./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/ps4-ll_unwindbound20.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 53f42b1a Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/ps4-ll_unwindbound20.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 99e5cccea54789cc7c8b01ece41ae38ca7afc8c38f73e2884988b8ff4c6bfc25 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-21 00:42:50,519 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-21 00:42:50,521 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-21 00:42:50,575 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-21 00:42:50,576 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-21 00:42:50,580 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-21 00:42:50,582 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-21 00:42:50,586 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-21 00:42:50,589 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-21 00:42:50,594 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-21 00:42:50,596 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-21 00:42:50,598 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-21 00:42:50,598 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-21 00:42:50,601 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-21 00:42:50,603 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-21 00:42:50,607 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-21 00:42:50,609 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-21 00:42:50,610 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-21 00:42:50,612 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-21 00:42:50,620 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-21 00:42:50,622 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-21 00:42:50,623 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-21 00:42:50,626 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-21 00:42:50,627 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-21 00:42:50,636 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-21 00:42:50,637 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-21 00:42:50,637 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-21 00:42:50,639 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-21 00:42:50,640 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-21 00:42:50,641 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-21 00:42:50,642 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-21 00:42:50,642 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-21 00:42:50,644 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-21 00:42:50,646 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-21 00:42:50,647 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-21 00:42:50,647 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-21 00:42:50,648 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-21 00:42:50,648 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-21 00:42:50,649 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-21 00:42:50,650 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-21 00:42:50,650 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-21 00:42:50,651 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-21 00:42:50,694 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-21 00:42:50,694 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-21 00:42:50,695 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-21 00:42:50,695 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-21 00:42:50,696 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-21 00:42:50,696 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-21 00:42:50,697 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-21 00:42:50,697 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-21 00:42:50,697 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-21 00:42:50,697 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-21 00:42:50,698 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-21 00:42:50,699 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-21 00:42:50,699 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-21 00:42:50,699 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-21 00:42:50,699 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-21 00:42:50,700 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-21 00:42:50,700 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-21 00:42:50,700 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-21 00:42:50,701 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-21 00:42:50,701 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-21 00:42:50,701 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-21 00:42:50,702 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-21 00:42:50,702 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-21 00:42:50,702 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-21 00:42:50,702 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-21 00:42:50,702 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-21 00:42:50,704 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-21 00:42:50,704 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-21 00:42:50,704 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-21 00:42:50,705 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-21 00:42:50,705 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-21 00:42:50,705 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-21 00:42:50,706 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 00:42:50,706 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-21 00:42:50,706 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-21 00:42:50,706 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-21 00:42:50,707 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-21 00:42:50,707 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-21 00:42:50,707 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-21 00:42:50,707 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-21 00:42:50,707 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-21 00:42:50,708 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES 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_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 99e5cccea54789cc7c8b01ece41ae38ca7afc8c38f73e2884988b8ff4c6bfc25 [2021-11-21 00:42:51,046 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-21 00:42:51,080 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-21 00:42:51,082 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-21 00:42:51,083 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-21 00:42:51,084 INFO L275 PluginConnector]: CDTParser initialized [2021-11-21 00:42:51,086 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/nla-digbench-scaling/ps4-ll_unwindbound20.c [2021-11-21 00:42:51,160 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/data/c3ec7c5be/338df35240ad46a6818509c55c425afe/FLAG302285585 [2021-11-21 00:42:51,640 INFO L306 CDTParser]: Found 1 translation units. [2021-11-21 00:42:51,641 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/sv-benchmarks/c/nla-digbench-scaling/ps4-ll_unwindbound20.c [2021-11-21 00:42:51,653 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/data/c3ec7c5be/338df35240ad46a6818509c55c425afe/FLAG302285585 [2021-11-21 00:42:51,981 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/data/c3ec7c5be/338df35240ad46a6818509c55c425afe [2021-11-21 00:42:51,984 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-21 00:42:51,987 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-21 00:42:51,992 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-21 00:42:51,992 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-21 00:42:51,997 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-21 00:42:51,997 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 12:42:51" (1/1) ... [2021-11-21 00:42:51,999 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1afdea05 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:42:51, skipping insertion in model container [2021-11-21 00:42:51,999 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 12:42:51" (1/1) ... [2021-11-21 00:42:52,008 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-21 00:42:52,024 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-21 00:42:52,292 WARN L230 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_9ef0383c-3a38-4211-b47e-190ea687901d/sv-benchmarks/c/nla-digbench-scaling/ps4-ll_unwindbound20.c[458,471] [2021-11-21 00:42:52,316 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 00:42:52,327 INFO L203 MainTranslator]: Completed pre-run [2021-11-21 00:42:52,347 WARN L230 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_9ef0383c-3a38-4211-b47e-190ea687901d/sv-benchmarks/c/nla-digbench-scaling/ps4-ll_unwindbound20.c[458,471] [2021-11-21 00:42:52,369 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 00:42:52,385 INFO L208 MainTranslator]: Completed translation [2021-11-21 00:42:52,385 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:42:52 WrapperNode [2021-11-21 00:42:52,385 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-21 00:42:52,386 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-21 00:42:52,387 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-21 00:42:52,387 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-21 00:42:52,394 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:42:52" (1/1) ... [2021-11-21 00:42:52,402 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:42:52" (1/1) ... [2021-11-21 00:42:52,425 INFO L137 Inliner]: procedures = 14, calls = 10, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 39 [2021-11-21 00:42:52,425 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-21 00:42:52,427 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-21 00:42:52,427 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-21 00:42:52,427 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-21 00:42:52,436 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:42:52" (1/1) ... [2021-11-21 00:42:52,437 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:42:52" (1/1) ... [2021-11-21 00:42:52,448 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:42:52" (1/1) ... [2021-11-21 00:42:52,448 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:42:52" (1/1) ... [2021-11-21 00:42:52,457 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:42:52" (1/1) ... [2021-11-21 00:42:52,465 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:42:52" (1/1) ... [2021-11-21 00:42:52,468 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:42:52" (1/1) ... [2021-11-21 00:42:52,470 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-21 00:42:52,471 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-21 00:42:52,472 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-21 00:42:52,472 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-21 00:42:52,473 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:42:52" (1/1) ... [2021-11-21 00:42:52,480 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 00:42:52,492 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:42:52,512 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-21 00:42:52,531 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-21 00:42:52,564 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-21 00:42:52,564 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-21 00:42:52,564 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-21 00:42:52,565 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-21 00:42:52,565 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-11-21 00:42:52,565 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-11-21 00:42:52,636 INFO L236 CfgBuilder]: Building ICFG [2021-11-21 00:42:52,638 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-21 00:42:52,798 INFO L277 CfgBuilder]: Performing block encoding [2021-11-21 00:42:52,811 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-21 00:42:52,812 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-21 00:42:52,815 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 12:42:52 BoogieIcfgContainer [2021-11-21 00:42:52,815 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-21 00:42:52,817 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-21 00:42:52,817 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-21 00:42:52,821 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-21 00:42:52,821 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 12:42:51" (1/3) ... [2021-11-21 00:42:52,822 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@16e4cf92 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 12:42:52, skipping insertion in model container [2021-11-21 00:42:52,823 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:42:52" (2/3) ... [2021-11-21 00:42:52,823 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@16e4cf92 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 12:42:52, skipping insertion in model container [2021-11-21 00:42:52,823 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 12:42:52" (3/3) ... [2021-11-21 00:42:52,825 INFO L111 eAbstractionObserver]: Analyzing ICFG ps4-ll_unwindbound20.c [2021-11-21 00:42:52,831 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-21 00:42:52,832 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-21 00:42:52,885 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-21 00:42:52,893 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=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-21 00:42:52,893 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-21 00:42:52,910 INFO L276 IsEmpty]: Start isEmpty. Operand has 15 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 10 states have internal predecessors, (14), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-21 00:42:52,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-21 00:42:52,916 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:42:52,917 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-21 00:42:52,918 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:42:52,923 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:42:52,924 INFO L85 PathProgramCache]: Analyzing trace with hash -2099432067, now seen corresponding path program 1 times [2021-11-21 00:42:52,934 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:42:52,935 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1220176012] [2021-11-21 00:42:52,936 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:42:52,937 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:42:53,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:42:53,067 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:42:53,067 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:42:53,068 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1220176012] [2021-11-21 00:42:53,069 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1220176012] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:42:53,069 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:42:53,070 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-21 00:42:53,071 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [379247492] [2021-11-21 00:42:53,072 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:42:53,077 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-21 00:42:53,077 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:42:53,106 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-21 00:42:53,107 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-21 00:42:53,110 INFO L87 Difference]: Start difference. First operand has 15 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 10 states have internal predecessors, (14), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 2 states, 2 states have (on average 2.5) internal successors, (5), 2 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:42:53,134 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:42:53,135 INFO L93 Difference]: Finished difference Result 29 states and 42 transitions. [2021-11-21 00:42:53,136 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-21 00:42:53,138 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 2.5) internal successors, (5), 2 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2021-11-21 00:42:53,138 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:42:53,145 INFO L225 Difference]: With dead ends: 29 [2021-11-21 00:42:53,145 INFO L226 Difference]: Without dead ends: 13 [2021-11-21 00:42:53,148 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 [2021-11-21 00:42:53,153 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 2 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 2 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 2 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:42:53,154 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 16 Invalid, 2 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 2 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:42:53,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2021-11-21 00:42:53,187 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2021-11-21 00:42:53,188 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 8 states have (on average 1.375) internal successors, (11), 9 states have internal predecessors, (11), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-21 00:42:53,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 16 transitions. [2021-11-21 00:42:53,191 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 16 transitions. Word has length 6 [2021-11-21 00:42:53,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:42:53,192 INFO L470 AbstractCegarLoop]: Abstraction has 13 states and 16 transitions. [2021-11-21 00:42:53,192 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 2.5) internal successors, (5), 2 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:42:53,192 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 16 transitions. [2021-11-21 00:42:53,194 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-21 00:42:53,194 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:42:53,194 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:42:53,195 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-21 00:42:53,195 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:42:53,196 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:42:53,196 INFO L85 PathProgramCache]: Analyzing trace with hash -1058308380, now seen corresponding path program 1 times [2021-11-21 00:42:53,196 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:42:53,197 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1724019335] [2021-11-21 00:42:53,197 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:42:53,198 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:42:53,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:42:53,249 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:42:53,250 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:42:53,250 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1724019335] [2021-11-21 00:42:53,251 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1724019335] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:42:53,266 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:42:53,266 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 00:42:53,267 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1835961702] [2021-11-21 00:42:53,267 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:42:53,270 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:42:53,270 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:42:53,271 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:42:53,271 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:42:53,272 INFO L87 Difference]: Start difference. First operand 13 states and 16 transitions. Second operand has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:42:53,298 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:42:53,300 INFO L93 Difference]: Finished difference Result 23 states and 27 transitions. [2021-11-21 00:42:53,301 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:42:53,301 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-11-21 00:42:53,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:42:53,303 INFO L225 Difference]: With dead ends: 23 [2021-11-21 00:42:53,303 INFO L226 Difference]: Without dead ends: 15 [2021-11-21 00:42:53,304 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:42:53,307 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 0 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 9 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:42:53,310 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 38 Invalid, 9 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:42:53,311 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-11-21 00:42:53,315 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2021-11-21 00:42:53,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 10 states have (on average 1.3) internal successors, (13), 11 states have internal predecessors, (13), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-21 00:42:53,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 18 transitions. [2021-11-21 00:42:53,322 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 18 transitions. Word has length 7 [2021-11-21 00:42:53,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:42:53,323 INFO L470 AbstractCegarLoop]: Abstraction has 15 states and 18 transitions. [2021-11-21 00:42:53,324 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:42:53,325 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 18 transitions. [2021-11-21 00:42:53,326 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-21 00:42:53,326 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:42:53,327 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:42:53,328 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-21 00:42:53,328 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:42:53,329 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:42:53,330 INFO L85 PathProgramCache]: Analyzing trace with hash -1056520920, now seen corresponding path program 1 times [2021-11-21 00:42:53,331 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:42:53,332 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [189129258] [2021-11-21 00:42:53,332 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:42:53,333 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:42:53,355 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 00:42:53,360 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1358589408] [2021-11-21 00:42:53,360 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:42:53,360 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:42:53,361 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:42:53,362 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:42:53,363 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-21 00:42:53,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:42:53,417 INFO L263 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-21 00:42:53,422 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:42:53,563 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:42:53,563 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:42:53,563 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:42:53,564 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [189129258] [2021-11-21 00:42:53,564 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 00:42:53,564 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1358589408] [2021-11-21 00:42:53,565 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1358589408] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:42:53,565 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:42:53,565 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-21 00:42:53,565 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1333420749] [2021-11-21 00:42:53,566 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:42:53,566 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 00:42:53,566 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:42:53,567 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 00:42:53,567 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-21 00:42:53,567 INFO L87 Difference]: Start difference. First operand 15 states and 18 transitions. Second operand has 5 states, 5 states have (on average 1.2) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:42:53,622 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:42:53,622 INFO L93 Difference]: Finished difference Result 25 states and 30 transitions. [2021-11-21 00:42:53,623 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 00:42:53,623 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.2) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-11-21 00:42:53,623 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:42:53,624 INFO L225 Difference]: With dead ends: 25 [2021-11-21 00:42:53,624 INFO L226 Difference]: Without dead ends: 21 [2021-11-21 00:42:53,625 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 [2021-11-21 00:42:53,626 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 6 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 26 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:42:53,627 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 48 Invalid, 26 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:42:53,628 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-11-21 00:42:53,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2021-11-21 00:42:53,633 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 15 states have internal predecessors, (17), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-21 00:42:53,634 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 24 transitions. [2021-11-21 00:42:53,635 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 24 transitions. Word has length 7 [2021-11-21 00:42:53,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:42:53,635 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 24 transitions. [2021-11-21 00:42:53,635 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.2) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:42:53,635 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 24 transitions. [2021-11-21 00:42:53,636 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-21 00:42:53,636 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:42:53,636 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:42:53,664 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-21 00:42:53,854 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:42:53,855 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:42:53,856 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:42:53,856 INFO L85 PathProgramCache]: Analyzing trace with hash -640052534, now seen corresponding path program 1 times [2021-11-21 00:42:53,856 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:42:53,857 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [430461818] [2021-11-21 00:42:53,857 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:42:53,857 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:42:53,869 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 00:42:53,869 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [224933494] [2021-11-21 00:42:53,870 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:42:53,870 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:42:53,870 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:42:53,871 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:42:53,884 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-21 00:42:53,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:42:53,954 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-21 00:42:53,956 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:42:54,060 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:42:54,061 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:42:54,186 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:42:54,186 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:42:54,187 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [430461818] [2021-11-21 00:42:54,187 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 00:42:54,187 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [224933494] [2021-11-21 00:42:54,188 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [224933494] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:42:54,188 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1680807674] [2021-11-21 00:42:54,226 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 00:42:54,226 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:42:54,230 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:42:54,236 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:42:54,236 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:43:18,981 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 21 for LOIs [2021-11-21 00:43:19,086 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:43:19,508 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:43:19,508 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 00:43:19,508 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5] total 8 [2021-11-21 00:43:19,509 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1459593937] [2021-11-21 00:43:19,509 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 00:43:19,510 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-21 00:43:19,510 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:43:19,510 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-21 00:43:19,511 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=197, Unknown=0, NotChecked=0, Total=240 [2021-11-21 00:43:19,511 INFO L87 Difference]: Start difference. First operand 21 states and 24 transitions. Second operand has 8 states, 8 states have (on average 2.625) internal successors, (21), 8 states have internal predecessors, (21), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-21 00:43:19,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:43:19,629 INFO L93 Difference]: Finished difference Result 55 states and 65 transitions. [2021-11-21 00:43:19,630 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-21 00:43:19,630 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 8 states have internal predecessors, (21), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 15 [2021-11-21 00:43:19,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:43:19,634 INFO L225 Difference]: With dead ends: 55 [2021-11-21 00:43:19,634 INFO L226 Difference]: Without dead ends: 47 [2021-11-21 00:43:19,636 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=63, Invalid=279, Unknown=0, NotChecked=0, Total=342 [2021-11-21 00:43:19,641 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 35 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:43:19,642 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [35 Valid, 83 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:43:19,644 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-11-21 00:43:19,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 43. [2021-11-21 00:43:19,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 28 states have (on average 1.25) internal successors, (35), 31 states have internal predecessors, (35), 10 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-21 00:43:19,670 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 52 transitions. [2021-11-21 00:43:19,671 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 52 transitions. Word has length 15 [2021-11-21 00:43:19,671 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:43:19,671 INFO L470 AbstractCegarLoop]: Abstraction has 43 states and 52 transitions. [2021-11-21 00:43:19,671 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 8 states have internal predecessors, (21), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-21 00:43:19,671 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 52 transitions. [2021-11-21 00:43:19,672 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-21 00:43:19,672 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:43:19,672 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:43:19,695 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-21 00:43:19,872 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:43:19,873 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:43:19,873 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:43:19,873 INFO L85 PathProgramCache]: Analyzing trace with hash -638265074, now seen corresponding path program 1 times [2021-11-21 00:43:19,873 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:43:19,874 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [774960518] [2021-11-21 00:43:19,874 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:43:19,874 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:43:19,882 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 00:43:19,882 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [392473042] [2021-11-21 00:43:19,883 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:43:19,888 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:43:19,889 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:43:19,890 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:43:19,933 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-21 00:43:19,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:43:19,956 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-21 00:43:19,958 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:43:20,076 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:43:20,076 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:43:20,163 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-21 00:43:20,164 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:43:20,164 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [774960518] [2021-11-21 00:43:20,164 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 00:43:20,164 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [392473042] [2021-11-21 00:43:20,164 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [392473042] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-21 00:43:20,164 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:43:20,164 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 7 [2021-11-21 00:43:20,165 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [54058280] [2021-11-21 00:43:20,165 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:43:20,165 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 00:43:20,165 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:43:20,166 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 00:43:20,166 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-11-21 00:43:20,166 INFO L87 Difference]: Start difference. First operand 43 states and 52 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) [2021-11-21 00:43:20,198 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:43:20,198 INFO L93 Difference]: Finished difference Result 57 states and 65 transitions. [2021-11-21 00:43:20,199 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 00:43:20,199 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 15 [2021-11-21 00:43:20,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:43:20,200 INFO L225 Difference]: With dead ends: 57 [2021-11-21 00:43:20,200 INFO L226 Difference]: Without dead ends: 46 [2021-11-21 00:43:20,201 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-11-21 00:43:20,202 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 7 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:43:20,202 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 36 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 18 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:43:20,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-11-21 00:43:20,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 40. [2021-11-21 00:43:20,222 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 30 states have (on average 1.1333333333333333) internal successors, (34), 30 states have internal predecessors, (34), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-21 00:43:20,223 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 43 transitions. [2021-11-21 00:43:20,223 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 43 transitions. Word has length 15 [2021-11-21 00:43:20,224 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:43:20,224 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 43 transitions. [2021-11-21 00:43:20,224 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) [2021-11-21 00:43:20,224 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 43 transitions. [2021-11-21 00:43:20,225 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-21 00:43:20,225 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:43:20,225 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2021-11-21 00:43:20,263 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-21 00:43:20,426 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:43:20,426 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:43:20,427 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:43:20,427 INFO L85 PathProgramCache]: Analyzing trace with hash -186597301, now seen corresponding path program 1 times [2021-11-21 00:43:20,427 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:43:20,427 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1256803825] [2021-11-21 00:43:20,428 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:43:20,428 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:43:20,436 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 00:43:20,436 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1921217274] [2021-11-21 00:43:20,436 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:43:20,437 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:43:20,437 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:43:20,444 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:43:20,446 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-21 00:43:20,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:43:20,489 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-21 00:43:20,490 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:43:20,635 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 00:43:20,635 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:43:20,789 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:43:20,790 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1256803825] [2021-11-21 00:43:20,790 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 00:43:20,790 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1921217274] [2021-11-21 00:43:20,790 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1921217274] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:43:20,790 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2047931709] [2021-11-21 00:43:20,793 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 00:43:20,794 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:43:20,794 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:43:20,794 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:43:20,795 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:43:50,012 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 21 for LOIs [2021-11-21 00:43:50,115 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:43:50,665 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:43:50,665 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:43:50,665 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-11-21 00:43:50,665 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [149217716] [2021-11-21 00:43:50,666 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-21 00:43:50,666 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-21 00:43:50,666 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:43:50,666 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-21 00:43:50,667 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=289, Unknown=0, NotChecked=0, Total=342 [2021-11-21 00:43:50,667 INFO L87 Difference]: Start difference. First operand 40 states and 43 transitions. Second operand has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 6 states have internal predecessors, (13), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-21 00:43:50,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:43:50,735 INFO L93 Difference]: Finished difference Result 45 states and 47 transitions. [2021-11-21 00:43:50,736 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-21 00:43:50,736 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 6 states have internal predecessors, (13), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 21 [2021-11-21 00:43:50,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:43:50,737 INFO L225 Difference]: With dead ends: 45 [2021-11-21 00:43:50,737 INFO L226 Difference]: Without dead ends: 40 [2021-11-21 00:43:50,738 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 37 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=64, Invalid=356, Unknown=0, NotChecked=0, Total=420 [2021-11-21 00:43:50,739 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 2 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 79 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:43:50,739 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 79 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:43:50,740 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-11-21 00:43:50,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2021-11-21 00:43:50,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 30 states have (on average 1.1) internal successors, (33), 30 states have internal predecessors, (33), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-21 00:43:50,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2021-11-21 00:43:50,746 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 21 [2021-11-21 00:43:50,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:43:50,747 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2021-11-21 00:43:50,747 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 6 states have internal predecessors, (13), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-21 00:43:50,747 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2021-11-21 00:43:50,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-21 00:43:50,748 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:43:50,749 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1] [2021-11-21 00:43:50,786 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-21 00:43:50,962 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-21 00:43:50,962 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:43:50,963 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:43:50,963 INFO L85 PathProgramCache]: Analyzing trace with hash -648869455, now seen corresponding path program 2 times [2021-11-21 00:43:50,963 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:43:50,963 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [370095196] [2021-11-21 00:43:50,963 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:43:50,964 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:43:50,971 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 00:43:50,971 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1506015482] [2021-11-21 00:43:50,971 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:43:50,971 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:43:50,972 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:43:50,973 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:43:50,983 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-21 00:43:51,039 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-21 00:43:51,039 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:43:51,041 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-21 00:43:51,043 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:43:51,217 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 6 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-21 00:43:51,217 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:43:51,371 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:43:51,372 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [370095196] [2021-11-21 00:43:51,372 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 00:43:51,372 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1506015482] [2021-11-21 00:43:51,372 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1506015482] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:43:51,372 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [957325818] [2021-11-21 00:43:51,374 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 00:43:51,374 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:43:51,375 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:43:51,375 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:43:51,375 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:44:06,463 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 21 for LOIs [2021-11-21 00:44:06,542 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:44:06,988 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:44:06,988 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:44:06,988 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-11-21 00:44:06,988 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1449372712] [2021-11-21 00:44:06,988 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-21 00:44:06,989 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-21 00:44:06,989 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:44:06,989 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-21 00:44:06,990 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=324, Unknown=0, NotChecked=0, Total=380 [2021-11-21 00:44:06,990 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand has 8 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 7 states have internal predecessors, (16), 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) [2021-11-21 00:44:07,063 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:44:07,063 INFO L93 Difference]: Finished difference Result 45 states and 46 transitions. [2021-11-21 00:44:07,063 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-21 00:44:07,063 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 7 states have internal predecessors, (16), 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 29 [2021-11-21 00:44:07,064 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:44:07,064 INFO L225 Difference]: With dead ends: 45 [2021-11-21 00:44:07,065 INFO L226 Difference]: Without dead ends: 40 [2021-11-21 00:44:07,065 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 52 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=67, Invalid=395, Unknown=0, NotChecked=0, Total=462 [2021-11-21 00:44:07,066 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 2 mSDsluCounter, 96 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 114 SdHoareTripleChecker+Invalid, 54 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 54 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:44:07,066 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 114 Invalid, 54 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 54 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:44:07,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-11-21 00:44:07,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2021-11-21 00:44:07,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 30 states have (on average 1.0666666666666667) internal successors, (32), 30 states have internal predecessors, (32), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-21 00:44:07,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 41 transitions. [2021-11-21 00:44:07,072 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 41 transitions. Word has length 29 [2021-11-21 00:44:07,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:44:07,073 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 41 transitions. [2021-11-21 00:44:07,073 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 7 states have internal predecessors, (16), 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) [2021-11-21 00:44:07,073 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 41 transitions. [2021-11-21 00:44:07,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-11-21 00:44:07,074 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:44:07,074 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1] [2021-11-21 00:44:07,096 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2021-11-21 00:44:07,278 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:44:07,279 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:44:07,280 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:44:07,280 INFO L85 PathProgramCache]: Analyzing trace with hash -1028616937, now seen corresponding path program 3 times [2021-11-21 00:44:07,280 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:44:07,280 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [216067592] [2021-11-21 00:44:07,280 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:44:07,280 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:44:07,289 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 00:44:07,289 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [213835386] [2021-11-21 00:44:07,289 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:44:07,289 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:44:07,289 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:44:07,290 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:44:07,297 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-21 00:44:07,378 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:44:07,378 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:44:07,380 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-21 00:44:07,382 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:44:07,745 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 18 proven. 26 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-21 00:44:07,745 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:44:08,362 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:44:08,363 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [216067592] [2021-11-21 00:44:08,363 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 00:44:08,363 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [213835386] [2021-11-21 00:44:08,363 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [213835386] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:44:08,363 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [472172444] [2021-11-21 00:44:08,365 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 00:44:08,366 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:44:08,366 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:44:08,366 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:44:08,367 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:44:27,369 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 21 for LOIs [2021-11-21 00:44:27,457 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:44:27,974 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:44:27,974 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:44:27,974 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2021-11-21 00:44:27,974 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1691143131] [2021-11-21 00:44:27,974 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-21 00:44:27,975 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-21 00:44:27,975 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:44:27,975 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-21 00:44:27,975 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=654, Unknown=0, NotChecked=0, Total=756 [2021-11-21 00:44:27,976 INFO L87 Difference]: Start difference. First operand 40 states and 41 transitions. Second operand has 12 states, 11 states have (on average 2.0) internal successors, (22), 10 states have internal predecessors, (22), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-21 00:44:28,165 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:44:28,166 INFO L93 Difference]: Finished difference Result 51 states and 52 transitions. [2021-11-21 00:44:28,166 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-21 00:44:28,166 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 2.0) internal successors, (22), 10 states have internal predecessors, (22), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 37 [2021-11-21 00:44:28,167 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:44:28,167 INFO L225 Difference]: With dead ends: 51 [2021-11-21 00:44:28,167 INFO L226 Difference]: Without dead ends: 46 [2021-11-21 00:44:28,168 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 75 SyntacticMatches, 2 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 155 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=125, Invalid=805, Unknown=0, NotChecked=0, Total=930 [2021-11-21 00:44:28,169 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 15 mSDsluCounter, 122 mSDsCounter, 0 mSdLazyCounter, 137 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 134 SdHoareTripleChecker+Invalid, 143 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 137 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:44:28,169 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 134 Invalid, 143 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 137 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:44:28,169 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-11-21 00:44:28,175 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2021-11-21 00:44:28,175 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 34 states have (on average 1.0588235294117647) internal successors, (36), 34 states have internal predecessors, (36), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-11-21 00:44:28,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 47 transitions. [2021-11-21 00:44:28,176 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 47 transitions. Word has length 37 [2021-11-21 00:44:28,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:44:28,177 INFO L470 AbstractCegarLoop]: Abstraction has 46 states and 47 transitions. [2021-11-21 00:44:28,177 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 2.0) internal successors, (22), 10 states have internal predecessors, (22), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-21 00:44:28,177 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 47 transitions. [2021-11-21 00:44:28,178 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-21 00:44:28,178 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:44:28,179 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1] [2021-11-21 00:44:28,209 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-21 00:44:28,398 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:44:28,399 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:44:28,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:44:28,399 INFO L85 PathProgramCache]: Analyzing trace with hash 126888572, now seen corresponding path program 2 times [2021-11-21 00:44:28,399 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:44:28,400 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [401253456] [2021-11-21 00:44:28,400 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:44:28,400 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:44:28,407 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 00:44:28,409 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1324150043] [2021-11-21 00:44:28,410 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:44:28,410 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:44:28,410 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:44:28,411 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:44:28,415 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-21 00:44:28,456 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-21 00:44:28,457 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:44:28,458 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-21 00:44:28,460 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:44:28,562 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 8 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:44:28,563 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:44:28,683 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 8 proven. 32 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-21 00:44:28,683 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:44:28,683 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [401253456] [2021-11-21 00:44:28,683 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 00:44:28,684 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1324150043] [2021-11-21 00:44:28,684 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1324150043] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:44:28,684 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [893409260] [2021-11-21 00:44:28,686 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 00:44:28,686 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:44:28,686 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:44:28,687 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:44:28,687 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:45:20,029 WARN L227 SmtUtils]: Spent 18.55s on a formula simplification that was a NOOP. DAG size: 11 (called from [L1066] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2021-11-21 00:45:20,052 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 21 for LOIs [2021-11-21 00:45:20,131 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:45:20,493 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:45:20,494 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 00:45:20,494 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8] total 14 [2021-11-21 00:45:20,494 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1963741632] [2021-11-21 00:45:20,494 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 00:45:20,495 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-21 00:45:20,495 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:45:20,495 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-21 00:45:20,496 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=368, Unknown=0, NotChecked=0, Total=462 [2021-11-21 00:45:20,496 INFO L87 Difference]: Start difference. First operand 46 states and 47 transitions. Second operand has 14 states, 14 states have (on average 3.4285714285714284) internal successors, (48), 14 states have internal predecessors, (48), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-21 00:45:20,736 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:45:20,737 INFO L93 Difference]: Finished difference Result 118 states and 124 transitions. [2021-11-21 00:45:20,737 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-21 00:45:20,737 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.4285714285714284) internal successors, (48), 14 states have internal predecessors, (48), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) Word has length 39 [2021-11-21 00:45:20,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:45:20,738 INFO L225 Difference]: With dead ends: 118 [2021-11-21 00:45:20,738 INFO L226 Difference]: Without dead ends: 113 [2021-11-21 00:45:20,739 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 204 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=207, Invalid=723, Unknown=0, NotChecked=0, Total=930 [2021-11-21 00:45:20,740 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 82 mSDsluCounter, 112 mSDsCounter, 0 mSdLazyCounter, 68 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 82 SdHoareTripleChecker+Valid, 132 SdHoareTripleChecker+Invalid, 96 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 68 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:45:20,740 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [82 Valid, 132 Invalid, 96 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 68 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:45:20,741 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-11-21 00:45:20,760 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 88. [2021-11-21 00:45:20,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 66 states have (on average 1.106060606060606) internal successors, (73), 66 states have internal predecessors, (73), 11 states have call successors, (11), 11 states have call predecessors, (11), 10 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-11-21 00:45:20,764 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 94 transitions. [2021-11-21 00:45:20,765 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 94 transitions. Word has length 39 [2021-11-21 00:45:20,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:45:20,766 INFO L470 AbstractCegarLoop]: Abstraction has 88 states and 94 transitions. [2021-11-21 00:45:20,766 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 3.4285714285714284) internal successors, (48), 14 states have internal predecessors, (48), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-21 00:45:20,766 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 94 transitions. [2021-11-21 00:45:20,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-21 00:45:20,772 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:45:20,773 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1] [2021-11-21 00:45:20,813 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-21 00:45:21,002 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:45:21,002 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:45:21,003 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:45:21,003 INFO L85 PathProgramCache]: Analyzing trace with hash 387926653, now seen corresponding path program 4 times [2021-11-21 00:45:21,003 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:45:21,003 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1301215000] [2021-11-21 00:45:21,003 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:45:21,003 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:45:21,008 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 00:45:21,008 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1667311311] [2021-11-21 00:45:21,008 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:45:21,008 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:45:21,009 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:45:21,026 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:45:21,034 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-21 00:45:21,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:45:21,094 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-21 00:45:21,097 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:45:21,319 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 10 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-21 00:45:21,320 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:45:21,455 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:45:21,455 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1301215000] [2021-11-21 00:45:21,455 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 00:45:21,455 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1667311311] [2021-11-21 00:45:21,456 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1667311311] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:45:21,456 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [644604344] [2021-11-21 00:45:21,458 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 00:45:21,458 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:45:21,459 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:45:21,459 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:45:21,459 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:45:27,967 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 21 for LOIs [2021-11-21 00:45:28,066 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:45:28,503 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:45:28,504 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:45:28,504 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-11-21 00:45:28,504 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [897019704] [2021-11-21 00:45:28,504 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-21 00:45:28,505 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-21 00:45:28,505 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:45:28,505 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-21 00:45:28,506 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=400, Unknown=0, NotChecked=0, Total=462 [2021-11-21 00:45:28,506 INFO L87 Difference]: Start difference. First operand 88 states and 94 transitions. Second operand has 10 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 9 states have internal predecessors, (22), 6 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-11-21 00:45:28,624 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:45:28,624 INFO L93 Difference]: Finished difference Result 93 states and 98 transitions. [2021-11-21 00:45:28,625 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-21 00:45:28,625 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 9 states have internal predecessors, (22), 6 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Word has length 45 [2021-11-21 00:45:28,625 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:45:28,626 INFO L225 Difference]: With dead ends: 93 [2021-11-21 00:45:28,626 INFO L226 Difference]: Without dead ends: 88 [2021-11-21 00:45:28,627 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 82 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=73, Invalid=479, Unknown=0, NotChecked=0, Total=552 [2021-11-21 00:45:28,628 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 2 mSDsluCounter, 176 mSDsCounter, 0 mSdLazyCounter, 100 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 202 SdHoareTripleChecker+Invalid, 100 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 100 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:45:28,628 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 202 Invalid, 100 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 100 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:45:28,629 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-11-21 00:45:28,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2021-11-21 00:45:28,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 66 states have (on average 1.0909090909090908) internal successors, (72), 66 states have internal predecessors, (72), 11 states have call successors, (11), 11 states have call predecessors, (11), 10 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-11-21 00:45:28,639 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 93 transitions. [2021-11-21 00:45:28,639 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 93 transitions. Word has length 45 [2021-11-21 00:45:28,640 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:45:28,640 INFO L470 AbstractCegarLoop]: Abstraction has 88 states and 93 transitions. [2021-11-21 00:45:28,640 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 9 states have internal predecessors, (22), 6 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-11-21 00:45:28,640 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 93 transitions. [2021-11-21 00:45:28,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-21 00:45:28,641 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:45:28,641 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 6, 5, 1, 1, 1, 1, 1] [2021-11-21 00:45:28,679 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-21 00:45:28,866 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-21 00:45:28,866 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:45:28,867 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:45:28,867 INFO L85 PathProgramCache]: Analyzing trace with hash -1228586525, now seen corresponding path program 5 times [2021-11-21 00:45:28,867 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:45:28,867 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [949680312] [2021-11-21 00:45:28,867 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:45:28,867 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:45:28,874 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 00:45:28,874 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [725696050] [2021-11-21 00:45:28,874 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:45:28,874 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:45:28,875 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:45:28,877 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:45:28,879 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-21 00:45:29,155 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-21 00:45:29,155 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:45:29,157 INFO L263 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-21 00:45:29,159 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:45:29,423 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 12 proven. 60 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2021-11-21 00:45:29,423 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:45:29,580 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:45:29,580 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [949680312] [2021-11-21 00:45:29,580 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 00:45:29,580 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [725696050] [2021-11-21 00:45:29,580 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [725696050] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:45:29,581 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1387266861] [2021-11-21 00:45:29,583 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 00:45:29,583 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:45:29,583 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:45:29,584 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:45:29,584 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:45:56,309 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 21 for LOIs [2021-11-21 00:45:56,389 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:45:56,914 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:45:56,914 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:45:56,914 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-11-21 00:45:56,914 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1199380399] [2021-11-21 00:45:56,915 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-21 00:45:56,915 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-21 00:45:56,915 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:45:56,916 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-21 00:45:56,916 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=441, Unknown=0, NotChecked=0, Total=506 [2021-11-21 00:45:56,916 INFO L87 Difference]: Start difference. First operand 88 states and 93 transitions. Second operand has 11 states, 10 states have (on average 2.5) internal successors, (25), 10 states have internal predecessors, (25), 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) [2021-11-21 00:45:57,030 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:45:57,030 INFO L93 Difference]: Finished difference Result 93 states and 97 transitions. [2021-11-21 00:45:57,031 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-21 00:45:57,031 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 2.5) internal successors, (25), 10 states have internal predecessors, (25), 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 53 [2021-11-21 00:45:57,032 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:45:57,033 INFO L225 Difference]: With dead ends: 93 [2021-11-21 00:45:57,033 INFO L226 Difference]: Without dead ends: 88 [2021-11-21 00:45:57,033 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 97 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=76, Invalid=524, Unknown=0, NotChecked=0, Total=600 [2021-11-21 00:45:57,034 INFO L933 BasicCegarLoop]: 32 mSDtfsCounter, 2 mSDsluCounter, 225 mSDsCounter, 0 mSdLazyCounter, 129 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 255 SdHoareTripleChecker+Invalid, 129 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 129 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:45:57,035 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 255 Invalid, 129 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 129 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:45:57,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-11-21 00:45:57,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2021-11-21 00:45:57,044 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 66 states have (on average 1.0757575757575757) internal successors, (71), 66 states have internal predecessors, (71), 11 states have call successors, (11), 11 states have call predecessors, (11), 10 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-11-21 00:45:57,045 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 92 transitions. [2021-11-21 00:45:57,046 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 92 transitions. Word has length 53 [2021-11-21 00:45:57,046 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:45:57,046 INFO L470 AbstractCegarLoop]: Abstraction has 88 states and 92 transitions. [2021-11-21 00:45:57,046 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 2.5) internal successors, (25), 10 states have internal predecessors, (25), 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) [2021-11-21 00:45:57,047 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 92 transitions. [2021-11-21 00:45:57,047 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-21 00:45:57,048 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:45:57,048 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 7, 6, 1, 1, 1, 1, 1] [2021-11-21 00:45:57,062 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-21 00:45:57,252 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:45:57,253 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:45:57,253 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:45:57,253 INFO L85 PathProgramCache]: Analyzing trace with hash -70749367, now seen corresponding path program 6 times [2021-11-21 00:45:57,253 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:45:57,254 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1737581371] [2021-11-21 00:45:57,254 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:45:57,254 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:45:57,260 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 00:45:57,261 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1590077570] [2021-11-21 00:45:57,261 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:45:57,261 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:45:57,261 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:45:57,265 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:45:57,278 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-21 00:45:57,665 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:45:57,665 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:45:57,666 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-21 00:45:57,668 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:45:57,933 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 14 proven. 84 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2021-11-21 00:45:57,933 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:45:58,121 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:45:58,121 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1737581371] [2021-11-21 00:45:58,121 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 00:45:58,121 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1590077570] [2021-11-21 00:45:58,122 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1590077570] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:45:58,122 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1920144763] [2021-11-21 00:45:58,124 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 00:45:58,124 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:45:58,124 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:45:58,124 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:45:58,125 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:46:20,510 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 21 for LOIs [2021-11-21 00:46:20,586 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:46:21,043 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:46:21,043 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:46:21,043 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2021-11-21 00:46:21,043 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [983822327] [2021-11-21 00:46:21,043 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-21 00:46:21,044 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-21 00:46:21,044 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:46:21,044 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-21 00:46:21,044 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=484, Unknown=0, NotChecked=0, Total=552 [2021-11-21 00:46:21,044 INFO L87 Difference]: Start difference. First operand 88 states and 92 transitions. Second operand has 12 states, 11 states have (on average 2.5454545454545454) internal successors, (28), 11 states have internal predecessors, (28), 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) [2021-11-21 00:46:21,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:46:21,210 INFO L93 Difference]: Finished difference Result 93 states and 96 transitions. [2021-11-21 00:46:21,211 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-21 00:46:21,211 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 2.5454545454545454) internal successors, (28), 11 states have internal predecessors, (28), 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 61 [2021-11-21 00:46:21,211 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:46:21,212 INFO L225 Difference]: With dead ends: 93 [2021-11-21 00:46:21,212 INFO L226 Difference]: Without dead ends: 88 [2021-11-21 00:46:21,213 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 112 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=79, Invalid=571, Unknown=0, NotChecked=0, Total=650 [2021-11-21 00:46:21,213 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 2 mSDsluCounter, 280 mSDsCounter, 0 mSdLazyCounter, 162 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 314 SdHoareTripleChecker+Invalid, 162 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 162 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:46:21,214 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 314 Invalid, 162 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 162 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:46:21,214 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-11-21 00:46:21,222 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2021-11-21 00:46:21,223 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 66 states have (on average 1.0606060606060606) internal successors, (70), 66 states have internal predecessors, (70), 11 states have call successors, (11), 11 states have call predecessors, (11), 10 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-11-21 00:46:21,224 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 91 transitions. [2021-11-21 00:46:21,224 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 91 transitions. Word has length 61 [2021-11-21 00:46:21,224 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:46:21,224 INFO L470 AbstractCegarLoop]: Abstraction has 88 states and 91 transitions. [2021-11-21 00:46:21,225 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 2.5454545454545454) internal successors, (28), 11 states have internal predecessors, (28), 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) [2021-11-21 00:46:21,225 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 91 transitions. [2021-11-21 00:46:21,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-21 00:46:21,226 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:46:21,226 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 8, 8, 8, 7, 1, 1, 1, 1, 1] [2021-11-21 00:46:21,232 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-21 00:46:21,431 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:46:21,431 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:46:21,431 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:46:21,431 INFO L85 PathProgramCache]: Analyzing trace with hash -1169236305, now seen corresponding path program 7 times [2021-11-21 00:46:21,431 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:46:21,432 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2010412707] [2021-11-21 00:46:21,432 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:46:21,432 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:46:21,439 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 00:46:21,439 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [111260319] [2021-11-21 00:46:21,440 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:46:21,440 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:46:21,440 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:46:21,446 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:46:21,452 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-21 00:46:21,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:46:21,986 INFO L263 TraceCheckSpWp]: Trace formula consists of 206 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-21 00:46:21,989 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:46:22,334 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 16 proven. 112 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2021-11-21 00:46:22,334 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:46:22,479 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:46:22,479 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2010412707] [2021-11-21 00:46:22,479 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 00:46:22,479 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [111260319] [2021-11-21 00:46:22,479 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [111260319] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:46:22,479 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1317037928] [2021-11-21 00:46:22,481 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 00:46:22,481 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:46:22,481 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:46:22,481 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:46:22,481 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:46:42,654 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 21 for LOIs [2021-11-21 00:46:42,729 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:46:43,195 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:46:43,196 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:46:43,196 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2021-11-21 00:46:43,196 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2057856556] [2021-11-21 00:46:43,196 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-21 00:46:43,196 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-21 00:46:43,196 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:46:43,197 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-21 00:46:43,197 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=529, Unknown=0, NotChecked=0, Total=600 [2021-11-21 00:46:43,197 INFO L87 Difference]: Start difference. First operand 88 states and 91 transitions. Second operand has 13 states, 12 states have (on average 2.5833333333333335) internal successors, (31), 12 states have internal predecessors, (31), 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) [2021-11-21 00:46:43,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:46:43,400 INFO L93 Difference]: Finished difference Result 93 states and 95 transitions. [2021-11-21 00:46:43,401 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-21 00:46:43,401 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 2.5833333333333335) internal successors, (31), 12 states have internal predecessors, (31), 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 69 [2021-11-21 00:46:43,401 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:46:43,402 INFO L225 Difference]: With dead ends: 93 [2021-11-21 00:46:43,402 INFO L226 Difference]: Without dead ends: 88 [2021-11-21 00:46:43,403 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 127 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=82, Invalid=620, Unknown=0, NotChecked=0, Total=702 [2021-11-21 00:46:43,404 INFO L933 BasicCegarLoop]: 40 mSDtfsCounter, 2 mSDsluCounter, 341 mSDsCounter, 0 mSdLazyCounter, 199 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 379 SdHoareTripleChecker+Invalid, 199 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 199 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:46:43,404 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 379 Invalid, 199 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 199 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:46:43,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-11-21 00:46:43,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2021-11-21 00:46:43,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 66 states have (on average 1.0454545454545454) internal successors, (69), 66 states have internal predecessors, (69), 11 states have call successors, (11), 11 states have call predecessors, (11), 10 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-11-21 00:46:43,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 90 transitions. [2021-11-21 00:46:43,414 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 90 transitions. Word has length 69 [2021-11-21 00:46:43,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:46:43,415 INFO L470 AbstractCegarLoop]: Abstraction has 88 states and 90 transitions. [2021-11-21 00:46:43,415 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 2.5833333333333335) internal successors, (31), 12 states have internal predecessors, (31), 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) [2021-11-21 00:46:43,415 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 90 transitions. [2021-11-21 00:46:43,416 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-11-21 00:46:43,416 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:46:43,417 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 9, 9, 9, 8, 1, 1, 1, 1, 1] [2021-11-21 00:46:43,424 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-21 00:46:43,625 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-21 00:46:43,625 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:46:43,626 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:46:43,626 INFO L85 PathProgramCache]: Analyzing trace with hash 1082033173, now seen corresponding path program 8 times [2021-11-21 00:46:43,626 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:46:43,626 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [307836439] [2021-11-21 00:46:43,626 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:46:43,626 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:46:43,631 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 00:46:43,632 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [402457271] [2021-11-21 00:46:43,632 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:46:43,632 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:46:43,632 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:46:43,638 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:46:43,639 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-21 00:46:44,139 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2021-11-21 00:46:44,139 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:46:44,141 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 51 conjunts are in the unsatisfiable core [2021-11-21 00:46:44,143 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:46:44,640 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 58 proven. 146 refuted. 0 times theorem prover too weak. 102 trivial. 0 not checked. [2021-11-21 00:46:44,641 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:46:58,416 WARN L838 $PredicateComparison]: unable to prove that (or (not (= (mod (+ (* (- 1) |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1|) (* (- 1) |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1|) (* (- 2) |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1|)) (- 4)) 0)) (forall ((|ULTIMATE.start_main_~k~0#1| Int)) (or (= (+ |ULTIMATE.start_main_~k~0#1| (* |c_ULTIMATE.start_main_~y~0#1| |ULTIMATE.start_main_~k~0#1|)) (+ (* 2 |c_ULTIMATE.start_main_~y~0#1|) (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1|) 1)) (<= |ULTIMATE.start_main_~k~0#1| |c_ULTIMATE.start_main_~c~0#1|) (< (+ |c_ULTIMATE.start_main_~c~0#1| 1) |ULTIMATE.start_main_~k~0#1|)))) is different from false [2021-11-21 00:46:58,418 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:46:58,418 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [307836439] [2021-11-21 00:46:58,419 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 00:46:58,419 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [402457271] [2021-11-21 00:46:58,419 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [402457271] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:46:58,419 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [78806272] [2021-11-21 00:46:58,420 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 00:46:58,420 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:46:58,421 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:46:58,421 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:46:58,421 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:47:09,167 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 21 for LOIs [2021-11-21 00:47:09,247 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:47:09,771 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:47:09,771 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:47:09,771 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2021-11-21 00:47:09,771 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1271140259] [2021-11-21 00:47:09,771 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-21 00:47:09,772 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-21 00:47:09,772 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:47:09,772 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-21 00:47:09,773 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=886, Unknown=1, NotChecked=60, Total=1056 [2021-11-21 00:47:09,773 INFO L87 Difference]: Start difference. First operand 88 states and 90 transitions. Second operand has 18 states, 17 states have (on average 2.176470588235294) internal successors, (37), 15 states have internal predecessors, (37), 10 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-11-21 00:47:10,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:47:10,092 INFO L93 Difference]: Finished difference Result 93 states and 94 transitions. [2021-11-21 00:47:10,092 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-21 00:47:10,093 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 2.176470588235294) internal successors, (37), 15 states have internal predecessors, (37), 10 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) Word has length 77 [2021-11-21 00:47:10,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:47:10,094 INFO L225 Difference]: With dead ends: 93 [2021-11-21 00:47:10,094 INFO L226 Difference]: Without dead ends: 88 [2021-11-21 00:47:10,094 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 135 SyntacticMatches, 1 SemanticMatches, 34 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 148 ImplicationChecksByTransitivity, 10.3s TimeCoverageRelationStatistics Valid=132, Invalid=1061, Unknown=1, NotChecked=66, Total=1260 [2021-11-21 00:47:10,095 INFO L933 BasicCegarLoop]: 32 mSDtfsCounter, 8 mSDsluCounter, 459 mSDsCounter, 0 mSdLazyCounter, 413 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 487 SdHoareTripleChecker+Invalid, 415 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 413 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:47:10,095 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 487 Invalid, 415 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 413 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 00:47:10,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-11-21 00:47:10,102 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2021-11-21 00:47:10,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 66 states have (on average 1.0303030303030303) internal successors, (68), 66 states have internal predecessors, (68), 11 states have call successors, (11), 11 states have call predecessors, (11), 10 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-11-21 00:47:10,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 89 transitions. [2021-11-21 00:47:10,104 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 89 transitions. Word has length 77 [2021-11-21 00:47:10,104 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:47:10,105 INFO L470 AbstractCegarLoop]: Abstraction has 88 states and 89 transitions. [2021-11-21 00:47:10,105 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 2.176470588235294) internal successors, (37), 15 states have internal predecessors, (37), 10 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-11-21 00:47:10,105 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 89 transitions. [2021-11-21 00:47:10,106 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-11-21 00:47:10,106 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:47:10,107 INFO L514 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 10, 10, 10, 9, 1, 1, 1, 1, 1] [2021-11-21 00:47:10,114 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-21 00:47:10,310 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-21 00:47:10,311 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:47:10,311 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:47:10,311 INFO L85 PathProgramCache]: Analyzing trace with hash 1451058043, now seen corresponding path program 9 times [2021-11-21 00:47:10,311 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:47:10,311 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [993663942] [2021-11-21 00:47:10,311 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:47:10,311 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:47:10,317 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 00:47:10,317 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [439683379] [2021-11-21 00:47:10,317 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:47:10,318 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:47:10,318 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:47:10,319 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:47:10,319 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-21 00:47:11,268 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:47:11,268 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:47:11,270 INFO L263 TraceCheckSpWp]: Trace formula consists of 248 conjuncts, 44 conjunts are in the unsatisfiable core [2021-11-21 00:47:11,272 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:47:11,664 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 20 proven. 180 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2021-11-21 00:47:11,665 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:47:11,810 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:47:11,810 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [993663942] [2021-11-21 00:47:11,810 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 00:47:11,810 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [439683379] [2021-11-21 00:47:11,810 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [439683379] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:47:11,811 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [892050381] [2021-11-21 00:47:11,812 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 00:47:11,812 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:47:11,813 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:47:11,813 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:47:11,813 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:47:26,414 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 21 for LOIs [2021-11-21 00:47:26,491 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:47:26,974 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:47:26,974 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:47:26,974 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2021-11-21 00:47:26,974 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [794091844] [2021-11-21 00:47:26,974 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-21 00:47:26,975 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-21 00:47:26,975 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:47:26,976 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-21 00:47:26,976 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=625, Unknown=0, NotChecked=0, Total=702 [2021-11-21 00:47:26,976 INFO L87 Difference]: Start difference. First operand 88 states and 89 transitions. Second operand has 15 states, 14 states have (on average 2.642857142857143) internal successors, (37), 14 states have internal predecessors, (37), 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) [2021-11-21 00:47:27,235 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:47:27,236 INFO L93 Difference]: Finished difference Result 95 states and 97 transitions. [2021-11-21 00:47:27,236 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-21 00:47:27,236 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 2.642857142857143) internal successors, (37), 14 states have internal predecessors, (37), 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 85 [2021-11-21 00:47:27,236 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:47:27,237 INFO L225 Difference]: With dead ends: 95 [2021-11-21 00:47:27,237 INFO L226 Difference]: Without dead ends: 90 [2021-11-21 00:47:27,238 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 185 GetRequests, 157 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=88, Invalid=724, Unknown=0, NotChecked=0, Total=812 [2021-11-21 00:47:27,238 INFO L933 BasicCegarLoop]: 48 mSDtfsCounter, 2 mSDsluCounter, 481 mSDsCounter, 0 mSdLazyCounter, 285 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 527 SdHoareTripleChecker+Invalid, 285 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 285 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:47:27,239 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 527 Invalid, 285 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 285 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:47:27,239 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2021-11-21 00:47:27,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 90. [2021-11-21 00:47:27,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 67 states have (on average 1.0298507462686568) internal successors, (69), 67 states have internal predecessors, (69), 12 states have call successors, (12), 11 states have call predecessors, (12), 10 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-11-21 00:47:27,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 92 transitions. [2021-11-21 00:47:27,246 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 92 transitions. Word has length 85 [2021-11-21 00:47:27,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:47:27,247 INFO L470 AbstractCegarLoop]: Abstraction has 90 states and 92 transitions. [2021-11-21 00:47:27,247 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 2.642857142857143) internal successors, (37), 14 states have internal predecessors, (37), 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) [2021-11-21 00:47:27,247 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 92 transitions. [2021-11-21 00:47:27,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-11-21 00:47:27,249 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:47:27,249 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1] [2021-11-21 00:47:27,257 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2021-11-21 00:47:27,454 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:47:27,454 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:47:27,455 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:47:27,455 INFO L85 PathProgramCache]: Analyzing trace with hash -612304928, now seen corresponding path program 3 times [2021-11-21 00:47:27,455 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:47:27,455 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1601369902] [2021-11-21 00:47:27,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:47:27,455 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:47:27,463 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 00:47:27,463 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [153991714] [2021-11-21 00:47:27,463 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:47:27,464 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:47:27,464 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:47:27,465 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:47:27,469 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-21 00:47:28,240 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:47:28,240 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:47:28,241 INFO L263 TraceCheckSpWp]: Trace formula consists of 259 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-21 00:47:28,243 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:47:28,462 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 20 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:47:28,462 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:47:28,762 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 20 proven. 200 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2021-11-21 00:47:28,763 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:47:28,763 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1601369902] [2021-11-21 00:47:28,763 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 00:47:28,763 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [153991714] [2021-11-21 00:47:28,763 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [153991714] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:47:28,763 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1590563650] [2021-11-21 00:47:28,764 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 00:47:28,765 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:47:28,765 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:47:28,765 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:47:28,765 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:47:42,984 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 21 for LOIs [2021-11-21 00:47:43,067 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:47:43,415 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:47:43,415 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 00:47:43,415 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14] total 24 [2021-11-21 00:47:43,415 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1886589666] [2021-11-21 00:47:43,415 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 00:47:43,416 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-21 00:47:43,416 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:47:43,417 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-21 00:47:43,417 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=259, Invalid=733, Unknown=0, NotChecked=0, Total=992 [2021-11-21 00:47:43,417 INFO L87 Difference]: Start difference. First operand 90 states and 92 transitions. Second operand has 24 states, 24 states have (on average 4.125) internal successors, (99), 24 states have internal predecessors, (99), 20 states have call successors, (21), 12 states have call predecessors, (21), 11 states have return successors, (20), 19 states have call predecessors, (20), 19 states have call successors, (20) [2021-11-21 00:47:43,894 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:47:43,894 INFO L93 Difference]: Finished difference Result 218 states and 228 transitions. [2021-11-21 00:47:43,895 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-11-21 00:47:43,895 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 4.125) internal successors, (99), 24 states have internal predecessors, (99), 20 states have call successors, (21), 12 states have call predecessors, (21), 11 states have return successors, (20), 19 states have call predecessors, (20), 19 states have call successors, (20) Word has length 87 [2021-11-21 00:47:43,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:47:43,897 INFO L225 Difference]: With dead ends: 218 [2021-11-21 00:47:43,897 INFO L226 Difference]: Without dead ends: 213 [2021-11-21 00:47:43,899 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 278 GetRequests, 228 SyntacticMatches, 1 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 528 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=688, Invalid=1862, Unknown=0, NotChecked=0, Total=2550 [2021-11-21 00:47:43,899 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 150 mSDsluCounter, 159 mSDsCounter, 0 mSdLazyCounter, 132 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 150 SdHoareTripleChecker+Valid, 189 SdHoareTripleChecker+Invalid, 161 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 132 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:47:43,900 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [150 Valid, 189 Invalid, 161 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 132 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:47:43,900 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 213 states. [2021-11-21 00:47:43,910 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 213 to 168. [2021-11-21 00:47:43,911 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 168 states, 126 states have (on average 1.0873015873015872) internal successors, (137), 126 states have internal predecessors, (137), 21 states have call successors, (21), 21 states have call predecessors, (21), 20 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2021-11-21 00:47:43,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 178 transitions. [2021-11-21 00:47:43,913 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 178 transitions. Word has length 87 [2021-11-21 00:47:43,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:47:43,914 INFO L470 AbstractCegarLoop]: Abstraction has 168 states and 178 transitions. [2021-11-21 00:47:43,914 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 4.125) internal successors, (99), 24 states have internal predecessors, (99), 20 states have call successors, (21), 12 states have call predecessors, (21), 11 states have return successors, (20), 19 states have call predecessors, (20), 19 states have call successors, (20) [2021-11-21 00:47:43,914 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 178 transitions. [2021-11-21 00:47:43,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-11-21 00:47:43,915 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:47:43,916 INFO L514 BasicCegarLoop]: trace histogram [12, 11, 11, 11, 11, 11, 11, 10, 1, 1, 1, 1, 1] [2021-11-21 00:47:43,934 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-21 00:47:44,121 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-21 00:47:44,121 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:47:44,121 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:47:44,121 INFO L85 PathProgramCache]: Analyzing trace with hash 1047624929, now seen corresponding path program 10 times [2021-11-21 00:47:44,122 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:47:44,122 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [293026309] [2021-11-21 00:47:44,122 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:47:44,122 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:47:44,127 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 00:47:44,127 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1063863716] [2021-11-21 00:47:44,127 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:47:44,128 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:47:44,128 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:47:44,129 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:47:44,134 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-21 00:47:45,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:47:45,330 INFO L263 TraceCheckSpWp]: Trace formula consists of 269 conjuncts, 49 conjunts are in the unsatisfiable core [2021-11-21 00:47:45,332 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:47:45,848 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 22 proven. 220 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2021-11-21 00:47:45,848 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:47:46,739 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:47:46,740 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [293026309] [2021-11-21 00:47:46,740 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 00:47:46,740 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1063863716] [2021-11-21 00:47:46,740 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1063863716] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:47:46,740 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2085862581] [2021-11-21 00:47:46,742 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 00:47:46,742 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:47:46,743 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:47:46,743 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:47:46,743 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:48:07,304 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 21 for LOIs [2021-11-21 00:48:07,380 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:48:08,012 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:48:08,012 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:48:08,012 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2021-11-21 00:48:08,013 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1253637074] [2021-11-21 00:48:08,013 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-21 00:48:08,013 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-21 00:48:08,013 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:48:08,014 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-21 00:48:08,014 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=198, Invalid=1134, Unknown=0, NotChecked=0, Total=1332 [2021-11-21 00:48:08,014 INFO L87 Difference]: Start difference. First operand 168 states and 178 transitions. Second operand has 16 states, 15 states have (on average 2.6666666666666665) internal successors, (40), 15 states have internal predecessors, (40), 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) [2021-11-21 00:48:08,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:48:08,281 INFO L93 Difference]: Finished difference Result 173 states and 182 transitions. [2021-11-21 00:48:08,281 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-21 00:48:08,281 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 2.6666666666666665) internal successors, (40), 15 states have internal predecessors, (40), 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 93 [2021-11-21 00:48:08,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:48:08,282 INFO L225 Difference]: With dead ends: 173 [2021-11-21 00:48:08,282 INFO L226 Difference]: Without dead ends: 168 [2021-11-21 00:48:08,283 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 273 GetRequests, 235 SyntacticMatches, 1 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 152 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=209, Invalid=1273, Unknown=0, NotChecked=0, Total=1482 [2021-11-21 00:48:08,284 INFO L933 BasicCegarLoop]: 52 mSDtfsCounter, 2 mSDsluCounter, 560 mSDsCounter, 0 mSdLazyCounter, 334 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 610 SdHoareTripleChecker+Invalid, 334 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 334 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:48:08,284 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 610 Invalid, 334 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 334 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:48:08,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2021-11-21 00:48:08,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 168. [2021-11-21 00:48:08,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 168 states, 126 states have (on average 1.0793650793650793) internal successors, (136), 126 states have internal predecessors, (136), 21 states have call successors, (21), 21 states have call predecessors, (21), 20 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2021-11-21 00:48:08,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 177 transitions. [2021-11-21 00:48:08,295 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 177 transitions. Word has length 93 [2021-11-21 00:48:08,295 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:48:08,296 INFO L470 AbstractCegarLoop]: Abstraction has 168 states and 177 transitions. [2021-11-21 00:48:08,296 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 2.6666666666666665) internal successors, (40), 15 states have internal predecessors, (40), 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) [2021-11-21 00:48:08,296 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 177 transitions. [2021-11-21 00:48:08,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-11-21 00:48:08,297 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:48:08,297 INFO L514 BasicCegarLoop]: trace histogram [13, 12, 12, 12, 12, 12, 12, 11, 1, 1, 1, 1, 1] [2021-11-21 00:48:08,326 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2021-11-21 00:48:08,502 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-21 00:48:08,502 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:48:08,502 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:48:08,502 INFO L85 PathProgramCache]: Analyzing trace with hash -1266626489, now seen corresponding path program 11 times [2021-11-21 00:48:08,502 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:48:08,502 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [146695347] [2021-11-21 00:48:08,503 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:48:08,503 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:48:08,508 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 00:48:08,508 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1828307079] [2021-11-21 00:48:08,509 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:48:08,509 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:48:08,509 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:48:08,511 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:48:08,523 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-21 00:48:09,025 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2021-11-21 00:48:09,025 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:48:09,028 INFO L263 TraceCheckSpWp]: Trace formula consists of 290 conjuncts, 53 conjunts are in the unsatisfiable core [2021-11-21 00:48:09,029 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:48:09,600 INFO L134 CoverageAnalysis]: Checked inductivity of 552 backedges. 24 proven. 264 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2021-11-21 00:48:09,601 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:48:10,828 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:48:10,828 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [146695347] [2021-11-21 00:48:10,828 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 00:48:10,828 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1828307079] [2021-11-21 00:48:10,828 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1828307079] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:48:10,828 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1690821946] [2021-11-21 00:48:10,830 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 00:48:10,830 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:48:10,830 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:48:10,831 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:48:10,831 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:48:28,730 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 21 for LOIs [2021-11-21 00:48:28,804 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:48:29,421 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:48:29,421 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:48:29,421 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2021-11-21 00:48:29,421 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [161259696] [2021-11-21 00:48:29,422 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-21 00:48:29,423 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-21 00:48:29,424 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:48:29,424 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-21 00:48:29,424 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=224, Invalid=1258, Unknown=0, NotChecked=0, Total=1482 [2021-11-21 00:48:29,425 INFO L87 Difference]: Start difference. First operand 168 states and 177 transitions. Second operand has 17 states, 16 states have (on average 2.6875) internal successors, (43), 16 states have internal predecessors, (43), 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) [2021-11-21 00:48:29,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:48:29,751 INFO L93 Difference]: Finished difference Result 173 states and 181 transitions. [2021-11-21 00:48:29,752 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-21 00:48:29,752 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 2.6875) internal successors, (43), 16 states have internal predecessors, (43), 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 101 [2021-11-21 00:48:29,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:48:29,753 INFO L225 Difference]: With dead ends: 173 [2021-11-21 00:48:29,754 INFO L226 Difference]: Without dead ends: 168 [2021-11-21 00:48:29,754 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 297 GetRequests, 257 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 163 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=235, Invalid=1405, Unknown=0, NotChecked=0, Total=1640 [2021-11-21 00:48:29,755 INFO L933 BasicCegarLoop]: 56 mSDtfsCounter, 2 mSDsluCounter, 645 mSDsCounter, 0 mSdLazyCounter, 387 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 699 SdHoareTripleChecker+Invalid, 387 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 387 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:48:29,755 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 699 Invalid, 387 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 387 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 00:48:29,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2021-11-21 00:48:29,766 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 168. [2021-11-21 00:48:29,767 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 168 states, 126 states have (on average 1.0714285714285714) internal successors, (135), 126 states have internal predecessors, (135), 21 states have call successors, (21), 21 states have call predecessors, (21), 20 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2021-11-21 00:48:29,768 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 176 transitions. [2021-11-21 00:48:29,768 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 176 transitions. Word has length 101 [2021-11-21 00:48:29,768 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:48:29,768 INFO L470 AbstractCegarLoop]: Abstraction has 168 states and 176 transitions. [2021-11-21 00:48:29,769 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 2.6875) internal successors, (43), 16 states have internal predecessors, (43), 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) [2021-11-21 00:48:29,769 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 176 transitions. [2021-11-21 00:48:29,770 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2021-11-21 00:48:29,770 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:48:29,770 INFO L514 BasicCegarLoop]: trace histogram [14, 13, 13, 13, 13, 13, 13, 12, 1, 1, 1, 1, 1] [2021-11-21 00:48:29,780 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-21 00:48:29,975 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-21 00:48:29,976 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:48:29,977 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:48:29,977 INFO L85 PathProgramCache]: Analyzing trace with hash -288268883, now seen corresponding path program 12 times [2021-11-21 00:48:29,977 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:48:29,977 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [768234406] [2021-11-21 00:48:29,977 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:48:29,977 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:48:29,983 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 00:48:29,983 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [743557911] [2021-11-21 00:48:29,983 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:48:29,983 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:48:29,984 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:48:29,985 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:48:29,987 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-21 00:48:30,702 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:48:30,702 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:48:30,705 INFO L263 TraceCheckSpWp]: Trace formula consists of 311 conjuncts, 56 conjunts are in the unsatisfiable core [2021-11-21 00:48:30,707 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:48:31,173 INFO L134 CoverageAnalysis]: Checked inductivity of 650 backedges. 26 proven. 312 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2021-11-21 00:48:31,174 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:48:31,390 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:48:31,390 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [768234406] [2021-11-21 00:48:31,390 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 00:48:31,390 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [743557911] [2021-11-21 00:48:31,390 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [743557911] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:48:31,391 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [581601010] [2021-11-21 00:48:31,392 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 00:48:31,392 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:48:31,393 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:48:31,393 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:48:31,393 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:48:52,237 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 21 for LOIs [2021-11-21 00:48:52,314 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:48:52,843 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:48:52,843 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:48:52,843 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2021-11-21 00:48:52,844 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [727061790] [2021-11-21 00:48:52,844 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-21 00:48:52,844 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-21 00:48:52,844 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:48:52,844 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-21 00:48:52,845 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=784, Unknown=0, NotChecked=0, Total=870 [2021-11-21 00:48:52,845 INFO L87 Difference]: Start difference. First operand 168 states and 176 transitions. Second operand has 18 states, 17 states have (on average 2.7058823529411766) internal successors, (46), 17 states have internal predecessors, (46), 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) [2021-11-21 00:48:53,242 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:48:53,242 INFO L93 Difference]: Finished difference Result 173 states and 180 transitions. [2021-11-21 00:48:53,243 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-21 00:48:53,243 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 2.7058823529411766) internal successors, (46), 17 states have internal predecessors, (46), 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 109 [2021-11-21 00:48:53,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:48:53,245 INFO L225 Difference]: With dead ends: 173 [2021-11-21 00:48:53,245 INFO L226 Difference]: Without dead ends: 168 [2021-11-21 00:48:53,245 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 233 GetRequests, 202 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=97, Invalid=895, Unknown=0, NotChecked=0, Total=992 [2021-11-21 00:48:53,246 INFO L933 BasicCegarLoop]: 60 mSDtfsCounter, 2 mSDsluCounter, 736 mSDsCounter, 0 mSdLazyCounter, 444 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 794 SdHoareTripleChecker+Invalid, 444 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 444 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:48:53,246 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 794 Invalid, 444 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 444 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 00:48:53,247 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2021-11-21 00:48:53,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 168. [2021-11-21 00:48:53,260 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 168 states, 126 states have (on average 1.0634920634920635) internal successors, (134), 126 states have internal predecessors, (134), 21 states have call successors, (21), 21 states have call predecessors, (21), 20 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2021-11-21 00:48:53,261 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 175 transitions. [2021-11-21 00:48:53,262 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 175 transitions. Word has length 109 [2021-11-21 00:48:53,262 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:48:53,262 INFO L470 AbstractCegarLoop]: Abstraction has 168 states and 175 transitions. [2021-11-21 00:48:53,262 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 2.7058823529411766) internal successors, (46), 17 states have internal predecessors, (46), 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) [2021-11-21 00:48:53,263 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 175 transitions. [2021-11-21 00:48:53,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2021-11-21 00:48:53,265 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:48:53,265 INFO L514 BasicCegarLoop]: trace histogram [15, 14, 14, 14, 14, 14, 14, 13, 1, 1, 1, 1, 1] [2021-11-21 00:48:53,277 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-21 00:48:53,473 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:48:53,474 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:48:53,474 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:48:53,474 INFO L85 PathProgramCache]: Analyzing trace with hash -1651956461, now seen corresponding path program 13 times [2021-11-21 00:48:53,474 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:48:53,474 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [518932368] [2021-11-21 00:48:53,474 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:48:53,474 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:48:53,480 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 00:48:53,480 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [68485479] [2021-11-21 00:48:53,480 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:48:53,480 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:48:53,480 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:48:53,481 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:48:53,486 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-21 00:48:54,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:48:54,138 INFO L263 TraceCheckSpWp]: Trace formula consists of 332 conjuncts, 60 conjunts are in the unsatisfiable core [2021-11-21 00:48:54,140 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:48:54,629 INFO L134 CoverageAnalysis]: Checked inductivity of 756 backedges. 28 proven. 364 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2021-11-21 00:48:54,629 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:48:54,849 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:48:54,850 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [518932368] [2021-11-21 00:48:54,850 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 00:48:54,850 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [68485479] [2021-11-21 00:48:54,850 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [68485479] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:48:54,850 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [404480381] [2021-11-21 00:48:54,851 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 00:48:54,852 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:48:54,852 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:48:54,852 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:48:54,852 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:49:13,126 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 21 for LOIs [2021-11-21 00:49:13,211 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:49:13,743 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:49:13,743 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:49:13,743 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2021-11-21 00:49:13,743 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [462198785] [2021-11-21 00:49:13,743 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-21 00:49:13,744 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-21 00:49:13,744 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:49:13,744 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-21 00:49:13,744 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=841, Unknown=0, NotChecked=0, Total=930 [2021-11-21 00:49:13,745 INFO L87 Difference]: Start difference. First operand 168 states and 175 transitions. Second operand has 19 states, 18 states have (on average 2.7222222222222223) internal successors, (49), 18 states have internal predecessors, (49), 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) [2021-11-21 00:49:14,089 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:49:14,090 INFO L93 Difference]: Finished difference Result 173 states and 179 transitions. [2021-11-21 00:49:14,090 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-21 00:49:14,090 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 2.7222222222222223) internal successors, (49), 18 states have internal predecessors, (49), 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 117 [2021-11-21 00:49:14,091 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:49:14,092 INFO L225 Difference]: With dead ends: 173 [2021-11-21 00:49:14,092 INFO L226 Difference]: Without dead ends: 168 [2021-11-21 00:49:14,092 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 249 GetRequests, 217 SyntacticMatches, 1 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=100, Invalid=956, Unknown=0, NotChecked=0, Total=1056 [2021-11-21 00:49:14,093 INFO L933 BasicCegarLoop]: 64 mSDtfsCounter, 2 mSDsluCounter, 833 mSDsCounter, 0 mSdLazyCounter, 505 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 895 SdHoareTripleChecker+Invalid, 505 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 505 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:49:14,093 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 895 Invalid, 505 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 505 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 00:49:14,094 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2021-11-21 00:49:14,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 168. [2021-11-21 00:49:14,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 168 states, 126 states have (on average 1.0555555555555556) internal successors, (133), 126 states have internal predecessors, (133), 21 states have call successors, (21), 21 states have call predecessors, (21), 20 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2021-11-21 00:49:14,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 174 transitions. [2021-11-21 00:49:14,105 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 174 transitions. Word has length 117 [2021-11-21 00:49:14,106 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:49:14,106 INFO L470 AbstractCegarLoop]: Abstraction has 168 states and 174 transitions. [2021-11-21 00:49:14,106 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 18 states have (on average 2.7222222222222223) internal successors, (49), 18 states have internal predecessors, (49), 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) [2021-11-21 00:49:14,106 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 174 transitions. [2021-11-21 00:49:14,107 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2021-11-21 00:49:14,107 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:49:14,107 INFO L514 BasicCegarLoop]: trace histogram [16, 15, 15, 15, 15, 15, 15, 14, 1, 1, 1, 1, 1] [2021-11-21 00:49:14,114 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-21 00:49:14,307 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:49:14,308 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:49:14,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:49:14,308 INFO L85 PathProgramCache]: Analyzing trace with hash -355588487, now seen corresponding path program 14 times [2021-11-21 00:49:14,308 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:49:14,308 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [499066932] [2021-11-21 00:49:14,308 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:49:14,308 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:49:14,315 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 00:49:14,315 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1425856469] [2021-11-21 00:49:14,316 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:49:14,316 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:49:14,316 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:49:14,317 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:49:14,327 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-21 00:49:14,846 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2021-11-21 00:49:14,846 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:49:14,848 INFO L263 TraceCheckSpWp]: Trace formula consists of 353 conjuncts, 64 conjunts are in the unsatisfiable core [2021-11-21 00:49:14,851 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:49:15,410 INFO L134 CoverageAnalysis]: Checked inductivity of 870 backedges. 30 proven. 420 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2021-11-21 00:49:15,410 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:49:15,607 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:49:15,607 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [499066932] [2021-11-21 00:49:15,607 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 00:49:15,607 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1425856469] [2021-11-21 00:49:15,607 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1425856469] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:49:15,608 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1511799394] [2021-11-21 00:49:15,609 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 00:49:15,609 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:49:15,609 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:49:15,610 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:49:15,610 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:49:22,077 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 21 for LOIs [2021-11-21 00:49:22,154 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:49:22,761 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:49:22,761 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:49:22,761 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2021-11-21 00:49:22,761 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [853799573] [2021-11-21 00:49:22,761 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-21 00:49:22,762 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-21 00:49:22,762 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:49:22,762 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-21 00:49:22,763 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=900, Unknown=0, NotChecked=0, Total=992 [2021-11-21 00:49:22,763 INFO L87 Difference]: Start difference. First operand 168 states and 174 transitions. Second operand has 20 states, 19 states have (on average 2.736842105263158) internal successors, (52), 19 states have internal predecessors, (52), 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) [2021-11-21 00:49:23,156 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:49:23,156 INFO L93 Difference]: Finished difference Result 173 states and 178 transitions. [2021-11-21 00:49:23,157 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-21 00:49:23,157 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 2.736842105263158) internal successors, (52), 19 states have internal predecessors, (52), 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 125 [2021-11-21 00:49:23,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:49:23,158 INFO L225 Difference]: With dead ends: 173 [2021-11-21 00:49:23,158 INFO L226 Difference]: Without dead ends: 168 [2021-11-21 00:49:23,159 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 265 GetRequests, 232 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=103, Invalid=1019, Unknown=0, NotChecked=0, Total=1122 [2021-11-21 00:49:23,159 INFO L933 BasicCegarLoop]: 68 mSDtfsCounter, 2 mSDsluCounter, 936 mSDsCounter, 0 mSdLazyCounter, 570 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 1002 SdHoareTripleChecker+Invalid, 570 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 570 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:49:23,160 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 1002 Invalid, 570 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 570 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 00:49:23,160 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2021-11-21 00:49:23,170 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 168. [2021-11-21 00:49:23,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 168 states, 126 states have (on average 1.0476190476190477) internal successors, (132), 126 states have internal predecessors, (132), 21 states have call successors, (21), 21 states have call predecessors, (21), 20 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2021-11-21 00:49:23,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 173 transitions. [2021-11-21 00:49:23,172 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 173 transitions. Word has length 125 [2021-11-21 00:49:23,172 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:49:23,173 INFO L470 AbstractCegarLoop]: Abstraction has 168 states and 173 transitions. [2021-11-21 00:49:23,173 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 2.736842105263158) internal successors, (52), 19 states have internal predecessors, (52), 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) [2021-11-21 00:49:23,173 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 173 transitions. [2021-11-21 00:49:23,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2021-11-21 00:49:23,174 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:49:23,174 INFO L514 BasicCegarLoop]: trace histogram [17, 16, 16, 16, 16, 16, 16, 15, 1, 1, 1, 1, 1] [2021-11-21 00:49:23,184 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2021-11-21 00:49:23,380 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-11-21 00:49:23,381 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:49:23,381 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:49:23,381 INFO L85 PathProgramCache]: Analyzing trace with hash 2059821535, now seen corresponding path program 15 times [2021-11-21 00:49:23,381 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:49:23,381 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1527414775] [2021-11-21 00:49:23,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:49:23,381 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:49:23,388 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 00:49:23,388 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1730229962] [2021-11-21 00:49:23,388 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:49:23,388 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:49:23,388 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:49:23,389 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:49:23,390 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-21 00:49:24,880 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:49:24,880 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:49:24,883 INFO L263 TraceCheckSpWp]: Trace formula consists of 374 conjuncts, 68 conjunts are in the unsatisfiable core [2021-11-21 00:49:24,885 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:49:25,450 INFO L134 CoverageAnalysis]: Checked inductivity of 992 backedges. 32 proven. 480 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2021-11-21 00:49:25,450 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:49:25,630 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:49:25,630 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1527414775] [2021-11-21 00:49:25,630 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 00:49:25,630 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1730229962] [2021-11-21 00:49:25,630 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1730229962] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:49:25,630 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [330227415] [2021-11-21 00:49:25,632 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 00:49:25,632 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:49:25,632 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:49:25,632 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:49:25,633 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:49:41,894 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 21 for LOIs [2021-11-21 00:49:41,969 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:49:42,563 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:49:42,563 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:49:42,563 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2021-11-21 00:49:42,563 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [743639043] [2021-11-21 00:49:42,563 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-21 00:49:42,563 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-11-21 00:49:42,564 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:49:42,564 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-11-21 00:49:42,564 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=961, Unknown=0, NotChecked=0, Total=1056 [2021-11-21 00:49:42,564 INFO L87 Difference]: Start difference. First operand 168 states and 173 transitions. Second operand has 21 states, 20 states have (on average 2.75) internal successors, (55), 20 states have internal predecessors, (55), 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) [2021-11-21 00:49:42,997 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:49:42,998 INFO L93 Difference]: Finished difference Result 173 states and 177 transitions. [2021-11-21 00:49:43,005 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-21 00:49:43,005 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 2.75) internal successors, (55), 20 states have internal predecessors, (55), 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 133 [2021-11-21 00:49:43,005 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:49:43,007 INFO L225 Difference]: With dead ends: 173 [2021-11-21 00:49:43,007 INFO L226 Difference]: Without dead ends: 168 [2021-11-21 00:49:43,007 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 281 GetRequests, 247 SyntacticMatches, 1 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=106, Invalid=1084, Unknown=0, NotChecked=0, Total=1190 [2021-11-21 00:49:43,008 INFO L933 BasicCegarLoop]: 72 mSDtfsCounter, 2 mSDsluCounter, 1045 mSDsCounter, 0 mSdLazyCounter, 639 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 1115 SdHoareTripleChecker+Invalid, 639 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 639 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 00:49:43,008 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 1115 Invalid, 639 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 639 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 00:49:43,009 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2021-11-21 00:49:43,019 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 168. [2021-11-21 00:49:43,019 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 168 states, 126 states have (on average 1.0396825396825398) internal successors, (131), 126 states have internal predecessors, (131), 21 states have call successors, (21), 21 states have call predecessors, (21), 20 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2021-11-21 00:49:43,020 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 172 transitions. [2021-11-21 00:49:43,021 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 172 transitions. Word has length 133 [2021-11-21 00:49:43,021 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:49:43,021 INFO L470 AbstractCegarLoop]: Abstraction has 168 states and 172 transitions. [2021-11-21 00:49:43,022 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 20 states have (on average 2.75) internal successors, (55), 20 states have internal predecessors, (55), 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) [2021-11-21 00:49:43,022 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 172 transitions. [2021-11-21 00:49:43,023 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2021-11-21 00:49:43,023 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:49:43,023 INFO L514 BasicCegarLoop]: trace histogram [18, 17, 17, 17, 17, 17, 17, 16, 1, 1, 1, 1, 1] [2021-11-21 00:49:43,037 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-21 00:49:43,228 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:49:43,229 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:49:43,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:49:43,229 INFO L85 PathProgramCache]: Analyzing trace with hash 1805113157, now seen corresponding path program 16 times [2021-11-21 00:49:43,229 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:49:43,229 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1626387488] [2021-11-21 00:49:43,229 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:49:43,230 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:49:43,234 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 00:49:43,235 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [854190466] [2021-11-21 00:49:43,235 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:49:43,235 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:49:43,235 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:49:43,238 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:49:43,239 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-21 00:49:44,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:49:44,256 INFO L263 TraceCheckSpWp]: Trace formula consists of 395 conjuncts, 72 conjunts are in the unsatisfiable core [2021-11-21 00:49:44,258 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:49:44,866 INFO L134 CoverageAnalysis]: Checked inductivity of 1122 backedges. 34 proven. 544 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2021-11-21 00:49:44,867 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:49:45,042 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:49:45,042 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1626387488] [2021-11-21 00:49:45,042 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 00:49:45,043 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [854190466] [2021-11-21 00:49:45,043 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [854190466] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:49:45,043 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [588783273] [2021-11-21 00:49:45,044 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 00:49:45,044 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:49:45,045 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:49:45,045 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:49:45,045 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:49:59,584 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 21 for LOIs [2021-11-21 00:49:59,658 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:50:00,224 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:50:00,224 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:50:00,224 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2021-11-21 00:50:00,225 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1586133363] [2021-11-21 00:50:00,225 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-21 00:50:00,225 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-21 00:50:00,225 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:50:00,226 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-21 00:50:00,226 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=1024, Unknown=0, NotChecked=0, Total=1122 [2021-11-21 00:50:00,227 INFO L87 Difference]: Start difference. First operand 168 states and 172 transitions. Second operand has 22 states, 21 states have (on average 2.761904761904762) internal successors, (58), 21 states have internal predecessors, (58), 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) [2021-11-21 00:50:00,726 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:50:00,726 INFO L93 Difference]: Finished difference Result 173 states and 176 transitions. [2021-11-21 00:50:00,726 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-21 00:50:00,727 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 2.761904761904762) internal successors, (58), 21 states have internal predecessors, (58), 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 141 [2021-11-21 00:50:00,727 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:50:00,728 INFO L225 Difference]: With dead ends: 173 [2021-11-21 00:50:00,728 INFO L226 Difference]: Without dead ends: 168 [2021-11-21 00:50:00,729 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 297 GetRequests, 262 SyntacticMatches, 1 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=109, Invalid=1151, Unknown=0, NotChecked=0, Total=1260 [2021-11-21 00:50:00,729 INFO L933 BasicCegarLoop]: 76 mSDtfsCounter, 2 mSDsluCounter, 1160 mSDsCounter, 0 mSdLazyCounter, 712 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 1234 SdHoareTripleChecker+Invalid, 712 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 712 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 00:50:00,729 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 1234 Invalid, 712 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 712 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 00:50:00,730 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2021-11-21 00:50:00,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 168. [2021-11-21 00:50:00,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 168 states, 126 states have (on average 1.0317460317460319) internal successors, (130), 126 states have internal predecessors, (130), 21 states have call successors, (21), 21 states have call predecessors, (21), 20 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2021-11-21 00:50:00,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 171 transitions. [2021-11-21 00:50:00,745 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 171 transitions. Word has length 141 [2021-11-21 00:50:00,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:50:00,745 INFO L470 AbstractCegarLoop]: Abstraction has 168 states and 171 transitions. [2021-11-21 00:50:00,746 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 21 states have (on average 2.761904761904762) internal successors, (58), 21 states have internal predecessors, (58), 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) [2021-11-21 00:50:00,746 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 171 transitions. [2021-11-21 00:50:00,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2021-11-21 00:50:00,748 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:50:00,748 INFO L514 BasicCegarLoop]: trace histogram [19, 18, 18, 18, 18, 18, 18, 17, 1, 1, 1, 1, 1] [2021-11-21 00:50:00,754 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-21 00:50:00,953 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:50:00,956 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:50:00,956 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:50:00,957 INFO L85 PathProgramCache]: Analyzing trace with hash 1432913579, now seen corresponding path program 17 times [2021-11-21 00:50:00,957 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:50:00,957 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [655467308] [2021-11-21 00:50:00,957 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:50:00,957 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:50:00,965 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 00:50:00,965 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [774698158] [2021-11-21 00:50:00,965 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:50:00,965 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:50:00,966 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:50:00,966 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:50:00,974 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-21 00:50:01,512 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2021-11-21 00:50:01,512 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:50:01,515 INFO L263 TraceCheckSpWp]: Trace formula consists of 416 conjuncts, 77 conjunts are in the unsatisfiable core [2021-11-21 00:50:01,517 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:50:02,376 INFO L134 CoverageAnalysis]: Checked inductivity of 1260 backedges. 36 proven. 612 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2021-11-21 00:50:02,376 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:50:04,183 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:50:04,183 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [655467308] [2021-11-21 00:50:04,183 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 00:50:04,183 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [774698158] [2021-11-21 00:50:04,183 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [774698158] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:50:04,183 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [334331046] [2021-11-21 00:50:04,185 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 00:50:04,185 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:50:04,185 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:50:04,185 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:50:04,185 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:50:18,676 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 21 for LOIs [2021-11-21 00:50:18,749 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:50:19,585 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:50:19,585 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:50:19,585 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2021-11-21 00:50:19,586 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [430405965] [2021-11-21 00:50:19,586 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-21 00:50:19,586 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-21 00:50:19,586 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:50:19,586 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-21 00:50:19,587 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=422, Invalid=2128, Unknown=0, NotChecked=0, Total=2550 [2021-11-21 00:50:19,587 INFO L87 Difference]: Start difference. First operand 168 states and 171 transitions. Second operand has 23 states, 22 states have (on average 2.772727272727273) internal successors, (61), 22 states have internal predecessors, (61), 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) [2021-11-21 00:50:20,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:50:20,239 INFO L93 Difference]: Finished difference Result 173 states and 175 transitions. [2021-11-21 00:50:20,239 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-21 00:50:20,239 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 2.772727272727273) internal successors, (61), 22 states have internal predecessors, (61), 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 149 [2021-11-21 00:50:20,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:50:20,241 INFO L225 Difference]: With dead ends: 173 [2021-11-21 00:50:20,241 INFO L226 Difference]: Without dead ends: 168 [2021-11-21 00:50:20,242 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 441 GetRequests, 389 SyntacticMatches, 1 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 229 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=433, Invalid=2323, Unknown=0, NotChecked=0, Total=2756 [2021-11-21 00:50:20,243 INFO L933 BasicCegarLoop]: 80 mSDtfsCounter, 2 mSDsluCounter, 1281 mSDsCounter, 0 mSdLazyCounter, 789 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 1359 SdHoareTripleChecker+Invalid, 789 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 789 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-21 00:50:20,244 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 1359 Invalid, 789 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 789 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-21 00:50:20,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2021-11-21 00:50:20,251 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 168. [2021-11-21 00:50:20,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 168 states, 126 states have (on average 1.0238095238095237) internal successors, (129), 126 states have internal predecessors, (129), 21 states have call successors, (21), 21 states have call predecessors, (21), 20 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2021-11-21 00:50:20,253 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 170 transitions. [2021-11-21 00:50:20,253 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 170 transitions. Word has length 149 [2021-11-21 00:50:20,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:50:20,254 INFO L470 AbstractCegarLoop]: Abstraction has 168 states and 170 transitions. [2021-11-21 00:50:20,254 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 22 states have (on average 2.772727272727273) internal successors, (61), 22 states have internal predecessors, (61), 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) [2021-11-21 00:50:20,254 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 170 transitions. [2021-11-21 00:50:20,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2021-11-21 00:50:20,255 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:50:20,256 INFO L514 BasicCegarLoop]: trace histogram [20, 19, 19, 19, 19, 19, 19, 18, 1, 1, 1, 1, 1] [2021-11-21 00:50:20,266 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-21 00:50:20,461 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-11-21 00:50:20,461 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:50:20,461 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:50:20,462 INFO L85 PathProgramCache]: Analyzing trace with hash 1247703057, now seen corresponding path program 18 times [2021-11-21 00:50:20,462 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:50:20,462 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1893910804] [2021-11-21 00:50:20,462 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:50:20,462 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:50:20,467 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 00:50:20,467 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1353153127] [2021-11-21 00:50:20,467 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:50:20,467 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:50:20,467 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:50:20,468 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:50:20,478 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-21 00:50:21,858 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:50:21,858 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:50:21,861 INFO L263 TraceCheckSpWp]: Trace formula consists of 437 conjuncts, 80 conjunts are in the unsatisfiable core [2021-11-21 00:50:21,864 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:50:22,559 INFO L134 CoverageAnalysis]: Checked inductivity of 1406 backedges. 38 proven. 684 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2021-11-21 00:50:22,559 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:50:22,801 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:50:22,801 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1893910804] [2021-11-21 00:50:22,801 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 00:50:22,801 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1353153127] [2021-11-21 00:50:22,801 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1353153127] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:50:22,801 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1973001653] [2021-11-21 00:50:22,803 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 00:50:22,803 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:50:22,803 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:50:22,803 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:50:22,803 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:50:37,298 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 21 for LOIs [2021-11-21 00:50:37,374 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:50:38,015 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:50:38,015 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:50:38,016 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2021-11-21 00:50:38,016 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [490237791] [2021-11-21 00:50:38,016 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-21 00:50:38,016 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-21 00:50:38,016 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:50:38,017 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-21 00:50:38,017 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=1156, Unknown=0, NotChecked=0, Total=1260 [2021-11-21 00:50:38,018 INFO L87 Difference]: Start difference. First operand 168 states and 170 transitions. Second operand has 24 states, 23 states have (on average 2.782608695652174) internal successors, (64), 23 states have internal predecessors, (64), 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) [2021-11-21 00:50:38,626 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:50:38,626 INFO L93 Difference]: Finished difference Result 173 states and 174 transitions. [2021-11-21 00:50:38,626 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-21 00:50:38,626 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 2.782608695652174) internal successors, (64), 23 states have internal predecessors, (64), 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 157 [2021-11-21 00:50:38,627 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:50:38,628 INFO L225 Difference]: With dead ends: 173 [2021-11-21 00:50:38,628 INFO L226 Difference]: Without dead ends: 168 [2021-11-21 00:50:38,629 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 329 GetRequests, 292 SyntacticMatches, 1 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=115, Invalid=1291, Unknown=0, NotChecked=0, Total=1406 [2021-11-21 00:50:38,629 INFO L933 BasicCegarLoop]: 84 mSDtfsCounter, 2 mSDsluCounter, 1408 mSDsCounter, 0 mSdLazyCounter, 870 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 1490 SdHoareTripleChecker+Invalid, 870 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 870 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-21 00:50:38,630 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 1490 Invalid, 870 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 870 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-21 00:50:38,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2021-11-21 00:50:38,640 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 168. [2021-11-21 00:50:38,641 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 168 states, 126 states have (on average 1.0158730158730158) internal successors, (128), 126 states have internal predecessors, (128), 21 states have call successors, (21), 21 states have call predecessors, (21), 20 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2021-11-21 00:50:38,642 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 169 transitions. [2021-11-21 00:50:38,642 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 169 transitions. Word has length 157 [2021-11-21 00:50:38,642 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:50:38,642 INFO L470 AbstractCegarLoop]: Abstraction has 168 states and 169 transitions. [2021-11-21 00:50:38,643 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 2.782608695652174) internal successors, (64), 23 states have internal predecessors, (64), 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) [2021-11-21 00:50:38,643 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 169 transitions. [2021-11-21 00:50:38,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2021-11-21 00:50:38,644 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:50:38,644 INFO L514 BasicCegarLoop]: trace histogram [21, 20, 20, 20, 20, 20, 20, 19, 1, 1, 1, 1, 1] [2021-11-21 00:50:38,654 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2021-11-21 00:50:38,850 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-11-21 00:50:38,851 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:50:38,851 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:50:38,851 INFO L85 PathProgramCache]: Analyzing trace with hash -694185097, now seen corresponding path program 19 times [2021-11-21 00:50:38,851 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:50:38,851 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1165640479] [2021-11-21 00:50:38,851 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:50:38,851 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:50:38,857 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 00:50:38,857 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2106021397] [2021-11-21 00:50:38,858 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:50:38,858 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:50:38,858 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:50:38,859 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:50:38,860 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-21 00:50:39,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:50:39,491 INFO L263 TraceCheckSpWp]: Trace formula consists of 458 conjuncts, 84 conjunts are in the unsatisfiable core [2021-11-21 00:50:39,494 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:50:40,230 INFO L134 CoverageAnalysis]: Checked inductivity of 1560 backedges. 40 proven. 760 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2021-11-21 00:50:40,230 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:50:40,469 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:50:40,469 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1165640479] [2021-11-21 00:50:40,469 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 00:50:40,469 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2106021397] [2021-11-21 00:50:40,469 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2106021397] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:50:40,469 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [513703170] [2021-11-21 00:50:40,470 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 00:50:40,471 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:50:40,471 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:50:40,471 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:50:40,471 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:50:55,001 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 21 for LOIs [2021-11-21 00:50:55,078 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:50:55,691 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:50:55,691 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:50:55,691 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2021-11-21 00:50:55,691 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1724255274] [2021-11-21 00:50:55,691 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-21 00:50:55,691 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-21 00:50:55,691 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:50:55,692 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-21 00:50:55,692 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=1225, Unknown=0, NotChecked=0, Total=1332 [2021-11-21 00:50:55,693 INFO L87 Difference]: Start difference. First operand 168 states and 169 transitions. Second operand has 25 states, 24 states have (on average 2.7916666666666665) internal successors, (67), 24 states have internal predecessors, (67), 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) [2021-11-21 00:50:56,346 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:50:56,346 INFO L93 Difference]: Finished difference Result 175 states and 177 transitions. [2021-11-21 00:50:56,347 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-21 00:50:56,347 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 2.7916666666666665) internal successors, (67), 24 states have internal predecessors, (67), 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 165 [2021-11-21 00:50:56,347 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:50:56,351 INFO L225 Difference]: With dead ends: 175 [2021-11-21 00:50:56,351 INFO L226 Difference]: Without dead ends: 170 [2021-11-21 00:50:56,351 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 345 GetRequests, 307 SyntacticMatches, 1 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=118, Invalid=1364, Unknown=0, NotChecked=0, Total=1482 [2021-11-21 00:50:56,352 INFO L933 BasicCegarLoop]: 88 mSDtfsCounter, 2 mSDsluCounter, 1541 mSDsCounter, 0 mSdLazyCounter, 955 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 1627 SdHoareTripleChecker+Invalid, 955 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 955 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-21 00:50:56,352 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 1627 Invalid, 955 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 955 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-21 00:50:56,353 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2021-11-21 00:50:56,363 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 170. [2021-11-21 00:50:56,363 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 170 states, 127 states have (on average 1.015748031496063) internal successors, (129), 127 states have internal predecessors, (129), 22 states have call successors, (22), 21 states have call predecessors, (22), 20 states have return successors, (21), 21 states have call predecessors, (21), 21 states have call successors, (21) [2021-11-21 00:50:56,365 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 170 states to 170 states and 172 transitions. [2021-11-21 00:50:56,365 INFO L78 Accepts]: Start accepts. Automaton has 170 states and 172 transitions. Word has length 165 [2021-11-21 00:50:56,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:50:56,365 INFO L470 AbstractCegarLoop]: Abstraction has 170 states and 172 transitions. [2021-11-21 00:50:56,366 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 24 states have (on average 2.7916666666666665) internal successors, (67), 24 states have internal predecessors, (67), 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) [2021-11-21 00:50:56,366 INFO L276 IsEmpty]: Start isEmpty. Operand 170 states and 172 transitions. [2021-11-21 00:50:56,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2021-11-21 00:50:56,368 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:50:56,368 INFO L514 BasicCegarLoop]: trace histogram [21, 21, 20, 20, 20, 20, 20, 20, 1, 1, 1, 1, 1] [2021-11-21 00:50:56,374 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-11-21 00:50:56,573 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:50:56,577 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:50:56,577 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:50:56,577 INFO L85 PathProgramCache]: Analyzing trace with hash -606660388, now seen corresponding path program 4 times [2021-11-21 00:50:56,577 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:50:56,577 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [100445632] [2021-11-21 00:50:56,578 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:50:56,578 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:50:56,588 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 00:50:56,588 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [408534059] [2021-11-21 00:50:56,588 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:50:56,588 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:50:56,588 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:50:56,589 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:50:56,626 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-21 00:50:57,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-11-21 00:50:57,415 INFO L355 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-11-21 00:50:57,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-11-21 00:50:57,813 INFO L133 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2021-11-21 00:50:57,813 INFO L628 BasicCegarLoop]: Counterexample is feasible [2021-11-21 00:50:57,814 INFO L764 garLoopResultBuilder]: Registering result UNSAFE for location __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2021-11-21 00:50:57,825 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2021-11-21 00:50:58,022 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-11-21 00:50:58,025 INFO L732 BasicCegarLoop]: Path program histogram: [19, 4, 1, 1, 1, 1] [2021-11-21 00:50:58,027 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-11-21 00:50:58,119 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.11 12:50:58 BoogieIcfgContainer [2021-11-21 00:50:58,119 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-11-21 00:50:58,120 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-11-21 00:50:58,120 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-11-21 00:50:58,120 INFO L275 PluginConnector]: Witness Printer initialized [2021-11-21 00:50:58,120 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 12:42:52" (3/4) ... [2021-11-21 00:50:58,122 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2021-11-21 00:50:58,223 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/witness.graphml [2021-11-21 00:50:58,224 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-11-21 00:50:58,224 INFO L158 Benchmark]: Toolchain (without parser) took 486237.82ms. Allocated memory was 96.5MB in the beginning and 146.8MB in the end (delta: 50.3MB). Free memory was 55.4MB in the beginning and 100.6MB in the end (delta: -45.1MB). Peak memory consumption was 6.8MB. Max. memory is 16.1GB. [2021-11-21 00:50:58,225 INFO L158 Benchmark]: CDTParser took 0.24ms. Allocated memory is still 96.5MB. Free memory is still 71.3MB. There was no memory consumed. Max. memory is 16.1GB. [2021-11-21 00:50:58,225 INFO L158 Benchmark]: CACSL2BoogieTranslator took 393.89ms. Allocated memory is still 96.5MB. Free memory was 55.2MB in the beginning and 70.4MB in the end (delta: -15.2MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. [2021-11-21 00:50:58,225 INFO L158 Benchmark]: Boogie Procedure Inliner took 39.30ms. Allocated memory is still 96.5MB. Free memory was 70.4MB in the beginning and 68.9MB in the end (delta: 1.5MB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-21 00:50:58,226 INFO L158 Benchmark]: Boogie Preprocessor took 43.86ms. Allocated memory is still 96.5MB. Free memory was 68.9MB in the beginning and 68.0MB in the end (delta: 913.2kB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-11-21 00:50:58,226 INFO L158 Benchmark]: RCFGBuilder took 343.87ms. Allocated memory is still 96.5MB. Free memory was 68.0MB in the beginning and 58.4MB in the end (delta: 9.6MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2021-11-21 00:50:58,226 INFO L158 Benchmark]: TraceAbstraction took 485302.34ms. Allocated memory was 96.5MB in the beginning and 146.8MB in the end (delta: 50.3MB). Free memory was 58.1MB in the beginning and 108.9MB in the end (delta: -50.9MB). Peak memory consumption was 78.1MB. Max. memory is 16.1GB. [2021-11-21 00:50:58,227 INFO L158 Benchmark]: Witness Printer took 104.22ms. Allocated memory is still 146.8MB. Free memory was 108.9MB in the beginning and 100.6MB in the end (delta: 8.4MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2021-11-21 00:50:58,228 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.24ms. Allocated memory is still 96.5MB. Free memory is still 71.3MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 393.89ms. Allocated memory is still 96.5MB. Free memory was 55.2MB in the beginning and 70.4MB in the end (delta: -15.2MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 39.30ms. Allocated memory is still 96.5MB. Free memory was 70.4MB in the beginning and 68.9MB in the end (delta: 1.5MB). There was no memory consumed. Max. memory is 16.1GB. * Boogie Preprocessor took 43.86ms. Allocated memory is still 96.5MB. Free memory was 68.9MB in the beginning and 68.0MB in the end (delta: 913.2kB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * RCFGBuilder took 343.87ms. Allocated memory is still 96.5MB. Free memory was 68.0MB in the beginning and 58.4MB in the end (delta: 9.6MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. * TraceAbstraction took 485302.34ms. Allocated memory was 96.5MB in the beginning and 146.8MB in the end (delta: 50.3MB). Free memory was 58.1MB in the beginning and 108.9MB in the end (delta: -50.9MB). Peak memory consumption was 78.1MB. Max. memory is 16.1GB. * Witness Printer took 104.22ms. Allocated memory is still 146.8MB. Free memory was 108.9MB in the beginning and 100.6MB in the end (delta: 8.4MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - CounterExampleResult [Line: 12]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L17] int counter = 0; [L19] short k; [L20] long long y, x, c; [L21] k = __VERIFIER_nondet_short() [L23] y = 0 [L24] x = 0 [L25] c = 0 VAL [c=0, counter=0, k=21, x=0, y=0] [L27] EXPR counter++ VAL [c=0, counter=1, counter++=0, k=21, x=0, y=0] [L27] COND TRUE counter++<20 [L28] CALL __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [\old(cond)=1, counter=1] [L10] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=1] [L28] RET __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [c=0, counter=1, k=21, x=0, y=0] [L30] COND FALSE !(!(c < k)) [L33] c = c + 1 [L34] y = y + 1 [L35] x = y * y * y + x VAL [c=1, counter=1, k=21, x=1, y=1] [L27] EXPR counter++ VAL [c=1, counter=2, counter++=1, k=21, x=1, y=1] [L27] COND TRUE counter++<20 [L28] CALL __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [\old(cond)=1, counter=2] [L10] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=2] [L28] RET __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [c=1, counter=2, k=21, x=1, y=1] [L30] COND FALSE !(!(c < k)) [L33] c = c + 1 [L34] y = y + 1 [L35] x = y * y * y + x VAL [c=2, counter=2, k=21, x=9, y=2] [L27] EXPR counter++ VAL [c=2, counter=3, counter++=2, k=21, x=9, y=2] [L27] COND TRUE counter++<20 [L28] CALL __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [\old(cond)=1, counter=3] [L10] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=3] [L28] RET __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [c=2, counter=3, k=21, x=9, y=2] [L30] COND FALSE !(!(c < k)) [L33] c = c + 1 [L34] y = y + 1 [L35] x = y * y * y + x VAL [c=3, counter=3, k=21, x=36, y=3] [L27] EXPR counter++ VAL [c=3, counter=4, counter++=3, k=21, x=36, y=3] [L27] COND TRUE counter++<20 [L28] CALL __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [\old(cond)=1, counter=4] [L10] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=4] [L28] RET __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [c=3, counter=4, k=21, x=36, y=3] [L30] COND FALSE !(!(c < k)) [L33] c = c + 1 [L34] y = y + 1 [L35] x = y * y * y + x VAL [c=4, counter=4, k=21, x=100, y=4] [L27] EXPR counter++ VAL [c=4, counter=5, counter++=4, k=21, x=100, y=4] [L27] COND TRUE counter++<20 [L28] CALL __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [\old(cond)=1, counter=5] [L10] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=5] [L28] RET __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [c=4, counter=5, k=21, x=100, y=4] [L30] COND FALSE !(!(c < k)) [L33] c = c + 1 [L34] y = y + 1 [L35] x = y * y * y + x VAL [c=5, counter=5, k=21, x=225, y=5] [L27] EXPR counter++ VAL [c=5, counter=6, counter++=5, k=21, x=225, y=5] [L27] COND TRUE counter++<20 [L28] CALL __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [\old(cond)=1, counter=6] [L10] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=6] [L28] RET __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [c=5, counter=6, k=21, x=225, y=5] [L30] COND FALSE !(!(c < k)) [L33] c = c + 1 [L34] y = y + 1 [L35] x = y * y * y + x VAL [c=6, counter=6, k=21, x=441, y=6] [L27] EXPR counter++ VAL [c=6, counter=7, counter++=6, k=21, x=441, y=6] [L27] COND TRUE counter++<20 [L28] CALL __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [\old(cond)=1, counter=7] [L10] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=7] [L28] RET __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [c=6, counter=7, k=21, x=441, y=6] [L30] COND FALSE !(!(c < k)) [L33] c = c + 1 [L34] y = y + 1 [L35] x = y * y * y + x VAL [c=7, counter=7, k=21, x=784, y=7] [L27] EXPR counter++ VAL [c=7, counter=8, counter++=7, k=21, x=784, y=7] [L27] COND TRUE counter++<20 [L28] CALL __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [\old(cond)=1, counter=8] [L10] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=8] [L28] RET __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [c=7, counter=8, k=21, x=784, y=7] [L30] COND FALSE !(!(c < k)) [L33] c = c + 1 [L34] y = y + 1 [L35] x = y * y * y + x VAL [c=8, counter=8, k=21, x=1296, y=8] [L27] EXPR counter++ VAL [c=8, counter=9, counter++=8, k=21, x=1296, y=8] [L27] COND TRUE counter++<20 [L28] CALL __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [\old(cond)=1, counter=9] [L10] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=9] [L28] RET __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [c=8, counter=9, k=21, x=1296, y=8] [L30] COND FALSE !(!(c < k)) [L33] c = c + 1 [L34] y = y + 1 [L35] x = y * y * y + x VAL [c=9, counter=9, k=21, x=2025, y=9] [L27] EXPR counter++ VAL [c=9, counter=10, counter++=9, k=21, x=2025, y=9] [L27] COND TRUE counter++<20 [L28] CALL __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [\old(cond)=1, counter=10] [L10] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=10] [L28] RET __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [c=9, counter=10, k=21, x=2025, y=9] [L30] COND FALSE !(!(c < k)) [L33] c = c + 1 [L34] y = y + 1 [L35] x = y * y * y + x VAL [c=10, counter=10, k=21, x=3025, y=10] [L27] EXPR counter++ VAL [c=10, counter=11, counter++=10, k=21, x=3025, y=10] [L27] COND TRUE counter++<20 [L28] CALL __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [\old(cond)=1, counter=11] [L10] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=11] [L28] RET __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [c=10, counter=11, k=21, x=3025, y=10] [L30] COND FALSE !(!(c < k)) [L33] c = c + 1 [L34] y = y + 1 [L35] x = y * y * y + x VAL [c=11, counter=11, k=21, x=4356, y=11] [L27] EXPR counter++ VAL [c=11, counter=12, counter++=11, k=21, x=4356, y=11] [L27] COND TRUE counter++<20 [L28] CALL __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [\old(cond)=1, counter=12] [L10] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=12] [L28] RET __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [c=11, counter=12, k=21, x=4356, y=11] [L30] COND FALSE !(!(c < k)) [L33] c = c + 1 [L34] y = y + 1 [L35] x = y * y * y + x VAL [c=12, counter=12, k=21, x=6084, y=12] [L27] EXPR counter++ VAL [c=12, counter=13, counter++=12, k=21, x=6084, y=12] [L27] COND TRUE counter++<20 [L28] CALL __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [\old(cond)=1, counter=13] [L10] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=13] [L28] RET __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [c=12, counter=13, k=21, x=6084, y=12] [L30] COND FALSE !(!(c < k)) [L33] c = c + 1 [L34] y = y + 1 [L35] x = y * y * y + x VAL [c=13, counter=13, k=21, x=8281, y=13] [L27] EXPR counter++ VAL [c=13, counter=14, counter++=13, k=21, x=8281, y=13] [L27] COND TRUE counter++<20 [L28] CALL __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [\old(cond)=1, counter=14] [L10] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=14] [L28] RET __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [c=13, counter=14, k=21, x=8281, y=13] [L30] COND FALSE !(!(c < k)) [L33] c = c + 1 [L34] y = y + 1 [L35] x = y * y * y + x VAL [c=14, counter=14, k=21, x=11025, y=14] [L27] EXPR counter++ VAL [c=14, counter=15, counter++=14, k=21, x=11025, y=14] [L27] COND TRUE counter++<20 [L28] CALL __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [\old(cond)=1, counter=15] [L10] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=15] [L28] RET __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [c=14, counter=15, k=21, x=11025, y=14] [L30] COND FALSE !(!(c < k)) [L33] c = c + 1 [L34] y = y + 1 [L35] x = y * y * y + x VAL [c=15, counter=15, k=21, x=14400, y=15] [L27] EXPR counter++ VAL [c=15, counter=16, counter++=15, k=21, x=14400, y=15] [L27] COND TRUE counter++<20 [L28] CALL __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [\old(cond)=1, counter=16] [L10] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=16] [L28] RET __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [c=15, counter=16, k=21, x=14400, y=15] [L30] COND FALSE !(!(c < k)) [L33] c = c + 1 [L34] y = y + 1 [L35] x = y * y * y + x VAL [c=16, counter=16, k=21, x=18496, y=16] [L27] EXPR counter++ VAL [c=16, counter=17, counter++=16, k=21, x=18496, y=16] [L27] COND TRUE counter++<20 [L28] CALL __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [\old(cond)=1, counter=17] [L10] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=17] [L28] RET __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [c=16, counter=17, k=21, x=18496, y=16] [L30] COND FALSE !(!(c < k)) [L33] c = c + 1 [L34] y = y + 1 [L35] x = y * y * y + x VAL [c=17, counter=17, k=21, x=23409, y=17] [L27] EXPR counter++ VAL [c=17, counter=18, counter++=17, k=21, x=23409, y=17] [L27] COND TRUE counter++<20 [L28] CALL __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [\old(cond)=1, counter=18] [L10] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=18] [L28] RET __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [c=17, counter=18, k=21, x=23409, y=17] [L30] COND FALSE !(!(c < k)) [L33] c = c + 1 [L34] y = y + 1 [L35] x = y * y * y + x VAL [c=18, counter=18, k=21, x=29241, y=18] [L27] EXPR counter++ VAL [c=18, counter=19, counter++=18, k=21, x=29241, y=18] [L27] COND TRUE counter++<20 [L28] CALL __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [\old(cond)=1, counter=19] [L10] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=19] [L28] RET __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [c=18, counter=19, k=21, x=29241, y=18] [L30] COND FALSE !(!(c < k)) [L33] c = c + 1 [L34] y = y + 1 [L35] x = y * y * y + x VAL [c=19, counter=19, k=21, x=36100, y=19] [L27] EXPR counter++ VAL [c=19, counter=20, counter++=19, k=21, x=36100, y=19] [L27] COND TRUE counter++<20 [L28] CALL __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [\old(cond)=1, counter=20] [L10] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=20] [L28] RET __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [c=19, counter=20, k=21, x=36100, y=19] [L30] COND FALSE !(!(c < k)) [L33] c = c + 1 [L34] y = y + 1 [L35] x = y * y * y + x VAL [c=20, counter=20, k=21, x=44100, y=20] [L27] EXPR counter++ VAL [c=20, counter=21, counter++=20, k=21, x=44100, y=20] [L27] COND FALSE !(counter++<20) [L37] CALL __VERIFIER_assert(k*y - (y*y) == 0) VAL [\old(cond)=0, counter=21] [L10] COND TRUE !(cond) VAL [\old(cond)=0, cond=0, counter=21] [L12] reach_error() VAL [\old(cond)=0, cond=0, counter=21] - StatisticsResult: Ultimate Automizer benchmark data CFG has 2 procedures, 15 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 485.1s, OverallIterations: 27, TraceHistogramMax: 21, PathProgramHistogramMax: 19, EmptinessCheckTime: 0.0s, AutomataDifference: 7.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, PartialOrderReductionTime: 0.0s, HoareTripleCheckerStatistics: 0 mSolverCounterUnknown, 343 SdHoareTripleChecker+Valid, 5.5s IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 337 mSDsluCounter, 13858 SdHoareTripleChecker+Invalid, 4.7s Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 0 IncrementalHoareTripleChecker+Unchecked, 12815 mSDsCounter, 81 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 8005 IncrementalHoareTripleChecker+Invalid, 8086 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 81 mSolverCounterUnsat, 1089 mSDtfsCounter, 8005 mSolverCounterSat, 0.1s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 4606 GetRequests, 3894 SyntacticMatches, 22 SemanticMatches, 690 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 2387 ImplicationChecksByTransitivity, 29.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=170occurred in iteration=26, InterpolantAutomatonStates: 399, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.3s AutomataMinimizationTime, 26 MinimizatonAttempts, 80 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.2s SsaConstructionTime, 12.8s SatisfiabilityAnalysisTime, 31.1s InterpolantComputationTime, 2110 NumberOfCodeBlocks, 2110 NumberOfCodeBlocksAsserted, 95 NumberOfCheckSat, 2069 ConstructedInterpolants, 0 QuantifiedInterpolants, 8857 SizeOfPredicates, 61 NumberOfNonLiveVariables, 5692 ConjunctsInSsa, 1002 ConjunctsInUnsatCore, 30 InterpolantComputations, 4 PerfectInterpolantSequences, 6005/12004 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! [2021-11-21 00:50:58,297 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ef0383c-3a38-4211-b47e-190ea687901d/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE