./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound20.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_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/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_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound20.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/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_7725c67d-55aa-4352-919d-020699e4d03c/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 e587d407128aaafd417211e5ccf66790913a0bc1afeba03ae0cdb578f5831614 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-21 01:57:37,935 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-21 01:57:37,938 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-21 01:57:37,969 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-21 01:57:37,970 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-21 01:57:37,971 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-21 01:57:37,973 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-21 01:57:37,975 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-21 01:57:37,977 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-21 01:57:37,978 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-21 01:57:37,979 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-21 01:57:37,981 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-21 01:57:37,982 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-21 01:57:37,985 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-21 01:57:37,986 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-21 01:57:37,988 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-21 01:57:37,989 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-21 01:57:37,990 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-21 01:57:37,992 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-21 01:57:37,995 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-21 01:57:37,997 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-21 01:57:37,998 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-21 01:57:38,000 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-21 01:57:38,001 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-21 01:57:38,004 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-21 01:57:38,005 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-21 01:57:38,005 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-21 01:57:38,006 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-21 01:57:38,007 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-21 01:57:38,008 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-21 01:57:38,008 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-21 01:57:38,009 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-21 01:57:38,010 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-21 01:57:38,011 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-21 01:57:38,012 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-21 01:57:38,012 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-21 01:57:38,013 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-21 01:57:38,014 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-21 01:57:38,014 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-21 01:57:38,015 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-21 01:57:38,016 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-21 01:57:38,017 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-21 01:57:38,055 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-21 01:57:38,055 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-21 01:57:38,056 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-21 01:57:38,056 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-21 01:57:38,057 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-21 01:57:38,057 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-21 01:57:38,058 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-21 01:57:38,058 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-21 01:57:38,058 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-21 01:57:38,058 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-21 01:57:38,059 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-21 01:57:38,059 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-21 01:57:38,059 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-21 01:57:38,059 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-21 01:57:38,059 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-21 01:57:38,060 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-21 01:57:38,060 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-21 01:57:38,060 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-21 01:57:38,061 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-21 01:57:38,061 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-21 01:57:38,061 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-21 01:57:38,061 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-21 01:57:38,062 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-21 01:57:38,062 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-21 01:57:38,062 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-21 01:57:38,062 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-21 01:57:38,062 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-21 01:57:38,062 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-21 01:57:38,063 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-21 01:57:38,063 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-21 01:57:38,063 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-21 01:57:38,063 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-21 01:57:38,063 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:57:38,064 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-21 01:57:38,064 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-21 01:57:38,064 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-21 01:57:38,064 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-21 01:57:38,064 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-21 01:57:38,065 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-21 01:57:38,065 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-21 01:57:38,065 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-21 01:57:38,065 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_7725c67d-55aa-4352-919d-020699e4d03c/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> e587d407128aaafd417211e5ccf66790913a0bc1afeba03ae0cdb578f5831614 [2021-11-21 01:57:38,317 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-21 01:57:38,338 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-21 01:57:38,340 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-21 01:57:38,342 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-21 01:57:38,342 INFO L275 PluginConnector]: CDTParser initialized [2021-11-21 01:57:38,344 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound20.c [2021-11-21 01:57:38,407 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/data/6d8a93abf/007d4919ff0c4e11bb1f78dc3929b77d/FLAG6137f47f6 [2021-11-21 01:57:38,843 INFO L306 CDTParser]: Found 1 translation units. [2021-11-21 01:57:38,844 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound20.c [2021-11-21 01:57:38,850 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/data/6d8a93abf/007d4919ff0c4e11bb1f78dc3929b77d/FLAG6137f47f6 [2021-11-21 01:57:39,236 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/data/6d8a93abf/007d4919ff0c4e11bb1f78dc3929b77d [2021-11-21 01:57:39,239 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-21 01:57:39,240 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-21 01:57:39,242 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-21 01:57:39,242 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-21 01:57:39,246 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-21 01:57:39,246 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:57:39" (1/1) ... [2021-11-21 01:57:39,249 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2d9fa340 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:57:39, skipping insertion in model container [2021-11-21 01:57:39,249 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:57:39" (1/1) ... [2021-11-21 01:57:39,256 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-21 01:57:39,277 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-21 01:57:39,460 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_7725c67d-55aa-4352-919d-020699e4d03c/sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound20.c[490,503] [2021-11-21 01:57:39,479 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:57:39,488 INFO L203 MainTranslator]: Completed pre-run [2021-11-21 01:57:39,502 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_7725c67d-55aa-4352-919d-020699e4d03c/sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound20.c[490,503] [2021-11-21 01:57:39,513 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:57:39,526 INFO L208 MainTranslator]: Completed translation [2021-11-21 01:57:39,527 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:57:39 WrapperNode [2021-11-21 01:57:39,527 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-21 01:57:39,528 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-21 01:57:39,528 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-21 01:57:39,529 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-21 01:57:39,536 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:57:39" (1/1) ... [2021-11-21 01:57:39,543 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:57:39" (1/1) ... [2021-11-21 01:57:39,563 INFO L137 Inliner]: procedures = 14, calls = 19, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 77 [2021-11-21 01:57:39,563 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-21 01:57:39,564 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-21 01:57:39,564 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-21 01:57:39,564 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-21 01:57:39,573 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:57:39" (1/1) ... [2021-11-21 01:57:39,573 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:57:39" (1/1) ... [2021-11-21 01:57:39,575 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:57:39" (1/1) ... [2021-11-21 01:57:39,575 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:57:39" (1/1) ... [2021-11-21 01:57:39,579 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:57:39" (1/1) ... [2021-11-21 01:57:39,583 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:57:39" (1/1) ... [2021-11-21 01:57:39,584 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:57:39" (1/1) ... [2021-11-21 01:57:39,586 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-21 01:57:39,587 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-21 01:57:39,587 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-21 01:57:39,587 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-21 01:57:39,588 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:57:39" (1/1) ... [2021-11-21 01:57:39,596 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:57:39,606 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:57:39,619 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-21 01:57:39,653 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-21 01:57:39,668 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-21 01:57:39,668 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-11-21 01:57:39,668 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-11-21 01:57:39,668 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-21 01:57:39,669 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-21 01:57:39,669 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-21 01:57:39,669 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-11-21 01:57:39,669 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-11-21 01:57:39,736 INFO L236 CfgBuilder]: Building ICFG [2021-11-21 01:57:39,738 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-21 01:57:39,926 INFO L277 CfgBuilder]: Performing block encoding [2021-11-21 01:57:39,946 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-21 01:57:39,946 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-21 01:57:39,949 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:57:39 BoogieIcfgContainer [2021-11-21 01:57:39,949 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-21 01:57:39,950 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-21 01:57:39,951 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-21 01:57:39,954 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-21 01:57:39,955 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 01:57:39" (1/3) ... [2021-11-21 01:57:39,956 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@282ad76 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:57:39, skipping insertion in model container [2021-11-21 01:57:39,956 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:57:39" (2/3) ... [2021-11-21 01:57:39,956 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@282ad76 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:57:39, skipping insertion in model container [2021-11-21 01:57:39,957 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:57:39" (3/3) ... [2021-11-21 01:57:39,958 INFO L111 eAbstractionObserver]: Analyzing ICFG egcd2-ll_valuebound20.c [2021-11-21 01:57:39,973 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-21 01:57:39,974 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-21 01:57:40,058 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-21 01:57:40,066 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 01:57:40,066 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-21 01:57:40,096 INFO L276 IsEmpty]: Start isEmpty. Operand has 30 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 16 states have internal predecessors, (20), 12 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-11-21 01:57:40,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-21 01:57:40,101 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:57:40,101 INFO L514 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:57:40,102 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:57:40,107 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:57:40,107 INFO L85 PathProgramCache]: Analyzing trace with hash 966807424, now seen corresponding path program 1 times [2021-11-21 01:57:40,114 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:57:40,115 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2059954254] [2021-11-21 01:57:40,115 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:57:40,116 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:57:40,218 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:57:40,219 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [668073923] [2021-11-21 01:57:40,219 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:57:40,219 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:57:40,220 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:57:40,222 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:57:40,241 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-21 01:57:40,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:57:40,309 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 1 conjunts are in the unsatisfiable core [2021-11-21 01:57:40,315 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:57:40,445 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-21 01:57:40,445 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:57:40,446 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:57:40,446 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2059954254] [2021-11-21 01:57:40,446 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:57:40,447 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [668073923] [2021-11-21 01:57:40,447 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [668073923] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:57:40,447 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:57:40,448 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-21 01:57:40,450 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [714825841] [2021-11-21 01:57:40,450 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:57:40,454 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-21 01:57:40,455 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:57:40,480 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-21 01:57:40,481 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-21 01:57:40,483 INFO L87 Difference]: Start difference. First operand has 30 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 16 states have internal predecessors, (20), 12 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) Second operand has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2021-11-21 01:57:40,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:57:40,513 INFO L93 Difference]: Finished difference Result 49 states and 78 transitions. [2021-11-21 01:57:40,523 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-21 01:57:40,524 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) Word has length 26 [2021-11-21 01:57:40,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:57:40,532 INFO L225 Difference]: With dead ends: 49 [2021-11-21 01:57:40,532 INFO L226 Difference]: Without dead ends: 28 [2021-11-21 01:57:40,535 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 25 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 01:57:40,547 INFO L933 BasicCegarLoop]: 38 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 4 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:57:40,550 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 38 Invalid, 4 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:57:40,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-11-21 01:57:40,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2021-11-21 01:57:40,584 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 15 states have internal predecessors, (16), 12 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-11-21 01:57:40,586 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 39 transitions. [2021-11-21 01:57:40,587 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 39 transitions. Word has length 26 [2021-11-21 01:57:40,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:57:40,588 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 39 transitions. [2021-11-21 01:57:40,589 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2021-11-21 01:57:40,589 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 39 transitions. [2021-11-21 01:57:40,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-21 01:57:40,590 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:57:40,591 INFO L514 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:57:40,622 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-21 01:57:40,813 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2021-11-21 01:57:40,814 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:57:40,815 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:57:40,815 INFO L85 PathProgramCache]: Analyzing trace with hash 1643993843, now seen corresponding path program 1 times [2021-11-21 01:57:40,815 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:57:40,815 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [898214389] [2021-11-21 01:57:40,815 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:57:40,816 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:57:40,834 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:57:40,835 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1772444897] [2021-11-21 01:57:40,835 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:57:40,835 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:57:40,835 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:57:40,836 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:57:40,910 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-21 01:57:40,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:57:40,964 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-21 01:57:40,967 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:57:41,142 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-21 01:57:41,142 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:57:41,293 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-21 01:57:41,294 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:57:41,294 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [898214389] [2021-11-21 01:57:41,294 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:57:41,294 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1772444897] [2021-11-21 01:57:41,294 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1772444897] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:57:41,295 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1088984285] [2021-11-21 01:57:41,321 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-21 01:57:41,337 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:57:41,342 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:57:41,347 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:57:41,359 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:57:44,623 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 12 for LOIs [2021-11-21 01:57:44,636 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:57:45,122 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1088984285] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:57:45,122 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-21 01:57:45,123 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [5, 5] total 14 [2021-11-21 01:57:45,123 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [123975208] [2021-11-21 01:57:45,124 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:57:45,124 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-21 01:57:45,124 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:57:45,125 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-21 01:57:45,125 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=131, Unknown=0, NotChecked=0, Total=182 [2021-11-21 01:57:45,126 INFO L87 Difference]: Start difference. First operand 28 states and 39 transitions. Second operand has 11 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 6 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2021-11-21 01:57:45,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:57:45,315 INFO L93 Difference]: Finished difference Result 38 states and 50 transitions. [2021-11-21 01:57:45,315 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-21 01:57:45,315 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 6 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) Word has length 27 [2021-11-21 01:57:45,316 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:57:45,317 INFO L225 Difference]: With dead ends: 38 [2021-11-21 01:57:45,317 INFO L226 Difference]: Without dead ends: 30 [2021-11-21 01:57:45,317 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 63 SyntacticMatches, 4 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=51, Invalid=131, Unknown=0, NotChecked=0, Total=182 [2021-11-21 01:57:45,319 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 39 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 79 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 53 SdHoareTripleChecker+Invalid, 109 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 79 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:57:45,320 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 53 Invalid, 109 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 79 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:57:45,320 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-11-21 01:57:45,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2021-11-21 01:57:45,330 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 15 states have (on average 1.2) internal successors, (18), 16 states have internal predecessors, (18), 12 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-11-21 01:57:45,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 41 transitions. [2021-11-21 01:57:45,332 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 41 transitions. Word has length 27 [2021-11-21 01:57:45,332 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:57:45,332 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 41 transitions. [2021-11-21 01:57:45,332 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 6 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2021-11-21 01:57:45,333 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 41 transitions. [2021-11-21 01:57:45,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-21 01:57:45,334 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:57:45,334 INFO L514 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:57:45,375 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-21 01:57:45,561 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:57:45,562 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:57:45,562 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:57:45,562 INFO L85 PathProgramCache]: Analyzing trace with hash -575116102, now seen corresponding path program 1 times [2021-11-21 01:57:45,563 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:57:45,563 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1819975475] [2021-11-21 01:57:45,563 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:57:45,563 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:57:45,577 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:57:45,581 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [25346719] [2021-11-21 01:57:45,582 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:57:45,582 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:57:45,582 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:57:45,583 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:57:45,608 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-21 01:57:45,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:57:45,642 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-21 01:57:45,644 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:57:45,771 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-21 01:57:45,771 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:57:45,925 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-21 01:57:45,925 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:57:45,925 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1819975475] [2021-11-21 01:57:45,926 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:57:45,926 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [25346719] [2021-11-21 01:57:45,926 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [25346719] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-21 01:57:45,926 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:57:45,927 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [8] total 9 [2021-11-21 01:57:45,927 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [780570391] [2021-11-21 01:57:45,927 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:57:45,928 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 01:57:45,928 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:57:45,928 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 01:57:45,928 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-11-21 01:57:45,929 INFO L87 Difference]: Start difference. First operand 30 states and 41 transitions. Second operand has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2021-11-21 01:57:46,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:57:46,048 INFO L93 Difference]: Finished difference Result 36 states and 46 transitions. [2021-11-21 01:57:46,048 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 01:57:46,048 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), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) Word has length 28 [2021-11-21 01:57:46,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:57:46,049 INFO L225 Difference]: With dead ends: 36 [2021-11-21 01:57:46,050 INFO L226 Difference]: Without dead ends: 34 [2021-11-21 01:57:46,050 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-11-21 01:57:46,051 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 6 mSDsluCounter, 85 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 111 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:57:46,052 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 111 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:57:46,053 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-11-21 01:57:46,062 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2021-11-21 01:57:46,062 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 19 states have internal predecessors, (21), 12 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-11-21 01:57:46,064 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 44 transitions. [2021-11-21 01:57:46,064 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 44 transitions. Word has length 28 [2021-11-21 01:57:46,064 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:57:46,064 INFO L470 AbstractCegarLoop]: Abstraction has 34 states and 44 transitions. [2021-11-21 01:57:46,065 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), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2021-11-21 01:57:46,071 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 44 transitions. [2021-11-21 01:57:46,072 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-21 01:57:46,072 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:57:46,072 INFO L514 BasicCegarLoop]: trace histogram [6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:57:46,126 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-21 01:57:46,273 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:57:46,273 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:57:46,274 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:57:46,274 INFO L85 PathProgramCache]: Analyzing trace with hash -1810277145, now seen corresponding path program 1 times [2021-11-21 01:57:46,274 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:57:46,274 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [876873539] [2021-11-21 01:57:46,274 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:57:46,274 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:57:46,293 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:57:46,293 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1956819260] [2021-11-21 01:57:46,293 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:57:46,293 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:57:46,294 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:57:46,300 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:57:46,345 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-21 01:57:46,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:57:46,378 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-21 01:57:46,381 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:57:46,602 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 5 proven. 5 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-21 01:57:46,602 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:57:46,835 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-21 01:57:46,835 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:57:46,836 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [876873539] [2021-11-21 01:57:46,836 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:57:46,836 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1956819260] [2021-11-21 01:57:46,836 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1956819260] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-21 01:57:46,836 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:57:46,836 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [8] total 9 [2021-11-21 01:57:46,837 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [721431647] [2021-11-21 01:57:46,837 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:57:46,837 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 01:57:46,837 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:57:46,838 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 01:57:46,838 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-11-21 01:57:46,838 INFO L87 Difference]: Start difference. First operand 34 states and 44 transitions. Second operand has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-21 01:57:46,945 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:57:46,945 INFO L93 Difference]: Finished difference Result 47 states and 61 transitions. [2021-11-21 01:57:46,946 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 01:57:46,946 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 33 [2021-11-21 01:57:46,947 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:57:46,949 INFO L225 Difference]: With dead ends: 47 [2021-11-21 01:57:46,949 INFO L226 Difference]: Without dead ends: 45 [2021-11-21 01:57:46,949 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 56 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-11-21 01:57:46,952 INFO L933 BasicCegarLoop]: 39 mSDtfsCounter, 7 mSDsluCounter, 103 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 137 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:57:46,953 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 137 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:57:46,954 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-11-21 01:57:46,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 44. [2021-11-21 01:57:46,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 23 states have (on average 1.173913043478261) internal successors, (27), 24 states have internal predecessors, (27), 16 states have call successors, (16), 4 states have call predecessors, (16), 4 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-11-21 01:57:46,971 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 58 transitions. [2021-11-21 01:57:46,972 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 58 transitions. Word has length 33 [2021-11-21 01:57:46,972 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:57:46,974 INFO L470 AbstractCegarLoop]: Abstraction has 44 states and 58 transitions. [2021-11-21 01:57:46,975 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-21 01:57:46,975 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 58 transitions. [2021-11-21 01:57:46,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-11-21 01:57:46,979 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:57:46,979 INFO L514 BasicCegarLoop]: trace histogram [6, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:57:47,016 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-21 01:57:47,197 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:57:47,198 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:57:47,198 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:57:47,198 INFO L85 PathProgramCache]: Analyzing trace with hash -1313498982, now seen corresponding path program 1 times [2021-11-21 01:57:47,198 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:57:47,199 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1597863373] [2021-11-21 01:57:47,199 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:57:47,199 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:57:47,212 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:57:47,212 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [617902459] [2021-11-21 01:57:47,213 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:57:47,213 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:57:47,213 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:57:47,214 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:57:47,217 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-21 01:57:47,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:57:47,262 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-21 01:57:47,264 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:57:47,461 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 7 proven. 2 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2021-11-21 01:57:47,462 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:57:47,511 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:57:47,511 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1597863373] [2021-11-21 01:57:47,511 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:57:47,511 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [617902459] [2021-11-21 01:57:47,512 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [617902459] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:57:47,512 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1918830116] [2021-11-21 01:57:47,515 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2021-11-21 01:57:47,515 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:57:47,515 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:57:47,516 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:57:47,516 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:57:52,231 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 38 for LOIs [2021-11-21 01:57:52,351 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 12 for LOIs [2021-11-21 01:57:52,363 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:57:53,197 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1918830116] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:57:53,197 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:57:53,197 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [7] total 19 [2021-11-21 01:57:53,197 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1661027012] [2021-11-21 01:57:53,198 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:57:53,198 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-21 01:57:53,198 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:57:53,199 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-21 01:57:53,199 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=301, Unknown=0, NotChecked=0, Total=380 [2021-11-21 01:57:53,199 INFO L87 Difference]: Start difference. First operand 44 states and 58 transitions. Second operand has 14 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 7 states have internal predecessors, (12), 6 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) [2021-11-21 01:57:53,640 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:57:53,640 INFO L93 Difference]: Finished difference Result 65 states and 81 transitions. [2021-11-21 01:57:53,641 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-21 01:57:53,641 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 7 states have internal predecessors, (12), 6 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) Word has length 38 [2021-11-21 01:57:53,642 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:57:53,643 INFO L225 Difference]: With dead ends: 65 [2021-11-21 01:57:53,643 INFO L226 Difference]: Without dead ends: 63 [2021-11-21 01:57:53,643 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 56 SyntacticMatches, 6 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=79, Invalid=301, Unknown=0, NotChecked=0, Total=380 [2021-11-21 01:57:53,646 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 37 mSDsluCounter, 35 mSDsCounter, 0 mSdLazyCounter, 214 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 252 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 214 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:57:53,646 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 59 Invalid, 252 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 214 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 01:57:53,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-11-21 01:57:53,661 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 61. [2021-11-21 01:57:53,661 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 33 states have (on average 1.121212121212121) internal successors, (37), 35 states have internal predecessors, (37), 20 states have call successors, (20), 7 states have call predecessors, (20), 7 states have return successors, (19), 18 states have call predecessors, (19), 19 states have call successors, (19) [2021-11-21 01:57:53,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 76 transitions. [2021-11-21 01:57:53,663 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 76 transitions. Word has length 38 [2021-11-21 01:57:53,664 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:57:53,664 INFO L470 AbstractCegarLoop]: Abstraction has 61 states and 76 transitions. [2021-11-21 01:57:53,664 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 7 states have internal predecessors, (12), 6 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) [2021-11-21 01:57:53,664 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 76 transitions. [2021-11-21 01:57:53,665 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-21 01:57:53,665 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:57:53,666 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:57:53,712 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-21 01:57:53,893 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:57:53,894 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:57:53,894 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:57:53,894 INFO L85 PathProgramCache]: Analyzing trace with hash 434944611, now seen corresponding path program 1 times [2021-11-21 01:57:53,894 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:57:53,894 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2050371802] [2021-11-21 01:57:53,895 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:57:53,895 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:57:53,908 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:57:53,909 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1473017155] [2021-11-21 01:57:53,909 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:57:53,909 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:57:53,909 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:57:53,910 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:57:53,913 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-21 01:57:53,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:57:53,958 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-21 01:57:53,961 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:57:54,078 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-11-21 01:57:54,078 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:57:54,208 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-11-21 01:57:54,208 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:57:54,209 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2050371802] [2021-11-21 01:57:54,209 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:57:54,209 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1473017155] [2021-11-21 01:57:54,209 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1473017155] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:57:54,211 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1681227272] [2021-11-21 01:57:54,218 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2021-11-21 01:57:54,218 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:57:54,219 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:57:54,219 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:57:54,220 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:58:48,468 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2021-11-21 01:58:48,611 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 12 for LOIs [2021-11-21 01:58:48,624 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:58:50,685 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1681227272] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:58:50,685 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-21 01:58:50,686 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [7, 7] total 21 [2021-11-21 01:58:50,686 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2123863444] [2021-11-21 01:58:50,686 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:58:50,686 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-21 01:58:50,686 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:58:50,687 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-21 01:58:50,687 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=321, Unknown=0, NotChecked=0, Total=420 [2021-11-21 01:58:50,687 INFO L87 Difference]: Start difference. First operand 61 states and 76 transitions. Second operand has 16 states, 10 states have (on average 1.5) internal successors, (15), 9 states have internal predecessors, (15), 7 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 7 states have call predecessors, (10), 6 states have call successors, (10) [2021-11-21 01:58:51,307 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:58:51,307 INFO L93 Difference]: Finished difference Result 87 states and 108 transitions. [2021-11-21 01:58:51,308 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-21 01:58:51,308 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 10 states have (on average 1.5) internal successors, (15), 9 states have internal predecessors, (15), 7 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 7 states have call predecessors, (10), 6 states have call successors, (10) Word has length 52 [2021-11-21 01:58:51,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:58:51,309 INFO L225 Difference]: With dead ends: 87 [2021-11-21 01:58:51,309 INFO L226 Difference]: Without dead ends: 79 [2021-11-21 01:58:51,310 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 126 SyntacticMatches, 9 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=99, Invalid=321, Unknown=0, NotChecked=0, Total=420 [2021-11-21 01:58:51,311 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 16 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 271 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 69 SdHoareTripleChecker+Invalid, 284 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 271 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-21 01:58:51,312 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 69 Invalid, 284 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 271 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-21 01:58:51,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2021-11-21 01:58:51,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2021-11-21 01:58:51,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 45 states have (on average 1.1333333333333333) internal successors, (51), 46 states have internal predecessors, (51), 24 states have call successors, (24), 9 states have call predecessors, (24), 9 states have return successors, (23), 23 states have call predecessors, (23), 23 states have call successors, (23) [2021-11-21 01:58:51,334 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 98 transitions. [2021-11-21 01:58:51,334 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 98 transitions. Word has length 52 [2021-11-21 01:58:51,334 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:58:51,335 INFO L470 AbstractCegarLoop]: Abstraction has 79 states and 98 transitions. [2021-11-21 01:58:51,335 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 10 states have (on average 1.5) internal successors, (15), 9 states have internal predecessors, (15), 7 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 7 states have call predecessors, (10), 6 states have call successors, (10) [2021-11-21 01:58:51,335 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 98 transitions. [2021-11-21 01:58:51,336 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-21 01:58:51,336 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:58:51,337 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:58:51,381 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-21 01:58:51,557 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:58:51,558 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:58:51,558 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:58:51,558 INFO L85 PathProgramCache]: Analyzing trace with hash -331691367, now seen corresponding path program 1 times [2021-11-21 01:58:51,558 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:58:51,558 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2033326729] [2021-11-21 01:58:51,558 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:58:51,558 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:58:51,568 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:58:51,568 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [636616726] [2021-11-21 01:58:51,568 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:58:51,569 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:58:51,569 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:58:51,571 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:58:51,590 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-21 01:58:51,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:58:51,630 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-21 01:58:51,633 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:58:51,777 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 21 proven. 10 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2021-11-21 01:58:51,777 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:58:51,948 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 21 proven. 10 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2021-11-21 01:58:51,949 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:58:51,949 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2033326729] [2021-11-21 01:58:51,949 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:58:51,950 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [636616726] [2021-11-21 01:58:51,950 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [636616726] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:58:51,950 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [72433667] [2021-11-21 01:58:51,952 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2021-11-21 01:58:51,952 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:58:51,953 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:58:51,953 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:58:51,953 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:59:12,220 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 26 for LOIs [2021-11-21 01:59:12,326 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 12 for LOIs [2021-11-21 01:59:12,336 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:59:13,248 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:59:13,248 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 01:59:13,248 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 9 [2021-11-21 01:59:13,248 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [176634601] [2021-11-21 01:59:13,248 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 01:59:13,249 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-21 01:59:13,249 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:59:13,249 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-21 01:59:13,251 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=455, Unknown=0, NotChecked=0, Total=552 [2021-11-21 01:59:13,252 INFO L87 Difference]: Start difference. First operand 79 states and 98 transitions. Second operand has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 2 states have call successors, (14), 3 states have call predecessors, (14), 2 states have return successors, (12), 2 states have call predecessors, (12), 2 states have call successors, (12) [2021-11-21 01:59:13,388 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:59:13,388 INFO L93 Difference]: Finished difference Result 93 states and 113 transitions. [2021-11-21 01:59:13,389 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-21 01:59:13,389 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 2 states have call successors, (14), 3 states have call predecessors, (14), 2 states have return successors, (12), 2 states have call predecessors, (12), 2 states have call successors, (12) Word has length 60 [2021-11-21 01:59:13,390 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:59:13,392 INFO L225 Difference]: With dead ends: 93 [2021-11-21 01:59:13,392 INFO L226 Difference]: Without dead ends: 91 [2021-11-21 01:59:13,393 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 153 SyntacticMatches, 3 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 144 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=114, Invalid=536, Unknown=0, NotChecked=0, Total=650 [2021-11-21 01:59:13,394 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 14 mSDsluCounter, 135 mSDsCounter, 0 mSdLazyCounter, 127 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 151 SdHoareTripleChecker+Invalid, 130 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 127 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:59:13,394 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 151 Invalid, 130 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 127 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:59:13,395 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2021-11-21 01:59:13,416 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2021-11-21 01:59:13,416 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 52 states have (on average 1.1153846153846154) internal successors, (58), 54 states have internal predecessors, (58), 27 states have call successors, (27), 11 states have call predecessors, (27), 11 states have return successors, (26), 25 states have call predecessors, (26), 26 states have call successors, (26) [2021-11-21 01:59:13,418 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 111 transitions. [2021-11-21 01:59:13,418 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 111 transitions. Word has length 60 [2021-11-21 01:59:13,419 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:59:13,419 INFO L470 AbstractCegarLoop]: Abstraction has 91 states and 111 transitions. [2021-11-21 01:59:13,419 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 2 states have call successors, (14), 3 states have call predecessors, (14), 2 states have return successors, (12), 2 states have call predecessors, (12), 2 states have call successors, (12) [2021-11-21 01:59:13,419 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 111 transitions. [2021-11-21 01:59:13,421 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-21 01:59:13,421 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:59:13,421 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 6, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:59:13,458 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-21 01:59:13,637 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:59:13,638 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:59:13,638 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:59:13,638 INFO L85 PathProgramCache]: Analyzing trace with hash 1984692712, now seen corresponding path program 2 times [2021-11-21 01:59:13,638 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:59:13,638 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [345901974] [2021-11-21 01:59:13,638 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:59:13,638 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:59:13,648 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:59:13,648 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1925115018] [2021-11-21 01:59:13,648 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:59:13,648 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:59:13,648 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:59:13,649 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:59:13,665 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-21 01:59:13,699 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-21 01:59:13,699 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:59:13,703 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-21 01:59:13,705 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:59:13,913 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 27 proven. 10 refuted. 0 times theorem prover too weak. 96 trivial. 0 not checked. [2021-11-21 01:59:13,913 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:59:14,143 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 27 proven. 10 refuted. 0 times theorem prover too weak. 96 trivial. 0 not checked. [2021-11-21 01:59:14,144 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:59:14,144 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [345901974] [2021-11-21 01:59:14,144 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:59:14,144 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1925115018] [2021-11-21 01:59:14,144 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1925115018] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:59:14,148 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1321177952] [2021-11-21 01:59:14,154 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2021-11-21 01:59:14,154 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:59:14,154 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:59:14,155 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:59:14,155 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:59:34,280 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 26 for LOIs [2021-11-21 01:59:34,384 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 12 for LOIs [2021-11-21 01:59:34,396 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:59:35,519 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:59:35,519 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 01:59:35,519 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 9 [2021-11-21 01:59:35,519 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [675651215] [2021-11-21 01:59:35,519 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 01:59:35,520 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-21 01:59:35,520 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:59:35,520 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-21 01:59:35,520 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=455, Unknown=0, NotChecked=0, Total=552 [2021-11-21 01:59:35,521 INFO L87 Difference]: Start difference. First operand 91 states and 111 transitions. Second operand has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 2 states have call successors, (15), 3 states have call predecessors, (15), 2 states have return successors, (13), 2 states have call predecessors, (13), 2 states have call successors, (13) [2021-11-21 01:59:35,700 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:59:35,700 INFO L93 Difference]: Finished difference Result 98 states and 118 transitions. [2021-11-21 01:59:35,700 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-21 01:59:35,701 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 2 states have call successors, (15), 3 states have call predecessors, (15), 2 states have return successors, (13), 2 states have call predecessors, (13), 2 states have call successors, (13) Word has length 65 [2021-11-21 01:59:35,702 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:59:35,703 INFO L225 Difference]: With dead ends: 98 [2021-11-21 01:59:35,703 INFO L226 Difference]: Without dead ends: 96 [2021-11-21 01:59:35,704 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 168 SyntacticMatches, 3 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 144 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=114, Invalid=536, Unknown=0, NotChecked=0, Total=650 [2021-11-21 01:59:35,705 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 14 mSDsluCounter, 135 mSDsCounter, 0 mSdLazyCounter, 134 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 151 SdHoareTripleChecker+Invalid, 137 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 134 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:59:35,705 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 151 Invalid, 137 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 134 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:59:35,706 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2021-11-21 01:59:35,729 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 96. [2021-11-21 01:59:35,729 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 55 states have (on average 1.1090909090909091) internal successors, (61), 57 states have internal predecessors, (61), 28 states have call successors, (28), 12 states have call predecessors, (28), 12 states have return successors, (27), 26 states have call predecessors, (27), 27 states have call successors, (27) [2021-11-21 01:59:35,731 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 116 transitions. [2021-11-21 01:59:35,731 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 116 transitions. Word has length 65 [2021-11-21 01:59:35,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:59:35,732 INFO L470 AbstractCegarLoop]: Abstraction has 96 states and 116 transitions. [2021-11-21 01:59:35,732 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 2 states have call successors, (15), 3 states have call predecessors, (15), 2 states have return successors, (13), 2 states have call predecessors, (13), 2 states have call successors, (13) [2021-11-21 01:59:35,733 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 116 transitions. [2021-11-21 01:59:35,734 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-21 01:59:35,734 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:59:35,735 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 6, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:59:35,775 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-21 01:59:35,957 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-11-21 01:59:35,958 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:59:35,958 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:59:35,958 INFO L85 PathProgramCache]: Analyzing trace with hash -2003369438, now seen corresponding path program 1 times [2021-11-21 01:59:35,958 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:59:35,958 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1663087259] [2021-11-21 01:59:35,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:59:35,959 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:59:35,969 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:59:35,974 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1704199152] [2021-11-21 01:59:35,975 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:59:35,975 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:59:35,975 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:59:35,976 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:59:35,978 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-21 01:59:36,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:59:36,033 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-21 01:59:36,037 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:59:36,559 INFO L134 CoverageAnalysis]: Checked inductivity of 166 backedges. 16 proven. 8 refuted. 0 times theorem prover too weak. 142 trivial. 0 not checked. [2021-11-21 01:59:36,559 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:59:37,354 INFO L134 CoverageAnalysis]: Checked inductivity of 166 backedges. 16 proven. 8 refuted. 0 times theorem prover too weak. 142 trivial. 0 not checked. [2021-11-21 01:59:37,354 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:59:37,354 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1663087259] [2021-11-21 01:59:37,354 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:59:37,354 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1704199152] [2021-11-21 01:59:37,354 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1704199152] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:59:37,354 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [471122247] [2021-11-21 01:59:37,356 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2021-11-21 01:59:37,357 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:59:37,357 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:59:37,357 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:59:37,357 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 02:00:06,378 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2021-11-21 02:00:06,457 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 12 for LOIs [2021-11-21 02:00:06,468 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 02:00:14,531 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 02:00:14,531 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 02:00:14,531 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 16 [2021-11-21 02:00:14,532 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [104667197] [2021-11-21 02:00:14,532 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 02:00:14,532 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-21 02:00:14,533 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 02:00:14,533 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-21 02:00:14,534 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=1236, Unknown=0, NotChecked=0, Total=1406 [2021-11-21 02:00:14,534 INFO L87 Difference]: Start difference. First operand 96 states and 116 transitions. Second operand has 16 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 15 states have internal predecessors, (29), 9 states have call successors, (26), 2 states have call predecessors, (26), 1 states have return successors, (24), 7 states have call predecessors, (24), 7 states have call successors, (24) [2021-11-21 02:00:21,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 02:00:21,912 INFO L93 Difference]: Finished difference Result 170 states and 227 transitions. [2021-11-21 02:00:21,913 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-21 02:00:21,913 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 15 states have internal predecessors, (29), 9 states have call successors, (26), 2 states have call predecessors, (26), 1 states have return successors, (24), 7 states have call predecessors, (24), 7 states have call successors, (24) Word has length 74 [2021-11-21 02:00:21,913 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 02:00:21,915 INFO L225 Difference]: With dead ends: 170 [2021-11-21 02:00:21,915 INFO L226 Difference]: Without dead ends: 168 [2021-11-21 02:00:21,917 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 180 SyntacticMatches, 4 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 875 ImplicationChecksByTransitivity, 11.2s TimeCoverageRelationStatistics Valid=404, Invalid=2788, Unknown=0, NotChecked=0, Total=3192 [2021-11-21 02:00:21,917 INFO L933 BasicCegarLoop]: 72 mSDtfsCounter, 64 mSDsluCounter, 395 mSDsCounter, 0 mSdLazyCounter, 501 mSolverCounterSat, 166 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 456 SdHoareTripleChecker+Invalid, 667 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 166 IncrementalHoareTripleChecker+Valid, 501 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.7s IncrementalHoareTripleChecker+Time [2021-11-21 02:00:21,918 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [68 Valid, 456 Invalid, 667 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [166 Valid, 501 Invalid, 0 Unknown, 0 Unchecked, 4.7s Time] [2021-11-21 02:00:21,919 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2021-11-21 02:00:21,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 158. [2021-11-21 02:00:21,961 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 158 states, 85 states have (on average 1.188235294117647) internal successors, (101), 87 states have internal predecessors, (101), 57 states have call successors, (57), 15 states have call predecessors, (57), 15 states have return successors, (56), 55 states have call predecessors, (56), 56 states have call successors, (56) [2021-11-21 02:00:21,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 214 transitions. [2021-11-21 02:00:21,964 INFO L78 Accepts]: Start accepts. Automaton has 158 states and 214 transitions. Word has length 74 [2021-11-21 02:00:21,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 02:00:21,965 INFO L470 AbstractCegarLoop]: Abstraction has 158 states and 214 transitions. [2021-11-21 02:00:21,965 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 15 states have internal predecessors, (29), 9 states have call successors, (26), 2 states have call predecessors, (26), 1 states have return successors, (24), 7 states have call predecessors, (24), 7 states have call successors, (24) [2021-11-21 02:00:21,965 INFO L276 IsEmpty]: Start isEmpty. Operand 158 states and 214 transitions. [2021-11-21 02:00:21,967 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-21 02:00:21,967 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 02:00:21,968 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 6, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 02:00:21,994 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-21 02:00:22,177 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 02:00:22,178 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 02:00:22,178 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 02:00:22,178 INFO L85 PathProgramCache]: Analyzing trace with hash -134461569, now seen corresponding path program 1 times [2021-11-21 02:00:22,178 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 02:00:22,178 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1114100174] [2021-11-21 02:00:22,178 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 02:00:22,179 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 02:00:22,187 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 02:00:22,187 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1512982394] [2021-11-21 02:00:22,187 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 02:00:22,188 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 02:00:22,188 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 02:00:22,189 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 02:00:22,190 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-21 02:00:22,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 02:00:22,241 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-21 02:00:22,244 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 02:00:22,606 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 35 proven. 15 refuted. 0 times theorem prover too weak. 150 trivial. 0 not checked. [2021-11-21 02:00:22,606 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 02:00:22,854 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 39 proven. 7 refuted. 0 times theorem prover too weak. 154 trivial. 0 not checked. [2021-11-21 02:00:22,854 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 02:00:22,854 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1114100174] [2021-11-21 02:00:22,854 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 02:00:22,854 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1512982394] [2021-11-21 02:00:22,854 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1512982394] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 02:00:22,854 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [167553533] [2021-11-21 02:00:22,856 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2021-11-21 02:00:22,857 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 02:00:22,857 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 02:00:22,857 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 02:00:22,857 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 02:00:37,546 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2021-11-21 02:00:37,609 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 12 for LOIs [2021-11-21 02:00:37,622 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 02:00:41,281 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 02:00:41,281 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 02:00:41,282 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9] total 15 [2021-11-21 02:00:41,282 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [612928887] [2021-11-21 02:00:41,282 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 02:00:41,283 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-21 02:00:41,283 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 02:00:41,283 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-21 02:00:41,284 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=1102, Unknown=0, NotChecked=0, Total=1260 [2021-11-21 02:00:41,284 INFO L87 Difference]: Start difference. First operand 158 states and 214 transitions. Second operand has 15 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 14 states have internal predecessors, (33), 7 states have call successors, (25), 2 states have call predecessors, (25), 2 states have return successors, (24), 7 states have call predecessors, (24), 7 states have call successors, (24) [2021-11-21 02:00:43,321 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 02:00:43,321 INFO L93 Difference]: Finished difference Result 191 states and 251 transitions. [2021-11-21 02:00:43,321 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-21 02:00:43,321 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 14 states have internal predecessors, (33), 7 states have call successors, (25), 2 states have call predecessors, (25), 2 states have return successors, (24), 7 states have call predecessors, (24), 7 states have call successors, (24) Word has length 79 [2021-11-21 02:00:43,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 02:00:43,323 INFO L225 Difference]: With dead ends: 191 [2021-11-21 02:00:43,324 INFO L226 Difference]: Without dead ends: 185 [2021-11-21 02:00:43,325 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 249 GetRequests, 200 SyntacticMatches, 6 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 537 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=233, Invalid=1747, Unknown=0, NotChecked=0, Total=1980 [2021-11-21 02:00:43,326 INFO L933 BasicCegarLoop]: 37 mSDtfsCounter, 37 mSDsluCounter, 251 mSDsCounter, 0 mSdLazyCounter, 380 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 277 SdHoareTripleChecker+Invalid, 451 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 380 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2021-11-21 02:00:43,326 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 277 Invalid, 451 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 380 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2021-11-21 02:00:43,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185 states. [2021-11-21 02:00:43,362 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 185 to 165. [2021-11-21 02:00:43,362 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 165 states, 97 states have (on average 1.1237113402061856) internal successors, (109), 101 states have internal predecessors, (109), 50 states have call successors, (50), 17 states have call predecessors, (50), 17 states have return successors, (49), 46 states have call predecessors, (49), 49 states have call successors, (49) [2021-11-21 02:00:43,365 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 208 transitions. [2021-11-21 02:00:43,365 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 208 transitions. Word has length 79 [2021-11-21 02:00:43,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 02:00:43,365 INFO L470 AbstractCegarLoop]: Abstraction has 165 states and 208 transitions. [2021-11-21 02:00:43,366 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 14 states have internal predecessors, (33), 7 states have call successors, (25), 2 states have call predecessors, (25), 2 states have return successors, (24), 7 states have call predecessors, (24), 7 states have call successors, (24) [2021-11-21 02:00:43,366 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 208 transitions. [2021-11-21 02:00:43,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2021-11-21 02:00:43,368 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 02:00:43,368 INFO L514 BasicCegarLoop]: trace histogram [12, 11, 11, 6, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 02:00:43,395 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2021-11-21 02:00:43,581 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 02:00:43,581 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 02:00:43,582 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 02:00:43,582 INFO L85 PathProgramCache]: Analyzing trace with hash 145896886, now seen corresponding path program 1 times [2021-11-21 02:00:43,582 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 02:00:43,582 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [613547260] [2021-11-21 02:00:43,582 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 02:00:43,582 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 02:00:43,591 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 02:00:43,591 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1796075067] [2021-11-21 02:00:43,591 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 02:00:43,591 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 02:00:43,591 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 02:00:43,592 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 02:00:43,599 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-21 02:00:43,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 02:00:43,650 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 45 conjunts are in the unsatisfiable core [2021-11-21 02:00:43,653 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 02:00:44,669 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 59 proven. 35 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-11-21 02:00:44,669 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 02:00:46,850 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 02:00:46,850 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [613547260] [2021-11-21 02:00:46,851 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 02:00:46,851 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1796075067] [2021-11-21 02:00:46,851 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1796075067] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 02:00:46,851 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [595351066] [2021-11-21 02:00:46,853 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-21 02:00:46,853 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 02:00:46,853 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 02:00:46,854 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 02:00:46,854 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 02:00:54,018 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2021-11-21 02:00:54,018 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2021-11-21 02:00:54,018 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2021-11-21 02:00:54,019 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2021-11-21 02:00:55,324 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2021-11-21 02:00:55,324 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2021-11-21 02:00:55,325 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2021-11-21 02:00:55,325 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2021-11-21 02:01:01,445 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2021-11-21 02:01:01,446 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2021-11-21 02:01:01,825 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2021-11-21 02:01:01,826 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2021-11-21 02:01:05,072 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2021-11-21 02:01:05,073 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2021-11-21 02:01:05,073 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2021-11-21 02:01:05,073 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2021-11-21 02:01:06,420 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2021-11-21 02:01:06,420 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2021-11-21 02:01:06,421 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2021-11-21 02:01:06,421 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2021-11-21 02:01:12,888 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2021-11-21 02:01:12,889 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2021-11-21 02:01:13,333 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2021-11-21 02:01:13,333 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2021-11-21 02:01:17,636 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 17 for LOIs [2021-11-21 02:01:17,728 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 12 for LOIs [2021-11-21 02:01:17,739 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 02:01:26,630 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 02:01:26,630 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-21 02:01:26,630 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-11-21 02:01:26,630 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1171622438] [2021-11-21 02:01:26,630 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-21 02:01:26,631 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-21 02:01:26,631 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 02:01:26,631 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-21 02:01:26,632 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=1164, Unknown=1, NotChecked=0, Total=1332 [2021-11-21 02:01:26,632 INFO L87 Difference]: Start difference. First operand 165 states and 208 transitions. Second operand has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 10 states have internal predecessors, (23), 6 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 5 states have call predecessors, (17), 6 states have call successors, (17) [2021-11-21 02:01:27,345 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 02:01:27,345 INFO L93 Difference]: Finished difference Result 195 states and 247 transitions. [2021-11-21 02:01:27,347 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-21 02:01:27,347 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 10 states have internal predecessors, (23), 6 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 5 states have call predecessors, (17), 6 states have call successors, (17) Word has length 90 [2021-11-21 02:01:27,347 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 02:01:27,349 INFO L225 Difference]: With dead ends: 195 [2021-11-21 02:01:27,349 INFO L226 Difference]: Without dead ends: 193 [2021-11-21 02:01:27,351 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 222 GetRequests, 180 SyntacticMatches, 4 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 475 ImplicationChecksByTransitivity, 10.8s TimeCoverageRelationStatistics Valid=191, Invalid=1368, Unknown=1, NotChecked=0, Total=1560 [2021-11-21 02:01:27,351 INFO L933 BasicCegarLoop]: 37 mSDtfsCounter, 20 mSDsluCounter, 244 mSDsCounter, 0 mSdLazyCounter, 331 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 270 SdHoareTripleChecker+Invalid, 361 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 331 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-21 02:01:27,352 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 270 Invalid, 361 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 331 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-21 02:01:27,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2021-11-21 02:01:27,403 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 191. [2021-11-21 02:01:27,404 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 191 states, 111 states have (on average 1.135135135135135) internal successors, (126), 114 states have internal predecessors, (126), 59 states have call successors, (59), 20 states have call predecessors, (59), 20 states have return successors, (58), 56 states have call predecessors, (58), 58 states have call successors, (58) [2021-11-21 02:01:27,406 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 191 states to 191 states and 243 transitions. [2021-11-21 02:01:27,406 INFO L78 Accepts]: Start accepts. Automaton has 191 states and 243 transitions. Word has length 90 [2021-11-21 02:01:27,407 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 02:01:27,407 INFO L470 AbstractCegarLoop]: Abstraction has 191 states and 243 transitions. [2021-11-21 02:01:27,407 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 10 states have internal predecessors, (23), 6 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 5 states have call predecessors, (17), 6 states have call successors, (17) [2021-11-21 02:01:27,407 INFO L276 IsEmpty]: Start isEmpty. Operand 191 states and 243 transitions. [2021-11-21 02:01:27,409 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-11-21 02:01:27,410 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 02:01:27,410 INFO L514 BasicCegarLoop]: trace histogram [13, 12, 12, 6, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 02:01:27,439 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-21 02:01:27,624 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-21 02:01:27,624 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 02:01:27,624 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 02:01:27,624 INFO L85 PathProgramCache]: Analyzing trace with hash 2106799636, now seen corresponding path program 2 times [2021-11-21 02:01:27,624 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 02:01:27,625 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [254536543] [2021-11-21 02:01:27,625 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 02:01:27,625 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 02:01:27,631 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 02:01:27,631 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [57609279] [2021-11-21 02:01:27,631 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 02:01:27,631 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 02:01:27,631 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 02:01:27,645 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 02:01:27,646 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-21 02:01:27,684 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-21 02:01:27,685 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 02:01:27,685 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-21 02:01:27,687 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 02:01:27,846 INFO L134 CoverageAnalysis]: Checked inductivity of 343 backedges. 43 proven. 0 refuted. 0 times theorem prover too weak. 300 trivial. 0 not checked. [2021-11-21 02:01:27,846 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 02:01:27,846 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 02:01:27,846 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [254536543] [2021-11-21 02:01:27,847 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 02:01:27,847 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [57609279] [2021-11-21 02:01:27,847 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [57609279] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 02:01:27,847 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 02:01:27,847 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-21 02:01:27,847 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [739805967] [2021-11-21 02:01:27,848 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 02:01:27,848 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 02:01:27,848 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 02:01:27,848 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 02:01:27,849 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-21 02:01:27,849 INFO L87 Difference]: Start difference. First operand 191 states and 243 transitions. Second operand has 5 states, 5 states have (on average 4.6) internal successors, (23), 5 states have internal predecessors, (23), 3 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (14), 2 states have call predecessors, (14), 2 states have call successors, (14) [2021-11-21 02:01:27,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 02:01:27,942 INFO L93 Difference]: Finished difference Result 249 states and 313 transitions. [2021-11-21 02:01:27,944 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 02:01:27,944 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.6) internal successors, (23), 5 states have internal predecessors, (23), 3 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (14), 2 states have call predecessors, (14), 2 states have call successors, (14) Word has length 99 [2021-11-21 02:01:27,945 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 02:01:27,946 INFO L225 Difference]: With dead ends: 249 [2021-11-21 02:01:27,946 INFO L226 Difference]: Without dead ends: 185 [2021-11-21 02:01:27,947 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-21 02:01:27,948 INFO L933 BasicCegarLoop]: 47 mSDtfsCounter, 6 mSDsluCounter, 106 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 150 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 02:01:27,948 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 150 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 02:01:27,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185 states. [2021-11-21 02:01:27,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 185 to 184. [2021-11-21 02:01:27,985 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 184 states, 106 states have (on average 1.1132075471698113) internal successors, (118), 109 states have internal predecessors, (118), 57 states have call successors, (57), 20 states have call predecessors, (57), 20 states have return successors, (56), 54 states have call predecessors, (56), 56 states have call successors, (56) [2021-11-21 02:01:27,987 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 231 transitions. [2021-11-21 02:01:27,987 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 231 transitions. Word has length 99 [2021-11-21 02:01:27,987 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 02:01:27,988 INFO L470 AbstractCegarLoop]: Abstraction has 184 states and 231 transitions. [2021-11-21 02:01:27,988 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.6) internal successors, (23), 5 states have internal predecessors, (23), 3 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (14), 2 states have call predecessors, (14), 2 states have call successors, (14) [2021-11-21 02:01:27,988 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 231 transitions. [2021-11-21 02:01:27,989 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2021-11-21 02:01:27,989 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 02:01:27,989 INFO L514 BasicCegarLoop]: trace histogram [14, 13, 13, 6, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 02:01:28,009 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-21 02:01:28,190 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 02:01:28,190 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 02:01:28,190 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 02:01:28,190 INFO L85 PathProgramCache]: Analyzing trace with hash 173280102, now seen corresponding path program 2 times [2021-11-21 02:01:28,190 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 02:01:28,190 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [869992904] [2021-11-21 02:01:28,191 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 02:01:28,191 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 02:01:28,199 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 02:01:28,199 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [201450912] [2021-11-21 02:01:28,199 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 02:01:28,200 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 02:01:28,200 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 02:01:28,203 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 02:01:28,204 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-21 02:01:28,260 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-21 02:01:28,260 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 02:01:28,261 INFO L263 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-21 02:01:28,263 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 02:01:28,588 INFO L134 CoverageAnalysis]: Checked inductivity of 402 backedges. 57 proven. 35 refuted. 0 times theorem prover too weak. 310 trivial. 0 not checked. [2021-11-21 02:01:28,588 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 02:01:28,816 INFO L134 CoverageAnalysis]: Checked inductivity of 402 backedges. 73 proven. 7 refuted. 0 times theorem prover too weak. 322 trivial. 0 not checked. [2021-11-21 02:01:28,816 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 02:01:28,816 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [869992904] [2021-11-21 02:01:28,816 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 02:01:28,816 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [201450912] [2021-11-21 02:01:28,816 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [201450912] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 02:01:28,817 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2086682352] [2021-11-21 02:01:28,819 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-21 02:01:28,819 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 02:01:28,819 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 02:01:28,820 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 02:01:28,820 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 02:01:40,064 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 17 for LOIs [2021-11-21 02:01:40,130 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 12 for LOIs [2021-11-21 02:01:40,141 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 02:01:47,455 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 02:01:47,455 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 02:01:47,455 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 8] total 14 [2021-11-21 02:01:47,455 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1269389147] [2021-11-21 02:01:47,455 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 02:01:47,456 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-21 02:01:47,456 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 02:01:47,456 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-21 02:01:47,457 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=1047, Unknown=0, NotChecked=0, Total=1190 [2021-11-21 02:01:47,457 INFO L87 Difference]: Start difference. First operand 184 states and 231 transitions. Second operand has 14 states, 14 states have (on average 2.9285714285714284) internal successors, (41), 13 states have internal predecessors, (41), 8 states have call successors, (26), 2 states have call predecessors, (26), 2 states have return successors, (26), 8 states have call predecessors, (26), 8 states have call successors, (26) [2021-11-21 02:01:48,736 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 02:01:48,736 INFO L93 Difference]: Finished difference Result 230 states and 301 transitions. [2021-11-21 02:01:48,737 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-21 02:01:48,737 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.9285714285714284) internal successors, (41), 13 states have internal predecessors, (41), 8 states have call successors, (26), 2 states have call predecessors, (26), 2 states have return successors, (26), 8 states have call predecessors, (26), 8 states have call successors, (26) Word has length 105 [2021-11-21 02:01:48,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 02:01:48,739 INFO L225 Difference]: With dead ends: 230 [2021-11-21 02:01:48,739 INFO L226 Difference]: Without dead ends: 228 [2021-11-21 02:01:48,741 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 321 GetRequests, 275 SyntacticMatches, 5 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 496 ImplicationChecksByTransitivity, 8.1s TimeCoverageRelationStatistics Valid=205, Invalid=1601, Unknown=0, NotChecked=0, Total=1806 [2021-11-21 02:01:48,741 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 38 mSDsluCounter, 313 mSDsCounter, 0 mSdLazyCounter, 474 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 333 SdHoareTripleChecker+Invalid, 527 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 474 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-21 02:01:48,742 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 333 Invalid, 527 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 474 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-21 02:01:48,743 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 228 states. [2021-11-21 02:01:48,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 228 to 188. [2021-11-21 02:01:48,793 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 188 states, 109 states have (on average 1.110091743119266) internal successors, (121), 112 states have internal predecessors, (121), 57 states have call successors, (57), 21 states have call predecessors, (57), 21 states have return successors, (56), 54 states have call predecessors, (56), 56 states have call successors, (56) [2021-11-21 02:01:48,795 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 188 states to 188 states and 234 transitions. [2021-11-21 02:01:48,795 INFO L78 Accepts]: Start accepts. Automaton has 188 states and 234 transitions. Word has length 105 [2021-11-21 02:01:48,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 02:01:48,796 INFO L470 AbstractCegarLoop]: Abstraction has 188 states and 234 transitions. [2021-11-21 02:01:48,796 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.9285714285714284) internal successors, (41), 13 states have internal predecessors, (41), 8 states have call successors, (26), 2 states have call predecessors, (26), 2 states have return successors, (26), 8 states have call predecessors, (26), 8 states have call successors, (26) [2021-11-21 02:01:48,796 INFO L276 IsEmpty]: Start isEmpty. Operand 188 states and 234 transitions. [2021-11-21 02:01:48,797 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-11-21 02:01:48,797 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 02:01:48,798 INFO L514 BasicCegarLoop]: trace histogram [15, 14, 14, 6, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 02:01:48,823 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-21 02:01:49,001 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-21 02:01:49,002 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 02:01:49,002 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 02:01:49,002 INFO L85 PathProgramCache]: Analyzing trace with hash -425141716, now seen corresponding path program 3 times [2021-11-21 02:01:49,002 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 02:01:49,002 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1531312990] [2021-11-21 02:01:49,002 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 02:01:49,003 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 02:01:49,009 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 02:01:49,009 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1998353792] [2021-11-21 02:01:49,010 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 02:01:49,010 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 02:01:49,010 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 02:01:49,012 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 02:01:49,024 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-21 02:01:49,080 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 02:01:49,080 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 02:01:49,082 INFO L263 TraceCheckSpWp]: Trace formula consists of 230 conjuncts, 44 conjunts are in the unsatisfiable core [2021-11-21 02:01:49,085 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 02:01:50,063 INFO L134 CoverageAnalysis]: Checked inductivity of 454 backedges. 51 proven. 48 refuted. 0 times theorem prover too weak. 355 trivial. 0 not checked. [2021-11-21 02:01:50,063 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 02:01:57,859 INFO L134 CoverageAnalysis]: Checked inductivity of 454 backedges. 51 proven. 42 refuted. 6 times theorem prover too weak. 355 trivial. 0 not checked. [2021-11-21 02:01:57,860 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 02:01:57,860 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1531312990] [2021-11-21 02:01:57,860 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 02:01:57,860 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1998353792] [2021-11-21 02:01:57,860 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1998353792] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 02:01:57,861 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1052075766] [2021-11-21 02:01:57,862 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-21 02:01:57,862 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 02:01:57,862 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 02:01:57,863 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 02:01:57,863 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 02:02:18,560 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 17 for LOIs [2021-11-21 02:02:18,652 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 12 for LOIs [2021-11-21 02:02:18,671 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 02:02:34,709 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 02:02:34,709 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 02:02:34,709 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 22 [2021-11-21 02:02:34,709 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1465520738] [2021-11-21 02:02:34,710 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 02:02:34,710 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-21 02:02:34,710 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 02:02:34,711 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-21 02:02:34,712 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=217, Invalid=1586, Unknown=3, NotChecked=0, Total=1806 [2021-11-21 02:02:34,712 INFO L87 Difference]: Start difference. First operand 188 states and 234 transitions. Second operand has 22 states, 22 states have (on average 1.8181818181818181) internal successors, (40), 19 states have internal predecessors, (40), 13 states have call successors, (38), 2 states have call predecessors, (38), 2 states have return successors, (36), 11 states have call predecessors, (36), 13 states have call successors, (36) [2021-11-21 02:02:47,538 WARN L227 SmtUtils]: Spent 11.47s on a formula simplification that was a NOOP. DAG size: 77 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-21 02:03:15,027 WARN L227 SmtUtils]: Spent 24.96s on a formula simplification that was a NOOP. DAG size: 81 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-21 02:03:22,190 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 02:03:24,194 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 02:03:26,209 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 02:03:28,213 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 02:03:30,216 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 02:03:32,220 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 02:03:34,224 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 02:03:36,227 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 02:03:38,230 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 02:03:40,233 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 02:04:13,320 WARN L227 SmtUtils]: Spent 30.03s on a formula simplification that was a NOOP. DAG size: 75 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-21 02:04:15,328 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 02:05:40,606 WARN L227 SmtUtils]: Spent 1.41m on a formula simplification. DAG size of input: 83 DAG size of output: 82 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-21 02:05:54,395 WARN L227 SmtUtils]: Spent 12.18s on a formula simplification. DAG size of input: 66 DAG size of output: 65 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-21 02:05:57,103 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 02:05:59,105 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 02:06:03,378 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 02:06:21,794 WARN L227 SmtUtils]: Spent 17.97s on a formula simplification. DAG size of input: 70 DAG size of output: 69 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-21 02:06:23,807 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 02:06:29,655 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 02:06:31,657 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 02:06:33,545 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.89s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 02:06:53,719 WARN L227 SmtUtils]: Spent 20.01s on a formula simplification that was a NOOP. DAG size: 82 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-21 02:06:55,972 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 02:07:49,388 WARN L227 SmtUtils]: Spent 51.21s on a formula simplification that was a NOOP. DAG size: 80 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-21 02:07:57,538 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 02:07:59,540 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 02:08:01,543 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 02:08:14,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 02:08:14,087 INFO L93 Difference]: Finished difference Result 225 states and 282 transitions. [2021-11-21 02:08:14,088 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-21 02:08:14,088 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.8181818181818181) internal successors, (40), 19 states have internal predecessors, (40), 13 states have call successors, (38), 2 states have call predecessors, (38), 2 states have return successors, (36), 11 states have call predecessors, (36), 13 states have call successors, (36) Word has length 107 [2021-11-21 02:08:14,089 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 02:08:14,090 INFO L225 Difference]: With dead ends: 225 [2021-11-21 02:08:14,090 INFO L226 Difference]: Without dead ends: 223 [2021-11-21 02:08:14,091 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 339 GetRequests, 274 SyntacticMatches, 4 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1232 ImplicationChecksByTransitivity, 309.4s TimeCoverageRelationStatistics Valid=505, Invalid=3390, Unknown=11, NotChecked=0, Total=3906 [2021-11-21 02:08:14,092 INFO L933 BasicCegarLoop]: 44 mSDtfsCounter, 61 mSDsluCounter, 422 mSDsCounter, 0 mSdLazyCounter, 683 mSolverCounterSat, 161 mSolverCounterUnsat, 21 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 52.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 449 SdHoareTripleChecker+Invalid, 865 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 161 IncrementalHoareTripleChecker+Valid, 683 IncrementalHoareTripleChecker+Invalid, 21 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 53.0s IncrementalHoareTripleChecker+Time [2021-11-21 02:08:14,092 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [61 Valid, 449 Invalid, 865 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [161 Valid, 683 Invalid, 21 Unknown, 0 Unchecked, 53.0s Time] [2021-11-21 02:08:14,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 223 states. [2021-11-21 02:08:14,154 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 223 to 200. [2021-11-21 02:08:14,154 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 200 states, 118 states have (on average 1.1016949152542372) internal successors, (130), 121 states have internal predecessors, (130), 57 states have call successors, (57), 24 states have call predecessors, (57), 24 states have return successors, (56), 54 states have call predecessors, (56), 56 states have call successors, (56) [2021-11-21 02:08:14,156 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 200 states to 200 states and 243 transitions. [2021-11-21 02:08:14,156 INFO L78 Accepts]: Start accepts. Automaton has 200 states and 243 transitions. Word has length 107 [2021-11-21 02:08:14,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 02:08:14,157 INFO L470 AbstractCegarLoop]: Abstraction has 200 states and 243 transitions. [2021-11-21 02:08:14,157 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.8181818181818181) internal successors, (40), 19 states have internal predecessors, (40), 13 states have call successors, (38), 2 states have call predecessors, (38), 2 states have return successors, (36), 11 states have call predecessors, (36), 13 states have call successors, (36) [2021-11-21 02:08:14,157 INFO L276 IsEmpty]: Start isEmpty. Operand 200 states and 243 transitions. [2021-11-21 02:08:14,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-21 02:08:14,159 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 02:08:14,159 INFO L514 BasicCegarLoop]: trace histogram [16, 15, 15, 6, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 02:08:14,201 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-21 02:08:14,373 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-21 02:08:14,374 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 02:08:14,374 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 02:08:14,374 INFO L85 PathProgramCache]: Analyzing trace with hash 1680324149, now seen corresponding path program 4 times [2021-11-21 02:08:14,374 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 02:08:14,374 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1382544214] [2021-11-21 02:08:14,374 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 02:08:14,374 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 02:08:14,382 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 02:08:14,383 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [304221723] [2021-11-21 02:08:14,383 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 02:08:14,383 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 02:08:14,383 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 02:08:14,384 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 02:08:14,385 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7725c67d-55aa-4352-919d-020699e4d03c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-21 02:08:14,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 02:08:14,443 INFO L263 TraceCheckSpWp]: Trace formula consists of 284 conjuncts, 84 conjunts are in the unsatisfiable core [2021-11-21 02:08:14,446 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 02:08:16,307 INFO L134 CoverageAnalysis]: Checked inductivity of 515 backedges. 137 proven. 95 refuted. 0 times theorem prover too weak. 283 trivial. 0 not checked. [2021-11-21 02:08:16,307 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 02:08:53,025 WARN L227 SmtUtils]: Spent 33.14s on a formula simplification that was a NOOP. DAG size: 5 (called from [L1066] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2021-11-21 02:09:14,431 INFO L134 CoverageAnalysis]: Checked inductivity of 515 backedges. 146 proven. 51 refuted. 0 times theorem prover too weak. 318 trivial. 0 not checked. [2021-11-21 02:09:14,431 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 02:09:14,431 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1382544214] [2021-11-21 02:09:14,431 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 02:09:14,431 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [304221723] [2021-11-21 02:09:14,431 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [304221723] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 02:09:14,431 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [567038029] [2021-11-21 02:09:14,433 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-21 02:09:14,433 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 02:09:14,434 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 02:09:14,434 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 02:09:14,434 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 02:09:21,099 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2021-11-21 02:09:21,099 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2021-11-21 02:09:21,100 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2021-11-21 02:09:21,100 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2021-11-21 02:09:22,220 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2021-11-21 02:09:22,220 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2021-11-21 02:09:22,220 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2021-11-21 02:09:22,221 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2021-11-21 02:09:26,738 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2021-11-21 02:09:26,739 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2021-11-21 02:09:27,110 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2021-11-21 02:09:27,111 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2021-11-21 02:09:30,072 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2021-11-21 02:09:30,073 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2021-11-21 02:09:30,073 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2021-11-21 02:09:30,073 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2021-11-21 02:09:31,112 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2021-11-21 02:09:31,112 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2021-11-21 02:09:31,112 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2021-11-21 02:09:31,113 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2021-11-21 02:09:35,955 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2021-11-21 02:09:35,955 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2021-11-21 02:09:36,381 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2021-11-21 02:09:36,382 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2021-11-21 02:09:41,356 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 17 for LOIs [2021-11-21 02:09:41,442 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 12 for LOIs [2021-11-21 02:09:41,453 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 02:09:54,834 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 02:09:54,834 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 02:09:54,834 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 27 [2021-11-21 02:09:54,834 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [321712060] [2021-11-21 02:09:54,834 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 02:09:54,835 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-21 02:09:54,835 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 02:09:54,835 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-21 02:09:54,836 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=300, Invalid=1954, Unknown=2, NotChecked=0, Total=2256 [2021-11-21 02:09:54,836 INFO L87 Difference]: Start difference. First operand 200 states and 243 transitions. Second operand has 27 states, 22 states have (on average 1.8636363636363635) internal successors, (41), 19 states have internal predecessors, (41), 17 states have call successors, (41), 2 states have call predecessors, (41), 3 states have return successors, (40), 16 states have call predecessors, (40), 16 states have call successors, (40) [2021-11-21 02:09:57,261 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.69s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 02:10:04,376 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.20s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 02:10:10,476 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 02:10:19,285 WARN L227 SmtUtils]: Spent 7.91s on a formula simplification. DAG size of input: 80 DAG size of output: 79 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-21 02:10:23,513 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 02:10:30,829 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 02:10:39,262 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 02:10:42,540 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 02:10:47,413 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 02:11:01,165 WARN L227 SmtUtils]: Spent 9.90s on a formula simplification. DAG size of input: 92 DAG size of output: 79 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate)