./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/ps4-ll_unwindbound5.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version cf1a7837 Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06c800ad-41ca-4ff4-b5c9-dd4690af028e/bin/utaipan-verify-NcY6lQBIFX/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06c800ad-41ca-4ff4-b5c9-dd4690af028e/bin/utaipan-verify-NcY6lQBIFX/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06c800ad-41ca-4ff4-b5c9-dd4690af028e/bin/utaipan-verify-NcY6lQBIFX/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06c800ad-41ca-4ff4-b5c9-dd4690af028e/bin/utaipan-verify-NcY6lQBIFX/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/ps4-ll_unwindbound5.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06c800ad-41ca-4ff4-b5c9-dd4690af028e/bin/utaipan-verify-NcY6lQBIFX/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06c800ad-41ca-4ff4-b5c9-dd4690af028e/bin/utaipan-verify-NcY6lQBIFX --witnessprinter.witness.filename witness --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 d629f4eefc4b49512b7b1b628f28a13dcdca90b36cb521919e0cc9ad875c2764 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-cf1a783 [2023-11-12 01:02:36,723 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-12 01:02:36,800 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06c800ad-41ca-4ff4-b5c9-dd4690af028e/bin/utaipan-verify-NcY6lQBIFX/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-12 01:02:36,804 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-12 01:02:36,805 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-12 01:02:36,830 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-12 01:02:36,831 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-12 01:02:36,832 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-12 01:02:36,833 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-12 01:02:36,833 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-12 01:02:36,834 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-12 01:02:36,835 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-12 01:02:36,835 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-12 01:02:36,836 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-12 01:02:36,837 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-12 01:02:36,837 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-12 01:02:36,838 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-12 01:02:36,838 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-12 01:02:36,839 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-12 01:02:36,840 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-12 01:02:36,840 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-12 01:02:36,841 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-12 01:02:36,842 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-12 01:02:36,843 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-12 01:02:36,843 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-12 01:02:36,844 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-12 01:02:36,845 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-12 01:02:36,845 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-12 01:02:36,846 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-12 01:02:36,846 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-12 01:02:36,847 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-12 01:02:36,847 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-12 01:02:36,847 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-12 01:02:36,848 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-12 01:02:36,849 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-12 01:02:36,849 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-12 01:02:36,849 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-12 01:02:36,850 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-12 01:02:36,850 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-12 01:02:36,851 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-12 01:02:36,851 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-12 01:02:36,851 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-12 01:02:36,851 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-12 01:02:36,852 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-12 01:02:36,852 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-12 01:02:36,852 INFO L153 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_06c800ad-41ca-4ff4-b5c9-dd4690af028e/bin/utaipan-verify-NcY6lQBIFX/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06c800ad-41ca-4ff4-b5c9-dd4690af028e/bin/utaipan-verify-NcY6lQBIFX Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> d629f4eefc4b49512b7b1b628f28a13dcdca90b36cb521919e0cc9ad875c2764 [2023-11-12 01:02:37,146 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-12 01:02:37,166 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-12 01:02:37,169 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-12 01:02:37,170 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-12 01:02:37,171 INFO L274 PluginConnector]: CDTParser initialized [2023-11-12 01:02:37,172 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06c800ad-41ca-4ff4-b5c9-dd4690af028e/bin/utaipan-verify-NcY6lQBIFX/../../sv-benchmarks/c/nla-digbench-scaling/ps4-ll_unwindbound5.c [2023-11-12 01:02:40,294 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-12 01:02:40,529 INFO L384 CDTParser]: Found 1 translation units. [2023-11-12 01:02:40,530 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06c800ad-41ca-4ff4-b5c9-dd4690af028e/sv-benchmarks/c/nla-digbench-scaling/ps4-ll_unwindbound5.c [2023-11-12 01:02:40,539 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06c800ad-41ca-4ff4-b5c9-dd4690af028e/bin/utaipan-verify-NcY6lQBIFX/data/fe97c7ca9/270212a1a18f461abb887cd94c7fe8b7/FLAGcfdbcf78e [2023-11-12 01:02:40,566 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06c800ad-41ca-4ff4-b5c9-dd4690af028e/bin/utaipan-verify-NcY6lQBIFX/data/fe97c7ca9/270212a1a18f461abb887cd94c7fe8b7 [2023-11-12 01:02:40,574 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-12 01:02:40,577 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-12 01:02:40,581 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-12 01:02:40,581 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-12 01:02:40,587 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-12 01:02:40,590 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 01:02:40" (1/1) ... [2023-11-12 01:02:40,592 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@27b467ee and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 01:02:40, skipping insertion in model container [2023-11-12 01:02:40,592 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 01:02:40" (1/1) ... [2023-11-12 01:02:40,620 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-12 01:02:40,837 WARN L240 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_06c800ad-41ca-4ff4-b5c9-dd4690af028e/sv-benchmarks/c/nla-digbench-scaling/ps4-ll_unwindbound5.c[458,471] [2023-11-12 01:02:40,858 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-12 01:02:40,867 INFO L202 MainTranslator]: Completed pre-run [2023-11-12 01:02:40,881 WARN L240 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_06c800ad-41ca-4ff4-b5c9-dd4690af028e/sv-benchmarks/c/nla-digbench-scaling/ps4-ll_unwindbound5.c[458,471] [2023-11-12 01:02:40,888 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-12 01:02:40,905 INFO L206 MainTranslator]: Completed translation [2023-11-12 01:02:40,906 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 01:02:40 WrapperNode [2023-11-12 01:02:40,906 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-12 01:02:40,908 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-12 01:02:40,912 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-12 01:02:40,913 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-12 01:02:40,920 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 01:02:40" (1/1) ... [2023-11-12 01:02:40,927 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 01:02:40" (1/1) ... [2023-11-12 01:02:40,946 INFO L138 Inliner]: procedures = 14, calls = 10, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 39 [2023-11-12 01:02:40,946 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-12 01:02:40,947 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-12 01:02:40,947 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-12 01:02:40,947 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-12 01:02:40,956 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 01:02:40" (1/1) ... [2023-11-12 01:02:40,956 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 01:02:40" (1/1) ... [2023-11-12 01:02:40,958 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 01:02:40" (1/1) ... [2023-11-12 01:02:40,958 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 01:02:40" (1/1) ... [2023-11-12 01:02:40,961 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 01:02:40" (1/1) ... [2023-11-12 01:02:40,964 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 01:02:40" (1/1) ... [2023-11-12 01:02:40,965 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 01:02:40" (1/1) ... [2023-11-12 01:02:40,966 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 01:02:40" (1/1) ... [2023-11-12 01:02:40,967 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-12 01:02:40,968 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-12 01:02:40,969 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-12 01:02:40,969 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-12 01:02:40,970 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 01:02:40" (1/1) ... [2023-11-12 01:02:40,976 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-12 01:02:40,992 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06c800ad-41ca-4ff4-b5c9-dd4690af028e/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 01:02:41,009 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06c800ad-41ca-4ff4-b5c9-dd4690af028e/bin/utaipan-verify-NcY6lQBIFX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-12 01:02:41,026 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06c800ad-41ca-4ff4-b5c9-dd4690af028e/bin/utaipan-verify-NcY6lQBIFX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-12 01:02:41,055 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-12 01:02:41,056 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-12 01:02:41,056 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-12 01:02:41,056 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-12 01:02:41,056 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-11-12 01:02:41,056 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-11-12 01:02:41,135 INFO L236 CfgBuilder]: Building ICFG [2023-11-12 01:02:41,138 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-12 01:02:41,268 INFO L277 CfgBuilder]: Performing block encoding [2023-11-12 01:02:41,288 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-12 01:02:41,288 INFO L302 CfgBuilder]: Removed 1 assume(true) statements. [2023-11-12 01:02:41,291 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 01:02:41 BoogieIcfgContainer [2023-11-12 01:02:41,291 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-12 01:02:41,294 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-12 01:02:41,294 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-12 01:02:41,297 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-12 01:02:41,297 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 12.11 01:02:40" (1/3) ... [2023-11-12 01:02:41,298 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3b971b66 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 01:02:41, skipping insertion in model container [2023-11-12 01:02:41,298 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 01:02:40" (2/3) ... [2023-11-12 01:02:41,298 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3b971b66 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 01:02:41, skipping insertion in model container [2023-11-12 01:02:41,299 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 01:02:41" (3/3) ... [2023-11-12 01:02:41,300 INFO L112 eAbstractionObserver]: Analyzing ICFG ps4-ll_unwindbound5.c [2023-11-12 01:02:41,317 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-12 01:02:41,317 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-12 01:02:41,362 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-12 01:02:41,369 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopHeads, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@4e3dfead, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-12 01:02:41,369 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-12 01:02:41,381 INFO L276 IsEmpty]: Start isEmpty. Operand has 15 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 10 states have internal predecessors, (14), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-12 01:02:41,388 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-11-12 01:02:41,388 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 01:02:41,389 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-11-12 01:02:41,389 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 01:02:41,393 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 01:02:41,394 INFO L85 PathProgramCache]: Analyzing trace with hash -2070802916, now seen corresponding path program 1 times [2023-11-12 01:02:41,401 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 01:02:41,402 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [103850038] [2023-11-12 01:02:41,402 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 01:02:41,403 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 01:02:41,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 01:02:41,556 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 01:02:41,556 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [103850038] [2023-11-12 01:02:41,557 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unsupported non-linear arithmetic [2023-11-12 01:02:41,557 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [600538984] [2023-11-12 01:02:41,557 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 01:02:41,558 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 01:02:41,558 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06c800ad-41ca-4ff4-b5c9-dd4690af028e/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 01:02:41,564 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06c800ad-41ca-4ff4-b5c9-dd4690af028e/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 01:02:41,591 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06c800ad-41ca-4ff4-b5c9-dd4690af028e/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-12 01:02:41,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 01:02:41,674 INFO L262 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 1 conjunts are in the unsatisfiable core [2023-11-12 01:02:41,679 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 01:02:41,712 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 01:02:41,712 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-12 01:02:41,713 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [600538984] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 01:02:41,714 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 01:02:41,714 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-12 01:02:41,716 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1898868101] [2023-11-12 01:02:41,717 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 01:02:41,722 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2023-11-12 01:02:41,722 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 01:02:41,764 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2023-11-12 01:02:41,766 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-11-12 01:02:41,768 INFO L87 Difference]: Start difference. First operand has 15 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 10 states have internal predecessors, (14), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 2 states, 2 states have (on average 2.5) internal successors, (5), 2 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 01:02:41,815 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 01:02:41,815 INFO L93 Difference]: Finished difference Result 29 states and 42 transitions. [2023-11-12 01:02:41,816 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2023-11-12 01:02:41,818 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 2.5) internal successors, (5), 2 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2023-11-12 01:02:41,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 01:02:41,826 INFO L225 Difference]: With dead ends: 29 [2023-11-12 01:02:41,826 INFO L226 Difference]: Without dead ends: 13 [2023-11-12 01:02:41,830 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-11-12 01:02:41,835 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 2 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 2 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 2 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-12 01:02:41,838 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 16 Invalid, 2 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 2 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-12 01:02:41,857 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2023-11-12 01:02:41,874 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2023-11-12 01:02:41,876 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 8 states have (on average 1.375) internal successors, (11), 9 states have internal predecessors, (11), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-12 01:02:41,877 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 16 transitions. [2023-11-12 01:02:41,879 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 16 transitions. Word has length 6 [2023-11-12 01:02:41,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 01:02:41,879 INFO L495 AbstractCegarLoop]: Abstraction has 13 states and 16 transitions. [2023-11-12 01:02:41,880 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 2.5) internal successors, (5), 2 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 01:02:41,880 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 16 transitions. [2023-11-12 01:02:41,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-11-12 01:02:41,882 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 01:02:41,882 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-11-12 01:02:41,909 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06c800ad-41ca-4ff4-b5c9-dd4690af028e/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-12 01:02:42,089 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06c800ad-41ca-4ff4-b5c9-dd4690af028e/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2023-11-12 01:02:42,090 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 01:02:42,091 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 01:02:42,091 INFO L85 PathProgramCache]: Analyzing trace with hash -170804699, now seen corresponding path program 1 times [2023-11-12 01:02:42,091 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 01:02:42,091 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [940275616] [2023-11-12 01:02:42,092 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 01:02:42,092 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 01:02:42,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 01:02:42,139 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 01:02:42,140 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [940275616] [2023-11-12 01:02:42,140 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unsupported non-linear arithmetic [2023-11-12 01:02:42,141 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1927354386] [2023-11-12 01:02:42,142 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 01:02:42,143 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 01:02:42,143 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06c800ad-41ca-4ff4-b5c9-dd4690af028e/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 01:02:42,144 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06c800ad-41ca-4ff4-b5c9-dd4690af028e/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 01:02:42,170 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06c800ad-41ca-4ff4-b5c9-dd4690af028e/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-12 01:02:42,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 01:02:42,205 INFO L262 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-12 01:02:42,207 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 01:02:42,268 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 01:02:42,268 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-12 01:02:42,269 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1927354386] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 01:02:42,269 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 01:02:42,269 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-12 01:02:42,269 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [417768592] [2023-11-12 01:02:42,270 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 01:02:42,271 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-12 01:02:42,272 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 01:02:42,272 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-12 01:02:42,274 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-12 01:02:42,274 INFO L87 Difference]: Start difference. First operand 13 states and 16 transitions. Second operand has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 01:02:42,293 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 01:02:42,294 INFO L93 Difference]: Finished difference Result 23 states and 27 transitions. [2023-11-12 01:02:42,294 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-12 01:02:42,295 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2023-11-12 01:02:42,295 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 01:02:42,295 INFO L225 Difference]: With dead ends: 23 [2023-11-12 01:02:42,296 INFO L226 Difference]: Without dead ends: 15 [2023-11-12 01:02:42,296 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-12 01:02:42,298 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 0 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 9 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-12 01:02:42,299 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 38 Invalid, 9 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-12 01:02:42,300 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2023-11-12 01:02:42,303 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2023-11-12 01:02:42,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 10 states have (on average 1.3) internal successors, (13), 11 states have internal predecessors, (13), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-12 01:02:42,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 18 transitions. [2023-11-12 01:02:42,305 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 18 transitions. Word has length 7 [2023-11-12 01:02:42,305 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 01:02:42,306 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 18 transitions. [2023-11-12 01:02:42,310 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 01:02:42,310 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 18 transitions. [2023-11-12 01:02:42,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-11-12 01:02:42,311 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 01:02:42,311 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-11-12 01:02:42,322 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06c800ad-41ca-4ff4-b5c9-dd4690af028e/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-12 01:02:42,517 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06c800ad-41ca-4ff4-b5c9-dd4690af028e/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 01:02:42,517 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 01:02:42,518 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 01:02:42,519 INFO L85 PathProgramCache]: Analyzing trace with hash -169017239, now seen corresponding path program 1 times [2023-11-12 01:02:42,519 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 01:02:42,519 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1986938320] [2023-11-12 01:02:42,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 01:02:42,520 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 01:02:42,533 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-12 01:02:42,535 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [306491112] [2023-11-12 01:02:42,537 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 01:02:42,537 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 01:02:42,539 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06c800ad-41ca-4ff4-b5c9-dd4690af028e/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 01:02:42,541 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06c800ad-41ca-4ff4-b5c9-dd4690af028e/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 01:02:42,566 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06c800ad-41ca-4ff4-b5c9-dd4690af028e/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-12 01:02:42,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 01:02:42,605 INFO L262 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 10 conjunts are in the unsatisfiable core [2023-11-12 01:02:42,607 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 01:02:42,667 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 01:02:42,667 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-12 01:02:42,668 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 01:02:42,668 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1986938320] [2023-11-12 01:02:42,668 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-12 01:02:42,669 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [306491112] [2023-11-12 01:02:42,669 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [306491112] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 01:02:42,669 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 01:02:42,669 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-12 01:02:42,670 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1608341238] [2023-11-12 01:02:42,670 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 01:02:42,670 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-12 01:02:42,671 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 01:02:42,671 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-12 01:02:42,672 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-12 01:02:42,672 INFO L87 Difference]: Start difference. First operand 15 states and 18 transitions. Second operand has 5 states, 5 states have (on average 1.2) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 01:02:42,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 01:02:42,869 INFO L93 Difference]: Finished difference Result 25 states and 30 transitions. [2023-11-12 01:02:42,869 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-12 01:02:42,870 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.2) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2023-11-12 01:02:42,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 01:02:42,871 INFO L225 Difference]: With dead ends: 25 [2023-11-12 01:02:42,871 INFO L226 Difference]: Without dead ends: 21 [2023-11-12 01:02:42,872 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-11-12 01:02:42,874 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 6 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 26 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-12 01:02:42,876 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 45 Invalid, 26 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-12 01:02:42,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2023-11-12 01:02:42,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2023-11-12 01:02:42,883 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 15 states have internal predecessors, (17), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-12 01:02:42,884 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 24 transitions. [2023-11-12 01:02:42,884 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 24 transitions. Word has length 7 [2023-11-12 01:02:42,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 01:02:42,885 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 24 transitions. [2023-11-12 01:02:42,885 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.2) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 01:02:42,885 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 24 transitions. [2023-11-12 01:02:42,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-11-12 01:02:42,886 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 01:02:42,886 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 01:02:42,896 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06c800ad-41ca-4ff4-b5c9-dd4690af028e/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-11-12 01:02:43,087 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06c800ad-41ca-4ff4-b5c9-dd4690af028e/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 01:02:43,088 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 01:02:43,089 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 01:02:43,090 INFO L85 PathProgramCache]: Analyzing trace with hash 867499275, now seen corresponding path program 1 times [2023-11-12 01:02:43,090 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 01:02:43,090 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1775823124] [2023-11-12 01:02:43,090 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 01:02:43,091 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 01:02:43,109 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-12 01:02:43,110 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [721560062] [2023-11-12 01:02:43,110 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 01:02:43,110 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 01:02:43,110 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06c800ad-41ca-4ff4-b5c9-dd4690af028e/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 01:02:43,116 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06c800ad-41ca-4ff4-b5c9-dd4690af028e/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 01:02:43,117 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06c800ad-41ca-4ff4-b5c9-dd4690af028e/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-12 01:02:43,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 01:02:43,217 INFO L262 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-12 01:02:43,219 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 01:02:43,281 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 01:02:43,281 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 01:02:43,436 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 01:02:43,437 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 01:02:43,438 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1775823124] [2023-11-12 01:02:43,438 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-12 01:02:43,438 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [721560062] [2023-11-12 01:02:43,438 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [721560062] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 01:02:43,439 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2077317743] [2023-11-12 01:02:43,461 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-11-12 01:02:43,461 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 01:02:43,466 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 01:02:43,472 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 01:02:43,473 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 01:02:45,164 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 77 for LOIs [2023-11-12 01:02:45,436 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 01:02:46,709 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '348#(and (or (exists ((|v_ULTIMATE.start_main_~c~0#1_BEFORE_CALL_7| Int) (|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_8| Int) (|v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_7| Int) (|v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_8| Int)) (and (<= 0 |v_ULTIMATE.start_main_~c~0#1_BEFORE_CALL_7|) (<= 1 |#StackHeapBarrier|) (<= 0 |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_8|) (<= |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_7| 32767) (<= 1 ~counter~0) (<= 0 |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_8|) (<= 0 (+ |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_7| 32768)) (not (= (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_8| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_8|) (* |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_7| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_8|))))) (exists ((|v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_10| Int) (|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_11| Int) (|v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_11| Int) (|v_ULTIMATE.start_main_~c~0#1_BEFORE_CALL_10| Int)) (and (not (= (* |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_11| 4) (+ (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_11| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_11|) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_11| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_11| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_11| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_11|) (* (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_11| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_11| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_11|) 2)))) (exists ((|v_ULTIMATE.start_main_#t~post5#1_22| Int)) (and (<= 1 |#StackHeapBarrier|) (<= 0 (+ |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_10| 32768)) (<= |v_ULTIMATE.start_main_#t~post5#1_22| 4) (<= 1 ~counter~0) (<= 0 |v_ULTIMATE.start_main_#t~post5#1_22|) (<= |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_10| 32767) (<= 0 |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_11|) (<= 0 |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_11|) (<= 0 |v_ULTIMATE.start_main_~c~0#1_BEFORE_CALL_10|)))))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-11-12 01:02:46,709 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 01:02:46,710 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-12 01:02:46,710 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5] total 8 [2023-11-12 01:02:46,710 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [156767812] [2023-11-12 01:02:46,710 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-12 01:02:46,711 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-12 01:02:46,711 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 01:02:46,712 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-12 01:02:46,712 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=223, Unknown=0, NotChecked=0, Total=272 [2023-11-12 01:02:46,713 INFO L87 Difference]: Start difference. First operand 21 states and 24 transitions. Second operand has 8 states, 8 states have (on average 2.625) internal successors, (21), 8 states have internal predecessors, (21), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-12 01:02:46,850 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 01:02:46,850 INFO L93 Difference]: Finished difference Result 55 states and 65 transitions. [2023-11-12 01:02:46,851 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-12 01:02:46,851 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 8 states have internal predecessors, (21), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 15 [2023-11-12 01:02:46,851 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 01:02:46,853 INFO L225 Difference]: With dead ends: 55 [2023-11-12 01:02:46,855 INFO L226 Difference]: Without dead ends: 47 [2023-11-12 01:02:46,856 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=69, Invalid=311, Unknown=0, NotChecked=0, Total=380 [2023-11-12 01:02:46,859 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 29 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 69 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 01:02:46,864 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [29 Valid, 69 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 01:02:46,867 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2023-11-12 01:02:46,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 43. [2023-11-12 01:02:46,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 28 states have (on average 1.25) internal successors, (35), 31 states have internal predecessors, (35), 10 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2023-11-12 01:02:46,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 52 transitions. [2023-11-12 01:02:46,884 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 52 transitions. Word has length 15 [2023-11-12 01:02:46,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 01:02:46,885 INFO L495 AbstractCegarLoop]: Abstraction has 43 states and 52 transitions. [2023-11-12 01:02:46,885 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 8 states have internal predecessors, (21), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-12 01:02:46,886 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 52 transitions. [2023-11-12 01:02:46,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-11-12 01:02:46,887 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 01:02:46,887 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 01:02:46,898 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06c800ad-41ca-4ff4-b5c9-dd4690af028e/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-12 01:02:47,093 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06c800ad-41ca-4ff4-b5c9-dd4690af028e/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 01:02:47,093 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 01:02:47,094 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 01:02:47,094 INFO L85 PathProgramCache]: Analyzing trace with hash 869286735, now seen corresponding path program 1 times [2023-11-12 01:02:47,094 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 01:02:47,094 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2116915106] [2023-11-12 01:02:47,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 01:02:47,095 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 01:02:47,104 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-12 01:02:47,104 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [174889210] [2023-11-12 01:02:47,104 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 01:02:47,104 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 01:02:47,104 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06c800ad-41ca-4ff4-b5c9-dd4690af028e/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 01:02:47,111 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06c800ad-41ca-4ff4-b5c9-dd4690af028e/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 01:02:47,117 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06c800ad-41ca-4ff4-b5c9-dd4690af028e/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-12 01:02:47,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 01:02:47,164 INFO L262 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 19 conjunts are in the unsatisfiable core [2023-11-12 01:02:47,166 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 01:02:47,250 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 01:02:47,250 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 01:02:47,349 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 01:02:47,350 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 01:02:47,350 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2116915106] [2023-11-12 01:02:47,350 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-12 01:02:47,350 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [174889210] [2023-11-12 01:02:47,350 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [174889210] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 01:02:47,351 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1193552854] [2023-11-12 01:02:47,354 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-11-12 01:02:47,355 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 01:02:47,355 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 01:02:47,356 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 01:02:47,356 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 01:02:48,206 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 50 for LOIs [2023-11-12 01:02:48,297 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 01:02:49,069 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '597#(and (exists ((|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_23| Int) (|v_ULTIMATE.start_main_~c~0#1_BEFORE_CALL_19| Int) (|v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_23| Int) (|v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_19| Int)) (and (not (= (* |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_23| 4) (+ (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_23| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_23|) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_23| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_23| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_23| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_23|) (* 2 (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_23| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_23| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_23|))))) (exists ((|v_ULTIMATE.start_main_#t~post5#1_27| Int)) (and (<= 0 (+ |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_19| 32768)) (<= 1 |#StackHeapBarrier|) (<= |v_ULTIMATE.start_main_#t~post5#1_27| 4) (<= |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_19| 32767) (<= 0 |v_ULTIMATE.start_main_~c~0#1_BEFORE_CALL_19|) (<= 0 |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_23|) (<= 0 |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_23|) (<= 0 |v_ULTIMATE.start_main_#t~post5#1_27|) (<= 1 ~counter~0))))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-11-12 01:02:49,070 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 01:02:49,070 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-12 01:02:49,070 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6] total 11 [2023-11-12 01:02:49,070 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [456223924] [2023-11-12 01:02:49,070 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-12 01:02:49,071 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-11-12 01:02:49,071 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 01:02:49,071 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-11-12 01:02:49,072 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=281, Unknown=0, NotChecked=0, Total=342 [2023-11-12 01:02:49,072 INFO L87 Difference]: Start difference. First operand 43 states and 52 transitions. Second operand has 11 states, 11 states have (on average 2.0) internal successors, (22), 10 states have internal predecessors, (22), 4 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-12 01:02:49,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 01:02:49,191 INFO L93 Difference]: Finished difference Result 57 states and 65 transitions. [2023-11-12 01:02:49,192 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-12 01:02:49,192 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.0) internal successors, (22), 10 states have internal predecessors, (22), 4 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 15 [2023-11-12 01:02:49,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 01:02:49,193 INFO L225 Difference]: With dead ends: 57 [2023-11-12 01:02:49,194 INFO L226 Difference]: Without dead ends: 46 [2023-11-12 01:02:49,194 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=78, Invalid=342, Unknown=0, NotChecked=0, Total=420 [2023-11-12 01:02:49,195 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 19 mSDsluCounter, 41 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 53 SdHoareTripleChecker+Invalid, 54 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 01:02:49,196 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [22 Valid, 53 Invalid, 54 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 01:02:49,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2023-11-12 01:02:49,204 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 40. [2023-11-12 01:02:49,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 30 states have (on average 1.1333333333333333) internal successors, (34), 30 states have internal predecessors, (34), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-11-12 01:02:49,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 43 transitions. [2023-11-12 01:02:49,206 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 43 transitions. Word has length 15 [2023-11-12 01:02:49,206 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 01:02:49,206 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 43 transitions. [2023-11-12 01:02:49,207 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.0) internal successors, (22), 10 states have internal predecessors, (22), 4 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-12 01:02:49,207 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 43 transitions. [2023-11-12 01:02:49,208 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-11-12 01:02:49,208 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 01:02:49,208 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2023-11-12 01:02:49,217 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06c800ad-41ca-4ff4-b5c9-dd4690af028e/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-12 01:02:49,414 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06c800ad-41ca-4ff4-b5c9-dd4690af028e/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 01:02:49,414 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 01:02:49,415 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 01:02:49,415 INFO L85 PathProgramCache]: Analyzing trace with hash 24753612, now seen corresponding path program 1 times [2023-11-12 01:02:49,415 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 01:02:49,415 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [795632101] [2023-11-12 01:02:49,415 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 01:02:49,415 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 01:02:49,424 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-12 01:02:49,424 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [422394155] [2023-11-12 01:02:49,425 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 01:02:49,425 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 01:02:49,425 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06c800ad-41ca-4ff4-b5c9-dd4690af028e/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 01:02:49,426 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06c800ad-41ca-4ff4-b5c9-dd4690af028e/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 01:02:49,475 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06c800ad-41ca-4ff4-b5c9-dd4690af028e/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-12 01:02:49,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 01:02:49,507 INFO L262 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 29 conjunts are in the unsatisfiable core [2023-11-12 01:02:49,509 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 01:02:49,665 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-12 01:02:49,665 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 01:02:49,963 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-12 01:02:49,964 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 01:02:49,964 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [795632101] [2023-11-12 01:02:49,964 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-12 01:02:49,964 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [422394155] [2023-11-12 01:02:49,965 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [422394155] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 01:02:49,965 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [731879726] [2023-11-12 01:02:49,967 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-11-12 01:02:49,967 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 01:02:49,968 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 01:02:49,968 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 01:02:49,968 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 01:02:50,759 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 86 for LOIs [2023-11-12 01:02:51,041 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 01:02:52,612 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '879#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (or (exists ((|v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_37| Int) (|v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_32| Int) (|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_38| Int) (|v_ULTIMATE.start_main_~c~0#1_BEFORE_CALL_33| Int)) (and (exists ((|v_ULTIMATE.start_main_#t~post5#1_33| Int)) (and (<= 0 (+ |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_32| 32768)) (<= 1 |#StackHeapBarrier|) (<= 0 |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_38|) (<= |v_ULTIMATE.start_main_#t~post5#1_33| 4) (<= 1 ~counter~0) (<= |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_32| 32767) (<= 0 |v_ULTIMATE.start_main_~c~0#1_BEFORE_CALL_33|) (<= 0 |v_ULTIMATE.start_main_#t~post5#1_33|) (<= 0 |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_37|))) (not (= (+ (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_38| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_38|) (* 2 (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_38| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_38| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_38|)) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_38| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_38| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_38| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_38|)) (* |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_37| 4))))) (exists ((|v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_36| Int) (|v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_31| Int) (|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_37| Int) (|v_ULTIMATE.start_main_~c~0#1_BEFORE_CALL_32| Int)) (and (= (* |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_36| 4) (+ (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_37| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_37|) (* (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_37| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_37| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_37|) 2) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_37| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_37| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_37| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_37|))) (<= |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_31| |v_ULTIMATE.start_main_~c~0#1_BEFORE_CALL_32|) (not (= (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_37| |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_31|) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_37| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_37|))) (exists ((|v_ULTIMATE.start_main_#t~post5#1_33| Int)) (and (<= 1 |#StackHeapBarrier|) (<= |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_31| 32767) (<= 0 |v_ULTIMATE.start_main_~c~0#1_BEFORE_CALL_32|) (<= 0 (+ |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_31| 32768)) (<= |v_ULTIMATE.start_main_#t~post5#1_33| 4) (<= 1 ~counter~0) (<= 0 |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_37|) (<= 0 |v_ULTIMATE.start_main_#t~post5#1_33|)))))))' at error location [2023-11-12 01:02:52,613 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 01:02:52,613 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-12 01:02:52,613 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 16 [2023-11-12 01:02:52,613 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [819156392] [2023-11-12 01:02:52,614 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-12 01:02:52,614 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2023-11-12 01:02:52,614 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 01:02:52,616 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2023-11-12 01:02:52,618 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=514, Unknown=0, NotChecked=0, Total=600 [2023-11-12 01:02:52,618 INFO L87 Difference]: Start difference. First operand 40 states and 43 transitions. Second operand has 16 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 13 states have internal predecessors, (27), 6 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-11-12 01:02:52,934 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 01:02:52,934 INFO L93 Difference]: Finished difference Result 49 states and 53 transitions. [2023-11-12 01:02:52,935 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-11-12 01:02:52,935 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 13 states have internal predecessors, (27), 6 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 21 [2023-11-12 01:02:52,935 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 01:02:52,936 INFO L225 Difference]: With dead ends: 49 [2023-11-12 01:02:52,936 INFO L226 Difference]: Without dead ends: 42 [2023-11-12 01:02:52,937 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 169 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=137, Invalid=793, Unknown=0, NotChecked=0, Total=930 [2023-11-12 01:02:52,938 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 20 mSDsluCounter, 61 mSDsCounter, 0 mSdLazyCounter, 82 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 71 SdHoareTripleChecker+Invalid, 93 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 82 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 01:02:52,938 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 71 Invalid, 93 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 82 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 01:02:52,939 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2023-11-12 01:02:52,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2023-11-12 01:02:52,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 31 states have (on average 1.064516129032258) internal successors, (33), 31 states have internal predecessors, (33), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2023-11-12 01:02:52,954 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 44 transitions. [2023-11-12 01:02:52,954 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 44 transitions. Word has length 21 [2023-11-12 01:02:52,955 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 01:02:52,959 INFO L495 AbstractCegarLoop]: Abstraction has 42 states and 44 transitions. [2023-11-12 01:02:52,960 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 13 states have internal predecessors, (27), 6 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-11-12 01:02:52,960 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 44 transitions. [2023-11-12 01:02:52,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2023-11-12 01:02:52,962 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 01:02:52,962 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1] [2023-11-12 01:02:52,973 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06c800ad-41ca-4ff4-b5c9-dd4690af028e/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-12 01:02:53,167 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06c800ad-41ca-4ff4-b5c9-dd4690af028e/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 01:02:53,168 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 01:02:53,168 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 01:02:53,168 INFO L85 PathProgramCache]: Analyzing trace with hash -795795011, now seen corresponding path program 2 times [2023-11-12 01:02:53,169 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 01:02:53,169 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [768358062] [2023-11-12 01:02:53,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 01:02:53,169 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 01:02:53,179 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-12 01:02:53,179 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1436084191] [2023-11-12 01:02:53,180 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-12 01:02:53,180 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 01:02:53,180 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06c800ad-41ca-4ff4-b5c9-dd4690af028e/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 01:02:53,181 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06c800ad-41ca-4ff4-b5c9-dd4690af028e/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 01:02:53,192 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06c800ad-41ca-4ff4-b5c9-dd4690af028e/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-12 01:02:53,246 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2023-11-12 01:02:53,246 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 01:02:53,247 INFO L262 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 11 conjunts are in the unsatisfiable core [2023-11-12 01:02:53,249 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 01:02:53,344 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 8 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 01:02:53,344 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 01:02:53,415 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 8 proven. 32 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-11-12 01:02:53,416 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 01:02:53,416 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [768358062] [2023-11-12 01:02:53,416 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-12 01:02:53,416 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1436084191] [2023-11-12 01:02:53,416 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1436084191] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 01:02:53,416 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2131611582] [2023-11-12 01:02:53,418 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-11-12 01:02:53,419 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 01:02:53,419 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 01:02:53,419 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 01:02:53,419 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 01:02:54,036 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 77 for LOIs [2023-11-12 01:02:54,184 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 01:02:55,188 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1263#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (or (exists ((|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_45| Int) (|v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_44| Int) (|v_ULTIMATE.start_main_~c~0#1_BEFORE_CALL_40| Int) (|v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_39| Int)) (and (<= 1 |#StackHeapBarrier|) (<= 0 |v_ULTIMATE.start_main_~c~0#1_BEFORE_CALL_40|) (<= 0 (+ |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_39| 32768)) (<= |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_39| 32767) (<= 0 |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_44|) (<= 1 ~counter~0) (<= 0 |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_45|) (not (= (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_45| |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_39|) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_45| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_45|))))) (exists ((|v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_47| Int) (|v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_42| Int) (|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_48| Int) (|v_ULTIMATE.start_main_~c~0#1_BEFORE_CALL_43| Int)) (and (not (= (+ (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_48| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_48| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_48| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_48|) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_48| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_48|) (* 2 (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_48| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_48| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_48|))) (* |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_47| 4))) (exists ((|v_ULTIMATE.start_main_#t~post5#1_44| Int)) (and (<= 1 |#StackHeapBarrier|) (<= |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_42| 32767) (<= 0 (+ |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_42| 32768)) (<= 1 ~counter~0) (<= 0 |v_ULTIMATE.start_main_#t~post5#1_44|) (<= 0 |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_48|) (<= |v_ULTIMATE.start_main_#t~post5#1_44| 4) (<= 0 |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_47|) (<= 0 |v_ULTIMATE.start_main_~c~0#1_BEFORE_CALL_43|)))))))' at error location [2023-11-12 01:02:55,188 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 01:02:55,188 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-12 01:02:55,188 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8] total 8 [2023-11-12 01:02:55,188 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1707380024] [2023-11-12 01:02:55,189 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-12 01:02:55,189 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-12 01:02:55,189 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 01:02:55,190 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-12 01:02:55,190 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=220, Unknown=0, NotChecked=0, Total=272 [2023-11-12 01:02:55,190 INFO L87 Difference]: Start difference. First operand 42 states and 44 transitions. Second operand has 8 states, 8 states have (on average 4.125) internal successors, (33), 8 states have internal predecessors, (33), 5 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2023-11-12 01:02:55,326 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 01:02:55,326 INFO L93 Difference]: Finished difference Result 53 states and 54 transitions. [2023-11-12 01:02:55,327 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-11-12 01:02:55,327 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.125) internal successors, (33), 8 states have internal predecessors, (33), 5 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 39 [2023-11-12 01:02:55,327 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 01:02:55,328 INFO L225 Difference]: With dead ends: 53 [2023-11-12 01:02:55,328 INFO L226 Difference]: Without dead ends: 48 [2023-11-12 01:02:55,329 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 94 SyntacticMatches, 6 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=80, Invalid=340, Unknown=0, NotChecked=0, Total=420 [2023-11-12 01:02:55,330 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 0 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 01:02:55,330 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 48 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 01:02:55,331 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2023-11-12 01:02:55,339 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2023-11-12 01:02:55,340 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 36 states have (on average 1.0555555555555556) internal successors, (38), 36 states have internal predecessors, (38), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2023-11-12 01:02:55,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2023-11-12 01:02:55,341 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 39 [2023-11-12 01:02:55,341 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 01:02:55,341 INFO L495 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2023-11-12 01:02:55,342 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 4.125) internal successors, (33), 8 states have internal predecessors, (33), 5 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2023-11-12 01:02:55,342 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2023-11-12 01:02:55,343 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2023-11-12 01:02:55,343 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 01:02:55,343 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1] [2023-11-12 01:02:55,350 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06c800ad-41ca-4ff4-b5c9-dd4690af028e/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-12 01:02:55,549 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06c800ad-41ca-4ff4-b5c9-dd4690af028e/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-11-12 01:02:55,550 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 01:02:55,550 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 01:02:55,550 INFO L85 PathProgramCache]: Analyzing trace with hash -1312813826, now seen corresponding path program 2 times [2023-11-12 01:02:55,550 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 01:02:55,551 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1542333930] [2023-11-12 01:02:55,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 01:02:55,551 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 01:02:55,560 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-12 01:02:55,561 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [43908712] [2023-11-12 01:02:55,561 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-12 01:02:55,561 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 01:02:55,561 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06c800ad-41ca-4ff4-b5c9-dd4690af028e/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 01:02:55,562 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06c800ad-41ca-4ff4-b5c9-dd4690af028e/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 01:02:55,575 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06c800ad-41ca-4ff4-b5c9-dd4690af028e/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-12 01:02:55,638 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2023-11-12 01:02:55,638 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 01:02:55,640 INFO L262 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 32 conjunts are in the unsatisfiable core [2023-11-12 01:02:55,643 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 01:02:55,819 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 21 proven. 41 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2023-11-12 01:02:55,819 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 01:03:28,076 WARN L876 $PredicateComparison]: unable to prove that (or (not (= |c___VERIFIER_assert_#in~cond| 0)) (forall ((|v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_45| Int) (|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_55| Int)) (or (= (mod (+ (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_55| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_55| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_55| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_55| 3) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_55| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_55| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_55| 2) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_55| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_55| 3)) 4) 0) (= (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_55| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_55|) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_55| |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_45|))))) is different from true