace formula consists of 280 conjuncts, 60 conjunts are in the unsatisfiable core [2021-11-13 17:45:45,683 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:45:46,212 INFO L134 CoverageAnalysis]: Checked inductivity of 665 backedges. 28 proven. 273 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2021-11-13 17:45:46,212 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:45:46,493 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:45:46,493 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1051380683] [2021-11-13 17:45:46,493 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 17:45:46,493 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [619278966] [2021-11-13 17:45:46,493 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [619278966] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:45:46,494 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-13 17:45:46,494 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2021-11-13 17:45:46,494 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [496562712] [2021-11-13 17:45:46,494 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-13 17:45:46,495 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-13 17:45:46,495 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:45:46,495 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-13 17:45:46,495 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2021-11-13 17:45:46,496 INFO L87 Difference]: Start difference. First operand 65 states and 75 transitions. Second operand has 19 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 15 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2021-11-13 17:45:46,964 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:45:46,964 INFO L93 Difference]: Finished difference Result 73 states and 84 transitions. [2021-11-13 17:45:46,964 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-13 17:45:46,965 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 15 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) Word has length 104 [2021-11-13 17:45:46,965 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:45:46,966 INFO L225 Difference]: With dead ends: 73 [2021-11-13 17:45:46,966 INFO L226 Difference]: Without dead ends: 68 [2021-11-13 17:45:46,967 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 95 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=70, Invalid=482, Unknown=0, NotChecked=0, Total=552 [2021-11-13 17:45:46,967 INFO L933 BasicCegarLoop]: 51 mSDtfsCounter, 2 mSDsluCounter, 609 mSDsCounter, 0 mSdLazyCounter, 502 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 357.55ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 660 SdHoareTripleChecker+Invalid, 502 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 5.12ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 502 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 421.01ms IncrementalHoareTripleChecker+Time [2021-11-13 17:45:46,968 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 660 Invalid, 502 Unknown, 0 Unchecked, 5.12ms Time], IncrementalHoareTripleChecker [0 Valid, 502 Invalid, 0 Unknown, 0 Unchecked, 421.01ms Time] [2021-11-13 17:45:46,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-11-13 17:45:46,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2021-11-13 17:45:46,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 47 states have (on average 1.0212765957446808) internal successors, (48), 47 states have internal predecessors, (48), 16 states have call successors, (16), 5 states have call predecessors, (16), 4 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-11-13 17:45:46,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 79 transitions. [2021-11-13 17:45:46,978 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 79 transitions. Word has length 104 [2021-11-13 17:45:46,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:45:46,978 INFO L470 AbstractCegarLoop]: Abstraction has 68 states and 79 transitions. [2021-11-13 17:45:46,979 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 15 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2021-11-13 17:45:46,979 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 79 transitions. [2021-11-13 17:45:46,980 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-11-13 17:45:46,980 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:45:46,980 INFO L514 BasicCegarLoop]: trace histogram [16, 15, 15, 15, 15, 15, 14, 1, 1, 1, 1, 1, 1] [2021-11-13 17:45:46,992 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-13 17:45:47,185 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-13 17:45:47,185 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 17:45:47,186 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:45:47,186 INFO L85 PathProgramCache]: Analyzing trace with hash -2022387396, now seen corresponding path program 14 times [2021-11-13 17:45:47,186 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:45:47,186 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1615931043] [2021-11-13 17:45:47,186 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:45:47,186 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:45:47,192 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 17:45:47,192 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1639515189] [2021-11-13 17:45:47,192 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-13 17:45:47,192 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:45:47,193 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:45:47,194 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:45:47,212 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-13 17:45:48,018 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-13 17:45:48,019 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 17:45:48,021 INFO L263 TraceCheckSpWp]: Trace formula consists of 297 conjuncts, 64 conjunts are in the unsatisfiable core [2021-11-13 17:45:48,023 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:45:48,630 INFO L134 CoverageAnalysis]: Checked inductivity of 765 backedges. 30 proven. 315 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2021-11-13 17:45:48,630 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:45:48,833 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:45:48,833 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1615931043] [2021-11-13 17:45:48,833 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 17:45:48,833 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1639515189] [2021-11-13 17:45:48,833 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1639515189] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:45:48,833 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-13 17:45:48,833 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2021-11-13 17:45:48,834 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2062295295] [2021-11-13 17:45:48,834 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-13 17:45:48,834 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-13 17:45:48,834 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:45:48,834 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-13 17:45:48,835 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2021-11-13 17:45:48,835 INFO L87 Difference]: Start difference. First operand 68 states and 79 transitions. Second operand has 20 states, 19 states have (on average 2.0) internal successors, (38), 19 states have internal predecessors, (38), 16 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-11-13 17:45:49,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:45:49,314 INFO L93 Difference]: Finished difference Result 76 states and 88 transitions. [2021-11-13 17:45:49,314 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-13 17:45:49,314 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 2.0) internal successors, (38), 19 states have internal predecessors, (38), 16 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) Word has length 111 [2021-11-13 17:45:49,315 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:45:49,316 INFO L225 Difference]: With dead ends: 76 [2021-11-13 17:45:49,316 INFO L226 Difference]: Without dead ends: 71 [2021-11-13 17:45:49,317 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 101 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=73, Invalid=527, Unknown=0, NotChecked=0, Total=600 [2021-11-13 17:45:49,317 INFO L933 BasicCegarLoop]: 54 mSDtfsCounter, 2 mSDsluCounter, 681 mSDsCounter, 0 mSdLazyCounter, 567 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 364.00ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 735 SdHoareTripleChecker+Invalid, 567 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 9.29ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 567 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 420.79ms IncrementalHoareTripleChecker+Time [2021-11-13 17:45:49,318 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 735 Invalid, 567 Unknown, 0 Unchecked, 9.29ms Time], IncrementalHoareTripleChecker [0 Valid, 567 Invalid, 0 Unknown, 0 Unchecked, 420.79ms Time] [2021-11-13 17:45:49,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-11-13 17:45:49,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 71. [2021-11-13 17:45:49,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 49 states have (on average 1.0204081632653061) internal successors, (50), 49 states have internal predecessors, (50), 17 states have call successors, (17), 5 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 17:45:49,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 83 transitions. [2021-11-13 17:45:49,334 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 83 transitions. Word has length 111 [2021-11-13 17:45:49,336 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:45:49,336 INFO L470 AbstractCegarLoop]: Abstraction has 71 states and 83 transitions. [2021-11-13 17:45:49,336 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 2.0) internal successors, (38), 19 states have internal predecessors, (38), 16 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-11-13 17:45:49,336 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 83 transitions. [2021-11-13 17:45:49,338 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2021-11-13 17:45:49,338 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:45:49,338 INFO L514 BasicCegarLoop]: trace histogram [17, 16, 16, 16, 16, 16, 15, 1, 1, 1, 1, 1, 1] [2021-11-13 17:45:49,344 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-13 17:45:49,543 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:45:49,544 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 17:45:49,544 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:45:49,544 INFO L85 PathProgramCache]: Analyzing trace with hash 816266550, now seen corresponding path program 15 times [2021-11-13 17:45:49,544 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:45:49,544 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1636646664] [2021-11-13 17:45:49,544 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:45:49,545 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:45:49,550 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 17:45:49,550 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [177408536] [2021-11-13 17:45:49,550 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 17:45:49,550 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:45:49,551 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:45:49,553 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:45:49,565 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-13 17:45:51,336 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2021-11-13 17:45:51,336 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 17:45:51,339 INFO L263 TraceCheckSpWp]: Trace formula consists of 314 conjuncts, 68 conjunts are in the unsatisfiable core [2021-11-13 17:45:51,341 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:45:51,893 INFO L134 CoverageAnalysis]: Checked inductivity of 872 backedges. 32 proven. 360 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2021-11-13 17:45:51,893 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:45:52,122 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:45:52,122 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1636646664] [2021-11-13 17:45:52,122 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 17:45:52,122 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [177408536] [2021-11-13 17:45:52,122 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [177408536] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:45:52,122 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-13 17:45:52,123 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2021-11-13 17:45:52,123 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1081217066] [2021-11-13 17:45:52,123 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-13 17:45:52,123 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-11-13 17:45:52,123 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:45:52,124 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-11-13 17:45:52,124 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2021-11-13 17:45:52,124 INFO L87 Difference]: Start difference. First operand 71 states and 83 transitions. Second operand has 21 states, 20 states have (on average 2.0) internal successors, (40), 20 states have internal predecessors, (40), 17 states have call successors, (17), 2 states have call predecessors, (17), 1 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2021-11-13 17:45:52,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:45:52,605 INFO L93 Difference]: Finished difference Result 79 states and 92 transitions. [2021-11-13 17:45:52,620 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-13 17:45:52,621 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 2.0) internal successors, (40), 20 states have internal predecessors, (40), 17 states have call successors, (17), 2 states have call predecessors, (17), 1 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) Word has length 118 [2021-11-13 17:45:52,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:45:52,622 INFO L225 Difference]: With dead ends: 79 [2021-11-13 17:45:52,622 INFO L226 Difference]: Without dead ends: 74 [2021-11-13 17:45:52,623 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 107 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=76, Invalid=574, Unknown=0, NotChecked=0, Total=650 [2021-11-13 17:45:52,624 INFO L933 BasicCegarLoop]: 57 mSDtfsCounter, 2 mSDsluCounter, 757 mSDsCounter, 0 mSdLazyCounter, 636 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 378.63ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 814 SdHoareTripleChecker+Invalid, 636 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.71ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 636 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 436.04ms IncrementalHoareTripleChecker+Time [2021-11-13 17:45:52,624 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 814 Invalid, 636 Unknown, 0 Unchecked, 4.71ms Time], IncrementalHoareTripleChecker [0 Valid, 636 Invalid, 0 Unknown, 0 Unchecked, 436.04ms Time] [2021-11-13 17:45:52,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2021-11-13 17:45:52,643 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 74. [2021-11-13 17:45:52,643 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 51 states have (on average 1.0196078431372548) internal successors, (52), 51 states have internal predecessors, (52), 18 states have call successors, (18), 5 states have call predecessors, (18), 4 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) [2021-11-13 17:45:52,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 87 transitions. [2021-11-13 17:45:52,644 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 87 transitions. Word has length 118 [2021-11-13 17:45:52,645 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:45:52,645 INFO L470 AbstractCegarLoop]: Abstraction has 74 states and 87 transitions. [2021-11-13 17:45:52,645 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 20 states have (on average 2.0) internal successors, (40), 20 states have internal predecessors, (40), 17 states have call successors, (17), 2 states have call predecessors, (17), 1 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2021-11-13 17:45:52,645 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 87 transitions. [2021-11-13 17:45:52,647 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2021-11-13 17:45:52,647 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:45:52,647 INFO L514 BasicCegarLoop]: trace histogram [18, 17, 17, 17, 17, 17, 16, 1, 1, 1, 1, 1, 1] [2021-11-13 17:45:52,652 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-13 17:45:52,851 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-13 17:45:52,852 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 17:45:52,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:45:52,852 INFO L85 PathProgramCache]: Analyzing trace with hash -1159969796, now seen corresponding path program 16 times [2021-11-13 17:45:52,853 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:45:52,853 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1738032049] [2021-11-13 17:45:52,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:45:52,853 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:45:52,863 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 17:45:52,864 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [703956718] [2021-11-13 17:45:52,864 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-13 17:45:52,864 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:45:52,864 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:45:52,865 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:45:52,875 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-13 17:45:54,432 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-13 17:45:54,432 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 17:45:54,436 INFO L263 TraceCheckSpWp]: Trace formula consists of 331 conjuncts, 72 conjunts are in the unsatisfiable core [2021-11-13 17:45:54,438 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:45:55,033 INFO L134 CoverageAnalysis]: Checked inductivity of 986 backedges. 34 proven. 408 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2021-11-13 17:45:55,033 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:45:55,220 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:45:55,221 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1738032049] [2021-11-13 17:45:55,221 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 17:45:55,221 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [703956718] [2021-11-13 17:45:55,221 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [703956718] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:45:55,221 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-13 17:45:55,221 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2021-11-13 17:45:55,221 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1015171760] [2021-11-13 17:45:55,221 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-13 17:45:55,222 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-13 17:45:55,222 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:45:55,222 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-13 17:45:55,222 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2021-11-13 17:45:55,223 INFO L87 Difference]: Start difference. First operand 74 states and 87 transitions. Second operand has 22 states, 21 states have (on average 2.0) internal successors, (42), 21 states have internal predecessors, (42), 18 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) [2021-11-13 17:45:55,712 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:45:55,712 INFO L93 Difference]: Finished difference Result 82 states and 96 transitions. [2021-11-13 17:45:55,713 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-13 17:45:55,713 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 2.0) internal successors, (42), 21 states have internal predecessors, (42), 18 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) Word has length 125 [2021-11-13 17:45:55,714 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:45:55,714 INFO L225 Difference]: With dead ends: 82 [2021-11-13 17:45:55,715 INFO L226 Difference]: Without dead ends: 77 [2021-11-13 17:45:55,715 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 113 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=79, Invalid=623, Unknown=0, NotChecked=0, Total=702 [2021-11-13 17:45:55,716 INFO L933 BasicCegarLoop]: 60 mSDtfsCounter, 2 mSDsluCounter, 837 mSDsCounter, 0 mSdLazyCounter, 709 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 368.29ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 897 SdHoareTripleChecker+Invalid, 709 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.59ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 709 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 445.38ms IncrementalHoareTripleChecker+Time [2021-11-13 17:45:55,716 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 897 Invalid, 709 Unknown, 0 Unchecked, 4.59ms Time], IncrementalHoareTripleChecker [0 Valid, 709 Invalid, 0 Unknown, 0 Unchecked, 445.38ms Time] [2021-11-13 17:45:55,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-11-13 17:45:55,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2021-11-13 17:45:55,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 53 states have (on average 1.0188679245283019) internal successors, (54), 53 states have internal predecessors, (54), 19 states have call successors, (19), 5 states have call predecessors, (19), 4 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) [2021-11-13 17:45:55,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 91 transitions. [2021-11-13 17:45:55,724 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 91 transitions. Word has length 125 [2021-11-13 17:45:55,725 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:45:55,725 INFO L470 AbstractCegarLoop]: Abstraction has 77 states and 91 transitions. [2021-11-13 17:45:55,725 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 21 states have (on average 2.0) internal successors, (42), 21 states have internal predecessors, (42), 18 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) [2021-11-13 17:45:55,725 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 91 transitions. [2021-11-13 17:45:55,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2021-11-13 17:45:55,727 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:45:55,727 INFO L514 BasicCegarLoop]: trace histogram [19, 18, 18, 18, 18, 18, 17, 1, 1, 1, 1, 1, 1] [2021-11-13 17:45:55,743 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-13 17:45:55,933 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:45:55,933 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 17:45:55,934 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:45:55,934 INFO L85 PathProgramCache]: Analyzing trace with hash -633523594, now seen corresponding path program 17 times [2021-11-13 17:45:55,934 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:45:55,934 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [597135105] [2021-11-13 17:45:55,934 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:45:55,934 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:45:55,940 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 17:45:55,940 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [609662225] [2021-11-13 17:45:55,941 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-13 17:45:55,941 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:45:55,941 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:45:55,950 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:45:55,952 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-13 17:45:57,140 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2021-11-13 17:45:57,140 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 17:45:57,143 INFO L263 TraceCheckSpWp]: Trace formula consists of 348 conjuncts, 76 conjunts are in the unsatisfiable core [2021-11-13 17:45:57,145 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:45:57,837 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 36 proven. 459 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2021-11-13 17:45:57,837 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:45:58,079 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:45:58,080 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [597135105] [2021-11-13 17:45:58,080 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 17:45:58,080 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [609662225] [2021-11-13 17:45:58,080 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [609662225] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:45:58,080 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-13 17:45:58,080 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2021-11-13 17:45:58,081 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1489866693] [2021-11-13 17:45:58,081 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-13 17:45:58,081 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-13 17:45:58,081 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:45:58,082 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-13 17:45:58,082 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2021-11-13 17:45:58,083 INFO L87 Difference]: Start difference. First operand 77 states and 91 transitions. Second operand has 23 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 19 states have call successors, (19), 2 states have call predecessors, (19), 1 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) [2021-11-13 17:45:58,645 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:45:58,645 INFO L93 Difference]: Finished difference Result 85 states and 100 transitions. [2021-11-13 17:45:58,645 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-13 17:45:58,645 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 19 states have call successors, (19), 2 states have call predecessors, (19), 1 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) Word has length 132 [2021-11-13 17:45:58,646 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:45:58,647 INFO L225 Difference]: With dead ends: 85 [2021-11-13 17:45:58,647 INFO L226 Difference]: Without dead ends: 80 [2021-11-13 17:45:58,648 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 119 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=82, Invalid=674, Unknown=0, NotChecked=0, Total=756 [2021-11-13 17:45:58,648 INFO L933 BasicCegarLoop]: 63 mSDtfsCounter, 2 mSDsluCounter, 921 mSDsCounter, 0 mSdLazyCounter, 786 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 437.17ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 984 SdHoareTripleChecker+Invalid, 786 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.69ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 786 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 515.76ms IncrementalHoareTripleChecker+Time [2021-11-13 17:45:58,649 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 984 Invalid, 786 Unknown, 0 Unchecked, 4.69ms Time], IncrementalHoareTripleChecker [0 Valid, 786 Invalid, 0 Unknown, 0 Unchecked, 515.76ms Time] [2021-11-13 17:45:58,649 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-11-13 17:45:58,657 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 80. [2021-11-13 17:45:58,657 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 55 states have (on average 1.018181818181818) internal successors, (56), 55 states have internal predecessors, (56), 20 states have call successors, (20), 5 states have call predecessors, (20), 4 states have return successors, (19), 19 states have call predecessors, (19), 19 states have call successors, (19) [2021-11-13 17:45:58,658 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 95 transitions. [2021-11-13 17:45:58,658 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 95 transitions. Word has length 132 [2021-11-13 17:45:58,658 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:45:58,658 INFO L470 AbstractCegarLoop]: Abstraction has 80 states and 95 transitions. [2021-11-13 17:45:58,659 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 19 states have call successors, (19), 2 states have call predecessors, (19), 1 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) [2021-11-13 17:45:58,659 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 95 transitions. [2021-11-13 17:45:58,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2021-11-13 17:45:58,661 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:45:58,661 INFO L514 BasicCegarLoop]: trace histogram [20, 19, 19, 19, 19, 19, 18, 1, 1, 1, 1, 1, 1] [2021-11-13 17:45:58,686 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-13 17:45:58,867 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:45:58,867 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 17:45:58,867 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:45:58,867 INFO L85 PathProgramCache]: Analyzing trace with hash -2015107396, now seen corresponding path program 18 times [2021-11-13 17:45:58,867 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:45:58,868 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [464381628] [2021-11-13 17:45:58,868 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:45:58,868 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:45:58,874 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 17:45:58,875 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [530363318] [2021-11-13 17:45:58,875 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-13 17:45:58,875 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:45:58,875 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:45:58,883 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:45:58,887 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-13 17:46:01,112 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2021-11-13 17:46:01,112 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 17:46:01,117 INFO L263 TraceCheckSpWp]: Trace formula consists of 365 conjuncts, 80 conjunts are in the unsatisfiable core [2021-11-13 17:46:01,119 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:46:01,816 INFO L134 CoverageAnalysis]: Checked inductivity of 1235 backedges. 38 proven. 513 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2021-11-13 17:46:01,816 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:46:02,016 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:46:02,016 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [464381628] [2021-11-13 17:46:02,016 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 17:46:02,016 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [530363318] [2021-11-13 17:46:02,016 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [530363318] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:46:02,016 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-13 17:46:02,016 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2021-11-13 17:46:02,016 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1824589437] [2021-11-13 17:46:02,016 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-13 17:46:02,017 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-13 17:46:02,017 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:46:02,017 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-13 17:46:02,017 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2021-11-13 17:46:02,018 INFO L87 Difference]: Start difference. First operand 80 states and 95 transitions. Second operand has 24 states, 23 states have (on average 2.0) internal successors, (46), 23 states have internal predecessors, (46), 20 states have call successors, (20), 2 states have call predecessors, (20), 1 states have return successors, (19), 19 states have call predecessors, (19), 19 states have call successors, (19) [2021-11-13 17:46:02,618 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:46:02,618 INFO L93 Difference]: Finished difference Result 88 states and 104 transitions. [2021-11-13 17:46:02,619 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-13 17:46:02,619 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 2.0) internal successors, (46), 23 states have internal predecessors, (46), 20 states have call successors, (20), 2 states have call predecessors, (20), 1 states have return successors, (19), 19 states have call predecessors, (19), 19 states have call successors, (19) Word has length 139 [2021-11-13 17:46:02,619 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:46:02,620 INFO L225 Difference]: With dead ends: 88 [2021-11-13 17:46:02,620 INFO L226 Difference]: Without dead ends: 83 [2021-11-13 17:46:02,621 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 125 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=85, Invalid=727, Unknown=0, NotChecked=0, Total=812 [2021-11-13 17:46:02,621 INFO L933 BasicCegarLoop]: 66 mSDtfsCounter, 2 mSDsluCounter, 1009 mSDsCounter, 0 mSdLazyCounter, 867 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 466.54ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 1075 SdHoareTripleChecker+Invalid, 867 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.68ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 867 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 552.54ms IncrementalHoareTripleChecker+Time [2021-11-13 17:46:02,621 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 1075 Invalid, 867 Unknown, 0 Unchecked, 4.68ms Time], IncrementalHoareTripleChecker [0 Valid, 867 Invalid, 0 Unknown, 0 Unchecked, 552.54ms Time] [2021-11-13 17:46:02,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-11-13 17:46:02,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 83. [2021-11-13 17:46:02,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 57 states have (on average 1.0175438596491229) internal successors, (58), 57 states have internal predecessors, (58), 21 states have call successors, (21), 5 states have call predecessors, (21), 4 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2021-11-13 17:46:02,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 99 transitions. [2021-11-13 17:46:02,631 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 99 transitions. Word has length 139 [2021-11-13 17:46:02,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:46:02,632 INFO L470 AbstractCegarLoop]: Abstraction has 83 states and 99 transitions. [2021-11-13 17:46:02,632 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 2.0) internal successors, (46), 23 states have internal predecessors, (46), 20 states have call successors, (20), 2 states have call predecessors, (20), 1 states have return successors, (19), 19 states have call predecessors, (19), 19 states have call successors, (19) [2021-11-13 17:46:02,632 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 99 transitions. [2021-11-13 17:46:02,634 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2021-11-13 17:46:02,634 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:46:02,634 INFO L514 BasicCegarLoop]: trace histogram [21, 20, 20, 20, 20, 20, 19, 1, 1, 1, 1, 1, 1] [2021-11-13 17:46:02,662 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-13 17:46:02,840 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:46:02,840 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 17:46:02,841 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:46:02,841 INFO L85 PathProgramCache]: Analyzing trace with hash 245168054, now seen corresponding path program 19 times [2021-11-13 17:46:02,841 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:46:02,841 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [132620280] [2021-11-13 17:46:02,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:46:02,841 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:46:02,847 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 17:46:02,847 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [806785114] [2021-11-13 17:46:02,847 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-13 17:46:02,847 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:46:02,848 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:46:02,849 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:46:02,854 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-13 17:46:03,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:46:03,991 INFO L263 TraceCheckSpWp]: Trace formula consists of 382 conjuncts, 84 conjunts are in the unsatisfiable core [2021-11-13 17:46:03,994 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:46:04,691 INFO L134 CoverageAnalysis]: Checked inductivity of 1370 backedges. 40 proven. 570 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2021-11-13 17:46:04,692 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:46:04,918 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:46:04,919 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [132620280] [2021-11-13 17:46:04,919 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 17:46:04,919 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [806785114] [2021-11-13 17:46:04,919 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [806785114] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:46:04,919 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-13 17:46:04,919 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2021-11-13 17:46:04,919 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [408545079] [2021-11-13 17:46:04,919 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-13 17:46:04,920 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-13 17:46:04,920 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:46:04,920 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-13 17:46:04,921 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2021-11-13 17:46:04,921 INFO L87 Difference]: Start difference. First operand 83 states and 99 transitions. Second operand has 25 states, 24 states have (on average 2.0) internal successors, (48), 24 states have internal predecessors, (48), 21 states have call successors, (21), 2 states have call predecessors, (21), 1 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2021-11-13 17:46:05,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:46:05,764 INFO L93 Difference]: Finished difference Result 91 states and 108 transitions. [2021-11-13 17:46:05,764 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-13 17:46:05,764 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 2.0) internal successors, (48), 24 states have internal predecessors, (48), 21 states have call successors, (21), 2 states have call predecessors, (21), 1 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) Word has length 146 [2021-11-13 17:46:05,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:46:05,766 INFO L225 Difference]: With dead ends: 91 [2021-11-13 17:46:05,766 INFO L226 Difference]: Without dead ends: 86 [2021-11-13 17:46:05,766 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 131 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=88, Invalid=782, Unknown=0, NotChecked=0, Total=870 [2021-11-13 17:46:05,767 INFO L933 BasicCegarLoop]: 69 mSDtfsCounter, 2 mSDsluCounter, 1101 mSDsCounter, 0 mSdLazyCounter, 952 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 666.65ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 1170 SdHoareTripleChecker+Invalid, 952 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 6.18ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 952 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 780.54ms IncrementalHoareTripleChecker+Time [2021-11-13 17:46:05,767 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 1170 Invalid, 952 Unknown, 0 Unchecked, 6.18ms Time], IncrementalHoareTripleChecker [0 Valid, 952 Invalid, 0 Unknown, 0 Unchecked, 780.54ms Time] [2021-11-13 17:46:05,768 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-11-13 17:46:05,777 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 86. [2021-11-13 17:46:05,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 59 states have (on average 1.0169491525423728) internal successors, (60), 59 states have internal predecessors, (60), 22 states have call successors, (22), 5 states have call predecessors, (22), 4 states have return successors, (21), 21 states have call predecessors, (21), 21 states have call successors, (21) [2021-11-13 17:46:05,778 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 103 transitions. [2021-11-13 17:46:05,779 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 103 transitions. Word has length 146 [2021-11-13 17:46:05,779 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:46:05,779 INFO L470 AbstractCegarLoop]: Abstraction has 86 states and 103 transitions. [2021-11-13 17:46:05,780 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 24 states have (on average 2.0) internal successors, (48), 24 states have internal predecessors, (48), 21 states have call successors, (21), 2 states have call predecessors, (21), 1 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2021-11-13 17:46:05,780 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 103 transitions. [2021-11-13 17:46:05,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2021-11-13 17:46:05,782 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:46:05,782 INFO L514 BasicCegarLoop]: trace histogram [22, 21, 21, 21, 21, 21, 20, 1, 1, 1, 1, 1, 1] [2021-11-13 17:46:05,801 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-13 17:46:05,988 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-11-13 17:46:05,988 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 17:46:05,989 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:46:05,989 INFO L85 PathProgramCache]: Analyzing trace with hash -1166558852, now seen corresponding path program 20 times [2021-11-13 17:46:05,989 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:46:05,989 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [956634013] [2021-11-13 17:46:05,989 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:46:05,989 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:46:05,996 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 17:46:05,996 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [539245433] [2021-11-13 17:46:05,996 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-13 17:46:05,996 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:46:05,996 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:46:05,998 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:46:05,999 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-13 17:46:06,678 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-13 17:46:06,678 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 17:46:06,682 INFO L263 TraceCheckSpWp]: Trace formula consists of 399 conjuncts, 88 conjunts are in the unsatisfiable core [2021-11-13 17:46:06,685 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:46:07,439 INFO L134 CoverageAnalysis]: Checked inductivity of 1512 backedges. 42 proven. 630 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2021-11-13 17:46:07,439 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:46:07,689 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:46:07,689 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [956634013] [2021-11-13 17:46:07,689 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 17:46:07,689 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [539245433] [2021-11-13 17:46:07,689 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [539245433] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:46:07,690 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-13 17:46:07,690 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2021-11-13 17:46:07,690 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [221112023] [2021-11-13 17:46:07,690 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-13 17:46:07,691 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-13 17:46:07,691 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:46:07,691 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-13 17:46:07,691 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2021-11-13 17:46:07,692 INFO L87 Difference]: Start difference. First operand 86 states and 103 transitions. Second operand has 26 states, 25 states have (on average 2.0) internal successors, (50), 25 states have internal predecessors, (50), 22 states have call successors, (22), 2 states have call predecessors, (22), 1 states have return successors, (21), 21 states have call predecessors, (21), 21 states have call successors, (21) [2021-11-13 17:46:08,365 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:46:08,365 INFO L93 Difference]: Finished difference Result 94 states and 112 transitions. [2021-11-13 17:46:08,366 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-13 17:46:08,366 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 2.0) internal successors, (50), 25 states have internal predecessors, (50), 22 states have call successors, (22), 2 states have call predecessors, (22), 1 states have return successors, (21), 21 states have call predecessors, (21), 21 states have call successors, (21) Word has length 153 [2021-11-13 17:46:08,366 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:46:08,367 INFO L225 Difference]: With dead ends: 94 [2021-11-13 17:46:08,367 INFO L226 Difference]: Without dead ends: 89 [2021-11-13 17:46:08,368 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 137 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=91, Invalid=839, Unknown=0, NotChecked=0, Total=930 [2021-11-13 17:46:08,368 INFO L933 BasicCegarLoop]: 72 mSDtfsCounter, 2 mSDsluCounter, 1197 mSDsCounter, 0 mSdLazyCounter, 1041 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 540.37ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 1269 SdHoareTripleChecker+Invalid, 1041 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.63ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1041 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 621.98ms IncrementalHoareTripleChecker+Time [2021-11-13 17:46:08,369 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 1269 Invalid, 1041 Unknown, 0 Unchecked, 4.63ms Time], IncrementalHoareTripleChecker [0 Valid, 1041 Invalid, 0 Unknown, 0 Unchecked, 621.98ms Time] [2021-11-13 17:46:08,369 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-11-13 17:46:08,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 89. [2021-11-13 17:46:08,378 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 61 states have (on average 1.0163934426229508) internal successors, (62), 61 states have internal predecessors, (62), 23 states have call successors, (23), 5 states have call predecessors, (23), 4 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2021-11-13 17:46:08,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 107 transitions. [2021-11-13 17:46:08,379 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 107 transitions. Word has length 153 [2021-11-13 17:46:08,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:46:08,380 INFO L470 AbstractCegarLoop]: Abstraction has 89 states and 107 transitions. [2021-11-13 17:46:08,380 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 2.0) internal successors, (50), 25 states have internal predecessors, (50), 22 states have call successors, (22), 2 states have call predecessors, (22), 1 states have return successors, (21), 21 states have call predecessors, (21), 21 states have call successors, (21) [2021-11-13 17:46:08,380 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 107 transitions. [2021-11-13 17:46:08,382 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2021-11-13 17:46:08,382 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:46:08,382 INFO L514 BasicCegarLoop]: trace histogram [23, 22, 22, 22, 22, 22, 21, 1, 1, 1, 1, 1, 1] [2021-11-13 17:46:08,401 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-13 17:46:08,592 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-11-13 17:46:08,593 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 17:46:08,593 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:46:08,594 INFO L85 PathProgramCache]: Analyzing trace with hash 5934326, now seen corresponding path program 21 times [2021-11-13 17:46:08,594 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:46:08,594 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1089534031] [2021-11-13 17:46:08,594 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:46:08,594 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:46:08,600 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 17:46:08,601 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [290088421] [2021-11-13 17:46:08,601 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 17:46:08,601 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:46:08,601 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:46:08,602 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:46:08,603 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-13 17:46:09,518 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2021-11-13 17:46:09,518 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 17:46:09,522 INFO L263 TraceCheckSpWp]: Trace formula consists of 416 conjuncts, 92 conjunts are in the unsatisfiable core [2021-11-13 17:46:09,525 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:46:10,334 INFO L134 CoverageAnalysis]: Checked inductivity of 1661 backedges. 44 proven. 693 refuted. 0 times theorem prover too weak. 924 trivial. 0 not checked. [2021-11-13 17:46:10,334 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:46:10,634 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:46:10,635 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1089534031] [2021-11-13 17:46:10,635 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 17:46:10,636 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [290088421] [2021-11-13 17:46:10,636 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [290088421] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:46:10,636 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-13 17:46:10,636 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2021-11-13 17:46:10,636 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1781512611] [2021-11-13 17:46:10,636 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-13 17:46:10,637 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-13 17:46:10,637 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:46:10,637 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-13 17:46:10,638 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2021-11-13 17:46:10,638 INFO L87 Difference]: Start difference. First operand 89 states and 107 transitions. Second operand has 27 states, 26 states have (on average 2.0) internal successors, (52), 26 states have internal predecessors, (52), 23 states have call successors, (23), 2 states have call predecessors, (23), 1 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2021-11-13 17:46:11,408 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:46:11,408 INFO L93 Difference]: Finished difference Result 97 states and 116 transitions. [2021-11-13 17:46:11,409 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-13 17:46:11,409 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 2.0) internal successors, (52), 26 states have internal predecessors, (52), 23 states have call successors, (23), 2 states have call predecessors, (23), 1 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) Word has length 160 [2021-11-13 17:46:11,409 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:46:11,410 INFO L225 Difference]: With dead ends: 97 [2021-11-13 17:46:11,410 INFO L226 Difference]: Without dead ends: 92 [2021-11-13 17:46:11,410 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 143 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=94, Invalid=898, Unknown=0, NotChecked=0, Total=992 [2021-11-13 17:46:11,411 INFO L933 BasicCegarLoop]: 75 mSDtfsCounter, 2 mSDsluCounter, 1297 mSDsCounter, 0 mSdLazyCounter, 1134 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 615.15ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 1372 SdHoareTripleChecker+Invalid, 1134 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.96ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1134 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 716.68ms IncrementalHoareTripleChecker+Time [2021-11-13 17:46:11,411 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 1372 Invalid, 1134 Unknown, 0 Unchecked, 4.96ms Time], IncrementalHoareTripleChecker [0 Valid, 1134 Invalid, 0 Unknown, 0 Unchecked, 716.68ms Time] [2021-11-13 17:46:11,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2021-11-13 17:46:11,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 92. [2021-11-13 17:46:11,420 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 63 states have (on average 1.0158730158730158) internal successors, (64), 63 states have internal predecessors, (64), 24 states have call successors, (24), 5 states have call predecessors, (24), 4 states have return successors, (23), 23 states have call predecessors, (23), 23 states have call successors, (23) [2021-11-13 17:46:11,421 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 111 transitions. [2021-11-13 17:46:11,421 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 111 transitions. Word has length 160 [2021-11-13 17:46:11,422 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:46:11,422 INFO L470 AbstractCegarLoop]: Abstraction has 92 states and 111 transitions. [2021-11-13 17:46:11,422 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 26 states have (on average 2.0) internal successors, (52), 26 states have internal predecessors, (52), 23 states have call successors, (23), 2 states have call predecessors, (23), 1 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2021-11-13 17:46:11,423 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 111 transitions. [2021-11-13 17:46:11,424 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2021-11-13 17:46:11,424 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:46:11,424 INFO L514 BasicCegarLoop]: trace histogram [24, 23, 23, 23, 23, 23, 22, 1, 1, 1, 1, 1, 1] [2021-11-13 17:46:11,429 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-11-13 17:46:11,628 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:46:11,629 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 17:46:11,629 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:46:11,629 INFO L85 PathProgramCache]: Analyzing trace with hash -779895748, now seen corresponding path program 22 times [2021-11-13 17:46:11,629 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:46:11,629 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1495643427] [2021-11-13 17:46:11,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:46:11,629 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:46:11,634 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 17:46:11,634 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [821606558] [2021-11-13 17:46:11,634 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-13 17:46:11,634 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:46:11,635 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:46:11,643 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:46:11,643 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-13 17:46:13,378 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-13 17:46:13,384 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 17:46:13,389 INFO L263 TraceCheckSpWp]: Trace formula consists of 433 conjuncts, 96 conjunts are in the unsatisfiable core [2021-11-13 17:46:13,392 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:46:14,188 INFO L134 CoverageAnalysis]: Checked inductivity of 1817 backedges. 46 proven. 759 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2021-11-13 17:46:14,188 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:46:14,387 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:46:14,387 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1495643427] [2021-11-13 17:46:14,387 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 17:46:14,387 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [821606558] [2021-11-13 17:46:14,387 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [821606558] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:46:14,387 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-13 17:46:14,387 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2021-11-13 17:46:14,387 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1133719141] [2021-11-13 17:46:14,388 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-13 17:46:14,388 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-13 17:46:14,388 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:46:14,389 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-13 17:46:14,389 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2021-11-13 17:46:14,389 INFO L87 Difference]: Start difference. First operand 92 states and 111 transitions. Second operand has 28 states, 27 states have (on average 2.0) internal successors, (54), 27 states have internal predecessors, (54), 24 states have call successors, (24), 2 states have call predecessors, (24), 1 states have return successors, (23), 23 states have call predecessors, (23), 23 states have call successors, (23) [2021-11-13 17:46:15,126 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:46:15,126 INFO L93 Difference]: Finished difference Result 100 states and 120 transitions. [2021-11-13 17:46:15,126 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-13 17:46:15,126 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 27 states have (on average 2.0) internal successors, (54), 27 states have internal predecessors, (54), 24 states have call successors, (24), 2 states have call predecessors, (24), 1 states have return successors, (23), 23 states have call predecessors, (23), 23 states have call successors, (23) Word has length 167 [2021-11-13 17:46:15,127 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:46:15,128 INFO L225 Difference]: With dead ends: 100 [2021-11-13 17:46:15,128 INFO L226 Difference]: Without dead ends: 95 [2021-11-13 17:46:15,129 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 149 SyntacticMatches, 1 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=97, Invalid=959, Unknown=0, NotChecked=0, Total=1056 [2021-11-13 17:46:15,129 INFO L933 BasicCegarLoop]: 78 mSDtfsCounter, 2 mSDsluCounter, 1401 mSDsCounter, 0 mSdLazyCounter, 1231 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 590.13ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 1479 SdHoareTripleChecker+Invalid, 1231 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.25ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1231 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 678.81ms IncrementalHoareTripleChecker+Time [2021-11-13 17:46:15,130 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 1479 Invalid, 1231 Unknown, 0 Unchecked, 4.25ms Time], IncrementalHoareTripleChecker [0 Valid, 1231 Invalid, 0 Unknown, 0 Unchecked, 678.81ms Time] [2021-11-13 17:46:15,130 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2021-11-13 17:46:15,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 95. [2021-11-13 17:46:15,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 65 states have (on average 1.0153846153846153) internal successors, (66), 65 states have internal predecessors, (66), 25 states have call successors, (25), 5 states have call predecessors, (25), 4 states have return successors, (24), 24 states have call predecessors, (24), 24 states have call successors, (24) [2021-11-13 17:46:15,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 115 transitions. [2021-11-13 17:46:15,159 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 115 transitions. Word has length 167 [2021-11-13 17:46:15,159 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:46:15,160 INFO L470 AbstractCegarLoop]: Abstraction has 95 states and 115 transitions. [2021-11-13 17:46:15,160 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 27 states have (on average 2.0) internal successors, (54), 27 states have internal predecessors, (54), 24 states have call successors, (24), 2 states have call predecessors, (24), 1 states have return successors, (23), 23 states have call predecessors, (23), 23 states have call successors, (23) [2021-11-13 17:46:15,160 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 115 transitions. [2021-11-13 17:46:15,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 175 [2021-11-13 17:46:15,161 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:46:15,162 INFO L514 BasicCegarLoop]: trace histogram [25, 24, 24, 24, 24, 24, 23, 1, 1, 1, 1, 1, 1] [2021-11-13 17:46:15,167 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-11-13 17:46:15,365 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:46:15,365 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 17:46:15,366 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:46:15,366 INFO L85 PathProgramCache]: Analyzing trace with hash -821431754, now seen corresponding path program 23 times [2021-11-13 17:46:15,366 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:46:15,366 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [780379254] [2021-11-13 17:46:15,366 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:46:15,366 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:46:15,373 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 17:46:15,375 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [894839248] [2021-11-13 17:46:15,375 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-13 17:46:15,375 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:46:15,375 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:46:15,376 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:46:15,389 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-13 17:46:17,443 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 24 check-sat command(s) [2021-11-13 17:46:17,443 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 17:46:17,448 INFO L263 TraceCheckSpWp]: Trace formula consists of 450 conjuncts, 100 conjunts are in the unsatisfiable core [2021-11-13 17:46:17,452 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:46:18,317 INFO L134 CoverageAnalysis]: Checked inductivity of 1980 backedges. 48 proven. 828 refuted. 0 times theorem prover too weak. 1104 trivial. 0 not checked. [2021-11-13 17:46:18,318 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:46:18,529 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:46:18,529 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [780379254] [2021-11-13 17:46:18,530 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-13 17:46:18,530 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [894839248] [2021-11-13 17:46:18,530 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [894839248] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:46:18,530 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-13 17:46:18,530 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2021-11-13 17:46:18,530 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [371808924] [2021-11-13 17:46:18,530 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-13 17:46:18,531 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-13 17:46:18,531 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:46:18,531 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-13 17:46:18,532 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2021-11-13 17:46:18,532 INFO L87 Difference]: Start difference. First operand 95 states and 115 transitions. Second operand has 29 states, 28 states have (on average 2.0) internal successors, (56), 28 states have internal predecessors, (56), 25 states have call successors, (25), 2 states have call predecessors, (25), 1 states have return successors, (24), 24 states have call predecessors, (24), 24 states have call successors, (24) [2021-11-13 17:46:19,345 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:46:19,345 INFO L93 Difference]: Finished difference Result 103 states and 124 transitions. [2021-11-13 17:46:19,346 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-13 17:46:19,346 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 28 states have (on average 2.0) internal successors, (56), 28 states have internal predecessors, (56), 25 states have call successors, (25), 2 states have call predecessors, (25), 1 states have return successors, (24), 24 states have call predecessors, (24), 24 states have call successors, (24) Word has length 174 [2021-11-13 17:46:19,346 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:46:19,347 INFO L225 Difference]: With dead ends: 103 [2021-11-13 17:46:19,347 INFO L226 Difference]: Without dead ends: 98 [2021-11-13 17:46:19,348 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 155 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=100, Invalid=1022, Unknown=0, NotChecked=0, Total=1122 [2021-11-13 17:46:19,349 INFO L933 BasicCegarLoop]: 81 mSDtfsCounter, 2 mSDsluCounter, 1509 mSDsCounter, 0 mSdLazyCounter, 1332 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 649.69ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 1590 SdHoareTripleChecker+Invalid, 1332 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.57ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1332 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 758.17ms IncrementalHoareTripleChecker+Time [2021-11-13 17:46:19,349 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 1590 Invalid, 1332 Unknown, 0 Unchecked, 4.57ms Time], IncrementalHoareTripleChecker [0 Valid, 1332 Invalid, 0 Unknown, 0 Unchecked, 758.17ms Time] [2021-11-13 17:46:19,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2021-11-13 17:46:19,358 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 98. [2021-11-13 17:46:19,359 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 67 states have (on average 1.0149253731343284) internal successors, (68), 67 states have internal predecessors, (68), 26 states have call successors, (26), 5 states have call predecessors, (26), 4 states have return successors, (25), 25 states have call predecessors, (25), 25 states have call successors, (25) [2021-11-13 17:46:19,360 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 119 transitions. [2021-11-13 17:46:19,360 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 119 transitions. Word has length 174 [2021-11-13 17:46:19,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:46:19,361 INFO L470 AbstractCegarLoop]: Abstraction has 98 states and 119 transitions. [2021-11-13 17:46:19,361 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 28 states have (on average 2.0) internal successors, (56), 28 states have internal predecessors, (56), 25 states have call successors, (25), 2 states have call predecessors, (25), 1 states have return successors, (24), 24 states have call predecessors, (24), 24 states have call successors, (24) [2021-11-13 17:46:19,361 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 119 transitions. [2021-11-13 17:46:19,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 182 [2021-11-13 17:46:19,363 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:46:19,363 INFO L514 BasicCegarLoop]: trace histogram [26, 25, 25, 25, 25, 25, 24, 1, 1, 1, 1, 1, 1] [2021-11-13 17:46:19,385 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2021-11-13 17:46:19,569 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-11-13 17:46:19,570 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 17:46:19,570 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:46:19,571 INFO L85 PathProgramCache]: Analyzing trace with hash -1091309828, now seen corresponding path program 24 times [2021-11-13 17:46:19,571 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:46:19,571 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [357659084] [2021-11-13 17:46:19,571 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:46:19,571 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:46:19,576 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-13 17:46:19,576 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1283347649] [2021-11-13 17:46:19,577 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-13 17:46:19,577 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:46:19,577 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:46:19,577 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:46:19,578 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f1d5be8-ab50-4108-b052-3a82a28b7fd1/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process