./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/prodbin-ll_unwindbound20.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 0e0057cc Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/prodbin-ll_unwindbound20.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh --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 be4e75b70a907f4bb3fe11ead30460ebebe535afde280ea19731f48bb2dd2cd7 --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-12-02 19:55:28,469 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-12-02 19:55:28,546 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-12-02 19:55:28,551 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-12-02 19:55:28,551 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-12-02 19:55:28,589 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-12-02 19:55:28,589 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-12-02 19:55:28,590 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-12-02 19:55:28,590 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-12-02 19:55:28,591 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-12-02 19:55:28,592 INFO L153 SettingsManager]: * User list type=DISABLED [2023-12-02 19:55:28,592 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-12-02 19:55:28,593 INFO L153 SettingsManager]: * Explicit value domain=true [2023-12-02 19:55:28,593 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-12-02 19:55:28,594 INFO L153 SettingsManager]: * Octagon Domain=false [2023-12-02 19:55:28,594 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-12-02 19:55:28,595 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-12-02 19:55:28,595 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-12-02 19:55:28,596 INFO L153 SettingsManager]: * Interval Domain=false [2023-12-02 19:55:28,596 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-12-02 19:55:28,597 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-12-02 19:55:28,597 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-12-02 19:55:28,598 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-12-02 19:55:28,599 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-12-02 19:55:28,599 INFO L153 SettingsManager]: * sizeof long=4 [2023-12-02 19:55:28,600 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-12-02 19:55:28,600 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-12-02 19:55:28,601 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-12-02 19:55:28,601 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-12-02 19:55:28,602 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-12-02 19:55:28,602 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-12-02 19:55:28,603 INFO L153 SettingsManager]: * sizeof long double=12 [2023-12-02 19:55:28,603 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-12-02 19:55:28,603 INFO L153 SettingsManager]: * Use constant arrays=true [2023-12-02 19:55:28,604 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-12-02 19:55:28,604 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-12-02 19:55:28,604 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-12-02 19:55:28,604 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 19:55:28,604 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-12-02 19:55:28,604 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-12-02 19:55:28,605 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-12-02 19:55:28,605 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-12-02 19:55:28,605 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-12-02 19:55:28,605 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-12-02 19:55:28,606 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-12-02 19:55:28,606 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-12-02 19:55:28,606 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-12-02 19:55:28,606 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_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> be4e75b70a907f4bb3fe11ead30460ebebe535afde280ea19731f48bb2dd2cd7 [2023-12-02 19:55:28,841 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-12-02 19:55:28,864 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-12-02 19:55:28,867 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-12-02 19:55:28,869 INFO L270 PluginConnector]: Initializing CDTParser... [2023-12-02 19:55:28,869 INFO L274 PluginConnector]: CDTParser initialized [2023-12-02 19:55:28,871 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/../../sv-benchmarks/c/nla-digbench-scaling/prodbin-ll_unwindbound20.c [2023-12-02 19:55:31,570 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-12-02 19:55:31,777 INFO L384 CDTParser]: Found 1 translation units. [2023-12-02 19:55:31,777 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/sv-benchmarks/c/nla-digbench-scaling/prodbin-ll_unwindbound20.c [2023-12-02 19:55:31,785 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/data/6cc9e9d76/b77440abd1c44524ace707ac174af6a0/FLAGc733cead1 [2023-12-02 19:55:31,801 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/data/6cc9e9d76/b77440abd1c44524ace707ac174af6a0 [2023-12-02 19:55:31,804 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-12-02 19:55:31,805 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-12-02 19:55:31,807 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-12-02 19:55:31,807 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-12-02 19:55:31,813 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-12-02 19:55:31,813 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 07:55:31" (1/1) ... [2023-12-02 19:55:31,815 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3e49e9f5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:55:31, skipping insertion in model container [2023-12-02 19:55:31,815 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 07:55:31" (1/1) ... [2023-12-02 19:55:31,846 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-12-02 19:55:32,001 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_b00c5706-2fa7-4845-8d6b-d37cda05f32c/sv-benchmarks/c/nla-digbench-scaling/prodbin-ll_unwindbound20.c[1176,1189] [2023-12-02 19:55:32,017 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 19:55:32,028 INFO L202 MainTranslator]: Completed pre-run [2023-12-02 19:55:32,042 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_b00c5706-2fa7-4845-8d6b-d37cda05f32c/sv-benchmarks/c/nla-digbench-scaling/prodbin-ll_unwindbound20.c[1176,1189] [2023-12-02 19:55:32,047 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 19:55:32,063 INFO L206 MainTranslator]: Completed translation [2023-12-02 19:55:32,064 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:55:32 WrapperNode [2023-12-02 19:55:32,064 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-12-02 19:55:32,065 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-12-02 19:55:32,065 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-12-02 19:55:32,065 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-12-02 19:55:32,073 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:55:32" (1/1) ... [2023-12-02 19:55:32,080 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:55:32" (1/1) ... [2023-12-02 19:55:32,099 INFO L138 Inliner]: procedures = 14, calls = 10, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 49 [2023-12-02 19:55:32,099 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-12-02 19:55:32,100 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-12-02 19:55:32,100 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-12-02 19:55:32,100 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-12-02 19:55:32,109 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:55:32" (1/1) ... [2023-12-02 19:55:32,110 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:55:32" (1/1) ... [2023-12-02 19:55:32,111 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:55:32" (1/1) ... [2023-12-02 19:55:32,111 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:55:32" (1/1) ... [2023-12-02 19:55:32,114 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:55:32" (1/1) ... [2023-12-02 19:55:32,117 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:55:32" (1/1) ... [2023-12-02 19:55:32,119 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:55:32" (1/1) ... [2023-12-02 19:55:32,119 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:55:32" (1/1) ... [2023-12-02 19:55:32,121 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-12-02 19:55:32,122 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-12-02 19:55:32,122 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-12-02 19:55:32,122 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-12-02 19:55:32,123 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:55:32" (1/1) ... [2023-12-02 19:55:32,130 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 19:55:32,141 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:55:32,153 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-12-02 19:55:32,156 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-12-02 19:55:32,188 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-12-02 19:55:32,189 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-12-02 19:55:32,189 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-12-02 19:55:32,189 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-12-02 19:55:32,189 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-12-02 19:55:32,189 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-12-02 19:55:32,245 INFO L241 CfgBuilder]: Building ICFG [2023-12-02 19:55:32,247 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-12-02 19:55:32,399 INFO L282 CfgBuilder]: Performing block encoding [2023-12-02 19:55:32,458 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-12-02 19:55:32,459 INFO L309 CfgBuilder]: Removed 1 assume(true) statements. [2023-12-02 19:55:32,460 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 07:55:32 BoogieIcfgContainer [2023-12-02 19:55:32,460 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-12-02 19:55:32,463 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-12-02 19:55:32,463 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-12-02 19:55:32,466 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-12-02 19:55:32,466 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.12 07:55:31" (1/3) ... [2023-12-02 19:55:32,467 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@d70eab8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 07:55:32, skipping insertion in model container [2023-12-02 19:55:32,467 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:55:32" (2/3) ... [2023-12-02 19:55:32,467 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@d70eab8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 07:55:32, skipping insertion in model container [2023-12-02 19:55:32,468 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 07:55:32" (3/3) ... [2023-12-02 19:55:32,469 INFO L112 eAbstractionObserver]: Analyzing ICFG prodbin-ll_unwindbound20.c [2023-12-02 19:55:32,487 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-12-02 19:55:32,487 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-12-02 19:55:32,527 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-12-02 19:55:32,534 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;@58ec4f1a, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-12-02 19:55:32,535 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-12-02 19:55:32,539 INFO L276 IsEmpty]: Start isEmpty. Operand has 14 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 10 states have internal predecessors, (14), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-12-02 19:55:32,545 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-12-02 19:55:32,545 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:55:32,546 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-12-02 19:55:32,546 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:55:32,550 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:55:32,551 INFO L85 PathProgramCache]: Analyzing trace with hash -1628036165, now seen corresponding path program 1 times [2023-12-02 19:55:32,558 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:55:32,558 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1203070719] [2023-12-02 19:55:32,558 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:55:32,558 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:55:32,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:55:32,654 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:55:32,655 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1203070719] [2023-12-02 19:55:32,655 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unsupported non-linear arithmetic [2023-12-02 19:55:32,656 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [438346612] [2023-12-02 19:55:32,656 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:55:32,656 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:55:32,656 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:55:32,659 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:55:32,687 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-12-02 19:55:32,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:55:32,741 INFO L262 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 1 conjunts are in the unsatisfiable core [2023-12-02 19:55:32,745 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:55:32,765 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:55:32,765 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 19:55:32,766 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [438346612] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 19:55:32,766 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 19:55:32,766 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-12-02 19:55:32,768 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [793288376] [2023-12-02 19:55:32,769 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 19:55:32,773 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2023-12-02 19:55:32,774 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:55:32,802 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2023-12-02 19:55:32,802 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-12-02 19:55:32,805 INFO L87 Difference]: Start difference. First operand has 14 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 10 states have internal predecessors, (14), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) 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) [2023-12-02 19:55:32,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:55:32,834 INFO L93 Difference]: Finished difference Result 27 states and 37 transitions. [2023-12-02 19:55:32,835 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2023-12-02 19:55:32,836 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 [2023-12-02 19:55:32,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:55:32,843 INFO L225 Difference]: With dead ends: 27 [2023-12-02 19:55:32,843 INFO L226 Difference]: Without dead ends: 12 [2023-12-02 19:55:32,846 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 [2023-12-02 19:55:32,850 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 3 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 19:55:32,851 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 13 Invalid, 3 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 19:55:32,869 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2023-12-02 19:55:32,884 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2023-12-02 19:55:32,885 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 8 states have (on average 1.375) internal successors, (11), 9 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-12-02 19:55:32,886 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 14 transitions. [2023-12-02 19:55:32,887 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 14 transitions. Word has length 6 [2023-12-02 19:55:32,887 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:55:32,888 INFO L495 AbstractCegarLoop]: Abstraction has 12 states and 14 transitions. [2023-12-02 19:55:32,888 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) [2023-12-02 19:55:32,888 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 14 transitions. [2023-12-02 19:55:32,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-12-02 19:55:32,889 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:55:32,889 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:55:32,896 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-12-02 19:55:33,092 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:55:33,092 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:55:33,093 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:55:33,093 INFO L85 PathProgramCache]: Analyzing trace with hash 464117524, now seen corresponding path program 1 times [2023-12-02 19:55:33,093 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:55:33,093 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1232251841] [2023-12-02 19:55:33,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:55:33,094 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:55:33,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:55:33,122 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:55:33,123 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1232251841] [2023-12-02 19:55:33,123 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unsupported non-linear arithmetic [2023-12-02 19:55:33,123 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [602195635] [2023-12-02 19:55:33,124 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:55:33,124 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:55:33,124 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:55:33,125 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:55:33,137 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-12-02 19:55:33,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:55:33,188 INFO L262 TraceCheckSpWp]: Trace formula consists of 48 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 19:55:33,189 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:55:33,225 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:55:33,225 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 19:55:33,226 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [602195635] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 19:55:33,226 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 19:55:33,226 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 19:55:33,227 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [414208417] [2023-12-02 19:55:33,227 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 19:55:33,227 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 19:55:33,228 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:55:33,228 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 19:55:33,229 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 19:55:33,229 INFO L87 Difference]: Start difference. First operand 12 states and 14 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) [2023-12-02 19:55:33,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:55:33,248 INFO L93 Difference]: Finished difference Result 21 states and 23 transitions. [2023-12-02 19:55:33,249 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 19:55:33,249 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 [2023-12-02 19:55:33,249 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:55:33,250 INFO L225 Difference]: With dead ends: 21 [2023-12-02 19:55:33,250 INFO L226 Difference]: Without dead ends: 14 [2023-12-02 19:55:33,250 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 [2023-12-02 19:55:33,252 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 0 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 12 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 19:55:33,253 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 29 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 19:55:33,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2023-12-02 19:55:33,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2023-12-02 19:55:33,256 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 10 states have (on average 1.3) internal successors, (13), 11 states have internal predecessors, (13), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-12-02 19:55:33,256 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2023-12-02 19:55:33,256 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 7 [2023-12-02 19:55:33,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:55:33,257 INFO L495 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2023-12-02 19:55:33,257 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) [2023-12-02 19:55:33,257 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2023-12-02 19:55:33,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-12-02 19:55:33,258 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:55:33,258 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:55:33,262 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-12-02 19:55:33,458 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:55:33,459 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:55:33,459 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:55:33,459 INFO L85 PathProgramCache]: Analyzing trace with hash 465904984, now seen corresponding path program 1 times [2023-12-02 19:55:33,460 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:55:33,460 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [574871468] [2023-12-02 19:55:33,460 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:55:33,460 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:55:33,470 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 19:55:33,470 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [722016655] [2023-12-02 19:55:33,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:55:33,471 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:55:33,471 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:55:33,472 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:55:33,474 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-12-02 19:55:33,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:55:33,522 INFO L262 TraceCheckSpWp]: Trace formula consists of 48 conjuncts, 12 conjunts are in the unsatisfiable core [2023-12-02 19:55:33,524 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:55:33,591 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:55:33,591 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 19:55:33,591 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:55:33,592 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [574871468] [2023-12-02 19:55:33,592 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 19:55:33,592 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [722016655] [2023-12-02 19:55:33,592 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [722016655] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 19:55:33,592 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 19:55:33,593 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-12-02 19:55:33,593 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1995091559] [2023-12-02 19:55:33,593 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 19:55:33,593 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 19:55:33,594 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:55:33,594 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 19:55:33,595 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-12-02 19:55:33,595 INFO L87 Difference]: Start difference. First operand 14 states and 16 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) [2023-12-02 19:55:33,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:55:33,638 INFO L93 Difference]: Finished difference Result 23 states and 26 transitions. [2023-12-02 19:55:33,638 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-12-02 19:55:33,638 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 [2023-12-02 19:55:33,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:55:33,639 INFO L225 Difference]: With dead ends: 23 [2023-12-02 19:55:33,639 INFO L226 Difference]: Without dead ends: 21 [2023-12-02 19:55:33,640 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 [2023-12-02 19:55:33,641 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 6 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 19:55:33,642 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 31 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 19:55:33,643 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2023-12-02 19:55:33,647 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 19. [2023-12-02 19:55:33,648 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 15 states have internal predecessors, (16), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2023-12-02 19:55:33,648 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2023-12-02 19:55:33,649 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 7 [2023-12-02 19:55:33,649 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:55:33,649 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2023-12-02 19:55:33,649 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) [2023-12-02 19:55:33,649 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2023-12-02 19:55:33,650 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-12-02 19:55:33,650 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:55:33,650 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:55:33,656 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-12-02 19:55:33,855 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:55:33,856 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:55:33,856 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:55:33,856 INFO L85 PathProgramCache]: Analyzing trace with hash 1433201903, now seen corresponding path program 1 times [2023-12-02 19:55:33,857 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:55:33,857 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [33721521] [2023-12-02 19:55:33,857 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:55:33,857 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:55:33,868 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 19:55:33,869 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1855093177] [2023-12-02 19:55:33,869 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:55:33,869 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:55:33,869 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:55:33,870 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:55:33,871 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-12-02 19:55:33,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:55:33,914 INFO L262 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 19:55:33,916 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:55:33,931 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:55:33,931 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 19:55:33,931 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:55:33,932 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [33721521] [2023-12-02 19:55:33,932 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 19:55:33,932 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1855093177] [2023-12-02 19:55:33,932 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1855093177] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 19:55:33,932 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 19:55:33,933 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 19:55:33,933 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1922854191] [2023-12-02 19:55:33,933 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 19:55:33,933 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 19:55:33,934 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:55:33,935 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 19:55:33,935 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 19:55:33,935 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-12-02 19:55:33,946 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:55:33,946 INFO L93 Difference]: Finished difference Result 27 states and 29 transitions. [2023-12-02 19:55:33,947 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 19:55:33,947 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13 [2023-12-02 19:55:33,947 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:55:33,948 INFO L225 Difference]: With dead ends: 27 [2023-12-02 19:55:33,948 INFO L226 Difference]: Without dead ends: 20 [2023-12-02 19:55:33,948 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 19:55:33,949 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 4 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 19:55:33,950 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 23 Invalid, 4 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 19:55:33,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2023-12-02 19:55:33,954 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2023-12-02 19:55:33,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 15 states have internal predecessors, (17), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-12-02 19:55:33,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2023-12-02 19:55:33,956 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 13 [2023-12-02 19:55:33,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:55:33,956 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2023-12-02 19:55:33,956 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-12-02 19:55:33,956 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2023-12-02 19:55:33,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-12-02 19:55:33,957 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:55:33,957 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:55:33,962 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-12-02 19:55:34,159 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:55:34,160 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:55:34,161 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:55:34,161 INFO L85 PathProgramCache]: Analyzing trace with hash -516596709, now seen corresponding path program 1 times [2023-12-02 19:55:34,161 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:55:34,161 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [734327765] [2023-12-02 19:55:34,161 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:55:34,161 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:55:34,175 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 19:55:34,175 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2041191755] [2023-12-02 19:55:34,175 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:55:34,175 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:55:34,175 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:55:34,176 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:55:34,184 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-12-02 19:55:34,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:55:34,233 INFO L262 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 5 conjunts are in the unsatisfiable core [2023-12-02 19:55:34,235 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:55:34,268 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:55:34,268 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:55:34,309 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:55:34,310 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:55:34,310 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [734327765] [2023-12-02 19:55:34,320 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 19:55:34,320 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2041191755] [2023-12-02 19:55:34,320 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2041191755] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:55:34,321 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1011865408] [2023-12-02 19:55:34,340 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-12-02 19:55:34,340 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:55:34,344 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:55:34,349 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:55:34,350 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:55:36,237 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 97 for LOIs [2023-12-02 19:55:36,512 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:55:46,318 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '430#(and (<= 1 |#StackHeapBarrier|) (<= 1 ~counter~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 19:55:46,318 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:55:46,319 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 19:55:46,319 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5] total 8 [2023-12-02 19:55:46,319 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [170968019] [2023-12-02 19:55:46,319 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 19:55:46,319 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-12-02 19:55:46,320 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:55:46,320 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-12-02 19:55:46,321 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=225, Unknown=1, NotChecked=0, Total=272 [2023-12-02 19:55:46,321 INFO L87 Difference]: Start difference. First operand 20 states and 22 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) [2023-12-02 19:55:46,435 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:55:46,435 INFO L93 Difference]: Finished difference Result 51 states and 57 transitions. [2023-12-02 19:55:46,435 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-12-02 19:55:46,436 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 [2023-12-02 19:55:46,436 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:55:46,437 INFO L225 Difference]: With dead ends: 51 [2023-12-02 19:55:46,437 INFO L226 Difference]: Without dead ends: 44 [2023-12-02 19:55:46,437 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 9.9s TimeCoverageRelationStatistics Valid=66, Invalid=313, Unknown=1, NotChecked=0, Total=380 [2023-12-02 19:55:46,438 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 25 mSDsluCounter, 35 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 19:55:46,439 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 45 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 19:55:46,439 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2023-12-02 19:55:46,445 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 40. [2023-12-02 19:55:46,445 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 28 states have (on average 1.25) internal successors, (35), 31 states have internal predecessors, (35), 7 states have call successors, (7), 4 states have call predecessors, (7), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-12-02 19:55:46,446 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 46 transitions. [2023-12-02 19:55:46,446 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 46 transitions. Word has length 15 [2023-12-02 19:55:46,447 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:55:46,447 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 46 transitions. [2023-12-02 19:55:46,447 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) [2023-12-02 19:55:46,447 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 46 transitions. [2023-12-02 19:55:46,447 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-12-02 19:55:46,448 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:55:46,448 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:55:46,452 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-12-02 19:55:46,651 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:55:46,652 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:55:46,652 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:55:46,652 INFO L85 PathProgramCache]: Analyzing trace with hash -514809249, now seen corresponding path program 1 times [2023-12-02 19:55:46,652 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:55:46,652 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1092250535] [2023-12-02 19:55:46,653 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:55:46,653 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:55:46,662 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 19:55:46,663 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1002595248] [2023-12-02 19:55:46,663 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:55:46,663 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:55:46,663 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:55:46,664 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:55:46,669 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-12-02 19:55:46,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:55:46,708 INFO L262 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 23 conjunts are in the unsatisfiable core [2023-12-02 19:55:46,710 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:55:48,107 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:55:48,108 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:55:54,412 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:55:54,412 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:55:54,412 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1092250535] [2023-12-02 19:55:54,412 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 19:55:54,412 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1002595248] [2023-12-02 19:55:54,412 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1002595248] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:55:54,413 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [405733936] [2023-12-02 19:55:54,415 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-12-02 19:55:54,415 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:55:54,415 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:55:54,415 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:55:54,415 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:55:55,366 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 36 for LOIs [2023-12-02 19:55:55,416 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:56:04,635 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '667#(and (<= 1 |#StackHeapBarrier|) (<= 1 ~counter~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 19:56:04,635 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:56:04,635 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 19:56:04,636 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 13 [2023-12-02 19:56:04,636 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2004555389] [2023-12-02 19:56:04,636 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 19:56:04,636 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-12-02 19:56:04,636 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:56:04,637 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-12-02 19:56:04,637 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=350, Unknown=1, NotChecked=0, Total=420 [2023-12-02 19:56:04,637 INFO L87 Difference]: Start difference. First operand 40 states and 46 transitions. Second operand has 13 states, 13 states have (on average 1.6923076923076923) 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) [2023-12-02 19:56:07,464 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 19:56:11,549 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.40s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 19:56:20,070 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:56:20,070 INFO L93 Difference]: Finished difference Result 56 states and 62 transitions. [2023-12-02 19:56:20,070 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-12-02 19:56:20,070 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.6923076923076923) 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 [2023-12-02 19:56:20,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:56:20,073 INFO L225 Difference]: With dead ends: 56 [2023-12-02 19:56:20,073 INFO L226 Difference]: Without dead ends: 50 [2023-12-02 19:56:20,073 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 25.4s TimeCoverageRelationStatistics Valid=98, Invalid=497, Unknown=5, NotChecked=0, Total=600 [2023-12-02 19:56:20,074 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 23 mSDsluCounter, 53 mSDsCounter, 0 mSdLazyCounter, 74 mSolverCounterSat, 11 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 66 SdHoareTripleChecker+Invalid, 86 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 74 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.3s IncrementalHoareTripleChecker+Time [2023-12-02 19:56:20,074 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 66 Invalid, 86 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 74 Invalid, 1 Unknown, 0 Unchecked, 4.3s Time] [2023-12-02 19:56:20,075 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2023-12-02 19:56:20,083 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 46. [2023-12-02 19:56:20,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 33 states have (on average 1.1515151515151516) internal successors, (38), 35 states have internal predecessors, (38), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2023-12-02 19:56:20,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2023-12-02 19:56:20,084 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 15 [2023-12-02 19:56:20,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:56:20,085 INFO L495 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2023-12-02 19:56:20,085 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.6923076923076923) 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) [2023-12-02 19:56:20,085 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2023-12-02 19:56:20,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-12-02 19:56:20,085 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:56:20,085 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2023-12-02 19:56:20,089 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-12-02 19:56:20,286 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:56:20,286 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:56:20,286 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:56:20,286 INFO L85 PathProgramCache]: Analyzing trace with hash 1676822710, now seen corresponding path program 1 times [2023-12-02 19:56:20,286 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:56:20,286 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [853921297] [2023-12-02 19:56:20,287 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:56:20,287 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:56:20,295 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 19:56:20,295 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [956912720] [2023-12-02 19:56:20,295 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:56:20,295 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:56:20,295 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:56:20,296 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:56:20,296 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-12-02 19:56:20,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:56:20,332 INFO L262 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 13 conjunts are in the unsatisfiable core [2023-12-02 19:56:20,334 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:56:20,419 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 7 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-12-02 19:56:20,420 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:56:20,532 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 7 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-12-02 19:56:20,532 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:56:20,532 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [853921297] [2023-12-02 19:56:20,532 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 19:56:20,533 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [956912720] [2023-12-02 19:56:20,533 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [956912720] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:56:20,533 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1212480359] [2023-12-02 19:56:20,535 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-12-02 19:56:20,535 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:56:20,535 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:56:20,535 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:56:20,535 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:56:21,355 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 38 for LOIs [2023-12-02 19:56:21,394 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:56:28,543 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '955#(and (<= 1 |#StackHeapBarrier|) (<= 1 ~counter~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 19:56:28,543 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:56:28,544 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 19:56:28,544 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 11 [2023-12-02 19:56:28,544 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1635590991] [2023-12-02 19:56:28,544 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 19:56:28,545 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-12-02 19:56:28,545 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:56:28,545 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-12-02 19:56:28,546 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=311, Unknown=0, NotChecked=0, Total=380 [2023-12-02 19:56:28,546 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand has 11 states, 10 states have (on average 1.9) internal successors, (19), 8 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 1 states have call successors, (3) [2023-12-02 19:56:28,697 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:56:28,698 INFO L93 Difference]: Finished difference Result 53 states and 56 transitions. [2023-12-02 19:56:28,698 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-12-02 19:56:28,698 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 1.9) internal successors, (19), 8 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 1 states have call successors, (3) Word has length 21 [2023-12-02 19:56:28,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:56:28,699 INFO L225 Difference]: With dead ends: 53 [2023-12-02 19:56:28,699 INFO L226 Difference]: Without dead ends: 43 [2023-12-02 19:56:28,700 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 93 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=86, Invalid=376, Unknown=0, NotChecked=0, Total=462 [2023-12-02 19:56:28,701 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 14 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 57 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 60 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 57 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 19:56:28,701 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 48 Invalid, 60 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 57 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 19:56:28,702 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2023-12-02 19:56:28,710 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2023-12-02 19:56:28,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 31 states have (on average 1.064516129032258) internal successors, (33), 33 states have internal predecessors, (33), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2023-12-02 19:56:28,712 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2023-12-02 19:56:28,712 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 21 [2023-12-02 19:56:28,712 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:56:28,712 INFO L495 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2023-12-02 19:56:28,712 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 1.9) internal successors, (19), 8 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 1 states have call successors, (3) [2023-12-02 19:56:28,713 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2023-12-02 19:56:28,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2023-12-02 19:56:28,714 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:56:28,714 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1] [2023-12-02 19:56:28,719 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2023-12-02 19:56:28,915 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:56:28,915 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:56:28,916 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:56:28,916 INFO L85 PathProgramCache]: Analyzing trace with hash -1595930320, now seen corresponding path program 2 times [2023-12-02 19:56:28,916 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:56:28,916 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [888449723] [2023-12-02 19:56:28,916 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:56:28,916 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:56:28,928 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 19:56:28,928 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [153922640] [2023-12-02 19:56:28,928 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 19:56:28,929 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:56:28,929 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:56:28,930 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:56:28,931 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-12-02 19:56:29,007 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2023-12-02 19:56:29,007 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 19:56:29,008 INFO L262 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 11 conjunts are in the unsatisfiable core [2023-12-02 19:56:29,011 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:56:29,137 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 8 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:56:29,137 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:56:29,294 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 8 proven. 32 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-12-02 19:56:29,294 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:56:29,295 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [888449723] [2023-12-02 19:56:29,295 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 19:56:29,295 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [153922640] [2023-12-02 19:56:29,295 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [153922640] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:56:29,295 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [179989816] [2023-12-02 19:56:29,297 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-12-02 19:56:29,297 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:56:29,297 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:56:29,297 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:56:29,297 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:56:30,336 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 95 for LOIs [2023-12-02 19:56:30,519 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:56:38,723 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1342#(and (<= 1 |#StackHeapBarrier|) (<= 1 ~counter~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 19:56:38,724 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:56:38,724 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 19:56:38,724 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8] total 14 [2023-12-02 19:56:38,724 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1762118452] [2023-12-02 19:56:38,724 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 19:56:38,725 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-12-02 19:56:38,725 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:56:38,725 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-12-02 19:56:38,726 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=408, Unknown=0, NotChecked=0, Total=506 [2023-12-02 19:56:38,726 INFO L87 Difference]: Start difference. First operand 43 states and 44 transitions. Second operand has 14 states, 14 states have (on average 3.4285714285714284) internal successors, (48), 14 states have internal predecessors, (48), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2023-12-02 19:56:39,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:56:39,096 INFO L93 Difference]: Finished difference Result 103 states and 109 transitions. [2023-12-02 19:56:39,096 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2023-12-02 19:56:39,096 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.4285714285714284) internal successors, (48), 14 states have internal predecessors, (48), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) Word has length 39 [2023-12-02 19:56:39,097 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:56:39,097 INFO L225 Difference]: With dead ends: 103 [2023-12-02 19:56:39,097 INFO L226 Difference]: Without dead ends: 96 [2023-12-02 19:56:39,098 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 232 ImplicationChecksByTransitivity, 8.6s TimeCoverageRelationStatistics Valid=211, Invalid=781, Unknown=0, NotChecked=0, Total=992 [2023-12-02 19:56:39,099 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 43 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 62 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 81 SdHoareTripleChecker+Invalid, 65 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 62 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 19:56:39,099 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [43 Valid, 81 Invalid, 65 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 62 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 19:56:39,099 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2023-12-02 19:56:39,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 86. [2023-12-02 19:56:39,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 64 states have (on average 1.109375) internal successors, (71), 65 states have internal predecessors, (71), 11 states have call successors, (11), 10 states have call predecessors, (11), 10 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2023-12-02 19:56:39,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 92 transitions. [2023-12-02 19:56:39,108 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 92 transitions. Word has length 39 [2023-12-02 19:56:39,108 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:56:39,108 INFO L495 AbstractCegarLoop]: Abstraction has 86 states and 92 transitions. [2023-12-02 19:56:39,108 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 3.4285714285714284) internal successors, (48), 14 states have internal predecessors, (48), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2023-12-02 19:56:39,108 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 92 transitions. [2023-12-02 19:56:39,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2023-12-02 19:56:39,109 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:56:39,109 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 4, 4, 1, 1, 1] [2023-12-02 19:56:39,114 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2023-12-02 19:56:39,310 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:56:39,310 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:56:39,310 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:56:39,311 INFO L85 PathProgramCache]: Analyzing trace with hash -1594142860, now seen corresponding path program 2 times [2023-12-02 19:56:39,311 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:56:39,311 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1080714560] [2023-12-02 19:56:39,311 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:56:39,311 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:56:39,318 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 19:56:39,318 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [51378398] [2023-12-02 19:56:39,319 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 19:56:39,319 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:56:39,319 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:56:39,320 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:56:39,321 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-12-02 19:56:39,392 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2023-12-02 19:56:39,392 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 19:56:39,394 INFO L262 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 32 conjunts are in the unsatisfiable core [2023-12-02 19:56:39,397 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:56:40,852 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 16 proven. 37 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-12-02 19:56:40,852 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:56:45,464 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:56:45,465 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1080714560] [2023-12-02 19:56:45,465 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 19:56:45,465 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [51378398] [2023-12-02 19:56:45,465 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [51378398] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:56:45,465 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [287348720] [2023-12-02 19:56:45,467 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-12-02 19:56:45,467 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:56:45,467 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:56:45,467 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:56:45,467 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:56:46,208 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 36 for LOIs [2023-12-02 19:56:46,235 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:56:57,351 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1778#(and (<= 1 |#StackHeapBarrier|) (<= 1 ~counter~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 19:56:57,352 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:56:57,352 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2023-12-02 19:56:57,352 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2023-12-02 19:56:57,352 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1414148348] [2023-12-02 19:56:57,352 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2023-12-02 19:56:57,353 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-12-02 19:56:57,353 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:56:57,353 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-12-02 19:56:57,354 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=469, Unknown=2, NotChecked=0, Total=552 [2023-12-02 19:56:57,354 INFO L87 Difference]: Start difference. First operand 86 states and 92 transitions. Second operand has 12 states, 12 states have (on average 2.0) internal successors, (24), 10 states have internal predecessors, (24), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-12-02 19:56:58,564 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:56:58,564 INFO L93 Difference]: Finished difference Result 88 states and 93 transitions. [2023-12-02 19:56:58,565 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-12-02 19:56:58,565 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.0) internal successors, (24), 10 states have internal predecessors, (24), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 39 [2023-12-02 19:56:58,565 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:56:58,566 INFO L225 Difference]: With dead ends: 88 [2023-12-02 19:56:58,566 INFO L226 Difference]: Without dead ends: 86 [2023-12-02 19:56:58,567 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 158 ImplicationChecksByTransitivity, 16.3s TimeCoverageRelationStatistics Valid=126, Invalid=684, Unknown=2, NotChecked=0, Total=812 [2023-12-02 19:56:58,568 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 18 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 64 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 19:56:58,568 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 64 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 59 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 19:56:58,569 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2023-12-02 19:56:58,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 86. [2023-12-02 19:56:58,582 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 64 states have (on average 1.09375) internal successors, (70), 65 states have internal predecessors, (70), 11 states have call successors, (11), 10 states have call predecessors, (11), 10 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2023-12-02 19:56:58,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 91 transitions. [2023-12-02 19:56:58,584 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 91 transitions. Word has length 39 [2023-12-02 19:56:58,584 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:56:58,584 INFO L495 AbstractCegarLoop]: Abstraction has 86 states and 91 transitions. [2023-12-02 19:56:58,584 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.0) internal successors, (24), 10 states have internal predecessors, (24), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-12-02 19:56:58,585 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 91 transitions. [2023-12-02 19:56:58,586 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2023-12-02 19:56:58,586 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:56:58,586 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 5, 5, 1, 1, 1] [2023-12-02 19:56:58,592 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2023-12-02 19:56:58,787 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:56:58,788 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:56:58,788 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:56:58,788 INFO L85 PathProgramCache]: Analyzing trace with hash 1111027835, now seen corresponding path program 3 times [2023-12-02 19:56:58,788 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:56:58,788 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [114044642] [2023-12-02 19:56:58,788 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:56:58,788 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:56:58,798 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 19:56:58,799 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1874628638] [2023-12-02 19:56:58,799 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 19:56:58,799 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:56:58,799 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:56:58,800 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:56:58,804 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-12-02 19:57:04,933 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 19:57:04,933 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 19:57:04,937 INFO L262 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 69 conjunts are in the unsatisfiable core [2023-12-02 19:57:04,942 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:57:33,059 WARN L293 SmtUtils]: Spent 8.17s on a formula simplification. DAG size of input: 73 DAG size of output: 63 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 19:58:16,800 WARN L293 SmtUtils]: Spent 38.44s on a formula simplification. DAG size of input: 130 DAG size of output: 63 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 19:59:42,060 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 5 proven. 60 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2023-12-02 19:59:42,060 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 20:00:05,539 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 20:00:05,539 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [114044642] [2023-12-02 20:00:05,540 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 20:00:05,540 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1874628638] [2023-12-02 20:00:05,540 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1874628638] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 20:00:05,540 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1582848918] [2023-12-02 20:00:05,541 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-12-02 20:00:05,541 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 20:00:05,541 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 20:00:05,541 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 20:00:05,541 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 20:00:06,174 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 36 for LOIs [2023-12-02 20:00:06,200 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 20:00:24,098 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2240#(and (<= 1 |#StackHeapBarrier|) (<= 1 ~counter~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 20:00:24,098 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 20:00:24,098 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2023-12-02 20:00:24,098 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2023-12-02 20:00:24,099 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1468662658] [2023-12-02 20:00:24,099 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2023-12-02 20:00:24,099 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-12-02 20:00:24,099 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 20:00:24,100 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-12-02 20:00:24,100 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=637, Unknown=12, NotChecked=0, Total=756 [2023-12-02 20:00:24,100 INFO L87 Difference]: Start difference. First operand 86 states and 91 transitions. Second operand has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 10 states have internal predecessors, (24), 6 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2023-12-02 20:00:25,953 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.35s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 20:00:27,955 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 20:00:29,957 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 20:00:32,131 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 20:00:34,166 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 20:00:36,174 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 20:00:38,183 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 20:00:40,185 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 20:00:42,188 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 20:00:44,585 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 20:00:46,589 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 20:00:48,592 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 20:00:49,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 20:00:49,106 INFO L93 Difference]: Finished difference Result 88 states and 92 transitions. [2023-12-02 20:00:49,106 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-12-02 20:00:49,106 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 10 states have internal predecessors, (24), 6 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Word has length 47 [2023-12-02 20:00:49,106 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 20:00:49,107 INFO L225 Difference]: With dead ends: 88 [2023-12-02 20:00:49,107 INFO L226 Difference]: Without dead ends: 86 [2023-12-02 20:00:49,108 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 80 SyntacticMatches, 3 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 137 ImplicationChecksByTransitivity, 95.3s TimeCoverageRelationStatistics Valid=124, Invalid=734, Unknown=12, NotChecked=0, Total=870 [2023-12-02 20:00:49,108 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 11 mSDsluCounter, 184 mSDsCounter, 0 mSdLazyCounter, 169 mSolverCounterSat, 2 mSolverCounterUnsat, 11 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 24.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 206 SdHoareTripleChecker+Invalid, 182 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 169 IncrementalHoareTripleChecker+Invalid, 11 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 24.6s IncrementalHoareTripleChecker+Time [2023-12-02 20:00:49,108 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 206 Invalid, 182 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 169 Invalid, 11 Unknown, 0 Unchecked, 24.6s Time] [2023-12-02 20:00:49,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2023-12-02 20:00:49,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 86. [2023-12-02 20:00:49,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 64 states have (on average 1.078125) internal successors, (69), 65 states have internal predecessors, (69), 11 states have call successors, (11), 10 states have call predecessors, (11), 10 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2023-12-02 20:00:49,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 90 transitions. [2023-12-02 20:00:49,127 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 90 transitions. Word has length 47 [2023-12-02 20:00:49,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 20:00:49,128 INFO L495 AbstractCegarLoop]: Abstraction has 86 states and 90 transitions. [2023-12-02 20:00:49,128 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 10 states have internal predecessors, (24), 6 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2023-12-02 20:00:49,128 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 90 transitions. [2023-12-02 20:00:49,129 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2023-12-02 20:00:49,129 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:00:49,129 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 7, 7, 6, 6, 6, 6, 1, 1, 1] [2023-12-02 20:00:49,135 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2023-12-02 20:00:49,330 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:00:49,330 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 20:00:49,330 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:00:49,330 INFO L85 PathProgramCache]: Analyzing trace with hash 1847892610, now seen corresponding path program 4 times [2023-12-02 20:00:49,330 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 20:00:49,331 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [711864464] [2023-12-02 20:00:49,331 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:00:49,331 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 20:00:49,340 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 20:00:49,340 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [28959250] [2023-12-02 20:00:49,341 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 20:00:49,341 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:00:49,341 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 20:00:49,342 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 20:00:49,342 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-12-02 20:00:59,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:00:59,915 INFO L262 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 78 conjunts are in the unsatisfiable core [2023-12-02 20:00:59,919 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 20:01:57,344 WARN L293 SmtUtils]: Spent 6.96s on a formula simplification. DAG size of input: 70 DAG size of output: 68 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 20:02:37,479 INFO L134 CoverageAnalysis]: Checked inductivity of 150 backedges. 6 proven. 84 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2023-12-02 20:02:37,479 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 20:03:06,754 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 20:03:06,754 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [711864464] [2023-12-02 20:03:06,754 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 20:03:06,754 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [28959250] [2023-12-02 20:03:06,755 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [28959250] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 20:03:06,755 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1806118335] [2023-12-02 20:03:06,756 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-12-02 20:03:06,756 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 20:03:06,756 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 20:03:06,757 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 20:03:06,757 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 20:03:07,369 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 36 for LOIs [2023-12-02 20:03:07,397 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 20:03:21,209 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2724#(and (<= 1 |#StackHeapBarrier|) (<= 1 ~counter~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 20:03:21,209 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 20:03:21,209 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2023-12-02 20:03:21,209 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2023-12-02 20:03:21,210 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [282149549] [2023-12-02 20:03:21,210 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2023-12-02 20:03:21,210 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-12-02 20:03:21,210 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 20:03:21,211 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-12-02 20:03:21,211 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=841, Unknown=15, NotChecked=0, Total=992 [2023-12-02 20:03:21,211 INFO L87 Difference]: Start difference. First operand 86 states and 90 transitions. Second operand has 17 states, 17 states have (on average 1.588235294117647) internal successors, (27), 11 states have internal predecessors, (27), 7 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-12-02 20:03:25,250 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 20:03:26,978 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.73s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 20:03:28,054 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.08s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 20:03:31,123 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 20:03:33,133 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 20:03:34,370 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.24s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 20:03:42,665 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.29s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 20:03:43,822 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.16s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 20:03:46,176 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 20:03:47,020 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 20:03:47,020 INFO L93 Difference]: Finished difference Result 88 states and 91 transitions. [2023-12-02 20:03:47,020 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-12-02 20:03:47,021 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.588235294117647) internal successors, (27), 11 states have internal predecessors, (27), 7 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Word has length 55 [2023-12-02 20:03:47,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 20:03:47,022 INFO L225 Difference]: With dead ends: 88 [2023-12-02 20:03:47,022 INFO L226 Difference]: Without dead ends: 86 [2023-12-02 20:03:47,023 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 94 SyntacticMatches, 1 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 191 ImplicationChecksByTransitivity, 86.1s TimeCoverageRelationStatistics Valid=162, Invalid=1011, Unknown=17, NotChecked=0, Total=1190 [2023-12-02 20:03:47,023 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 16 mSDsluCounter, 264 mSDsCounter, 0 mSdLazyCounter, 222 mSolverCounterSat, 15 mSolverCounterUnsat, 4 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 18.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 289 SdHoareTripleChecker+Invalid, 241 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 222 IncrementalHoareTripleChecker+Invalid, 4 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 18.4s IncrementalHoareTripleChecker+Time [2023-12-02 20:03:47,023 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 289 Invalid, 241 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 222 Invalid, 4 Unknown, 0 Unchecked, 18.4s Time] [2023-12-02 20:03:47,024 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2023-12-02 20:03:47,040 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 86. [2023-12-02 20:03:47,040 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 64 states have (on average 1.0625) internal successors, (68), 65 states have internal predecessors, (68), 11 states have call successors, (11), 10 states have call predecessors, (11), 10 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2023-12-02 20:03:47,041 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 89 transitions. [2023-12-02 20:03:47,041 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 89 transitions. Word has length 55 [2023-12-02 20:03:47,041 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 20:03:47,041 INFO L495 AbstractCegarLoop]: Abstraction has 86 states and 89 transitions. [2023-12-02 20:03:47,042 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.588235294117647) internal successors, (27), 11 states have internal predecessors, (27), 7 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-12-02 20:03:47,042 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 89 transitions. [2023-12-02 20:03:47,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2023-12-02 20:03:47,042 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:03:47,043 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 8, 8, 7, 7, 7, 7, 1, 1, 1] [2023-12-02 20:03:47,049 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2023-12-02 20:03:47,243 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:03:47,243 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 20:03:47,243 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:03:47,243 INFO L85 PathProgramCache]: Analyzing trace with hash -22721143, now seen corresponding path program 5 times [2023-12-02 20:03:47,244 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 20:03:47,244 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1309018596] [2023-12-02 20:03:47,244 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:03:47,244 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 20:03:47,254 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 20:03:47,254 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [599522723] [2023-12-02 20:03:47,254 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 20:03:47,255 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:03:47,255 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 20:03:47,256 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 20:03:47,258 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-12-02 20:03:47,448 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2023-12-02 20:03:47,449 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 20:03:47,450 INFO L262 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 43 conjunts are in the unsatisfiable core [2023-12-02 20:03:47,454 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 20:03:50,519 INFO L134 CoverageAnalysis]: Checked inductivity of 203 backedges. 42 proven. 107 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2023-12-02 20:03:50,519 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 20:04:03,735 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 20:04:03,735 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1309018596] [2023-12-02 20:04:03,735 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 20:04:03,735 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [599522723] [2023-12-02 20:04:03,735 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [599522723] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 20:04:03,735 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1938083124] [2023-12-02 20:04:03,737 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-12-02 20:04:03,737 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 20:04:03,737 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 20:04:03,737 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 20:04:03,737 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 20:04:04,369 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 36 for LOIs [2023-12-02 20:04:04,398 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 20:04:19,059 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3232#(and (<= 1 |#StackHeapBarrier|) (<= 1 ~counter~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 20:04:19,059 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 20:04:19,059 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2023-12-02 20:04:19,059 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2023-12-02 20:04:19,060 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1305124985] [2023-12-02 20:04:19,060 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2023-12-02 20:04:19,060 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2023-12-02 20:04:19,060 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 20:04:19,061 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2023-12-02 20:04:19,061 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=127, Invalid=739, Unknown=4, NotChecked=0, Total=870 [2023-12-02 20:04:19,061 INFO L87 Difference]: Start difference. First operand 86 states and 89 transitions. Second operand has 15 states, 15 states have (on average 2.2) internal successors, (33), 13 states have internal predecessors, (33), 8 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2023-12-02 20:04:41,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 20:04:41,927 INFO L93 Difference]: Finished difference Result 88 states and 90 transitions. [2023-12-02 20:04:41,928 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-12-02 20:04:41,928 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.2) internal successors, (33), 13 states have internal predecessors, (33), 8 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) Word has length 63 [2023-12-02 20:04:41,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 20:04:41,929 INFO L225 Difference]: With dead ends: 88 [2023-12-02 20:04:41,929 INFO L226 Difference]: Without dead ends: 86 [2023-12-02 20:04:41,930 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 113 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 302 ImplicationChecksByTransitivity, 45.1s TimeCoverageRelationStatistics Valid=241, Invalid=1237, Unknown=4, NotChecked=0, Total=1482 [2023-12-02 20:04:41,930 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 24 mSDsluCounter, 70 mSDsCounter, 0 mSdLazyCounter, 74 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 89 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 74 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2023-12-02 20:04:41,931 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 83 Invalid, 89 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 74 Invalid, 0 Unknown, 0 Unchecked, 2.6s Time] [2023-12-02 20:04:41,931 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2023-12-02 20:04:41,952 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 86. [2023-12-02 20:04:41,952 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 64 states have (on average 1.046875) internal successors, (67), 65 states have internal predecessors, (67), 11 states have call successors, (11), 10 states have call predecessors, (11), 10 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2023-12-02 20:04:41,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 88 transitions. [2023-12-02 20:04:41,952 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 88 transitions. Word has length 63 [2023-12-02 20:04:41,953 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 20:04:41,953 INFO L495 AbstractCegarLoop]: Abstraction has 86 states and 88 transitions. [2023-12-02 20:04:41,953 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.2) internal successors, (33), 13 states have internal predecessors, (33), 8 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2023-12-02 20:04:41,953 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 88 transitions. [2023-12-02 20:04:41,954 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2023-12-02 20:04:41,954 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:04:41,954 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 9, 9, 8, 8, 8, 8, 1, 1, 1] [2023-12-02 20:04:41,959 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2023-12-02 20:04:42,154 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:04:42,155 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 20:04:42,155 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:04:42,155 INFO L85 PathProgramCache]: Analyzing trace with hash -157152880, now seen corresponding path program 6 times [2023-12-02 20:04:42,155 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 20:04:42,155 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1389781584] [2023-12-02 20:04:42,155 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:04:42,155 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 20:04:42,166 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 20:04:42,166 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1137320027] [2023-12-02 20:04:42,166 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 20:04:42,166 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:04:42,166 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 20:04:42,167 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 20:04:42,168 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b00c5706-2fa7-4845-8d6b-d37cda05f32c/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process